H29456
Oil Pressure Indicating System 500
79-32-0 Figure 1 May 15/67
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
4. Operation
A. Engine oil manifold pressure and vent pressure are applied to opposite sides of the diaphragm in the oil pressure transmitter. The pressure differential positions the diaphragm, and in turn, the rotor position of a synchro transmitter. The rotor of the oil pressure indicator's synchro receiver assumes a position corresponding to the transmitter rotor, since the stators of both are connected in parallel. The synchro receiver rotor drives the oil pressure indicator pointer, through a gear train, to indicate oil pressure.
B. If power is interrupted, the indicator will remain at the pressure recorded at the moment of interruption. Electrical power for the system is 28 volts, 400-cycle ac through circuit breaker panel P6.
533
May 1/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 79-32-0 Page 3
540
Jun 20/86 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 79-32-0 Page 101
H27806
Oil Pressure Indicating System Trouble Shooting 533
79-32-0 Figure 101 Jun 20/86
Page 102
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
OIL PRESSURE INDICATING SYSTEM - ADJUSTMENT/TEST
1. Oil Pressure Indicating System Test
A. General
(1)
The oil pressure indicating system test is performed to ensure operational integrity of the oil pressure transmitter, electrical wiring, and the oil pressure indicator.
(2)
The system test is accomplished by connecting a variable air pressure source to the pressure side of the oil pressure transmitter and checking that the applied pressure is correctly indicated on the oil pressure indicator.
B. Equipment and Materials
(1) Variable Dry Air Pressure Source - 0 to 100 psi
C. Prepare to Test Oil Pressure Indicating System
(1)
Open applicable left side cowl panel.
(2)
Connect electrical power to airplane.
(3)
Close applicable Oil Temperature and Pressure circuit breaker on panel P6.
D. Test Oil Pressure Indicating System
(1)
Disconnect oil pressure transmitter pressure line at low oil pressure switch (lower end.) (See figure 501.)
(2)
Connect air pressure source to disconnected line.
(3)
Cap or cover switch opening to prevent entry of foreign matter into system.
(4)
Apply 80 psig air pressure. Check that oil pressure indicator on engine instrument panel reads 80 (士 3) psig.
(5)
Hold pressure for 3 minutes. Check that there is no leakage.
(6)
Open applicable Oil Temperature and Pressure circuit breaker on panel P6. Check that oil pressure indicator reading does not change. Close circuit breaker.
(7)
Reduce air pressure to 45 psig. Check that oil pressure indicator reads 45 (士 3) psig.
(8)
Reduce pressure to zero psig and observe indicator reading. Check that indicator pointer returns to zero (+3) psig.
(9)
Disconnect air pressure source from oil pressure transmitter pressure line. Remove cap or cover from switch opening and connect pressure line to fitting in oil port of low oil pressure switch (Fig. 501).
(10)
Close left side cowl panel.
(11)
If no longer required, remove electrical power.
501
May 15/69 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 79-32-0 Page 501
NOTE: The first time that engine is operated after performing this test, check to ensure that no leakage occurs at transmitter pressure line connection on low oil pressure switch.
H31466
Oil Pressure Indicating System Test 533
79-32-0 Figure 501 Jun 20/84
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
OIL PRESSURE TRANSMITTER - REMOVAL/INSTALLATION
1. Remove Oil Pressure Transmitter
A. Open applicable left side cowl panel.
B. Open applicable oil temperature and pressure circuit breaker on panel P6.
C. Disconnect oil pressure transmitter electrical connector (Fig. 401).
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