TASK 49-71-31-004-001
 2.  ETC Thermocouple Probe Removal (Fig. 401)______________________________
 A.  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

 B.  Procedure
 S 864-002
 (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 014-003
 (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 014-005
 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 024-006
 (4)  Remove the thermocouple probe:
 (a)  
Disconnect the leads from the terminals of the thermocouple probe.

 (b)  
Remove the bolts that attach the thermocouple probe.

 (c)  
Remove the ETC thermocouple from the exhaust flange.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH THE ETC ú

 49-71-31
 ú ú 03 Page 401 ú Nov 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
ETC THERMOCOUPLE
ATTACH BOLTS
(2 LOCATIONS)

THERMOCOUPLE
TERMINALS

(4)
WIRE
HARNESS

A
ETC Thermocouple Installation Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH THE ETC ú

 49-71-31
 ú ú 01 Page 402 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
TASK 49-71-31-404-007
 3. ETC Thermocouple Probe Installation (Fig. 401)
___________________________________
 A. Consumable Materials
 (1) A00849 Compound - Antiseize, Fel-Pro C-5A (AMM 20-30-21/201)
 B. 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

 C. Procedure
 S 424-008
 (1)  Install the thermocouple probe:
 (a)  
Apply the high temperature compound (Fel-Pro C5-A) to the threads of the bolts.

 (b)  
Put the ETC thermocouple in the exhaust flange.

 (c)  
Attach the ETC thermocouple with the bolts. 1) Tighten the bolts to 50-70 pound-inches.

 (d)  
Connect the leads to the studs of the ETC thermocouple.

 S 414-009
 CAUTION: KEEP A MINIMUM CLEARANCE OF 0.18 INCH (5 MM) BETWEEN THE
_______ ENGINE, FIRE DETECTOR, CLAMPS, AND LOWER SHROUD.
 BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD CAN OCCUR.
 (2)  Install the lower shroud:
 (a)  
Hold the lower shroud against the upper shroud.

 (b)  
Close the shroud latches.

 S 414-010
 (3)  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 864-011
 (4)  Set the circuit breaker and the switch:
　
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