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(4)  After the engine stops and the oil system is no longer pressurized, the switch is in the closed position. If the switch fails to close, the OIL PRESS SNS (1, 2, 3, or 4) EICAS advisory message shows. This message shows that the Low Oil Pressure system has a malfunction and shows a high oil pressure when the system pressure is low.
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LOW OIL PRESSURE WARNING SYSTEM - ADJUSTMENT/TEST
_________________________________________________
 1.  General
_______
 A.  This procedure gives the instrucitons to do an operational or system test of the warning system for the low oil pressure.
 B.  You must do the operational test during the engine start and is used to make sure the indicating system operates. You can also use the operational test to make sure the system operation after the replacement of the warning switch for the low oil pressure.
 C.  The system test is used to do a test of the system performance. You can use the system test with the system fault isolation.
 TASK 79-33-00-715-030-N00
 2.  Operational Test - Low Oil Pressure Warning System (Fig. 501)
__________________________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 31-61-00/501, Integrated Display System

 (3)  
AMM 45-10-00/501, Central Maintenance Computer

 (4)  
AMM 71-00-00/201, Power Plant

 (5)  
WDM 79-33-11

 (6)  
SSM 79-33-01

 B.  
Access

 (1)  
Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

 C.  
Preconditions

 S 865-036-N00
 (1)  
These conditions are necessary for this task:

 (a)  
Electric power on (AMM 24-22-00/201).

 (b)  
Engine Indicating and Crew Alert System (EICAS), serviceable (AMM 31-61-00/201).

 (c)  
Central Maintenance Computer System (CMCS), serviceable (AMM 45-10-00/201).

 D.  
Do a Test of the Indicating System for the Low Oil Pressure

 S 415-031-N00
 (1)  
Make sure these circuit breakers that follow are closed:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7F9 EIU L
 2) 7F10 EIU C
 3) 7F15 EIU R

 (2)
Get access to the CMCS input monitoring (AMM 45-10-00/201).

 S 845-034-N00
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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 
OIL PRESSURE  A 
TRANSMITTER 
(REF) 
VENT TUBE 
ENGINES WITHOUT SB 79-2036 
LOW OIL PRESSURE  A 
WARNING SWITCH, 
S1584 
TUBE 
NUT 
OIL PRESSURE 
FWD  TUBE 
A-A 
Low Oil Pressure Warning Switch Location 
Figure 501 (Sheet 1) 

E18778
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B 
OIL PRESSURE 
　
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