28-25-06
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A

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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 28-25-06
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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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