OPERATIONS PROCEDURES
ATA 24 – ELECTRICAL POWER
ATA CHAPTER 1
ITEM
2 - REPAIR INTERVAL CATEGORY 3 - NUMBER INSTALLED
4 - NUMBER REQUIRED FOR DISPATCH 5 - REMARKS OR CONDITIONS AC
21-1 Inverter A 2 1 * Inverter #2 only may be inoperative, provided:
(a) For day VMC flight only, and
(b) AP use is prohibited below 1000 ft AGL, and (c) Operations are limited to not more than two
calendar days
(d) TLU manual mode is operative
21-2 INV FAULT alert C 2 0 * (o) May be inoperative provided affected inverter is
checked operative prior to each departure
21-3 AC Bus Tie Contactor B 1 0 * May be inoperative provided DC generation Bus Tie
Contactor is considered inoperative,
refer to item 32-2
21-4 BUS OFF alert C 2 0 *
ACW
22-1 ACW generator channel
(generator + related GCU) B 2 1 * (o) (m) One may be inoperative provided: (a) HYD AUX pump is operative, and
(b) Two engines taxi is performed, and (c) Aircraft is not operated on narrow runways
(width < 30 m (98 ft)), and
(d) Aircraft is not operated into known or forecast icing conditions, and
(e) AFM penalties are applied, and
(f) Ground operations above 8500 ft (when authorized), including taxi, do not exceed 10 minutes
22-2 ACW GEN FAULT alert C 2 1 * One may be inoperative provided ACW BTC
operates normally 22-3 ACW generation Bus Tie
Contactor B 1 0 * (o) May be inoperative in the ISOL position, provided: (a) Both ACW generator channels are operative,
and
(b) HYD X FEED is operative and is selected ON before take off, then OFF during cruise and re- selected ON before landing
ATR 72-600 MEL
DATE :SEP 15,2012 REVISION:00 PAGE:2-24-2
ATR72-600
MINIMUM EQUIPMENT LIST
MEL 24
Rev. 00 2-24-2
2012 SEP 15
ATA 24 – ELECTRICAL POWER (Continued)
ATA CHAPTER 1
ITEM
2 - REPAIR INTERVAL CATEGORY 3 - NUMBER INSTALLED
4 - NUMBER REQUIRED FOR DISPATCH 5 - REMARKS OR CONDITIONS DC
30-1 DC generator channel
(generator + related GCU) A 2 1 * (o) (m) May be inoperative provided: (a) TRU is checked operative prior to each
departure, and
(b) Two engines taxi is performed, and
(c) Aircraft does not line up until 6 minutes elapsed after operative generator comes on line, and (e) Operations are limited to not more than two
calendar days 30-2 Transformer Rectifier Unit
(TRU) B 1 0 * (o) May be inoperative.
32-1 DC GEN FAULT alert C 2 1 * Provided DC Bus Tie Contactor is operative
32-2 DC generation Bus Tie
Contactor (BTC) B 1 0 * (o) May be inoperative in the ISOL position, provided: (a) Both DC generator channels are operative, and
(b) DC BUS OFF lights are operative, and (c) Both inverters are operative, and
(d) HYD X FEED is operative and is selected ON before take off, then OFF during cruise and re- selected ON before landing
32-3 SVCE & UTLY BUS control
system C 1 0 * May be inoperative in the OFF position
32-4 DC BUS OFF alert C 2 0 *
Miscellaneous 41-1 AC external power connection system C 1 0 * 46-1 DC external power connection system C 1 0 * 69-1 DC AMP indicator
ATR 72-600 MEL
DATE:SEP 15,2012 REVISION:00 PAGE: 2-24-1A
Operation Procedures
2-24-1A242 0 1 2 S E P 1 5
ATA 24 – ELECTRICAL POWER
21-2 – INV FAULT alert
OPERATIONAL PROCEDURES
After engines start select BTC ISOL. Check no amber light or flag on instruments come on. 22-1 – ACW generator channel (generator + related GCU)
OPERATIONAL PROCEDURES
If accelerate stop has to be performed, EMER BRAKING has to be used.
Refer to AFM Supplement N°01 7_02.01: Dispatch with one ACW generator channel inoperative. 22-3 – ACW generation Bus Tie Contactor
OPERATIONAL PROCEDURES
Open hydraulic X FEED before take off Close it after flaps retraction
Open it in approach Close it after landing
Note: Two-engine taxi is recommended.
30-1 – DC generator channel (generator + related GCU)
OPERATIONAL PROCEDURES
Check of remaining generator feeder integrity :
6 minutes are necessary to establish the temperature difference between the feeders if one line is broken. So aircraft should not line up until 6 minutes elapsed after operative generator comes on line. Operational test of TRU:
Note: During the test, the ACW electrical network must be available (The AC GPU connected or ACW generators running)
Checking are performed only on Main Electrical Panel (left hand panel) - Switch OFF the pushbutton DC EXTERNAL POWER (if selected ON) - Switch OFF the pushbuttons DC GEN 1 & 2 (if selected ON).
On Main Electrical Panel; check that the following caution lights are switched ON: - BATTERY ARROW S,
- Both BUS OFF, - INVERTER 2 FAULT, - Both DC BUS OFF,
- SHED LEGEND OF DC SVCE/UTLY BUS Check that the following systems are supplied:
- VHF 1,
- FUEL QTY INDICATOR, - FLAPS POSITION INDICATOR
On Main Electrical Panel; press the TRU push-button; then check that: - The TRU push-button is switched ON,
- The TRU ARROW caution light is switched ON,
- The BATTERIES ARROWS caution lights are not illuminated, - The UNDV legend of OVRD/UNDV push-button is not illuminated.
On Main Electrical Panel, check that the BATTERY AMMETER shows zero load either if BAT selector switch is placed in EMER or MAIN position.
Check that the following systems are still supplied: - VHF 1,
- FUEL QTY INDICATOR, - FLAPS POSITION INDICATOR.
On Main Electrical Panel, switch off the TRU push-button; then check that: - The TRU push-button is not illuminated,
- The TRU ARROW caution light is not illuminated, - The BATTERY ARROWS caution lights are switched ON
ATR 72-600 MEL
DATE:SEP 15,2012 REVISION:00 PAGE: 2-24-2A
Operation Procedures
3-24-2A242 0 1 2 S E P 1 5
ATA 24 – ELECTRICAL POWER (Continued)
30-2 – Transformer Rectifier Unit (TRU)
OPERATIONAL PROCEDURES
In case of DUAL DC GEN LOSS the following procedure has to be applied:
DC GEN 1 AND 2...OFF THEN ON If no generator recovered
LAND ASAP, flight under IMC must be limited to 30 minutes
BAT SW ... OVRD Note: If after a restart, a DC GEN becomes operative, set BAT SW to ON.
CAPT EHSI ... OFF MAN RATE KNOB ... 9 O'CLOCK CAB PRESS MODE SEL ... MAN ATC (VHF 1 or HF or HF 2) ... NOTIFY MIN CAB LT ... OFF Note: NAV lights switch set to ON is necessary to provide IEP illumination.
STICK PUSHER / SHAKER... OFF STICK PUSHER / SHAKER FAULT procedure ...APPLY SIDE WINDOWS ANTI-ICING ... OFF AVIONICS VENT EXHAUST MODE ... OVBD ADC SW ... SET TO ADC 1 ATC SW ... SET TO ATC 1 TLU... MAN MODE LO SPD
When TLU LO SPD illuminates
TLU ... AUTO
CAUTION: Avoid large rudder input if IAS above 180 kt
MAIN BATTERY CHARGE (on LH maintenance panel) ...CHECK BUS EQUIPMENT LISTS ...CHECK
If STBY UNDV light illuminates
STBY BUS... For approach, OVRD only when necessary Before descent
PAX INSTRUCTIONS ...USE PASSENGER ADDRESS At touch down
IDLE GATE LEVER ... PULL
32-2 – DC generation Bus Tie Contactor
OPERATIONAL PROCEDURES
Note: Two-engine taxi is recommended.
CAUTION: While aircraft is on ground, if LH DC generator fails, then automatic pressurization digital controller supplied by DC BUS 1 is lost. Therefore, both outflow valves will close and aircraft will be pressurized. In this case, use manual pressurization to depressurize the aircraft.
ATR 72 - 600
DATE: SEP 15, 2012 REVISION:0.0 PAGE:2-25-1
ATR72-600
MINIMUM EQUIPMENT LIST
MEL 25 Rev. 00 2-25-1 2012 SEP 15 ATA 25 – EQUIPMENT ATA CHAPTER 1 ITEM
2 - REPAIR INTERVAL CATEGORY 3 - NUMBER INSTALLED
4 - NUMBER REQUIRED FOR DISPATCH 5 - REMARKS OR CONDITIONS
Note: A seat with an inoperative or missing seat belt or harness is considered inoperative. 11-1 Flight Crew Seat
(1) Horizontal adjustment
B 2 2 * Vertical and recline adjustments may be inoperative provided associated seat is secured or locked in a position acceptable to the flight crew member
Note: If an inoperative armrest will hinder an emergency evacuation or any other flight duties, it should be removed.
Must be operative for each flight crew member 11-2 Flight deck Observer Seat D 1 0 * May be inoperative provided the seat is correctly
stowed 12-1 Flight Deck Sun Visors C
C 2
2 0
0
* (m) May be inoperative provided affected sun visor is removed
May be inoperative provided affected sun visor does not obstruct either pilot’s field of view for take-off or landing.
21-1 Required Cabin Attendant
Seat B 2 1 * (o) (m) One seat or seat assembly may be inoperative, provided: (a) Inoperative seat or seat assembly is not
occupied, and
(b) Cabin attendant displaced by inoperative seat occupies the adjacent cabin attendant seat or the passenger seat most suitable to perform assigned duties, and
(c) Passenger Address is operative and used to communicate with displaced cabin attendant, and (d) One cabin attendant occupies a seat with a direct
access to the communication system, and (e) Folding type seat is stowed and secured in the
retracted position, and
(f) Where a passenger seat is assigned to the displaced cabin attendant it is placarded “FOR CABIN ATTENDANT USE ONLY”, and (g) Alternate normal, following failure and
emergency procedures are established / approved and used for displaced cabin attendant
Note: This requirement does not preclude use of passenger seats by cabin attendants carried in excess of the required cabin attendant.
ATR 72 - 600
DATE: SEP 15, 2012 REVISION:0.0 PAGE:2-25-2
ATR72-600
MINIMUM EQUIPMENT LIST
MEL 25 Rev. 00 2-25-2 2012 SEP 15 ATA 25 – EQUIPMENT ATA CHAPTER 1 ITEM
2 - REPAIR INTERVAL CATEGORY 3 - NUMBER INSTALLED
4 - NUMBER REQUIRED FOR DISPATCH 5 - REMARKS OR CONDITIONS
31-1 Passenger Seats D 70 - * (m) One or more may be inoperative, provided the inoperative seat:
(a) Does not block an emergency exit, and (b) Does not restrict any passenger from access to
the main aircraft aisle, and
(c) Is blocked and placarded “DO NOT OCCUPY” Note: A seat with an inoperative or missing seat belt is
considered inoperative.
Note: Any damage to passenger seats and components must not be detrimental to passenger safety.
Note: The seatback(s) where are located at the aisle cannot be upright position are considered the (b) restriction and the effective area seat(s) shall be BLOCKED.
31-2 Baggage Bar D 35 0 * (o) May be inoperative provided:
a) Baggage is not stowed under seat with inoperative restraining bar,
b) Associated seat is placarded, “DO NOT STOW BAGGAGE UNDER THIS SEAT”, and
c) Procedures are established to alert Cabin Crew of inoperative restraining bar.
32-1 Passenger Seats-Tray table
in unstowed position
32-2 PAX in-arm table
D D 66 4 0 0
* (m) May be inoperative or removed provided: a) The affected tray table does not block an
emergency exit,
b) The affected tray table does not restrict any passenger from access to the main aircraft aisle, and
c) The affected seat (s) are blocked and placarded
“DO NOT OCCUPY
Note: The table(s) where are located at the aisle cannot be in stowed position are considered the (b) restriction and the window seat(s) shall be BLOCKED.
ATR 72 - 600
DATE: SEP 15, 2012 REVISION:0.0 PAGE:2-25-3
ATR72-600
MINIMUM EQUIPMENT LIST
MEL 25 Rev. 00 2-25-3 2012 SEP 15 ATA 25 – EQUIPMENT ATA CHAPTER 1 ITEM
2 - REPAIR INTERVAL CATEGORY 3 - NUMBER INSTALLED
4 - NUMBER REQUIRED FOR DISPATCH 5 - REMARKS OR CONDITIONS
33-1 Lavatory (Toilet) C 1 0 * (o) (m) May be inoperative provided
a) waste is drained and system inspected for leakage,
b) procedures are establish to deactivate system components, and
c) Lavatory is used only by crewmembers, and d) lavatory door is locked closed and placarded,
“DO NOT OCCUPY
e) each flight shall not be excessed 70 mins flight time.
NOTE: These provisos are not intended to prohibit lavatory inspections by crewmembers.
34-1Exterior Lavatory Door Ashtrays
A 1 0 May be missing.
Repairs are made within 10 calendar days
35-1 Lavatory Attendant Call C 1 0 * (o) (m) May be inoperative
36-1 Lavatory Waste
Receptacle Access Door
C 1 0 * (o) (m) May be inoperative provided:
a) Associated waste container is empty,
b) The lavatory is considered inoperative. Ref MEL 25-33-1
40-1 Flashlights (Torches) C 4 0 * (o) May be inoperative provided each required crew member assigned to affected position has an operative flashlight (torch).
44-1