(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

Oil Pressure Indicating System Test Schematic
Figure 503

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
D. Preconditions
 S 865-029-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).

 E.
Prepare to Do a Test of the Indicating System for the Oil Pressure

 S 865-004-N00
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-005-N00

 (2)  
Make sure these circuit breakers that follow are closed:

 (a)  
P6 Main Power Distribution Panel
 1) 6D1 OIL PRESS ENG 1
 2) 6D2 OIL PRESS ENG 2
 3) 6D3 OIL PRESS ENG 3
 4) 6D4 OIL PRESS ENG 4

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

 S 015-018-N00
 (3)  Open the left fan cowl panel (AMM 71-11-04/201).
 S 045-023-N00
 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______
 OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF
 THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO
 EQUIPMENT.

 (4)  
Do this procedure: Thrust Reverser Deactivation for Ground
 Maintenance (AMM 78-31-00/201).

 (5)  
Open the left core cowl panel (AMM 71-11-06/201).

 S 015-019-N00
 S 015-024-N00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 WHEN YOU OPEN THE
_______
 THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS,
 INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

 (6)  Open the left thrust reverser (AMM 78-31-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F. Do a Test of the Indicating System for the Oil Pressure
 S 035-007-N00
 (1)  
Disconnect the oil pressure tube from the oil pressure transmitter.

 S 485-008-N00

 (2)  
Connect the line from the air pressure source to the oil pressure transmitter.

 S 735-009-N00

 (3)  
Apply a pressure of 100 |1.0 psi (667 |7 kPa) to the oil pressure transmitter.

 S 735-010-N00

 (4)  
Make sure the oil pressure indication on the auxiliary EICAS display shows 100 |9 psi.

 S 735-011-N00

 (5)  
Decrease the pressure to 60 |1.0 psi (400 |7 kPa).

 S 735-012-N00

 (6)  
Make sure the oil pressure indication on the auxiliary EICAS display shows 60 |9 psi.

 S 735-013-N00

 (7)
Decrease the pressure at the oil pressure transmitter to zero.

 S 085-014-N00

 (8)  
Disconnect the line for the air pressure source from the oil pressure transmitter.

 S 435-015-N00

 (9)
Connect the oil pressure tube to the oil pressure transmitter.

 (a)  Tighten the tube nut.

 G.
Put the Airplane Back to Its Usual Condition.

 S 415-025-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).

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

 (3)  
　
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