(b)  
Disconnect the electrical connector from the ETC.

 (c)  
Remove the bolts and the washers that attach the ETC to the ceiling.

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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////

ETC MOUNTING BOLTS (4 LOCATIONS)

Electronic Temperature Control Installation

Figure 401

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(d)  
Remove the ETC.

 (e)  
Install the caps on the electrical connectors and the ETC receptacle for protection.

 TASK 49-61-71-404-005
 3. Electronic Temperature Control (ETC) Installation (Fig. 401)
_________________________________________________
 A. Access
 (1)  
Location Zones
 102 Flight Compartment, RH
 220 Aft Cargo Compartment Equipment Bay

 (2)  
Access Panels
 4504R Aft Cargo Compartment Door

 B. Procedure
 S 424-006
 (1)  Install the ETC:
 (a)  
Attach the ETC to the ceiling with the bolts and the washers.

 (b)  
Remove the caps from the electrical connector and the ETC receptacle.

 (c)  
Connect the electrical connector to the ETC.

 (d)  
Attach the ETC cover to the ceiling with the seven bolts and the washers.

 S 414-007
 (2)  
Close the door for the aft cargo compartment.

 S 864-008

 (3)  
Set the circuit breakers and the switches:

 (a)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P6 circuit breaker panel: 1) BATT BUS 2) APU CONT 3) APU GCU 4) HOT BATT BUS

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

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ELECTRONIC TEMPERATURE CONTROL - ADJUSTMENT/TEST
________________________________________________
 1.  General
_______
 A.  This procedure contains an adjustment task for the electronic temperature control (ETC).
 B.  You can adjust the ETC to get an EGT between 566°C (1050°C) and 649°C
 (1200°F). To adjust the ETC, you must remove the ETC cover.

 C.  The ETC is in the equipment bay in the aft cargo compartment. You can
 get access to the ETC through the door for the aft cargo compartment.

 TASK 49-61-71-805-001
 2.  Electronic Temperature Control (ETC) Adjustment (Fig. 501)
_______________________________________________
 A.  References
 (1)  AMM 49-11-00/201, APU Power Plant
 B.  Access
 (1)  
Location Zones
 101 Flight Compartment, LH
 102 Flight Compartment, RH
 220 Aft Cargo Compartment Equipment Bay

 (2)  
Access Panels
 4504R Aft Cargo Door

 C.  Procedure
 S 015-002
 (1)  
Open the door for the aft cargo compartment to get access to the compartment.

 S 015-003

 (2)  
Remove the ETC cover:

 (a)  
Remove the seven bolts and the washers that attach the ETC cover to the cargo compartment ceiling.

 (b)  
Remove the ETC cover.
　
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