Beechcraft Be350/350C

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(1)KING AIR 350/350C (Model B300/B300C) PRO LINE 21 PILOT TRAINING MANUAL “The best safety device in any aircraft is a well-trained crew.”™. KING AIR 350/350C (Model B300/B300C) PRO LINE 21 PILOT TRAINING MANUAL REVISION 0.2. REVISION 0.2 FlightSafety International, Inc. Marine Air Terminal, LaGuardia Airport Flushing, New York 11371 (718) 565-4100 www.FlightSafety.com.

(2) F O R T R A I N I N G P U R P O S E S O N LY. NOTICE The material contained in this training manual is based on information obtained from the aircraft manufacturer’s Pilot Manuals and Maintenance Manuals. It is to be used for familiarization and training purposes only. At the time of printing it contained then-current information. In the event of conflict between data provided herein and that in publications issued by the manufacturer or the FAA, that of the manufacturer or the FAA shall take precedence. We at FlightSafety want you to have the best training possible. We welcome any suggestions you might have for improving this manual or any other aspect of our training program.. F O R T R A I N I N G P U R P O S E S O N LY.

(3) Courses for the King Air 300/350C are taught at the following FlightSafety Learning Center:. FlightSafety International Wichita Hawker Beechcraft Learning Center 9720 E. Central Avenue Wichita, KS 67206 Phone: (316) 612-5300 Toll-Free: (800) 488-3747 Fax: (316) 612-5399. Copyright © 2011 by FlightSafety International, Inc. All rights reserved. Printed in the United States of America..

(4) INSERT LATEST REVISED PAGES, DESTROY SUPERSEDED PAGES LIST OF EFFECTIVE PAGES Dates of issue for original and changed pages are: Revision............... 0 .............. August 2008 Revision............... .01 ......... October 2009 Revision............... 0.2 .........February 2011. THIS PUBLICATION CONSISTS OF THE FOLLOWING: Page No.. *Revision No.. Cover ...................................................... 0.2 i – vi ........................................................ 0.2 1-i – 1-vi.................................................. 0.2 1-1 – 1-32 ............................................... 0.2 2-i – 2-iv.................................................. 0.2 2-1 – 2-32 ............................................... 0.2 3-i – 3-iv.................................................. 0.2 3-1 – 3-8 ................................................. 0.2 4-i – 4-iv.................................................. 0.2 4-1 – 4-12 ............................................... 0.2 5-i – 5-iv.................................................. 0.2 5-1 – 5-26 ............................................... 0.2 6-i – 6-ii................................................... 0.2 7-i – 7-iv.................................................. 0.2 7-1 – 7-54 ............................................. 0.2 8-i – 8-iv ............................................... 0.2 8-1 – 8-10 ............................................... 0.2 9-i – 9-iv.................................................. 0.2 9-1 – 9-10 ............................................... 0.2 10-i – 10-iv.............................................. 0.2 10-1 – 10-26 ........................................... 0.2 11-i – 11-iv.............................................. 0.2 11-1 – 11-24 ........................................... 0.2 12-i – 12-iv.............................................. 0.2 12-1 – 12-18 ........................................... 0.2. Page No.. *Revision No.. 13-i – 13-ii............................................... 0.2 14-i – 14-iv.............................................. 0.2 14-1 – 14-30 ........................................... 0.2 15-i – 15-iv.............................................. 0.2 15-1 – 15-10 ........................................... 0.2 16-i – 16-xii............................................. 0.2 16-1 – 16-122 ......................................... 0.2 16A-i – 16A-iv ......................................... 0.2 16A-1 – 16A-24 ...................................... 0.2 17-i – 17-iv.............................................. 0.2 17-1 – 17-12 ........................................... 0.2 18-i – 18-ii............................................... 0.2 19-i – 19-iv.............................................. 0.2 19-1 – 19-20 ........................................... 0.2 20-i – 20-iv.............................................. 0.2 20-1 – 20-10 ........................................... 0.2 21-i – 21-iv.............................................. 0.2 21-1 – 21-16 ........................................... 0.2 22-i – 22-iv.............................................. 0.2 22-1 – 22-8 ............................................. 0.2 WA-1 – WA-26........................................ 0.2 APPA-i – APPA-ii .................................... 0.2 APPA-1 – APPA-6................................... 0.2 APPB-1 – APPB-10 ............................... 0.2 ANN-1 – ANN-4 ..................................... 0.2. *Zero in this column indicates an original page..

(5) CONTENTS Chapter 1. AIRCRAFT GENERAL. Chapter 2. ELECTRICAL POWER SYSTEMS. Chapter 3. LIGHTING. Chapter 4. MASTER WARNING SYSTEM. Chapter 5. FUEL SYSTEM. Chapter 6. AUXILIARY POWER UNIT. Chapter 7. POWERPLANT. Chapter 8. FIRE PROTECTION. Chapter 9. PNEUMATICS. Chapter 10. ICE AND RAIN PROTECTION. Chapter 11. AIR CONDITIONING. Chapter 12. PRESSURIZATION. Chapter 13. HYDRAULIC POWER SYSTEMS. Chapter 14. LANDING GEAR AND BRAKES. Chapter 15. FLIGHT CONTROLS. Chapter 16. AVIONICS. Chapter 16A. WIDE AREA AUGMENTATION SYSTEM (WAAS). Chapter 17. OXYGEN. Chapter 18. MISCELLANEOUS SYSTEMS. Chapter 19. MANEUVERS AND PROCEDURES. Chapter 20. WEIGHT AND BALANCE. Chapter 21. FLIGHT PLANNING AND PERFORMANCE. Chapter 22. CREW RESOURCE MANAGEMENT. WALKAROUND APPENDIX A APPENDIX B ANNUNCIATOR PANELS.

(6) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. CHAPTER 1 AIRCRAFT GENERAL CONTENTS Page INTRODUCTION ............................................................................................................... 1-1 GENERAL ........................................................................................................................... 1-2 Configuration................................................................................................................. 1-5 Specifications ................................................................................................................. 1-6 DOORS.................................................................................................................................. 1-8 Airstair Entrance........................................................................................................... 1-8 Emergency Exits ......................................................................................................... 1-10 Cargo Door.................................................................................................................. 1-11 350C Airstair Entrance .............................................................................................. 1-11 FLIGHT DECK ................................................................................................................ 1-12 Seats.............................................................................................................................. 1-12 Instruments/Controls.................................................................................................. 1-13 CABIN FEATURES ......................................................................................................... 1-20 Seats.............................................................................................................................. 1-20 Toilet............................................................................................................................. 1-20 AC Power..................................................................................................................... 1-21 BAGGAGE COMPARTMENT ...................................................................................... 1-21 CONTROL SURFACES................................................................................................... 1-22 GENERAL OPERATING INFORMATION............................................................... 1-23 Preflight Inspection..................................................................................................... 1-23 Tiedown and Securing ................................................................................................ 1-23. FOR TRAINING PURPOSES ONLY. 1-i.

(7) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. Taxiing .......................................................................................................................... 1-24 Servicing Data ............................................................................................................. 1-26 LIMITATIONS................................................................................................................... 1-26 Airspeed Limitations.................................................................................................. 1-26 Weight Limits .............................................................................................................. 1-26 Maximum Operating Limits ...................................................................................... 1-28 Maximum Outside Air Temperature Limits............................................................ 1-28 General Limitations.................................................................................................... 1-28 Cracked or Shattered Windshield............................................................................. 1-28 Crack in Side Window (Cockpit or Cabin) ............................................................. 1-29 Miscellaneous Airspeeds............................................................................................ 1-29 QUESTIONS ...................................................................................................................... 1-31. 1-ii. FOR TRAINING PURPOSES ONLY.

(8) ILLUSTRATIONS Figure. Title. Page. 1-1. King Air 350........................................................................................................... 1-2. 1-2. Dual Aft Strakes.................................................................................................... 1-3. 1-3. King Air 350 General Arrangement ................................................................... 1-4. 1-4. King Air 350 Cabin Seating Arrangement......................................................... 1-5. 1-5. King Air 350 Dimensions ..................................................................................... 1-7. 1-6. Airstair Door ......................................................................................................... 1-8. 1-7. Door Lock .............................................................................................................. 1-8. 1-8. Plunger-Out/Plunger-In ........................................................................................ 1-9. 1-9. Visual Inspection Ports ......................................................................................... 1-9. 1-10. Emergency Exit .................................................................................................. 1-10. 1-11. Emergency Exit Placards ................................................................................... 1-10. 1-12. Overhead Light Control Panel .......................................................................... 1-14. 1-13. Glareshield ........................................................................................................... 1-14. 1-14. Left Instrument Panel......................................................................................... 1-15. 1-15. Right Instrument Panel ...................................................................................... 1-15. 1-16. Center Instrument Panel .................................................................................... 1-16. 1-17. Pilot Subpanels .................................................................................................... 1-17. 1-18. Copilot Subpanels ............................................................................................... 1-17. 1-19. Center Pedestal.................................................................................................... 1-18. 1-20. Circuit Breaker Panel—Right Console ............................................................ 1-19. 1-21. Fuel Control Panel—Left Console.................................................................... 1-19. 1-22. Passenger Seats.................................................................................................... 1-20. 1-23. Toilet Seat............................................................................................................. 1-20. FOR TRAINING PURPOSES ONLY. 1-iii. 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL.

(9) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. 1-24. Flight Control Locks........................................................................................... 1-22. 1-25. Preflight Inspection............................................................................................. 1-23. 1-26. Tiedowns............................................................................................................... 1-24. 1-27. Turn Radius and Danger Areas......................................................................... 1-25. 1-28. Service Data......................................................................................................... 1-27. 1-iv. FOR TRAINING PURPOSES ONLY.

(10) CHAPTER 1 AIRCRAFT GENERAL. INTRODUCTION This training manual provides a description of the major airframe and engine systems in the King Air 350 Pro Line 21 aircraft. Information on the cargo (350C) and extended range (350ER) models is also included. This manual is an instructional aid. Its material does not supersede, nor is it meant to substitute for, any of the manufacturer operating manuals. Changes in aircraft appearance or system operation are covered during academic training and subsequent revisions to this manual. This introductory chapter presents an overall view of the aircraft for familiarization. Information includes general specifications and limitations, cabin features, and general cockpit layout.. FOR TRAINING PURPOSES ONLY. 1-1. 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL.

(11) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. GENERAL The King Air 350 is a high performance pressurized twin-engine turboprop (Figure1-1). The aircraft is equipped for day or night IFR conditions and flight into known icing conditions in and out of small airports within operating limits stated in the Pilot Operating Handbook. FL 381, 383 and subsequent aircraft have the Pro Line 21 avionics package. In late 2 0 0 7, t h e 3 5 0 E R w a s c e r t i f i e d . I t h a s additional nacelle fuel tanks, heavy-weight l a n d i n g g e a r, a n d a m a x i m u m t a ke o ff w e i g h t i n c r e a s e. Th e 3 5 0 E R h a s a n extended range of 2,30 0 nm (4,260 km) and eight hour endurance. The structure is an all aluminum low-wing monoplane with fully cantilevered wings. and a T-tail empennage. The wings are an efficient, high-aspect ratio design. The airfoil provides an excellent combination of low drag for cruise conditions and easy handling for low speed terminal or small airport operations. The NASA-designed winglets further improve performance. All Pro Line 21 aircraft also include dual aft strakes (Figure1-2). The wing/body vortices normally disrupt airflow under the aft fuselage. This creates drag. The strakes eliminate this separation by channeling the vortices and accelerating the air. They are, in effect, pushing the aircraft through the air. The dual strakes eliminate or raise yaw damper limits to increase dispatch reliability. They permit flight with the yaw damper off until 19,0 0 0 ft.. Figure 1-1. King Air 350 (Sheet 1 of 2). 1-2. FOR TRAINING PURPOSES ONLY.

(12) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. The faired-oval nacelle on each side of the wing center section houses the engine and l a n d i n g g e a r. Th e n a c e l l e s m a x i m i z e propeller-to-ground clearance, minimize cabin noise, and provide a low drag installation of the powerplants on the wing. The pitot-type intakes and smaller frontal area of the exhaust stacks reduce drag to also boost performance. The distinctive T-tail provides improved aerodynamics, lighter control forces, and a w i d e r c e n t e r- o f - g ra v i t y ra n g e. M o d e l 350ER has an increased rudder area. The fuselage is a conventional monocoque structure with high strength aluminum alloys. The basic cross-sectional cabin is a favorable compromise between passenger comfort and efficient cruise performance. The squared-oval cabin allows passengers to sit comfortably. The floors are flat from side to side for passenger ease in entering and leaving the cabin (Figure 1-3).. Figure 1-2. Dual Aft Strakes. Figure 1-1. King Air 350 (Sheet 2 of 2). FOR TRAINING PURPOSES ONLY. 1-3.

(13) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. 12. 11 10 7 3. 9 8. 13. 6. 5 4. 2 14 15. 1. 3. 5. 16. 6. 19 23 21 20. 24. 18 22 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.. 17. Weather Radar Antenna Communications, Navigation and Radar Equipment Outboard Flap Section Ground Escape Hatch Inboard Flap Section Liquid Storage Cabinet Lavatory Privacy Curtain Belted Lavatory Pressurization Safety and Outflow Valves Oxygen Bottle Emergency Locator Transmitter Elevator Trim Tabs. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24.. Rudder Trim Tab Baggage Area Airstair Door Aileron Trim Tab Box Section Fuel Tanks Leading Edge Fuel Tanks Auxiliary Fuel Tank Wing Ice Check Light Nacelle Fuel Tank PT6A Turboprop Engine Heated Pitot Mast Landing and Taxi Lights. Figure 1-3. King Air 350 General Arrangement. 1-4. FOR TRAINING PURPOSES ONLY.

(14) CONFIGURATION The King Air 350 is certificated for up to 17 people (15 passengers and 2 crew), but normal corporate configuration is 9 to 11 (Figure 1-4).. In addition to the standard configurations, Beechcraft offers optional items that are available at additional cost and weight. Basic specifications are detailed below. Refer to the appropriate aircraft POH for detailed, up-to-date information.. Figure 1-4. King Air 350 Cabin Seating Arrangement. FOR TRAINING PURPOSES ONLY. 1-5. 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL.

(15) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. SPECIFICATIONS Crew—FAA Certificated ........................ 1 • Except where otherwise prescribed by the appropriate operating re g u l a t i o n s, o n e p i l o t w i t h FA A approved passenger seating configurations of nine or less; or one pilot and one copilot for all other approved configurations. Occupancy—Max. FAA Cert. (with crew) ................................................ 17. Airstair Entrance Door Height (Min) ............................ 51.5 inches Cargo Door Width ...................... 49 inches Cargo Door Height .................... 52 inches Pressure Vessel Volume ................................ 443 cubic feet Potential Cargo area volume ................................ 303 cubic feet. Specific Loadings. Passengers— Normal Configuration .................... 9 to 11. Wing Loading: 48.4 pounds per square foot. Engines—P & W Turboprop, 1050 SHP ................................ 2 PT6A-60A. Power Loading: 7.14 pounds per shaft horsepower.. Propellers—4 Blade, Reversible.................................... 2 Hartzell. Figure 1-5 illustrates the King Air 350 dimensions.. Landing Gear—Retractable, Tricycle, Dual Main Wheels .... Hydraulic Wing Area .................................... 310 sq. ft.. Cabin and Entry Dimensions Cabin Width (Max) .................... 54 inches Cabin Length (Max between pressure bulkheads) .................... 24 feet, 10 inches Cabin Height (Max) .................. 57 inches Airstair Entrance Door Width (Min) .......................... 26.75 inches. 1-6. FOR TRAINING PURPOSES ONLY.

(16) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. Figure 1-5. King Air 350 Dimensions. FOR TRAINING PURPOSES ONLY. 1-7.

(17) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. DOORS AIRSTAIR ENTRANCE The cabin entry airstair door is on the left side of the fuselage, just aft of the wing (Figure 1-6). The swing-down door, hinged a t t h e b o tt o m , p ro v i d e s a c o nv e n i e n t stairway for entry and exit. Two of the four steps are movable and automatically fold flat against the door in the closed position. A self-storing platform that automatically folds down over the doorsill when the door opens provides a stepping platform for door seal protection. A plastic encased cable supports the door in the open position. It also provides a handhold and a m e a n s t o c l o s e t h e d o o r f ro m i n s i d e. Additional handhold cable is available as an option.. A hydraulic damper permits the door to lower gradually. Because excessive weight could damage the door attach fitting, no more than one person should be on the airstair door at a time. The door can be locked with a key for security on the ground.. Airstair Locking Mechanism Either one of two vertically staggered handles, one inside and one outside, lock the d o o r . Th e h a n d l e s a r e m e c h a n i c a l l y interconnected. When either is rotated per placard instructions, two bayonet pins on each side of the door and two hooks at the top engage the door frame to secure the door.. Opening the Door A button next to the door handle must be depressed before the handle can be rotated to open the door. As an additional safety measure, a differential pressures e n s i t i v e d i a p h ra g m i s i n t h e re l e a s e button mechanism.. Securing the Door To secure the airstair door inside, rotate the handle clockwise as far as it will go. The release button should pop out. The handle should be pointing down (Figure 1-7).. Figure 1-7. Door Lock Figure 1-6. Airstair Door. 1-8. FOR TRAINING PURPOSES ONLY.

(18) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. Attempt to rotate the handle counterclockwise without depressing the release button to check security. The handle should not move. Next lift the folded airstep just below the door handle. Ensure that the safety lock is in position around the diaphragm shaft when the handle is in the locked position. To observe this area, depress a red switch near the window. This illuminates a lamp inside the door (Figure 1-8). If the arm is properly positioned around the shaft, proceed to check indication in each of the visual inspection ports near each corner of the door. Ensure the green stripe on the latch bolt is aligned with the black pointer in the visual inspection port (Figure 1-9).. Figure 1-9. Visual Inspection Ports. To check the upper door hook engagement, view the hooks through two inspection openings in the headliner just above the fore and aft upper corners. To illuminate the h o o k e n g a g e m e n t a r e a s, d e p r e s s t h e CABIN DOOR HOOK, OBSV LT SW button between the two inspection openings in the headliner.. PLUNGER-OUT. WARNING Never attempt to unlock or check the security of the door in flight. If the CABIN DOOR annunciator illuminates in flight, or if the pilot has any reason to suspect the door may not be securely locked, instruct all occupants to remain seated with seatbelts fastened. Re d u c e c a b i n p re s s u re t o t h e lowest practical value (considering altitude first). After the aircraft has made a full-stop landing, a crewmember should check the security of the airstair door. Perform the “Cabin Door Annunciator Circuitry Check” in the POH Normal Procedures section prior to the first flight of the day. If any condition specified in this procedure is not met, DO NOT TAKE OFF.. PLUNGER-IN. Figure 1-8. Plunger-Out/Plunger-In. FOR TRAINING PURPOSES ONLY. 1-9.

(19) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. EMERGENCY EXITS The emergency exits are on the left and right side of the fuselage at the forward ends of the passenger compartment (Figure 1-10). From inside, release the hatches with the EXIT-PULL pull-down handle. From the outside, a flush-mounted, pullout handle releases the hatches. The nonhinged, plugtype hatches can be removed completely from the frame into the cabin when the latches are released (Figure 1-11). The hatch can be locked so that it cannot be removed or opened from the outside. The hatch is locked when the lock lever inside is in the down or locked position.. When the aircraft is parked, lock the hatch for security. Prior to flight, the lock lever should be in the up or unlocked position to allow removal of the hatch from the outside in an emergency. Removal of the hatch from inside is possible at all times with the EXIT-PULL handle because it is not locked by the lock lever. An exit lock placard on the lock lever can be read when the lever is in the locked position.. EXIT-PULL. INSIDE EMERGENCY EXIT PUSH. 1. PULL HANDLE 2. PUSH IN AFTER RELEASE. OUTSIDE. Figure 1-10. Emergency Exit. 1-10. Figure 1-11. Emergency Exit Placards. FOR TRAINING PURPOSES ONLY.

(20) CARGO DOOR A large, swing-up cargo door is hinged at the top to provides access for loading large items. Two handles operate the door lock system. One is in the upper aft area of the door, and the other is in the lower forward area of the door. Two separate access covers must be opened to operate the two handles. There are no lock handles on the outside of the cargo door. It can be opened and closed only from inside the aircraft. To move the upper aft handle out of the locked position, depress the black release button in the handle. Then rotate the yellow handle upward as far as it will go. This movement transmits via cables to two hollow, crescent latches on the forward side and two on the aft side. The latches rotate to release latch posts in the cargo door frame. To move the lower lock handle out of the locked position (forward), lift the orange lock hook from the stud and rotate the handle aft as far as it will go. This movement transmits via linkage to four latch pins on the bottom of the cargo door. The pins move aft to disengage latch lugs at the bottom of the cargo door frame.. CAUTION After unlocking the bottom latch pins, close the forward lock handle access cover. If this cover is left open, it rotates on its hinge until a portion of it extends below the bottom of the cargo door when the cargo door is opened. When the cargo door is subsequently closed, the access cover breaks. To open the cargo door after it is unlocked, push out on the bottom of the door. After the cargo door is manually opened a few feet, gas springs raise the door to the fully open position.. To close the cargo door, pull it down and inboard. The gas springs resists the closing effort until the door is only open a few feet. Then, as the springs move over center, they begin applying a closing force to the door. An inflatable rubber seal around the perimeter of the cargo door seats against the door frame when closed. When the cabin is pressurized, air seeps into the rubber seal through small holes in the outboard side of the seal. The higher the cabin differential pressure, the more the seal inflates. This is a passive seal system and has no mechanical connection to a bleed air source.. WARNING Never attempt to unlock or check the security of the door in flight. If the door annunciator illuminates in flight, or if the pilot has any reason to suspect the door may not be securely locked, instruct all occupants to remain seated with seatbelts fastened. Re d u c e c a b i n p re s s u re t o t h e lowest practical value (considering altitude first). After the aircraft has made a full-stop landing, a crewmember should check the security of the airstair d o o r. Pe r f o r m t h e “ C i r c u i t r y Check” in the POH Normal Procedures section prior to the f i r s t f l i g h t o f t h e d a y. I f a n y condition specified in this procedure is not met, DO NOT TAKE OFF.. 350C AIRSTAIR ENTRANCE The airstair door is built into the cargo door. It is hinged at the bottom and swings downward when opened. The stairway is built onto the inboard side. Two of the stairsteps fold flat against the door when it is closed. When the door is opened, a self-storing platform automatically folds down over the door sill to protect the rubber door seal.. FOR TRAINING PURPOSES ONLY. 1-11. 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL.

(21) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. A hydraulic damper ensures the door swings down slowly when it opens. While the door is open, a plastic-encased cable that serves as a handrail supports the door. Additionally, this cable is used when closing the door from inside. A n i n f l a t a b l e r u b b e r s e a l a ro u n d t h e perimeter seats against the door frame as t h e d o o r i s c l o s e d . Wh e n t h e c a b i n i s pressurized, air seeps into the rubber seal through small holes in the outboard side of the seal. The higher the cabin differential pressure, the more the seal inflates. This is a passive-seal system with no mechanical connection to a bleed air source. The outside door handle can be locked with a k e y, f o r s e c u r i t y o f t h e a i r c r a f t o n the ground.. CAUTION Only one person should be on the airstair door stairway at any one time.. Locking Mechanism Rotating either outside or inside door handle locks the door. The handles move simultaneously. Three hollow, crescent latches on each side of the door rotate to capture or release latch posts in the cargo door to secure the airstair door. When l o c ke d , t h e a i r s t a i r d o o r b e c o m e s a n integral part of the cargo door. Whether unlocking the door from outside or inside, depress and hold the release button adjacent to the door handle before rotating the handle. Inside, rotate the handle counterc l o c k w i s e ; o u t s i d e, ro t a t e t h e h a n d l e clockwise. Unlocking the door is a two-hand operation requiring deliberate action.. 1-12. The release button acts as a safety device to prevent accidental opening. As an additional safety measure, a differential-pressuresensitive diaphragm is in the release-button m e c h a n i s m . Th e o u t b o a rd s i d e o f t h e diaphragm is open to atmospheric pressure; the inboard side opens to cabin air pressure. As the cabin-to-atmospheric pressure differential increases, it becomes increasingly difficult to depress the release button because the diaphragm moves inboard when either the outboard or inside release button is depressed.. FLIGHT DECK SEATS The pilot and copilot sit side by side in individual chairs, separated by the control pedestal. The seats are adjustable fore, aft, and vertically with release levers beneath the seats. Depressing the release lever on the side of the seat adjusts the angle of the seat. A button on the lower inboard side of the seat back controls the firmness of the lower seat back for lumbar control. After adjusting the seat back to a comfortable position, move forward on the seat to remove all the weight from the seat back. Hold the button in until the support fully inflates. Release the button and lean back in the seat. If the support is too firm, hold the button in until the desired degree of firmness is obtained. Each seat has seat belts and inertia-type shoulder harnesses. The shoulder harness consists of a Ystrap mounted to an inertia reel in the lower seatback. One strap is w o r n o v e r e a c h s h o u l d e r . Th e s t r a p terminates with a fitting that inserts into a rotary buckle.. FOR TRAINING PURPOSES ONLY.

(22) Release the shoulder harness straps and inboard lap belt simultaneously by rotating the buckle release 1/8 of a turn in a clockwise direction. The armrests have angular adjustment and vertical stowing. To stow the armrest, release the lever on its forward end and rotate the armrest aft to the vertical position.. Sun Visors Each crewmember has a sun visor. If the visor is stowed, push straight back and allow the visor to rotate down. Move it along the track to desired place. Pivot it out near the windshield or window. Rotate knob clockwise to lock. To change positions, rotate knob counterclockwise to unlock. Then move to desired location and position; relock.. INSTRUMENTS/CONTROLS Due to conventional dual controls, the aircraft can be flown by either pilot. The controls and instruments are arranged for convenient single-pilot operation, or pilot and copilot crew. The instrument panel poster that accompanies this manual illustrates a typical cockpit a r r a n g e m e n t . Th e a n n u n c i a t o r p a n e l chapter at the end of this manual locates specific annunciators and control panels. Each system chapter describes in detail the controls and instruments appropriate to that system. Fi g u r e s 1- 1 2 t h r o u g h 1- 2 1 i l l u s t r a t e each section.. To stow the visor, rotate knob counterclockwise and then move it along the track to recessed area of headliner. Pivot the visor up and press forward until the catch retains the assembly.. FOR TRAINING PURPOSES ONLY. 1-13. 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL.

(23) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. Figure 1-12. Overhead Light Control Panel. Figure 1-13. Glareshield. 1-14. FOR TRAINING PURPOSES ONLY.

(24) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. Figure 1-14 . Left Instrument Panel. Figure 1-15. Right Instrument Panel. FOR TRAINING PURPOSES ONLY. 1-15.

(25) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. Figure 1-16. Center Instrument Panel. 1-16. FOR TRAINING PURPOSES ONLY.

(26) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. Figure 1-17. Pilot Subpanels. Figure 1-18. Copilot Subpanels. FOR TRAINING PURPOSES ONLY. 1-17.

(27) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. Figure 1-19. Center Pedestal. 1-18. FOR TRAINING PURPOSES ONLY.

(28) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. Figure 1-20. Circuit Breaker Panel—Right Console. Figure 1-21. Fuel Control Panel—Left Console. FOR TRAINING PURPOSES ONLY. 1-19.

(29) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. CABIN FEATURES SEATS Passenger seats are installed on continuous tracks mounted on the floor. A placard on the horizontal leg cross brace denotes each seat as FRONT or AFT FACING. All passenger seats have adjustable headrests and shoulder harnesses. The seats are adjustable fore and aft (7 inches [17.8 cm]) and laterally (2 1/2 inches [6.35 cm]). Seat backs may be adjusted for maximum comfort. Some seats may swivel through approximately 45º (Figure 1-22).. Figure 1-22. Passenger Seats. A two-position lever on the forward face of the inboard armrest and a button on the inboard side of the armrest adjust the seats. Moving the lever upward releases the seat for fore and aft and/or lateral movement. Release the lever to lock seat in desired position. Depressing the button adjusts the seatback. Release the button when the back is in the desired position. If no weight is applied to the seatback when the button is depressed, the seatback returns to the upright position. Before takeoff and landing, lateral tracking seats should be in the outboard position, all seatbacks positioned upright, and all headrests fully extended.. 1-20. The inboard armrest on each seat can be stowed if desired. Lift the armrest to the full-up position to unlatch the mechanism. Lower the armrest to stow. To use the armrest, simply raise it to the fullup position. Then allow it to settle to the locked position. If the armrest does not lock in the up position, cycle it fully down and back to the up position to reset the locking mechanism.. Foyer Seat A hinged seat cushion on the top of the toilet forms an extra passenger seat when the toilet is not is use (Figure 1-23).. Figure 1-23. Toilet Seat. TOILET On B350 models, the side facing toilet in the foyer faces the airstair door. On B350C models, the forward facing toilet is in the baggage compartment. Raise the hinged lid to access the toilet. If a Monogram electrically flushing toilet is installed, the sliding knife valve should be open at all times except during servicing. Open the cabinet below the toilet to access the knife valve actuator handle.. FOR TRAINING PURPOSES ONLY.

(30) Relief Tubes A relief tube is in the seat shroud of the side facing toilet (B350) or on the baggage compartment wall forward of the toilet (B350C). An optional relief tube may also be installed in the cockpit and stowed under the pilot seat. A valve lever is on the side of the relief tube horn. When the tube is in use, the lever must be depressed at all times. The relief tubes are for use during flight only.. The inverter also shuts down for an output short circuit. Following a short circuit shutdown, the inverter can be manually reset by cycling the furnishing switch off and on.. Furnishing Switch A switch on the cockpit overhead panel controls the inverter. The two-position switch FURN ON/OFF is standard. An optional switch has the following positions: FURN COFFEE ON/FURN ON/OFF. The inverter operates when the switch is in FURN ON or FURN COFFEE ON position.. AC POWER The aircraft has four AC power outlets to provide 115 VAC for laptop computers. The outlets are on each side of the cabin beneath the cabin tables. Access by lifting the cover placarded 115 VAC. One 115-volt, 60-Hz inverter powers the outlets. The inverter is in the right center section wing just outboard of the nacelle. The left generator bus supplies 28 VDC for the inverter through the INVERTER circuit breaker in the DC Power distribution panel under the center aisle floor. A 115 VAC-5 AMP circuit breaker adjacent to the inverter protects its output. For normal operation, input current to the inverter can vary from approximately 0.5 amperes to approximately 20 amperes depending on the load. The inverter is capable of providing a continuous output of 4 amperes. The total electrical load connected to the four outlets must not exceed 4 amperes. Excess load may cause the inverter input circuit breaker to open.. BAGGAGE COMPARTMENT On Model 350, the entire aft-cabin area aft of the foyer may be used as a baggage compartment. A nylon web restrains loose items. O n M o d e l 3 5 0 C, a s e p a r a t e b a g g a g e compartment is aft of the passenger compartment. A partition separates it from the passenger area. The toilet is on the aft wall of the baggage compartment. A nylon web restrains items. Unless authorized by applicable Departmen of Transportation Regulations, do not carry hazardous material anywhere in the aircraft. D o n o t c a r r y c h i l d re n i n t h e b a g g a g e compartment unless secured in a seat. Secure baggage and other objects with webs to prevent shifting in turbulent air.. The inverter shuts down for input over voltage, under voltage and high internal temperature conditions. It automatically resets when the conditions are corrected.. FOR TRAINING PURPOSES ONLY. 1-21. 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL.

(31) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. CONTROL SURFACES The King Air 350 has conventional ailerons and rudder. A T-tail horizontal stabilizer and elevator mounted at the extreme top of the vertical stabilizer. Conventional dual controls in the flight deck operate the cablecontrol surfaces.. Any time the aircraft is parked overnight or in windy conditions, install the rudder g u s t p i n a n d c o n t ro l l o c k s t o p re v e n t damage to the control surfaces and hinges or the controls (Figure 1-24). Dual push rod actuators are installed on all pilot controlled trim tabs.. Figure 1-24. Flight Control Locks. 1-22. FOR TRAINING PURPOSES ONLY.

(32) GENERAL OPERATING INFORMATION PREFLIGHT INSPECTION The preflight inspection procedure has been divided into five areas as shown in Figure 1-25. The inspection begins in the flight compartment, proceeds aft, then moves clockwise around the aircraft.. TIEDOWN AND SECURING When the aircraft is parked overnight o r d u r i n g h i g h w i n d s, i t s h o u l d b e securely moored with protective covers (Figure 1-26). Place wheel chocks fore and aft of the main gear wheels and nose wheel. Using the mooring points, tie the aircraft down with suitable chain or rope. Install the control surface lock. Ensure flaps are up.. Figure 1-25. Preflight Inspection. FOR TRAINING PURPOSES ONLY. 1-23. 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL.

(33) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. Secure the propellers to prevent windmilling. This aircraft has free-spinning propellers that could be hazardous if not restrained. Allowing engine gears and bearings to windmill without lubrication is not a good practice. Install the engine inlet cover if there is blowing dust or rain. Before towing the aircraft, release the parking brake (brake handle pushed in) just under the left corner of the subpanel. Remove the rudder gust lockpin from the pinhole in the pilot floorboard. Serious damage to the tires, brakes, and steering l i n k a g e c a n re s u l t i f t h e s e i t e m s a r e not released.. TAXIING The ground turning radii are predicated on the use of partial braking action and differential power. Locking the inside brake can cause tire or strut damage. If the wingtip clears obstacles when turning the aircraft, the tail also clears. Because of the propeller windstream, an area directly to the rear of the engines can be hazardous to persons or parked aircraft when taxiing, turning, and starting t h e e n g i n e s. Wh i l e t h e v e l o c i t i e s a n d temperatures cannot be accurately measured, exercise reasonable care to prevent incidents within these danger areas (Figure 1-27).. PARKING BRAKE. PROPELLER TIEDOWNS. Figure 1-26. Tiedowns. 1-24. FOR TRAINING PURPOSES ONLY.

(34) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. Figure 1-27. Turn Radius and Danger Areas. FOR TRAINING PURPOSES ONLY. 1-25.

(35) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. SERVICING DATA. Air Min Control Speed (V MCA ). The Handling, Servicing, and Maintenance section of the POH outlines requirements for maintaining the King Air 350 in a condition equal to its original manufacture. This information sets time intervals at which the aircraft should be taken to a Hawker/ Beechcraft Service Center for periodic servicing or preventive mainten a n c e. A l l l i m i t s, p r o c e d u r e s, s a f e t y practices, time limits, servicing, and maintenance requirements contained in the POH are mandatory. This section of the POH also includes a consumable materials chart that lists approved and recommended materials for servicing the aircraft. The servicing data diagram (Figure 1-28) lists and illustrates servicing points and materials required. This chart is for reference only and is always superseded by the POH information.. LIMITATIONS Model 350ER limitations are in parenthesis where applicable.. AIRSPEED LIMITATIONS Maneuvering Speed (V A) 184 (182) KIAS Max Flap Extension/Extended Speeds (V FE ):. Propeller Feathered/ Flaps Up ..................... 94 (10 1) KIAS Propeller Feathered/ Flaps Approach............ 93 (98) KIAS Maximum Operating Speed V MO ............................. 263 (245) KIAS M MO ....................................... 0.58 Mach. Airspeed Indicator Display Red line ............................................ V MCA Solid red bar ........ Impending stallspeed low speed cue DN (white) ...................... Maximum speed permissible with flaps extended beyond approach APP (white) .................. Maximum speed permissible with flaps in approach position Blue line .................................. One-engine inoperative best rate-of-climb speed Solid red bar at top .............. V MO marker. WEIGHT LIMITS Max Ramp Weight .. 15,10 0 (16,600) lbs Max Takeoff Weight 15,000 (16,500) lbs. Approach ............................... 202 KIAS. Max Landing Weight 15,000 (15,675) lbs. Full Down .............................. 158 KIAS. Max Zero Fuel Weight 12,500 (13,000) lbs. Maximum Landing Gear Extended Speed (V LE )................................. 184 (182) KIAS M a x La n d i n g G e a r O p e ra t i n g S p e e d s (V LO ). Max Weight in Baggage Compartment: .......... 550 lbs Max Weight in Wing Lockers ........ 300 lbs. Extension ................... 184 (182) KIAS Retraction .................. 166 (164) KIAS. 1-26. FOR TRAINING PURPOSES ONLY.

(36) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. Figure 1-28. Service Data. FOR TRAINING PURPOSES ONLY. 1-27.

(37) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. MAXIMUM OPERATING LIMITS Normal Operation ...................... 35,0 0 0 ft Yaw Damp System .... 5,000 or 19,0 0 0 ft (strakes) With Aviation Gasoline: Both Standby Pumps Operative 35,000 ft Either Standby Pump Inoperative ................................ Prohibited Climb without crossfeed capability........................................ 20,0 0 0 ft. MAXIMUM OUTSIDE AIR TEMPERATURE LIMITS Sea Level to 25,000 ft Pressure Altitude ...................... ISA +37 C Above 25,000 ft Pressure Altitude ...................... ISA +31 C. GENERAL LIMITATIONS Acrobatic maneuvers, including spins, are prohibited.. Th e f o l l o w i n g l i m i t a t i o n s a p p l y when continued flight is required with a cracked outer or inner ply of the windshield. • Flight limited to 25 flight hours • Crack(s) must not impair visibility • Crack(s) must not interfere with use of windshield wipers for flights requiring use of wipers • Wi n d s h i e l d a n t i - i c e m u s t b e operational for flights into icing conditions • Following placard must be installed in view of the pilot: MAXIMUM AIRPLANE ALTITUDE IS LIMITED TO 25,0 0 0 FEET. CABIN ∆P MUST BE MAINTAINED BETWEEN 2.0 AND 4.6 PSI DURING FLIGHT Windshields that have cracks in both the inner and outer plies must be replaced prior to the next flight unless a special flight permit is obtained from the local FAA Flight Standards District Office.. Seat back of each occupied aft-facing seat must be in the upright position and headrest fully extended for takeoff and landing. All cargo must be properly secured by an FAA-approved cargo restraint system. Cargo must be arranged to permit free access to all exits and emergency exits.. CRACKED OR SHATTERED WINDSHIELD Windshields with a shattered inner ply have numerous cracks that obstruct forward vision. Small particles or flakes of glass can break free of the windshield and interfere with the crew's vision. These windshields must be replaced prior to the next flight unless a special flight permit is obtained f ro m t h e l o c a l FA A F l i g h t S t a n d a rd s District Office.. 1-28. FOR TRAINING PURPOSES ONLY.

(38) CRACK IN SIDE WINDOW (COCKPIT OR CABIN). Airspeeds for Safe Operation 15,000 (16,500) Lbs. The following limitations apply when continued flight is required with a cracked outer or inner ply in any side window. These limitations do not apply to minor compression-type chips (clamshell) that may occur on the milled edge of cockpit side windows. Refer to the maintenance manual for the disposition of such chips.. Max Demonstrated Crosswind Component .................................... 20 KIAS. • Limited to 25 flight hours. • Flights must be conducted with cabin depressurized. • Following placard must be installed in clear view of the pilot:. Two-Engine Best Angle-of-Climb (V X ).................................... 125 (135) KIAS Two-Engine Best Rate-of-Climb (V Y ) .................................. 140 (135) KIAS Cruise Climb: • Sea Level to 10,0 0 0 feet 170 KIAS • 10,0 0 0 to 15,0 0 0 feet ...... 160 KIAS • 15,0 0 0 to 20,0 0 0 feet ...... 150 KIAS • 20,0 0 0 to 25,0 0 0 feet ...... 140 KIAS • 25,0 0 0 to 30,0 0 0 feet ...... 130 KIAS. PRESSURIZED FLIGHT IS PROHIBITED DUE TO A CRACKED SlDE WINDOW. CONDUCT FLIGHT WITH THE CABIN PRESSURE SWITCH IN THE DUMP POSITION. • 30,0 0 0 to 35,0 0 0 feet ...... 120 KIAS Turbulent Air Penetration ...... 170 KIAS Intentional One-Engine Inoperative Speed (V SSE ) .............................. 110 (135) KIAS. Overspeed Warning MISCELLANEOUS AIRSPEEDS Emergency Airspeeds 15,000 (16,500) lbs Model 350ER airspeeds are in parenthesis where applicable.. An overspeed warning horn sounds when the airspeed exceeds the barber pole by no more than 6 knots or .0 1 Mach, whichever is less. A test switch on the copilot left subpanel allows the pilot to test the overspeed warning prior to flight.. One-Engine-Inoperative Best Angle-ofClimb (V XSE ) .............................. 125 KIAS One-Engine-Inoperative Best Rate-ofClimb (V YSE ) .............................. 125 KIAS Air Minimum Control Speeds (V MCA ): Flaps Up .................................... 94 KIAS Flaps Approach ....................... 93 KIAS One-Engine-Inoperative Enroute Climb ............................................ 125 KIAS Emergency Descent .................. 184 KIAS Maximum Range Glide ............ 135 KIAS. FOR TRAINING PURPOSES ONLY. 1-29. 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL.

(39) 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. INTENTIONALLY LEFT BLANK. 1-30. FOR TRAINING PURPOSES ONLY.

(40) QUESTIONS 1. Aircraft equipped with dual strakes require yaw damper operation above _________ feet: A. 13,000 B. 15,000 C. 19,000 D. 20,000. 6. Single pilot operations require: A. The pilot to use a headset with a boom microphone. B. A flight attendant. C. Operations not to be conducted under 14 CFR Part 135. D. Operations only during Day VFR.. 2. Lateral-tracking seats must be in the full _______ position for _______ A. Outboard; takeoff only. B. Inboard; landing. C. Inboard; takeoff and landing. D. Outboard; takeoff and landing.. 7. With appropriate equipment, the kinds of operations allowed: A. Permit flight at night. B. Prohibit flight at night. C. Pe r m i t f l i g h t i n i c e d u r i n g d a y operations only. D. Prohibit flight in ICE during night operations.. 3. Illumination of the red master warning annunciator [DOOR UNLOCKED] indicates: A. The emergency escape hatch is open or not secure. B. The airstair door is open or not secure. C. The emergency or airstair door is open or not secure. D. Both the emergency and airstair doors are open or not secure. 4. Th e m a x i m u m a l l o w e d o p e r a t i n g altitude limit is ________ feet. A. 30,000 B. 35,000 C. 37,000 D. 41,000 5. Th e m a x i m u m a l l o w e d o p e r a t i n g temperature limit above 25,000 feet is ISA + ______°C. A. 25 B. 27 C. 31 D. 37. 8. Passenger briefing cards are required at one per seat for: A. All operations. B. 14 CFR Part 135 operations. C. 14 CFR Part 135 operations with out a flight attendant. D. Single pilot operations only. 9. V XSE is _______ KIAS. A. 84 B. 125 C. 135 D. 140 10. V MCA for Flaps Approach is ______ KIAS. A. 85 B. 93 C. 94 D. 140. FOR TRAINING PURPOSES ONLY. 1-31. 1 AIRCRAFT GENERAL. KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL.

(41) KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. CHAPTER 2 ELECTRICAL POWER SYSTEMS. Page INTRODUCTION ............................................................................................................... 2-1 GENERAL ........................................................................................................................... 2-1 COMPONENTS ................................................................................................................... 2-2 Battery ............................................................................................................................ 2-2 Starter/Generators ........................................................................................................ 2-3 Ammeters....................................................................................................................... 2-5 CIRCUIT BREAKERS ...................................................................................................... 2-5 Buses ............................................................................................................................... 2-7 OPERATION ....................................................................................................................... 2-9 Protection ....................................................................................................................... 2-9 Starting ......................................................................................................................... 2-11 Normal Operation....................................................................................................... 2-13 EXTERNAL POWER ...................................................................................................... 2-16 EMERGENCY AND ABNORMAL INDICATIONS ................................................ 2-17 Battery .......................................................................................................................... 2-18 Circuit Breaker Tripped ............................................................................................. 2-19 Generators ................................................................................................................... 2-19 System Distribution Schematics................................................................................ 2-22 CIRCUIT BREAKER LISTING .................................................................................... 2-27 QUESTIONS ...................................................................................................................... 2-31. FOR TRAINING PURPOSES ONLY. 2-i. 2 ELECTRICAL POWER SYSTEMS. CONTENTS.

(42) KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. ILLUSTRATIONS Title. Page. 2-1. Basic Electrical Symbols....................................................................................... 2-2. 2-2. Battery Installation ............................................................................................... 2-2. 2-3. Starter/Generator Installation ............................................................................. 2-3. 2-4. Pilot Subpanel........................................................................................................ 2-4. 2-5. Overhead Light Control and Meter Panel......................................................... 2-5. 2-6. Left Circuit Breaker Panel................................................................................... 2-5. 2-7. Copilot Sidewall Circuit Breaker Panel ............................................................. 2-6. 2-8. King Air 350 Electrical System Component Location ..................................... 2-7. 2-9. Electrical System ................................................................................................... 2-8. 2-10. BAT Switch ON................................................................................................... 2-11. 2-11. Right Engine Start .............................................................................................. 2-12. 2-12. Cross Generator Start ........................................................................................ 2-13. 2-13. Both Generators On........................................................................................... 2-14. 2-14. Both Generators On — Generator Ties Open................................................ 2-15. 2-15. External Power.................................................................................................... 2-16. 2-16. BAT TIE OPEN.................................................................................................. 2-18. 2-17. L/R GEN TIE OPEN......................................................................................... 2-19. 2-18. L/R DC GEN Annunciators.............................................................................. 2-19. 2-19. Dual Generator Failure...................................................................................... 2-21. 2-20. Battery Off........................................................................................................... 2-22. 2-21. Right Generator On ........................................................................................... 2-23. 2-22. Bus Sense Test with Both Generator On......................................................... 2-24. 2-23. Left Generator Bus Isolated ............................................................................. 2-25. FOR TRAINING PURPOSES ONLY. 2-iii. 2 ELECTRICAL POWER SYSTEMS. Figure.

(43) KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. 2-24. Center Bus Isolated ........................................................................................... 2-26. 2-25. Triple-Fed Bus Isolated ..................................................................................... 2-27. TABLES 2 ELECTRICAL POWER SYSTEMS. Table. Title. Page. 2-1. King Air 350 Load Management...................................................................... 2-20. 2-2. Circuit Breakers.................................................................................................. 2-28. 2-iv. FOR TRAINING PURPOSES ONLY.

(44) KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. 2 ELECTRICAL POWER SYSTEMS. CHAPTER 2 ELECTRICAL POWER SYSTEMS. INTRODUCTION A thorough understanding of the aircraft electrical system eases pilot workload in normal operations and prepares him for any electrical malfunctions that may occur. This chapter describes the electrical system components and operations so the pilot can quickly locate switches and circuit breakers for appropriate corrective actions in abnormal and emergency situations.. GENERAL The electrical system is a 28-volt DC system with the negative lead of each power source grounded to the main aircraft structure. Tw o s t a r t e r- g e n e r a t o r s c o n n e c t e d i n parallel and a battery provide the direct current.. An external power receptacle is available for an external power unit to provide electricity while the aircraft is on the ground. Power from these sources is distributed to the individual electrical loads with a multibus system. Each power source electrically. FOR TRAINING PURPOSES ONLY. 2-1.

(45) KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. 2 ELECTRICAL POWER SYSTEMS. connects to the distribution system through relays and line contactors. Bus tie relays and individual bus relays interconnect the buses.. COMPONENTS. The electrical system provides maximum protection against loss of electrical power if a ground fault (or short) occurs.. The battery for the King Air 350 is a 42ampere-hour sealed lead acid battery. It is in the right wing center section in an aircooled box (Figure 2-2).. BATTERY. The schematics in this chapter use basic electrical symbols to illustrate the system. (Figure 2-1) provides a key to those symbols. BATTERY. FUSE. CURRENT LIMITER (OR ISOLATION LIMITER) THIS ACTS AS A LARGE, SLOW-BLOW FUSE. DIODE THE DIODE ACTS AS A ONE-WAY "CHECK VALVE" FOR ELECTRICITY. (Triangle points in direction of power flow. Power cannot flow in opposite direction.). CIRCUIT BREAKER. SWITCH - TYPE CIRCUIT BREAKER. The battery is used for engine starting and as a final redundant power source if both generators fail. To meet specified battery duration times, the battery charge current must be 10 amps or less prior to takeoff. Takeoff with a battery charge current above 10 amps is permitted at the discretion of the pilot.. RELAY OPEN. The BAT switch and BAT BUS switch on the pilot left subpanel control the battery. With both switches in OFF, the battery disconnects from all electrical loads.. RELAY CLOSED. BUS TIE & SENSOR. Figure 2-1. Basic Electrical Symbols. 2-2. Figure 2-2. Battery Installation. BAT BUS Switch The BAT BUS switch controls a remote c o n t ro l c i rc u i t b re a ke r i n t h e battery compartment that functions as a battery bus contactor.. FOR TRAINING PURPOSES ONLY.

(46) KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. When the switch is in the EMER OFF position, the remote control circuit breaker o p e n s t o i s o l a t e t h e b a tt e r y f ro m t h e battery bus.. BAT Switch When the BAT switch is in ON, it closes the battery relay to apply power to the triplefed bus. The battery bus tie closes to apply power to the center bus. In the OFF position, both the battery relay and the battery bus tie relay open to disconnect the battery from all buses except the battery bus.. STARTER/GENERATORS. units (Figure 2-3). The unit is used as a starter to drive the engine during engine start and as a engine-driven generator to provide electrical power. A series starter winding is used during starter operation; a shunt field winding is used during generator operation. The regulated output voltage of the generator is 28.25 (±0.25) volts with a maximum continuous load rating of 30 0 amperes. In addition to the starter/generators, the generator system consists of control switches, generator control units (GCU), line contactors and loadmeters.. Starter Function The center bus provides starter power through a starter relay. A three-position IGNITION AND ENGINE START switch for each engine on the pilot left subpanel controls the operations. Switch positions are ON-OFF-STARTER ONLY.. Th e t w o 2 8 - v o l t , 3 0 0 - a m p e re s t a r t e r / generators are dual-purpose, engine-driven. Figure 2-3. Starter/Generator Installation. FOR TRAINING PURPOSES ONLY. 2-3. 2 ELECTRICAL POWER SYSTEMS. When the switch is in the NORM position, battery power is applied to the battery bus. Because the battery bus powers such items a s e n t r y l i g h t s a n d c l o c k s, t h i s i s t h e normal position..

(47) KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. 2 ELECTRICAL POWER SYSTEMS. Actuating a switch to either the STARTER ONLY or ON position supplies a signal to the start relay and generator field sense relay. The start relay energizes the starter. The generator field sense relay disables the shunt field to prevent generator operation during the start cycle. The starter drives the compressor section of the engine through accessory gearing.. Generator Function The generating function is self-exciting and does not require battery power for o p e ra t i o n . I t u s e s g e n e ra t o r re s i d u a l voltage for initial generator buildup.. the GEN RESET position, the generator voltage builds up to 28 volts and the line contactor is open. When the generator switch is released to ON, the line contactor closes.. Generator Control Unit Tw o g e n e ra t o r c o n t ro l u n i t s ( G C U s ) control generator operation. The GCU below the center aisle floor makes constant v o l t a g e a va i l a b l e t o t h e b u s e s d u r i n g variations in engine speed and electrical load requirements. The GCUs provide the following functions: • Voltage regulation/line contactor control. GEN Switch The L GEN and R GEN switches in the pilot left subpanel are under the MASTER SWITCH gang bar (Figure 2-4). Switch positions are GEN RESET–ON–OFF.. • Overvoltage/overexcitation protection • Paralleling/load sharing • Reverse-current protection. Placing the switch momentarily in GEN RESET and then releasing to the ON position brings the generators on-line. In. • Cross-generator-start current limiting. Figure 2-4. Pilot Subpanel. 2-4. FOR TRAINING PURPOSES ONLY.

(48) KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. AMMETERS Left and right loadmeters on the overhead meter panel display the load on each generator (Figure 2-5).. Voltage on each bus may also be monitored on the voltmeter with the VOLTMETER BUS SELECT switch adjacent to the voltmeter. Selector positions include EXT PWR, CTR , L GEN, R GEN, TPL FED, BAT. Move the selector switch to appropriate position and then read the voltage on the adjacent loadmeter.. CIRCUIT BREAKERS DC power is distributed to the various systems via circuit breakers that protect most of the components in the aircraft. Two of these circuit breaker panels are in the cockpit. Each of the circuit breakers has its amperage rating printed on it. The smaller breaker panel is to the left of the pilot below the fuel management panel (Figure 2-6). The larger circuit breaker panel is on the copilot sidewall (Figure 2-7).. Figure 2-5. Overhead Light Control and Meter Panel. Figure 2-6. Left Circuit Breaker Panel. FOR TRAINING PURPOSES ONLY. 2-5. 2 ELECTRICAL POWER SYSTEMS. Each of these protection features is discussed in detail in the Operation portion of this chapter..

(49) KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. A color-coded ring around each circuit breaker indicates the bus to which the circuit breaker connects. The triple-fed bus and battery bus circuit breakers are colorcoded yellow; left generator bus circuit breakers are blue; right generator bus circuit breakers are green; and the standby bus circuit breakers are red. 2 ELECTRICAL POWER SYSTEMS. Circuit breaker switches on the pilot right subpanel protect components such as exterior lighting and ice protection e q u i p m e n t . Th e s e s w i t c h e s h a v e t h e amperage rating stamped on the end of the switch. A typical listings of all buses and circuit breakers is at the end of this chapter.. Procedures for handling tripped circuit breakers and other related electrical system warnings are in the Emergency and Abnormal Procedures section of the Pilot’s Operating Handbook. As a general rule if a nonessential circuit breaker trips in flight, do not reset it. Resetting a tripped breaker could cause further damage to the component or system. If an essential system circuit breaker such as an avionics breaker trips, let it cool and then reset it. If it fails to reset, do not attempt to reset it again. Take corrective action according to the procedures in the appropriate section of the POH.. Figure 2-7. Copilot Sidewall Circuit Breaker Panel. 2-6. FOR TRAINING PURPOSES ONLY.

(50) KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. • Ba tt e r y b u s — Ba tt e r y t h ro u g h a remote control circuit breaker. BUSES Electrical loads are divided among the buses. Equipment on the buses is arranged so that all items with duplicate functions (such as right and left landing lights) connect to different buses (Figure 2-8).. • Left and right generator bus—Left and right generators. • Center bus—Both generator buses and battery. In normal operation, all buses are automatically tied into a single-loop system where all sources supply power through individual protective devices.. The generator buses connect to the center bus with the left and right bus tie relays. The battery connects through the battery bus tie, which closes when the BAT switch is in. Buses and main power sources are the following:. LEGEND ABBREVIATIONS USED L = LEFT R = RIGHT B = BATTERY BT = BUS TIE LC = LINE CONTACTOR SB = SUB BUS SR = STARTER RELAY BB = BATTERY BUS DFB = DUAL FED BUS. EPR = EXTERNAL POWER RELAY STR/GEN = STARTER GENERATOR GEN CONT = GENERATOR CONTROL EXT PWR = EXTERNAL POWER CTR BUS = CENTER BUS RG = RIGHT GENERATOR LG = LEFT GENERATOR RCCB = REMOTE CONTROL CIRCUIT BREAKER. STR/ GEN. STR/ GEN. L L C. L G B U S. R L C. L S R. L B T. DUAL FED BUS. L S B. CTR BUS. BATT BUS. R S R. TRIPLE FED BUS. R B T. R S B. R G B U S. EXT PWR. RCCB EPR B R. B B T. BBS BATTERY BS GEN GEN CONT CONT. Figure 2-8. King Air 350 Electrical System Component Location. FOR TRAINING PURPOSES ONLY. 2-7. 2 ELECTRICAL POWER SYSTEMS. • Triple-fed bus—Battery and both generators buses.

(51) KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. comes on line. If the battery is the only power source on line, both generator bus ties open to isolate the left and right generator buses from the battery. Equipment that remains operational during battery only operations has a white ring around the control switch.. ON. The battery is then available for center bus loads or recharging (Figure 2-9).. GEN TIES Switch In the OPEN position, both the left and right bus tie relays open to isolate both generator buses from the center bus. The NORM position allows automatic closure of the left and right bus tie relays when either generator or external power LEFT STARTER RELAY. TO GENERATOR FIELD. BUS SENSE GEN TIES RESET MAN CLOSE SPRING LOADED TO CENTER. STARTER/ GENERATOR. TEST L DC GEN. LOAD METER. L GEN TIE OPEN. LEFT STARTER RELAY. SPRING LOADED FROM MAN CLOSE TO CENTER LEVER LOCK OUT OF CENTER. OPEN R GEN TIE OPEN. LEFT GENERATOR SWITCH. LEFT LINE CONTACTOR. TO GENERATOR FIELD. STARTER/ GENERATOR. R DC GEN. LOAD METER. BAT TIE OPEN. RIGHT GENERATOR SWITCH. RIGHT LINE CONTACTOR. MAN TIES CLOSE. GENERATOR CONTROL. GENERATOR CONTROL 275. 275 250. H E D. LEFT GEN BUS. ESIS BATT 5. ESIS BATT BUS BAT BUS SWITCH NORMAL. 60. 250. H E D. CENTER BUS. RIGHT GEN BUS RIGHT GENERATOR BUS TIE. EXT PWR RECEPTACLE. BAT BUS CONTROL .5A. EXT PWR RELAY. BATTERY BUS TIE. BAT BUS. RCCB FROM BAT BUS. DUAL-FED BUS 275. 2 ELECTRICAL POWER SYSTEMS. Momentarily placing the MAN TIE switch in the MAN CLOSE position during battery operation closes both generator bus ties. The battery then powers the generator buses.. HED. BATTERY AMMETER BATT SWITCH. BATTERY. BATTERY RELAY. 60. 20A. TRIPLE FED BUS. Figure 2-9. Electrical System. 2-8. FOR TRAINING PURPOSES ONLY. 60.

(52) KING AIR 350/350C PRO LINE 21 PILOT TRAINING MANUAL. BUS SENSE Switch Bus current sensors sense current to each generator bus from the center bus and current to the center bus from the battery. If either generator bus sensor senses a high current condition, it opens the corresponding generator bus tie to isolate the bus. If the battery bus sensor senses a high battery discharge current, it opens the battery bus tie to isolate the battery. The battery bus sensor does not work during engine starts and landing gear operation. Th e BU S S E N S E s w i t c h o n t h e p i l o t subpanel resets and tests the sensors. The RESET position resets the bus current sensors if they have tripped because of a test or an actual high current condition. The momentary TEST position opens the bus current sensors for the generator bus ties and battery ties. The yellow caution L and R GEN TIE OPEN and BAT TIE OPEN annunciators illuminate.. The AVIONICS MASTER circuit breaker in the right circuit breaker panel provides the power to control the avionics relays. If the avionics buses become disconnected as a result of a control circuit fault, the AVIONICS MASTER circuit breaker can be pulled to restore power.. OPERATION Th e D C p o w e r d i s t r i b u t i o n s y s t e m i s commonly called a triple-fed system because most buses receive power from three sources. The triple-fed bus powers many systems. Th r e e s o u r c e s ( g e n e r a t o r b u s e s a n d battery) power the triple-fed bus. It only receives power; it does not transfer electricity from one part of a system to another. That is a function of the the center bus. Because of this arrangement, a backup power source is available to most of the aircraft electrical systems. In normal operation, all buses are automatically tied together so that the battery and two generators collectively supply power through individual protective devices.. PROTECTION. AVIONICS MASTER POWER Switch Th re e a v i o n i c s b u s e s a re e l e c t r i c a l l y connected to the main distribution system through avionics relays. The AVIONICS MASTER POWER switch on the pilot subpanel controls these relays. The ON position opens the control circuit so the relays are in their normally closed p o s i t i o n s. Th i s s u p p l i e s p o w e r t o t h e avionics buses. The OFF position applies control power to the relays to disconnect the avionics buses.. The bus tie system protects the electrical system from excessively high current flow. The abilities to isolate a bus and load shed are equally important protective features. The system automatically removes excess loads (generator buses) when the power source is reduced to battery only. When both generators fail, the generator bus ties open to shed generator bus loads. The battery continues to power the center, triple-fed, and battery buses. If necessary, use the GEN TIE switch to manually close the generator ties. This restores power to the generator buses.. FOR TRAINING PURPOSES ONLY. 2-9. 2 ELECTRICAL POWER SYSTEMS. The green advisory MAN TIES CLOSE annunciator illuminates to indicate the generator bus ties have been manually closed during battery operation..

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