S 085-015-N00
 (6)  Disconnect the line for the air pressure source from the warning switch connection.
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S 435-016-N00
 (7)  
Connect the oil pressure tube to the warning switch.

 (a)  
Tighten the tube nut for the oil pressure tube.

 G.
Put the Airplane Back to Its Usual Condition.

 S 415-029-N00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 WHEN YOU CLOSE THE
_______ THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (1)  
Close the left thrust reverser (AMM 78-31-00/201).

 S 415-024-N00

 (2)  
Close the left core cowl panel (AMM 71-11-06/201).

 S 415-025-N00

 (3)  
Close the left fan cowl panel (AMM 71-11-04/201).

 S 445-026-N00

 (4)  
Do the activation procedure for the thrust reverser
 (AMM 78-31-00/201).

 S 865-018-N00

 (5)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

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LOW OIL PRESSURE WARNING SWITCH - REMOVAL/INSTALLATION
______________________________________________________
 1.  General
_______
 A.  This procedure gives the instructions to remove and install the warning switch (S1584) for the low oil pressure.
 B.  The warning switch is installed on the forward case of the high pressure compressor (HPC) at the 10:00 o'clock position.
 C.  You can get access to the warning switch through the left thrust reverser.
 TASK 79-33-01-004-001-N00
 2.  Remove the Low Oil Pressure Warning Switch (Fig. 401)
__________________________________________
 A.  References
 (1)  
AMM 71-11-04/201, Fan Cowl Panels

 (2)  
AMM 71-11-06/201, Core Cowl Panels

 (3)  
AMM 78-31-00/201, Thrust Reverser System

 (4)  
IPC 79-32-01 Fig. 1

 (5)  
WDM 79-33-11

 (6)  
SSM 79-33-01

 B.  
Access

 (1)  
Location Zone
 412 Engine 1 - Fwd HPC Case 10:00 o'clock
 422 Engine 2 - Fwd HPC Case 10:00 o'clock
 432 Engine 3 - Fwd HPC Case 10:00 o'clock
 442 Engine 4 - Fwd HPC Case 10:00 o'clock

 (2)  
Access Panel
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4

 C.  
Prepare to Remove the Warning Switch

 S 024-028-N00
 (1)  Open these circuit breakers as follows and install the DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7F9 EIU L
 2) 7F10 EIU C
 3) 7F15 EIU R

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
A

INTERMEDIATE
CASE (REF)

SEE A
FWD

LOW OIL PRESSURE
WARNING SWITCH, S1584
A
OIL PRESSURE TRANSMITTER (REF) ELECTRICAL CONNECTOR, DS1584
VENT TUBE
ENGINES WITHOUT SB 79-2036 A
　
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