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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(b)  Remove the lower shroud.
 S 024-005
 (4)  Remove the PCV:
 (a)  
Disconnect the electrical connector from the PCV.

 (b)  
Disconnect the control air line from the PCV.

 (c)  
Remove the two bolts and the washers that attach the PCV to the bracket.

 (d)  
Remove the PCV from the bracket.

 TASK 49-52-31-404-006
 3. Proportional Control Valve (PCV) Installation (Fig. 401)
_____________________________________________
 A. References
 (1)  AMM 49-11-00/501, APU Power Plant
 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 424-007
 (1)  Install the PCV:
 (a)  
Put the PCV in its position on the bracket.

 (b)  
Install the two bolts and the washers that attach the PCV to the bracket.

 (c)  
Connect the control air line to the PCV.

 (d)  
Connect the electrical connector to the PCV.

 S 864-010
 (2)  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
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ETC ú

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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(b)  Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.
 S 714-011
 (3)  Do the APU operation test (AMM 49-11-00/501).
 S 414-008 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.
 (4)  Install the lower shroud: (a) Hold the lower shroud against the upper shroud. (b) Close the shroud latches.
 S 414-009
 (5)  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.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ETC ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
APU CONTROL THERMOSTAT - REMOVAL/INSTALLATION
_____________________________________________
 1.  General
_______
 A.  This procedure contains the removal and the installation tasks for the APU control thermostat.
 B.  The APU control thermostat is on the aft end of the APU. You can get access to the thermostat through the APU cowl door.
 TASK 49-52-32-004-001
 2.  APU Control Thermostat Removal (Fig. 401)
______________________________
 A.  References
 (1)  IPC 49-50-01 Fig. 1
 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 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
　
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