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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(b)  
Open the APU cowl door.

 (c)  
Connect the door support rods.

 S 015-004
 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 035-005
 (4)  Disconnect the electrical connectors:
 (a)  
Disconnect the connector D446 from the EGT indicator on the P5 forward overhead panel.

 (b)  
Disconnect the connector D1102 from the EGT receptacle in the upper shroud.

 S 765-006
 (5)  Do the test of the insulation resistance between the EGT indicator and the EGT receptacle in the upper shroud:
 (a)  
Do a resistance check for connector D1102, pin A of the EGT receptacle in the upper shroud to ground.

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

 (c)  
Do a resistance check for connector D1102, pin B of the EGT receptacle in the upper shroud to ground.

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

 S 765-007
 (6)  Do the test of the insulation resistance of the APU engine leads:
 (a)  
Do a resistance check for connector D1102, pin A of the engine lead to ground.

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

 (c)  
Do a resistance check for connector D1102, pin B of the engine lead to ground.

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

 S 435-008
 (7)  Connect the electrical connectors:
 (a)  Connect the connector D1102 to the EGT receptacle in the upper shroud.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(b)  Connect the connector D446 for the EGT indicator on the P5 forward overhead panel.
 S 415-009
 CAUTION: KEEP A MINIMUM CLEARANCE OF 0.18 INCHES (5 MM) BETWEEN THE
_______ ENGINE, FIRE DETECTOR, CLAMPS AND LOWER SHROUD.
 BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.
 (8)  Install the lower shroud:
 (a)  
Hold the lower shroud against the upper shroud.

 (b)  
Close the shroud latches.

 S 415-010
 (9)  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 865-011
 (10) 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 49-71-00-705-012
 4. Functional Test - EGT Resistor (Fig. 501)
______________________________
 A. Standard Tools and Equipment
 (1)  
Wheatstone Bridge - measurement range of 0 to 14 ohms with an accuracy of |0.01 ohm

 (2)  
Multimeter - measurement range of 0 to 14 ohms with an accuracy of |0.01 ohm (alternative to the Wheatstone Bridge)

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