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757
MAINTENANCE MANUAL
SUPPORT
BRACKET
CAP SCREW
CLAMP
APU
CHECK
APU CHECK VALVE VALVE
FLEXIBLE FULL
SEE A COUPLING APU
RETAINER SEE B C LINE FUEL
RETAINING RING O-RING NUT BODY FWD
O-RING
FERRULE RETAINING RING COUPLING FLEXIBLE FULL
FERRULE
SEE B C
APU CHECK VALVE
A
RETAINING RETAINING RING RING
FERRULE RETAINER FERRULE COUPLING
COUPLING NUT
O-RING O-RING COUPLING
COUPLING NUT
FLEXIBLE FULL COUPLING
B
FLEXIBLE FULL COUPLING
(EXPLODED VIEW)
C
APU Fuel Check Valve Installation
Figure 401
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757 MAINTENANCE MANUAL
S 014-004
(5)
Go into the fuel tank.
S 014-011
(6)
Remove the baffle doors, 134BZ, 134CZ, and 134DZ (AMM 06-41-00/201).
S 034-012
(7)
Remove the two cap screws, washers, and nuts to disconnect the clamp from around the APU check valve.
S 034-013
(8)
Disconnect the flexible full couplings on each end of the APU check valve (AMM 28-25-05/401).
S 024-005
(9)
Remove the APU check valve.
S 494-014
(10)
Install caps on the APU fuel lines to prevent entry of unwanted materials.
TASK 28-25-06-404-015
3. Install 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
B.
Access
(1)
Location Zones
133 Center Wing Section (Left)
134 Center Wing Section (Right)
(2)
Access Panels
134AZ Center Tank Access Door (Right)
134BZ Baffle Door
134CZ Baffle Door
134DZ Baffle Door
C.
Procedure
S 944-006
WARNING: OBEY THE FUEL TANK ENTRY PRECAUTIONS (AMM 28-11-00/201).
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