28-25-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F.
G.
H.
A
747-400 MAINTENANCE MANUAL
Procedure S 366-067
(1) Operate the APU for 30 minutes (AMM 49-11-00/201).
(2) S 366-068After 30 minutes open the SHROUD DRAIN APU FUEL drain valve.
(3) S 366-069Do a fuel leakage check for the APU fuel-feed line.
(4) S 366-070After the leakage check, stop the APU (AMM 49-11-00/201).
APU Fuel-Feed Line Leak Limits
S 366-071
(1)
If the fuel leakage rate is not more than 60 drops (3 ml), then do these steps:
(a)
Put the airplane back to the usual condition.
(b)
Continue with the usual in-service operation of the APU.
(c)
Do the operational leak check of the APU fuel-feed line daily until you repair or replace the APU fuel hose (AMM 28-25-01/401).
S 366-072
(2)
If the fuel leakage rate is more than 60 drops (3 ml), then do these steps:
(a)
Put the airplane back to the usual condition.
(b)
Fully drain the APU fuel supply line until the repair is possible (AMM 28-25-04/401).
(c)
Deactivate the APU.Put the Airplane Back to the Usual Condition
S 086-073
WARNING:_______OBEY THE REMOVAL PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(1)
Remove the door locks (AMM 32-00-30/201).
S 866-074
(2)
Remove the electrical power if it is not necessary for subsequent tasks (AMM 24-22-00/201).
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A
747-400 MAINTENANCE MANUAL
APU FUEL BOOST PUMP - REMOVAL/INSTALLATION
__________________________________________
1. General
_______
A. This procedure has two tasks
(1)
A task to remove the APU fuel boost pump.
(2)
A task to install the APU fuel boost pump.
TASK 28-25-01-004-001
2. APU Fuel Boost Pump Removal (Fig. 401)
___________________________
A. Equipment
(1)
Container - 1 U.S. quart capacity, to catch fuel
B.
References
(1)
AMM 32-00-30/201, Landing Gear Door Locks
(2)
AIPC 28-25-01 Fig. 2
(3)
SSM 28-25-01
(4)
WDM 28-25-11
C.
Access
(1)
Location Zone 571 Rear Spar to Landing Gear Support Beam, Left
D.
Procedure
S 864-002
(1) Make sure the ground locks landing gear are installed.
S 494-003
WARNING: USE THE PROCEDURE IN AMM 32-00-30/201 TO INSTALL THE DOOR
_______ LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
Install the wing and body gear door locks (AMM 32-00-30/201).
S 864-004
(3)
Make sure the APU control switch on the P5 pilots' overhead panel is at the STOP position. Attach a DO-NOT-OPERATE tag to the switch.
S 864-005
(4)
Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a)
P6 Main Power Distribution Panel
1) 6H18, DC FUEL PUMP APU
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