TASK 49-52-71-404-006
 3.  APU Overtemperature Thermocouple Installation (Fig.401)_____________________________________________
 A. Consumable Materials
 (1)  D00010 Compound - Antiseize, MIL-A-907, Fel-Pro C-5A
 B. References
 (1)  IPC 49-60-01 Fig. 1
 C. Access
 (1)  
Location Zones
 101 Flight Compartment, LH
 205 Electronic Compartment
 703 APU Compartment

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

 D. Procedure
 S 424-007
 (1)  Install the overtemperature thermocouple:
 (a)  
Put the thermocouple through the hole in the exhaust baffle.

 (b)  
Install the grommet.

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 ú 02 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 403Jul 12/01 

////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(c)  Install the thermocouple in the mounting flange.
 1)  Use a sufficient quantity of the shim washers below the collar to give a 0.10-0.20 inch (2.5-5.1 mm) clearance between the retainer and the mounting flange.
 2)  Install the thermocouple such that the flat side with the A points to the rear of the engine (the short thermocouple probe points to the front of the engine).
 (d)  
Put the retainer and the two washers in their position on the thermocouple.

 (e)  
Apply a layer of the antiseize compound to the threads of the bolt.

 (f)  
Install the bolt with the washer.

 1)  Tighten the bolt to 50-70 pound-inches (5.7-7.9 newton-meters).

 (g)  
Attach the thermocouple cable to the tube assemblies with the clamps. 1) Make sure the thermocouple cable does not touch the

 adjacent lines, components, or the structure.

 (h)  
Connect the electrical connector to the overtemperature control switch.

 S 414-008
 CAUTION: KEEP A MINIMUM CLEARANCE OF 0.18 INCHES (5 MM) BETWEEN THE
_______ ENGINE, THE FIRE DETECTOR, THE CLAMPS, AND THE LOWER SHROUD.
 BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. SHROUD DRAIN LINES CAN OCCUR. DAMAGE TO THE
 (2)  Install the lower shroud: (a) Hold the lower shroud against the upper shr (b) Close the shroud latches. oud.
 (3)  S 414-009Close the APU cowl door: (a) Disconnect the door support rods.

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 THERMOCOUPLE  ú
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(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 864-010
 (4)  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.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
OVERTEMPERATURE CONTROL SWITCH - MAINTENANCE PRACTICES
______________________________________________________
 1.  General
_______
 A.  This procedure contains these tasks:
 (1)  
Overtemperature Control Switch Removal
　
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