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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH THE ETC ú

 49-71-31
 ú ú 01 Page 403 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
ETC THERMOCOUPLE PROBE - ADJUSTMENT/TEST
________________________________________
 1.  General
_______
 A.  This task gives a task to do an operational test of the ETC thermocouple probe.
 B.  The ETC thermocouple probe is installed on the rear of the APU engine. You can get access to the thermocouple probe through the APU cowl door.
 TASK 49-71-31-705-001
 2.  ETC Thermocouple Probe Test
___________________________
 A.  Equipment and Materials
 (1)
Gas Turbine Engine Tester - No. 290270-2-1, AlliedSignal, Inc., ú Airline Services Division, ú P.O. Box 52170, Phoenix, AZ 85072-2170 ú (or equivalent tester) ú (2) Electrical Cable Assembly - 834367-1, AlliedSignal, Inc. ú (or equivalent cable assembly)

 (3)
Test Cable Assembly - 294110-1, AlliedSignal, Inc. (this is used ú with adapter cable assembly 2024498-1 as an ú alternative to the electrical cable assembly ú 834367-1)

 (4)
Adapter Cable Assembly - 2024498-1, AlliedSignal, Inc. (this is ú used with test cable assembly 294110-1 as ú an alternative to the electrical cable ú assembly 834367-1)

 B.  References
 (1)  
AMM 49-11-00/201, APU Power Plant

 (2)  
AMM 49-61-71/501, Electronic Temperature Control

 (3)  
AMM 49-71-00/501, Exhaust Gas Temperature Indicating System

 C.  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

 D.  Procedure
 S 865-002
 (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-OPERATE tag.

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

 S 015-003
 (2)  Open the APU cowl door:
 (a)  Open the latches for the APU cowl door.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH THE ETC ú

 49-71-31
 ú ú 01.1 Page 501 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(b)  
Open the APU cowl door.

 (c)  
Connect the door support rods.

 S 015-004
 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.

 (b)  
Remove the lower shroud.

 S 715-005
 (4)  Do the test of the ETC thermocouple probe:
 (a)  Remove the locknuts from the studs on the side of the ETC thermocouple probe in the tailpipe.
 NOTE: During this test, the ETC thermocouple leads must be
____ connected to the ETC thermocouple probe at all times.
 (b)  Connect the leads of the electrical cable or adapter cable assembly to the studs on the side of the ETC thermocouple probe with the locknuts.
 NOTE: If the adapter cable assembly is used, the test cable
____ assembly must be connected to the adapter cable assembly.
 (c)  
Connect the electrical cable or test cable assembly to the tester receptacle.

 (d)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker: 1) E3-3 Electrical Shelf, APU Control Unit
　
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