S 412-108
 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.
 (16) Install the lower shroud:
 (a)  
Hold the lower shroud against the upper shroud.

 (b)  
Close the shroud latches.

 S 412-109
 (17) 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 862-132
 (18) Close this circuit breaker and remove the DO-NOT-CLOSE tag:
 (a)  E3-3 Electrical Shelf, APU Control Unit
 S 862-116
 (19) Make sure the APU Master Switch is set to OFF.
 F. Leak Check of the APU Bypass Check Valve and Pressure Relief Valve
 NOTE: After you find that there is a leak in one of the APU fuel
____ check valves, this procedure helps to isolate the leak to a specific check valve.
 S 862-128
 (1)  Set the APU master switch, on the P5 forward overhead panel, to the ON position.
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A 737-300/400/500MAINTENANCE MANUAL
 (2)  S 862-131Open this circuit breaker and attach a DO-NOT-CLOSE tag: (a) E3-3 Electrical Shelf, APU Control Unit
 (3)  S 862-123Supply external electrical power (AMM 24-22-00/201).
 (4)  S 862-124Set the left center override pump to ON.
 (5)  S 712-125Monitor the fuel quantities in the center tank and the No. 1 tank for fuel transfer from the center tank to the No. 1 tank for a minimum of two hours. (a) If the pressure relief valve has leakage it can cause a fuel transfer of approximately 20 pounds per hour (approximately 10 kilograms per hour). (b) If the bypass check valve has leakage, it can cause a transfer of approximately 2500 pounds per hour (approximately 1140 kilograms per hour). (c) If there is no fuel transfer, and leakage was found in the APU fuel system between the fuel tank and the APU shutoff valve, then there is a problem with the main APU fuel check valve.
 (6)  S 862-130Close this circuit breaker and remove the DO-NOT-CLOSE tag: (a) E3-3 Electrical Shelf, APU Control Unit
 (7)  S 862-117Set the APU master switch, on the P5 forward overhead panel, back to the OFF position.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ENGINE FUEL FEED SYSTEM - ADJUSTMENT/TEST
_________________________________________
 1.  General_______
 A. This procedure has these tasks:
 (1)  
The test for the fuel shutoff valve for each of the engines.

 (2)  
The test for fuel crossfeed valve for the engines.

 (3)  
The test for fuel boost pump control and indication.

 (4)  
The test for the fuel boost pump output pressure.

 (5)  
The test for the fuel boost pump removal valve, vent valve, check valve, and pressure fueling line outlet check valve.

 (6)  
The test for the bypass valve for the fuel boost pump.

 (7)  
The test for leaks in the valves of the fuel feed system.

 (8)  
The test for the boost pump override system for the center tank.

 TASK 28-22-00-715-001
 2.  Engine Fuel Shutoff Valve Test______________________________
 A. General
 (1)  You must do this task for each of the two engine shutoff valves. Each of the engines has one engine shutoff valve.
 B. References
 (1)  
AMM 24-22-00/201, Manual Control
　
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