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A
747-400
MAINTENANCE MANUAL
C. Access
(1) Location Zones
117 Electrical & Electronics Compartment, L.H.
412 Engine 1
422 Engine 2
432 Engine 3
442 Engine 4
(2) Access Panels
117A Door - Access - Electronics Compartment
415 Left Thrust Reverser Half - Engine 1
416 Right Thrust Reverser Half - Engine 1
417 Left Core Cowl - Engine 1
418 Right Core Cowl - Engine 1
425 Left Thrust Reverser Half - Engine 2
426 Right Thrust Reverser Half - Engine 2
427 Left Core Cowl - Engine 2
428 Right Core Cowl - Engine 2
435 Left Thrust Reverser Half - Engine 3
436 Right Thrust Reverser Half - Engine 3
437 Left Core Cowl - Engine 3
438 Right Core Cowl - Engine 3
445 Left Thrust Reverser Half - Engine 4
446 Right Thrust Reverser Half - Engine 4
447 Left Core Cowl - Engine 4
448 Right Core Cowl - Engine 4
D. Prepare for the Procedure
S 862-013
CAUTION: AT EACH ENGINE POSITION, MAKE SURE THE TYPE OF FIRE
_______ DETECTION CARD (SYSTRON DONNER OR KIDDE) INSTALLED IN THE M826 PANEL IS THE SAME AS THE TYPE OF FIRE DETECTION ELECMENT INSTALLED ON THE ENGINE. IF THIS IS NOT DONE DAMAGE TO EQUIPMENT MAY OCCUR.
(1) Open these circuit breakers.
(a) P6 Main Power Distribution Panel 1) 6C1 ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 1 2) 6C2 ALTN PWR ENG FIRE/OVTH DET LOOP A ENG 2 3) 6C3 ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 3 4) 6C4 ALTN PWR ENG FIRE/OVHT DET LOOP A ENG 4 5) 6G10 ENG FIRE/OVHT DET ENG 2 LOOP A 6) 6G11 ENG FIRE/OVHT DET ENG 2 LOOP B 7) 6G12 ENG FIRE/OVHT DET ENG 4 LOOP A 8) 6G13 ENG FIRE/OVHT DET ENG 4 LOOP B 9) 6H10 ENG FIRE/OVHT DET ENG 1 LOOP A 10) 6H11 ENG FIRE/OVHT DET ENG 1 LOOP B 11) 6H12 ENG FIRE/OVHT DET ENG 3 LOOP A
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747-400 MAINTENANCE MANUAL
12) 6H13 ENG FIRE/OVHT DET ENG 3 LOOP B
S 012-014
WARNING: YOU MUST OPEN THE THRUST REVERSER BEFORE YOU OPEN THE CORE COWL
_______ TO PREVENT DAMAGE TO THE REVERSER OR THE COWL. MAKE SURE YOU FOLLOW THE PROCEDURE IN 78-31-00/201 WHEN YOU OPEN THE THRUST REVERSER. IF YOU DO NOT FOLLOW THIS PROCEDURE, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(2) Open the applicable thrust reverser half and core cowl half to get access to the engine strut (AMM 78-31-00/201 and AMM 71-11-06/201).
S 012-002
CAUTION: DO NOT DISCONNECT THE WIRE INTEGRATION UNIT WAFER CONNECTOR.
_______ IF THE WAFER CONNECTOR IS DISCONNECTED, AN OPERATIONAL TEST OF EVERY SYSTEM THAT PASSES THRUGH THAT WIRE INTEGRATION UNIT WAFER CONNECTION MUST BE PERFORMED.
(3)
Gain access to the fire detection card file M826 in the
electrical/electronics equipment compartment.
E.
Reconfigure the Engine Fire Detection System from Systron Donner to Kidde
S 022-039
(1) Remove the control cards for the affected engine (AMM 26-10-01/401).
-
Set # 1 for engine 1: YLPA001, YLPA002, YLPA004, YLPA005
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Set # 2 for engine 2: YLPA006, YLPA007, YLPA009, YLPA010
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Set # 3 for engine 3: YLPA011, YLPA012, YLPA014, YLPA015
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Set # 4 for engine 4: YLPA016, YLPA017, YLPA019, YLPA020
S 962-015
(2) Find the connector shown below, on the fire detector card file, M826 and make the wire change for the engine position being changed.
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