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_______ THERMOCOUPLE TRIM BOX. A LOOSE PIECE OF THE JUMPER THAT IS IN THE THERMOCOUPLE TRIM BOX CAN CAUSE DAMAGE TO THE EQUIPMENT.
 (e)  Remove the piece(s) of the jumper(s) that you cut.
 S 425-027
 (5)  
Install the gasket (4) and then the cover (3) on the back of the thermocouple trim box (1) with the two screws (2).

 (a)  
Tighten the two screws (2) to 7-9 inch-pounds (0.8-1.0 newton-meters).

 S 765-028
 (6) Do this task: Thermocouple Trim Box Resistance Check (Par. 3).
 TASK 49-61-04-705-019
 3.  Thermocouple Trim Box Resistance Check (Fig. 501)______________________________________
 A. References
 (1)  
AMM 49-61-04/401, Thermocouple Trim Box

 B.
Equipment

 (1)  
Ohmmeter (or alternative tool)

 (a)  
C15292 Ohmmeter - Electrical Bonding (also called T477W) (recommended) 01014 Avtron Mfg. Inc. 10409 Meech Ave., Cleveland, OH 44105-4166

 (b)  
Model 1010-A Micro-Ohmmeter - Autoranging/Autotest, 10 Micro-ohms to 200 Ohms, Accuracy: 0.05% (alternative) 3AD17 Barberree Custom Design 1401 Laurier House, 1600 Beach Ave., Vancouver, BC Canada VG6 1Y6, DC

 C.
Procedure

 S 025-023
 (1)  
If the thermocouple trim box is installed on the APU, do this task: Thermocouple Trim Box Removal (AMM 49-61-04/401).

 S 765-020

 (2)  
Do a resistance check of the thermocouple trim box:

 (a)  
Use the ohmmeter to measure the resistance between pin A and pin C on the thermocouple trim box receptacle J11.

 (b)  
Make sure the TRIM DEG value agrees with the resistance measurement from pin A and pin C on the thermocouple trim box receptacle J11.

 (c)  
Make sure the TRIM DEG value agrees with the EGT TRIM value on the engine reference data plate.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 425-021
 (3)  Do this task: Thermocouple Trim Box Installation (AMM 49-61-04/401).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 AIR TEMPERATURE SENSORS - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A.  This procedure gives the tasks to remove and install the air temperature sensors.
 B.  The air temperature sensor T1/T6 is near the top of the aft side of the inlet plenum. The air temperature sensor T1 and the thermocouple cold junction sensor T6 is referred to as the air temperature sensor T1/T6.
 C.  The load compressor inlet temperature sensor T12 is on the bottom forward side of the inlet plenum. The load compressor inlet temperature sensor T1.2 is referred to as the load compressor inlet temperature sensor T12.
 D.  The load compressor outlet temperature sensor T13 is on the air supply duct for the pneumatic bleed system. The load compressor delivery temperature sensor T1.3 is referred to as the load compressor outlet temperature sensor T13.
 TASK 49-61-05-004-001
 2.  Air Inlet Temperature and Thermocouple Cold Junction (T1/T6) Sensor Removal___________________________________________________________________________ (Fig. 401)
 A.  References
 (1)  
WDM 49-11-16

 (2)  
SSM 49-11-01

 (3)  
AIPC 49-61-03, Fig. 1, AIPC 49-61-05, Fig. 1

 B.  
Access

 (1)  
Location Zone 317 APU Compartment-Upper Aft Side of Air Inlet Plenum, LH 318 APU Compartment-Upper Aft Side of Air Inlet Plenum, RH

 (2)  
Access Panel
 317AL APU Access Door
 318AR APU Access Door

 C.  
Procedure

 S 864-002
 (1)  
Make sure the APU control switch is OFF and attach a DO-NOT-OPERATE tag.
　
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