28-25-05
ALL ú ú 03.1 Page 423 ú Sep 28/02
A
757
MAINTENANCE MANUAL
S 794-137
(12)
If there is fuel in the shroud drain line, there is fuel leakage in the APU fuel line.
(a)
Find the source of the leak and repair it.
S 864-138
(13) Remove the electrical power if it is not necessary for other tasks (AMM 24-22-00/201).
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28-25-05
ú ALL ú
ú ú ú 03.101 ú Page 424Sep 28/02
A
757
MAINTENANCE MANUAL
APU FUEL CHECK VALVE - REMOVAL/INSTALLATION
___________________________________________
1. General
_______
A. The APU check valve is found in the center fuel tank. The APU check valve lets fuel go into the APU DC fuel pump but does not let fuel into the fueling manifold.
B. This procedure contains two tasks. The first task removes the APU check valve. The second task installs the APU check valve.
TASK 28-25-06-004-001
2. Remove the APU Check Valve (Fig. 401)
__________________________
A. References
(1)
AMM 06-41-00/201, Fuselage (Major Zones 100 and 200) Access Doors and Panels
(2)
AMM 28-11-00/201, Fuel Tanks
(3)
AMM 28-11-02/401, Center Tank Access Doors
(4)
AMM 28-25-05/401, APU Fuel Line and Shroud
(5)
AMM 28-26-00/201, Defueling
B.
Access
(1)
Location Zones
133 Center Wing Tank (Left)
134 Center Wing Tank (Right)
(2)
Access Panels
134AZ Center Tank Access Door (Right)
134BZ Baffle Door
134CZ Baffle Door
134DZ Baffle Door
C.
Procedure
S 654-002
(1)
Defuel the center fuel tank (AMM 28-26-00/201).
S 654-022
(2)
Drain and purge the center fuel tank (AMM 28-11-00/201).
(3)
Remove the center tank access door, 134AZ (AMM 28-11-02/401).
S 014-010
S 944-003
WARNING: OBEY THE FUEL TANK ENTRY PRECAUTIONS (AMM 28-11-00/201).
_______ FAILURE TO OBEY THE FUEL TANK ENTRY PRECAUTIONS COULD CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(4) Obey the fuel tank entry precautions (AMM 28-11-00/201).
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