(b)  
Remove the lower shroud.

 S 024-004
 (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 49-61-51-404-006
 3.  Low Oil Pressure Switch Installation (Fig. 401)____________________________________
 A. References
 (1)  
AMM 49-11-00/201, APU Power Plant

 (2)  
IPC 49-70-01 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 424-007
 (1)  Install the oil pressure switch:
 (a) Install a new packing on the oil pressure switch.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(b)  
Install the oil pressure switch in the manifold fitting.

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

 S 864-008
 (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 794-009
 (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)  
Visually examine the oil pressure switch for any signs of leakage: 1) If you found signs of leakage, repair the cause of it.

 S 414-010
 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. SHROUD DRAIN LINES CAN OCCUR. DAMAGE TO THE
 (5)  Install the lower shroud: (a) Hold the lower shroud against the upper shroud. (b) Close the shroud latches.
 (6)  S 414-011Close 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.

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(d)  Close the latches for the APU cowl door.
 S 864-012
 (7)  Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.
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