(4)  
The signals are sent to the EIU, and then to the auxiliary EICAS display which supplies the data on a vertical scale with triangular analog pointers and digital readouts. The digital readouts change from white to red when the engine oil pressure decreases to 77 psi or less.

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
OIL PRESSURE TRANSMITTER
SEE  A 
OIL PRESSURE TRANSMITTER 
INTERMEDIATE CASE (REF) 
FWD A ENGINES WITHOUT SB 79-2036 

FWD
ENGINES WITH SB 79-2036 A
Oil Pressure Transmitter Location Figure 1
E18721
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SEE B
SEE A
CABIN ALTITUDE TAT +21c TO +23c
AUTOTHROT DISC
7878 21 81
1.83 1.83 REV 1.83
OUTFLOW VLV L
N2 1.62 1.62 1.00 1.65
EPRX-BLD
FF CON IGNITION SEATBELTS
17.6 17.6 0.0 18.3
N
RECALL STATUS PG 1
75.6 75.6 15.2 83.7
1
FL 250 246-324 KTS
NAI WAI
WAI
587 587 EGT 97 623OIL P 535
65 6665 12
N
78 78 2 21 XB 81 UPGEARUP
17.6 17.6 FF 0.0 15 18.3
DN DN 65 65 OIL P 12 66 105 105 OIL T 103 107
F
105 OIL T
105 103
L
107
15 15 OIL Q 19 15
ANN 5P
21.2 2 1.2 VIBN20.5 N21.2
S
15 15 OIL Q 19 15
N2

N2 N2 N2
12 DUCT PRESS 12
1.2
1.2 VIB 0.5
1.2  CAB ALT 7500 RATE +250 LBS X
TOTAL FUEL 345.0
LDG ALT 200AUTO ~P 5.6
1000TEMP +10c
AUXILIARY EICAS DISPLAY  COMPACTED EICAS DISPLAY
A AOR B
Oil Pressure Indication
Figure 2

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Figure 3

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OIL PRESSURE INDICATING SYSTEM - ADJUSTMENT/TEST
________________________________________________
 1.  General
_______
 A.  This procedure gives the instructions to do an operational or system test of the indicating system for the oil pressure.
 B.  You can do the operational test when the engines are in operation and is
 done to make sure the indicating system operates correctly. You can use
 the operational test to make sure the system operation is correct after
 the replacement of the oil pressure transmitter.

 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 79-32-00-715-001-N00
 2.  Operational Test - Oil Pressure Indicating System (Fig. 501)
_________________________________________________
 A.  References
 (1)
AMM 71-00-00/201, Power Plant

 (2)
WDM 79-32-11, 79-32-12

 (3)
SSM 79-00-01

Oil Pressure Indication
Figure 501

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