S 014-003
 (2)  Open the APU cowl door:
 (a)  Open the latches for the APU cowl door.
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 49-61-41
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
SEE A
FWDSEE B
A
MANIFOLD
FITTING
PACKING
OIL PRESSURE
SWITCH

ELECTRICAL
CONNECTOR

B
Sequencing Oil Pressure Switch Installation Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(b)  
Open the APU cowl door.

 (c)  
Connect the door support rods.

 S 014-004
 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 024-005
 (4)  Remove the oil pressure switch:
 (a)  
Disconnect the electrical connector from the oil pressure switch.

 (b)  
Remove the oil pressure switch from the manifold fitting.

 (c)  
Remove the packing from the oil pressure switch. 1) Discard the packing.

 TASK 49-61-41-404-006
 3. Oil Pressure Switch Installation (Fig. 401)
________________________________
 A. References
 (1) AMM 49-11-00/201, APU Power Plant ú (2) IPC 49-61-00 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 424-007
 (1)  Install the oil pressure switch:
 (a)  Install the new packing on the oil pressure switch.
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(b)  
Install the oil pressure switch in the manifold.

 (c)  
Connect the electrical connector to the oil pressure switch.

 S 864-009
 (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

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

 S 794-008
 (3)  APUs WITH ALLIEDSIGNAL SB GTCP85-49-7096; Examine the oil pressure switch for leakage:
 (a)  
Start and operate the APU (AMM 49-11-00/201).

 (b)  
During the APU operation, examine the oil pressure switch for leakage.

 (c)  
Do the APU usual shutdown (AMM 49-11-00/201).

 (d)  
Attach a DO-NOT-OPERATE tag to the APU master switch on the P5 forward overhead panel.

 (e)  
If you found leakage, repair the cause of it.

 S 794-013
 (4)  APUs WITHOUT ALLIEDSIGNAL SB GTCP85-49-7096; Examine the oil pressure switch for leakage:
 (a)  
Start and operate the APU (AMM 49-11-00/201).

 (b)  
Do the APU usual shutdown (AMM 49-11-00/201).

 (c)  
Attach a DO-NOT-OPERATE tag to the APU master switch on the P5 forward overhead panel.

 (d)  
　
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