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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(c)  
Install the new filter element on the filter guide.

 (d)  
Apply a thin layer of lubricant on the new packing for the filter cap.

 (e)  
Install the new packing on the filter cap.

 (f)  
Install the filter cap for the high pressure fuel filter on the fuel control unit.

 (g)  
Tighten the filter cap to 100-120 pound-inches
 (11.3-13.6 N.m).

 (h)  
Install a lockwire between the filter cap and the fuel control unit.

 S 863-014
 (7)  Set the circuit breaker and the switch:
 (a)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker: 1) E3-3 Electrical Shelf, APU Control Unit

 (b)  
Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.

 S 793-012
 (8)  APUs WITH ALLIEDSIGNAL SB GTCP85-49-7096; Examine the high pressure fuel filter for leakage:
 (a)  
Start and operate the APU (AMM 49-11-00/201).

 (b)  
During the APU operation, examine the high pressure fuel filter for leakage.

 (c)  
Do the APU usual shutdown (AMM 49-11-00/201).

 (d)  
Attach a DO-NOT-OPERATE tag to the APU master switch on the P5 forward overhead panel.

 (e)  
If you found leakage, repair the cause of it.

 S 793-016
 (9)  APUs WITHOUT ALLIEDSIGNAL SB GTCP85-49-7096; Examine the high pressure fuel filter for leakage:
 (a)  
Start and operate the APU (AMM 49-11-00/201).

 (b)  
Do the APU usual shutdown (AMM 49-11-00/201).

 (c)  
Attach a DO-NOT-OPERATE tag to the APU master switch on the P5 forward overhead panel.

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(d)  Visually examine the high pressure fuel filter for any signs of leakage: 1) If you found signs of leakage, repair the cause of it.
 S 413-008
 CAUTION: KEEP A MINIMUM CLEARANCE OF 0.18 INCHES (5 MM) BETWEEN THE
_______ ENGINE, FIRE DETECTOR, CLAMPS AND LOWER SHROUD.
 BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.
 (10) Install the lower shroud:
 (a)  
Hold the lower shroud against the upper shroud.

 (b)  
Close the shroud latches.

 S 413-009
 (11) Close the APU cowl door:
 (a)  
Disconnect the door support rods.

 (b)  
Put the door support rods in the clips on the APU cowl door.

 (c)  
Close the APU cowl door.

 (d)  
Close the latches for the APU cowl door.

 S 863-015
 (12) Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
FUEL HEATER CHECK VALVE - REMOVAL/INSTALLATION
______________________________________________
 1.  General
_______
 A.  The fuel heater check valve (which is referred to as the check valve) isolates possible air leakage in the fuel supply system for the APU. The check valve also supplies fuel to prepare the APU fuel pump during an APU start.
 TASK 49-31-91-004-001
 2.  Check Valve Removal (Fig. 401)
___________________
 A.  Standard Tools and Equipment
 (1)  Container - for fuel, 1 U.S. gallon (4 liter) capacity
 B.  References
 (1)  AMM 49-11-00/401, APU Power Plant
 C.  Access
 (1)  
Location Zones
　
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