49-52-81
 CONTROL SWITCH  ú ú 02 Page 203 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
CAUTION:_______MAKE SURE YOU DO THE CIRCUIT CHECK THAT FOLLOWS. A WIRE HARNESS PROBLEM CAN CAUSE DAMAGE TO THE NEW CONTROL SWITCH.
 (a)  Do a continuity check between terminals A and B, on the electrical connector D1572, and ground.
 NOTE: Continuity between a pin and ground shows there is a
____ problem in the wire harness or the connector.
 1)  If there is continuity between one of the two terminals and ground, repair the connector or the wire harness.
 (b)  
Attach the control switch to the cooling air duct with the screws and the washers.

 (c)  
Connect the electrical connectors to the J1 receptacle and the J2 receptacle. 1) Install lockwire on the connectors.

 S 412-008
 CAUTION: KEEP A MINIMUM CLEARANCE OF 0.18 INCHES (5 MM) BETWEEN THE
_______ ENGINE, THE FIRE DETECTOR, THE CLAMPS, AND THE LOWER SHROUD.
 BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD.  DAMAGE TO THE
 SHROUD DRAIN LINES CAN OCCUR.
 (2)  Install the lower shroud: (a) Hold the lower shroud against the upper shroud. (b) Close the shroud latches.
 S 412-009
 (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 862-010
 (4)  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.

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 49-52-81
 CONTROL SWITCH  ú ú 02 Page 204 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
TASK 49-52-81-702-011
 4.  Overtemperature Control Switch Operational Test (Fig. 201)_______________________________________________
 A. References
 (1)  AMM 49-11-00/201, APU Power Plant
 B. Access
 (1)  
Location Zones
 101 Flight Compartment, LH
 205 Electronic Compartment
 703 APU Compartment

 (2)  
Access Panels
 1201 Electronic Equipment Access Door
 3804 APU Cowl Door

 C. Procedure
 S 842-012
 (1)  Prepare for the test:
 (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 the APU cowl door: 1) Open the latches for the APU cowl door. 2) Open the APU cowl door. 3) Connect the door support rods.

 CAUTION:_______BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.

 (c)  
Remove the lower shroud: 1) Hold the lower shroud and open the shroud latches. 2) Remove the lower shroud.

 (d)  
Disconnect the electrical connector from the J1 receptacle on the control switch.

 S 712-013
 (2)  Do the control switch test:
 (a)  
Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.

 (b)  
Start and operate the APU (AMM 49-11-00/201).

 (c)  
Monitor the duct pressure indicator. 1) Set the engines 1 and 2 BLEED switches, on the P5 forward

 overhead panel, to OFF. 2) Set the ISOLATION VALVE switch to AUTO. 3) Set the switch for the APU BLEED valve to ON.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH THE OVERTEMPERATURE ú

 49-52-81
 CONTROL SWITCH  ú ú 02 Page 205 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
　
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