737 Systems Schematics

(1)

Bleed Air System Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

R L 80 60 80 100 0 20 PSI R L 9th STAGE 5th STAGE STARTER ENGINE BLEED AIR VALVE BLEED TRIP SENSORS APU BLEED AIR VALVE BLEED AIR CONDITION:

ENGINES OPERATING & SUPPLYING AIR CONDITIONING PACKS 737-400 1 1 BLEED AIR DUCT TO HYD RESERVE TO HYD RESERVE ISOLATION VALVE TO PACK VALVE WING TAI VALVE TO TURBOFAN TO WING TIA TURBOFAN VALVE STARTER VALVE HIGH STAGE VALVE COWL TAI TO ASP TAT PROBE DUCT PRESSURE TRANSMITTER EXTERNAL AIR CONNECTION FROM RIGHT ENGINE

L RECIRC FAN R RECIRC FAN

L PACK _ISOLATION R PACK

VALVE TRIP RESET S APU BLEED 1 2 OFF AUTO WING-BODY OVERHEAT WING-BODY OVERHEAT PACK TRIP OFF WING ANTI ICE WING ANTI ICE PACK TRIP OFF BLEED TRIP OFF BLEED TRIP OFF OFF ON OFF ON OFF AUTO OFF AUTO AUTO HIGH OFF AUTO HIGH OPEN CLOSE OVHT TEST R L 80 60 80 40 100 0 20 PSI R L

(2)

Wing-Body Overheat Ducts & Lights

Boeing 737

-300/400/500

Southeast Flight Support

SFS

R L 80 60 80 40 100 0 20 PSI R L R RECIRC FAN

L PACK _ISOLATION R PACK

VALVE TRIP RESET APU BLEED 1 2 WING-BODY OVERHEAT

WING-BODY

OVERHEAT

WING-BODY

OVERHEAT

WING-BODY OVERHEAT PACK TRIP OFF WING ANTI ICE WING ANTI ICE PACK TRIP OFF BLEED TRIP OFF BLEED TRIP OFF OFF ON OFF ON OFF AUTO OFF AUTO AUTO HIGH OFF AUTO HIGH OPEN CLOSE OVHT TEST 1

L RECIRC FAN R RECIRC FAN OFF AUTO OFF AUTO 1 2 3 4 5 6 7 8 LEFT LIGHT SENSORS LOCATED: 1. LEFT ENGINE STRUT. 2. LEFT INBOARD WING

LEADING EDGE. 3. LEFT-HAND AIR

CONDITIONING BAY 4. KEEL BEAM

5. BLEED DUCT FROM APU.

RIGHY LIGHT SENSORS LOCATED: 6. RIGHT ENGINE STRUT. 7. RIGHT INBOARD WING

LEADING EDGE. 8. RIGHT-HAND AIR CONDITIONING BAY 737-400 1 R L 80 60 80 40 100 0 20 PSI R L

(3)

Air Conditioning Pack Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

R PACK

WING-BODY

OVERHEAT

PACK

TRIP OFF

OFF

AUTO

HIGH

WING

ANTI

ICE

AIR CYCLE MACHINE WATER SEPARATOR MIXING CHAMBER PASS CABIN TO MIX MANIFOLD RAM AIR AUTO TEMP CONTROLLER HOT AIR MIX VALVE PACK VALVE RIGHT BLEED AIR BLEED AIR COLD AIR MIX VALVE CONDITIONED AIR COLD AIR HEAT EXCHANGER COOLED AIR BLEED AIR AUTO COOL WARM COOL WARM MANUAL

.

_.

(4)

WING-BODY

OVERHEAT

PACK

TRIP OFF

OFF

AUTO

HIGH

WING

ANTI

ICE

R PACK

Air Conditioning Distribution Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

CONT CABIN

AIR TEMP

PASS CABIN

60 80 40 20 0 100 TEMP CO LD HO T _COL D H O T

DUCT

OVERHEAT

DUCT

SUPPLY DUCT AIR MIX

VALVE AIR MIXVALVE PASS

CABIN

.

FILTER LEFT SIDEWALL RISER RECIRC FAN LEFT PACK TRIP OFF RIGHT PACK TRIP OFF RIGHTDUCT OVERHEAT

DRIVES MIX VALVES FULL COLD

TO RIGHT SIDEWALL RISER

LEFT DUCT OVERHEAT

FROM LEFT PACK FROM RIGHT PACK

MIXED MANIFOLD GROUND PRECONDITIONED AIR SUPPLY TO RIGHT PACK VALVE CONDITIONED AIR CONDITION: IN FLIGHT PACKS ON

.

(5)

WING-BODY OVERHEAT

PACK

OFF AUTO HIGH

R PACK

WING ANTI ICE

Air Conditioning Pack Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

WATER SEPARATOR STBY PACK TEMP CONT VALVE PACK TEMP CONT VALVE RIGHT BLEED AIR BLEED AIR TO MIX MANIFOLD RAM AIR PACK VALVE LEFT BLEED AIR TO TRIM AIR SYSTEM CONDITIONED AIR COLD AIR HEAT EXCHANGER COOLED AIR BLEED AIR AIR CYCLE MACHINE R ELECTRONIC CONTROLLER L ELECTRONIC CONTROLLER L PRIMARY PACK CONTROL L PRIMARY PACK CONTROL R RAM AIR CONTROL L RAM AIR CONTROL L STBY PACK CONTROL R STBY PACK CONTROL

.

C W

.

C W 0FF 0FF CONT CAB AUTO FWD CAB AUTO

.

C W 0FF AFT CAB AUTO

.

(6)

Air Conditioning Distribution Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

.

CONDITIONED AIR BLEED AIR ELECTRIC FANS TRIM AIR MODULATING VALVES L PACK PACKR TRIM AIR PRESSURE REGULATOR & SHUTOFF VALVE GROUND PRECONDITIONED AIR TRIM AIR

CONT CAB FWD CAB AFT CAB

OFF ON L ELECTRONIC CONTROLLER AFT CAB ZONE TEMP CONTROL BACK-UP FLIGHT DECK ZONE TEMP CONTROL R ELECTRONIC CONTROLLER FWD CAB ZONE TEMP CONTROL PRIMARY FLIGHT DECK ZONR TEMP CONTROL ZONE

TEMP TEMPZONE TEMPZONE

MIXED MANIFOLD

CONDITION:

IN FLIGHT PACKS ON

(7)

Cabin Pressure Control System Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

RECIRC FAN OFF AUTO R RECIRC FAN OFF AUTO F L T G R D AUTO

FAIL OFF SCHEDDESENT STANDBY MANUAL

CONDITIONED AIR FROM OVERHEAD AND SIDEWALL OUTLETS

AIRPLANE ALTIMETERS BARO SET CABIN SENSE PORT STATIC PORTS NEGATIVE PRESSURE RELIEF FORWARD OUTFLOW SENSOR DC AC

AUTO TRANSFER TO STBY

ADC CAPT F/O MAIN OUTFLOW VALVE PRESSURE RELIEF AT 8.65 PSI AIR/GROUND SAFTY SENSOR 737-400 CONDITION:

(8)

Anti-Ice Components Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

FLIGHT DECK WINDOWS WINDOW HEAT WINDSHIELD WIPERS RAIN REPELENT ELEVATOR PITOT PROBES (2 PLACES)

ANGLE AIRFLOW SENSOR (2 PLACES)

TEMPERATURE PROBE

PITOT STATIC PROBE (4 PLACES)

ENGINE COWL LIP LEADING EDGE SLATS

(9)

Engine Anti-Ice System Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

BLEED AIR ENGINE COWL ANTI-ICE (TAI) ENGINE BLEED VALVE HIGH STAGE VALVE TO PNEUMATIC SYSTEM 5 TH 9 TH COWL ANTI-ICE VALVE

ENG

ANTI-ICE

1

2

OFF ON COWL VALVE

OPEN COWL VALVEOPEN

COWL

ANTI-ICE ANTI-ICECOWL

.

(10)

Wing Anti-Ice System Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

WING ANTI-ICE

OFF ON

L VALVE

OPEN R VALVEOPEN

BLEED AIR THRUST ABOVE T. O. WARNING BELOW T. O. WARNING RIGHT MAIN LANDING GEAR WING ANTI-ICE CONTROL VALVE LEADING EDGE SLATS

PNEUMATIC MANIFOLD HIGH TEMP LOW TEMP TELESCOPING DUCT

WING DISTRIBUTION DUCT

THERMAL SWITCH GROUND

AIR

CONDITION:

ON THE GROUND WING ANTI-ICE ON ENGINES AT IDLE THRUST DUCT TEMP LOW

.

(11)

Electrical Power Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

R I S E G E N D R I V E O I L T E M P º C I N 1 6 0 3 0 2 0 1 0 0 8 0 1 2 0 4 0 R I S E G E N D R I V E O I L T E M P º C I N 1 6 0 3 0 2 0 1 0 0 _{8 0} 1 2 0 4 0 STANDBY POWER DRIVE TEMP DISCONECT DISCONECT LOW OIL

PRESSURE PRESSURELOW OIL

HIGH OIL PRESSURE STANDBY PWR OFF HIGH OIL TEMP DRIVE CAN BE RECONNECTED ONLY ON GRD BAT OFF AUTO

RISE IN A M P E R E S A C 5 0 1 0 0 150 0 A M P E R E S A C 5 0 1 0 0 150 0 BUS TRANS

GEN 1 APU GEN GEN 2

GRD PWR OFF OFF ON ON ON OFF O F F A U T O TRANSFER

BUS OFF TRANSFERBUS OFF

BUS OFF BUS OFF GEN OFF BUS GEN OFF BUS APU GEN OFF BUS GRD POWER AVAILABLE EXTERNAL AC BUS GENERATOR BUS 1 TR 1 TR 2 GEN APU INW 115v AC GND SERVICE BUS GENERATOR DRIVE & STANDBY POWER PANEL GND SERVICE RELAY NORMAL APU START NORMAL ALTERNATE ALTERNATE TRANSFER RELAY 1 TRANSFER RELAY 2 TR3 DISCONNECT RELAY BUS SWITCHING 115v AC GND MAIN BUS 1 115v AC TRANSFER BUS 1

AC STANDBY BUS DC STANDBY BUS

DC BUS 1 DC BUS 2 BATTERY BATT CHGR GENERATOR BUS 2 115v AC TRANSFER BUS 2 BATTERY BUS

HOT BATTERY BUS

SWITCHED HOT BAT BUS EXTERNAL DC RECEPTACLE 115v AC MAIN BUS 2 TR 3

º

_ºº

º

º º

º

ºº

GEN DRIVE GEN

DRIVE GEN₁ GEN₂

CONDITION: INFLIGHT

BATTERY SWITCH ON

STANDBY POWER SWITCH AUTO

BUS TRANSFER SWITCH AUTO

ENGINE GENERATOR CONNECTED TO RESPECTIVE BUS

.

_.

.

(12)

AC Power Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

GEN DRIVE GEN 2 OFF ON GEN

DRIVE GEN₁ GEN APU

GRD PWR

GEN 1 APU GEN GEN 2

GROUND SERVICE APU OFF ON GRD POWER AVAILABLE

º

OFF ON OFF ON EXTERNAL AC BUS

GENERATOR BUS 1 GENERATOR BUS 2

115v AC GND

SERVICE BUS MAIN BUS 1115v AC

115v AC MAIN BUS 2 115v AC TRANSFER

BUS 1 115v AC TRANSFER_{BUS 2}

GND SERVICE

RELAY _ALTERNATE

ALTERNATE TRANSFER

RELAY 1 TRANSFER_{RELAY 1}

NORMAL NORMAL

CONDITION: INFLIGHT

BATTERY SWITCH ON

ENGINE GENERATOR CONNECTED TO RESPECTIVE BUS

(13)

Electrical Power Controls & Monitoring Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

GEN

DRIVE

GEN

2

GENERATOR BUS 1 GENERATOR BUS 2

115v AC TRANSFER BUS 1 115v AC TRANSFER BUS 2 DC BUS 2 FAN AIR R I S E G E N D R I V E O I L T E M P º C I N 1 6 0 3 0 2 0 1 0 0 8 0 1 2 0 4 0 5 0 D O 5 0 0 A M P S 2 0 D C V O LT S 4 0 0 1 2 0 V O LT S 3 0 0 100 130 1 2 0 V O LT S 3 0 0 100 130 A M P E R E S A C 5 0 1 0 0 150 0 B U S T R A N S G E N 2 D R I V E T E M P R I S E I N 2 D R I V E C A N B E R E C O N N E C T E D O N LY O N G R D D I S C O N N E C T O F F O N O F F A U T O TRANSFER BUS OFF LOW OIL PRESSURE HIGH OIL TEMP BUS OFF GEN OFF BUS VOLT REG FROM GENERATOR 1 TR 2 TR 1 TR 2 TR 3 TEST BAT BAT BUS STBY PWR APU GEN GEN 2 INV TEST GEN 1 GRD PWR STBY PWR

.

. .

.

(14)

DC Power System Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

B U S T R A N S O F F A U T O BATTERY 115v AC GROUND SERVICE BUS

SWITCHED HOT BAT BUS

BATTERY SWITCH TR 3 DISCONNECT RELAY EXTERNAL DC RECEPTACLE 115v AC MAIN BUS 2 115v AC TRANSFER BUS 1 115v AC TRANSFER BUS 2 DC BUS 1 DC BUS 2 BATTERY BUS TO APU STARTER ALTERNATE OFF ON HOT BATTERY BUS

BATTERY BUS CONTROL BATT CHGR TR 1 TR 2 _{TR 3}

BATTERY OFF AUTO STANDBY POWER SWITCH

º º

.

NORMAL CONDITION: INFLIGHT BATTERY SWITCH ON

GENERATOR BUSSES POWERED

.

(15)

Standby Power System Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

BATTERY

TRANSFER BUS NO. 1

DC BUS NO. 1 DC STANDBY BUS DC STANDBY BUS DC STANDBY BUS AC STANDBY BUS AC STANDBY BUS AC STANDBY BUS BATTERY BUS BATTERY BUS T R STANDBY POWER STANDBY POWER BAT BAT OFF BAT ON OFF DAT ON OFF OFF ON ON AUTO BAT OFF AUTO BAT OFF AUTO BAT OFF OR STANDBY POWER 1

HOT BATTERY BUS

CONDITION: INFLIGHT OR ON THE GROUND

BATTERY SWITCH ON

STANDBY POWER SWITCH AUTO GENERATOR BUSSES POWERED

CONDITION: INFLIGHT OR ON THE GROUND

BATTERY SWITCH ON or OFF

STANDBY POWER SWITCH BAT

GENERATOR BUSSES POWERED OR NOT POWERED CONDITION: INFLIGHT

BATTERY SWITCH ON

STANDBY POWER SWITCH AUTO GENERATOR BUSSES POWERED

INV INV

(16)

Power Plant Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

ACCESSORIES OIL PUMP FUEL PUMPS GENERATOR GENERATOR DRIVE STARTER TACHOMETER HYDRAULIC PUMP BOOSTERS FAN THRUST REVERSER TURBINES FAN AIR 5TH STAGE BLEED AIR ENGINE IDLE CONTROL POWER MANAGEMENT CONTROL FLT DECK CONTROLS & INDICATORS ENGINE FUEL SYSTEM AIR DRIVEN STARTER FROM PNEUMATIC SYSTEM FROM FUEL SYSTEM FROM ENGINE INDICATING SYSTEM FROM ELECTRICAL SYSTEM ENGINE START

& IGNITION SYSTEM

9TH STAGE BLEED AIR

COMBUSTER

(17)

Engine Fuel & Oil System Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

TO BEARINGS & GEARBOX COMBUSTOR FUEL FLOW TRANSMITTER FUEL FILLTER FUEL FILLTER FUEL /OIL HEAT EXCHANGE FIRST STAGE FUEL PUMP ENGINE FUEL SHUTOFF VALVE FUEL HEATER

FROM FUEL TANK FUEL OIL M E C MEC FUEL SHUTOFF VALVE OIL FILTER OIL TANK OIL PUMP OIL RETURN SCAVENGER PUMPS SCAVENGER FILTER C C OIL QUANT OIL QUANT FUEL FLOW LOW OIL PRESSURE FILTER BYPASS FUEL VALVE CLOSED OIL FILTER BYPASS IDLE CONTROL PMC OIL PRESS

(18)

ACTUATOR

Thrust Reverser Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

REVERSE THRUST (STOWED) REVERSED THRUST (DEPLOYED)

SYSTEM A SYSTEM B STANDBY SYSTEM ENGINE 2 SYSTEM B HYDRAULIC PRESSURE

TRANSLATING SLEEVE TRANSLATING SLEEVE

BLOCKER DOOR FAN FLOW

FAN FLOW

CASCADE VANES CASCADE VANES

ISOLATED VALVE (CLOSED)

DETENT NO. 2 DETENT NO.1

MAXIMUM RESERSE THRUST

STOWED FORWARD THRUST LEVER ISOLATED VALVE (OPEN) CONTROL VALVE (STOW) CONTROL VALVE (DEPLOY) ENGINE 2 SYSTEM B HYDRAULIC PRESSURE SYSTEM A SYSTEM B STANDBY SYSTEM ACTUATOR DEPLOY STORED & LOCKED

(19)

Engine Fire Extinguisher Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

1

2

DISCH L R DISCH L R LEFT FIRE BOTTLE LEFT BOTTLE

DISCHARGE RIGHT BOTTLEDISCHARGE

RIGHT FIRE BOTTLE

(20)

Flight Control Surfaces Location

Boeing 737

-300/400/500

Southeast Flight Support

SFS

FLIGHT SPOILERS GROUND SPOILERS TRAILING EDGE FLAPS AILERONS ELEVATOR RUDDER STABILIZER SLATS FLAPS

(21)

Roll Control Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

.

_.

2 3 6 7 AILERON AILERON TRIM SPOILER MIXER AILERON FEEL & CRNTERING

UNIT _{FLIGHT SPOILERS}

SPOILER A B OFF ON OFF ON

AILERON TRANSFER MECHANISM

.

_.

(22)

Pitch Control Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

MATCH TRIM FAIL FEEL DIFF PRESS STABILIZER TRIM STABILIZER POSITION LEFT PITOT PROBE A B RIGHT PITOT PROBE ELEVATOR FEEL & CENTERING UNIT

SPEED TRIM FAIL

AIR DATA COMPUTER

MACH TRIM ACTUATOR FLIGHT CONTROL COMPUTER ELEVATOR FEEL COMPUTER

.

(23)

Speed Brakes Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

SPOILER A B OFF ON OFF ON

.

1 2 4 5 6 7 8 9 A SPOILER MIXER RIGHT MAIN LANDING GEAR FLIGHT SPOILERS: 2, 3, 6, 7 GROUND SPOILERS: 0, 1, 4, 5, 8, 9 SPEED BRAKE ARMED FLIGHT DETENT UP SPEED BRAKE LEVER SPEED BRAKE DO NOT ARM SPEED BRAKE ARM GROUND SPOILER BYPASS VALVE GROUND SPOILER CONTROL VALVE 0 3 B

(24)

.

Leading Edge Devices & Trailing Edge Flaps Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

D O W N A LT E R N AT E F L A P S U P O F F O F F A R M

.

AUTO SLAT CONTROL LE CONTROL STBY RES TE FLAP CONTROL TE DRIVE UNIT AIR DATA COMPUTER FLAP LOAD RELIEF COMPARATOR SWITCH TE FLAPS TE FLAP BYPASS VALVE FROM SYS B RESERVOIR PTU SYS A SYS B M L R SLATS FLAPS FLAPS SLATS 3 4 4 5 6 1 2 3 1 2 M

.

1 2 ₅ 10 15 25 30 4O UP FLAPS L

(25)

Pilot-Static System Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

AIR DATA COMPUTER NO. 1 STANDBY PNEUMATIC AIRSPEED ALTIMETER ELECTRIC MACH AIRSPEED ELECTRIC MACH AIRSPEED ELECTRIC ALTIMETER ELECTRIC ALTIMETER INERTIAL VERTICLE SPEED INERTIAL VERTICLE SPEED AIR DATA COMPUTER NO. 2 PRESSURIZATION CONTROL CAPT STATIC

NO. 1 AUX STATIC

NO. 1 AUX PITOT F/O PITOT CAPT PITOT

NO. 2 AUX PITOT

PITOT CAPT & F/O STATIC NO. 1 & NO. 2 AUX STATIC ALTERNATE STATIC

ALTERNATE STATIC

NO. 2 AUX STATIC F/O STATIC CABIN ALTIMETER AND DIFFERENTIAL PRESSURE PRESSURIZATION CONTROL

(26)

Fuel Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

CENTER

TANK

TO APU CENTER TANK SCAVENGE JETPUMP APU FUEL SHUTOFF VALVE APU BYPASS VALVE BYPASS VALVE ENGINE FUEL SHUTOFF VALVE FUEL SCAVENGE SHUTOFF VALVE FUELING STATION MANUAL DEFUELING VALVE ENGINE DRIVEN FUEL PUMP C C 0

NO. 1

TANK

NO. 2

TANK

.

O 20 20 40 + + 40 FUEL TEMP CROSS FEED FUEL PUMPS OFF ON PUMPSFUEL L R CTR 1 0 2 AFT FWD FWD AFT FUEL VALVE

CLOSED FUEL VALVECLOSED

FILTER

BYPASS BYPASSFILTER

LOW

PRESSURE PRESSURELOW

LOW PRESSURE LOW

PRESSUREPRESSURELOW

LOW PRESSURE VALVE OPEN OFF ON

(27)

Engine Start & Ignition System Schematic

Boeing 737

-300/400/500

Southeast Flight Support

SFS

º º

º

_º

º

º º

º

_º

º

º ºº

º

OFF FLT GRD CONT

ENGINE START

BOTH IGN L IGN R BATTERY BUS MEC AC TRANSFER BUS AC STANDBY BUS START VALVE OPEN AIR DRIVEN STARTER CUTOFF IDLE COMBUSTOR BLEED AIR FUEL START VALVE STARTER CUTOUT SWITCH SWITCH HOLDING RELAY FROM PNEUMATIC SYSTEM LEFT IGNITER RIGHT IGNITER FROM FUEL SYSTEM ENGINE BLEED AIR VALVE GDR GDR GDR IGN L IGN R OFF OFF OFF CONT CONT CONT BOTH BOTH IGN R HIGH N LOW N FLT FLT FLT 2 2

º

Z Z CONDITION:

ENGINE BEING STARTED

N2 ROTATION BELOW STARTER CUTOUT SPEED

(28)

Yaw Control Schematic (after RSEP modification)

Boeing 737

-300/400/500

Southeast Flight Support

SFS

.

RUDDER TRIM RUDDER FEEL & CENTERING UNIT YAW DAMPER COUPLER RUDDER PCU RPR FFM RPL OFF ON

YAW DAMPER

YAW DAMPER CONTROL VALVE STANDBY HYD PUMP STANDBY HYD AOTO-ON LOGIC CONTROL VALVE RUDDER STANDBY A B YAW DAMPER STANDBY RUDDER PCU STANDBY RUDDER SHUTOFF VALVE

(29)

Standby Hydraulic System (before RSEP modification)

and (after RSEP modification)

Boeing 737

-300/400/500

Southeast Flight Support

SFS

STBY RUD OFF A ON OFF OFF ARM UP DOWN STBY RUD OFF B ON

FLT CONTROL

A

B

ALTERNATE FLAPS

STANDBY

HYD

LOW QUANTITY LOW PRESSURE LOW PRESSURE LOW PRESSURE

mn

º

TO THRUST RESERSERS FROM SYSTEM B RESERVOIR STBY RES TRAILING EDGE DRIVE UNIT TRAILING EDGE FLAP BYPASS VALVE STANDBY RUDDER SHUTOFF VALVE FLIGHT CONTROL SHUTOFF VALVE FLIGHT CONTROL SHUTOFF VALVE A B B M ELEVATOR & ELEVATOR FEEL COMPUTER AILERON RUDDER TO EXTEND L.E. DEVICES