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 49-71-00
 ALL  ú ú 04 Page 501 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(2)  Access Panels
 1201 Electronic Equipment Access Door
 4504 Aft Cargo Door

 C. Procedure
 S 865-026
 (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 015-027
 (2)  
Open the door for the aft cargo compartment to get access to the
 electronic temperature control (ETC).

 S 035-028

 (3)  
Disconnect the electrical connectors:

 (a)  
Disconnect the connector D446 from the EGT indicator on the P5 forward overhead panel.

 (b)  
Disconnect the connector D10114 from the ETC in the aft cargo compartment.

 S 765-029
 (4)  Do the test of the insulation resistance between the EGT indicator
 and the ETC:

 (a)  
Do a resistance check for connector D10114, pin 9 of the ETC to ground.

 (b)  
The resistance must be more than 100,000 ohms.

 (c)  
Do a resistance check for connector D10114, pin 8 of the ETC to ground.

 (d)  
The resistance must be more than 100,000 ohms.

 S 765-030
 (5)  Do the test of the insulation resistance of the APU engine leads:
 (a)  
Do a resistance check for connector D10114, pin 1 of the ETC to ground.

 (b)  
The resistance must be more than 10,000 ohms.

 (c)  
Do a resistance check for connector D10114, pin 3 of the ETC to ground.

 (d)  
The resistance must be more than 10,000 ohms.

 S 435-031
 (6)  Connect the electrical connectors:
 (a)  
Connect the connector D10114 to the ETC in the aft cargo compartment.

 (b)  
Connect the connector D446 to the EGT indicator on the P5 forward overhead panel.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 415-032
 (7)  
Close the door for the aft cargo compartment.

 S 865-033

 (8)  
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.

 TASK 49-71-00-705-034
 3.  AIRPLANES WITHOUT THE ETC; Insulation Resistance Test
__________________________
 A.  Standard Tools and Equipment
 (1)  Ohmmeter - approved to 100,000 ohms
 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 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.
　
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