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 A. General
 (1)  It is not necessary to do the governor speed test for the fuel control unit after you replace the APU, fuel control unit or bleed air valve. You can use this test for troubleshooting and governor speed adjustment of the fuel control unit.
 B. Special Tools and Equipment
 (1)  
290270-2-1 Tester - Gas Turbine Engine, AlliedSignal, Inc., Airline Services Division, P.O. Box 52170, Phoenix, AZ 85072-2170

 (2)  
Equivalent Tester - (this is an alternative to the 290270-2-1 engine tester).

 (3)  
834367-1 Assembly - Electrical Cable, AlliedSignal, Inc.

 (4)  
294110-1 Assembly - Test Cable, AlliedSignal, Inc. (this is an alternative to the 834367-1 Electrical Cable Assembly)

 (5)  
2024498-1 Assembly - Adapter Cable, AlliedSignal, Inc. (this is an alternative to the 834367-1 Electrical Cable Assembly)

 (6)  
833274-1 Wrench - Adjuster, AlliedSignal, Inc.

 (7)  
833275-1 Wrench - Jamnut, AlliedSignal, Inc.

 (8)  
280353 Assembly - Screwdriver and Wrench, AlliedSignal, Inc.

 C. Standard Tools and Equipment
 (1)  
AIRPLANES WITHOUT THE ETC; Wheatstone Bridge - measurement range of 8 ohms (|0.05%), Model 1432U, General Radio Co., W. Concord, MA

 (2)  
AIRPLANES WITH THE ETC; Wheatstone Bridge - measurement range of 8 ohms (|0.05%), No. 4289-2, Leeds and Northrup Co., Sumneytown Pike, North Wales, PA 19454

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(3)  Multimeter - measurement range of 8 ohms (|0.05%), Model 8012A-01, Fluke, P.O. Box 9090, Everett, WA 98206-9090 (this is an alternative to the wheatstone bridge)
 D. References
 (1)  AMM 49-11-00/201, APU Power Plant
 E. Access
 (1)  
Location Zones
 101 Control Cabin, LH
 205 Electronic Compartment
 703 APU Compartment

 (2)  
Access Panels
 1201 Electronic Equipment Access Door
 3804 APU Cowl Door

 

 F. Procedure
 S 865-037
 (1)  Set the switch and the circuit breaker:
 (a)  
Set the APU master switch on the P5 forward overhead panel to the OFF position and attach a DO-NOT-CLOSE tag.

 (b)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag: 1) E3-3 Electrical Shelf, APU Control Unit

 S 015-038
 (2)  Open the APU cowl door:
 (a)  
Open the latches for the APU cowl door.

 (b)  
Open the APU cowl door.

 (c)  
Connect the door support rods.

 S 015-039
 CAUTION:_______BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.
 (3)  Remove the lower shroud:
 (a)  Hold the lower shroud and open the shroud latches.
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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 ////////////////////////
(b)  Remove the lower shroud.
 S 485-044
 (4)  Install the turbine engine tester on the engine (Fig. 503):
 (a)  
Disconnect the electrical connector D1252 on the APU harness (47) from the receptacle D452 in the upper shroud.

 (b)  
Connect the electrical cable or test cable assembly (46) to the electrical connector D1252 and the receptacle D452.

 NOTE: The connectors on the electrical cable or test cable
____ assembly are identified by aluminum markers.
 (c)  
AIRPLANES WITHOUT THE ETC; Disconnect the leads of the thermocouple harness from the terminals of the EGT thermocouple probe.

 (d)  
AIRPLANES WITH THE ETC; Disconnect the leads of the thermocouple harness from the studs of the ETC thermocouple probe.

 (e)  
　
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