(2)
71-11-04/201, Fan Cowl Panels
(3)
71-11-06/201, Core Cowl Panels
(4)
78-31-00/201, Thrust Reverser System
B.
Access
(1)
Location Zone
412 Engine 1 - HPC Case 10:00 o'clock
422 Engine 2 - HPC Case 10:00 o'clock
432 Engine 3 - HPC Case 10:00 o'clock
442 Engine 4 - 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 Deactivate the PRV
(1)
Release the pressure in the pneumatic system (Ref 36-00-00/201).
S 862-002
S 042-003
WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
_______ PREVENT THE OPERATION OF THE THRUST REVERSER. ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(2) Do the deactivation procedure for the thrust reverser for ground maintenance (Ref 78-31-00/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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A
747-400
MAINTENANCE MANUAL
SWITCH
ACTUATING
LEVER MANUAL
SEE A OVERRIDE
DRIVE
B TERMINAL
BLOCK
PRESSURE
REGULATING ACTUATOR
VALVE CAP POSITIONING
SCREW
HIGH PRESSURE SHUTOFF VALVE (REF) SEE B
FWD
A
Pressure Regulating Valve Deactivation Figure 201
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A
747-400
MAINTENANCE MANUAL
S 012-015
(3)
Open the left fan cowl panel (Ref 71-11-04/201).
S 012-016
(4)
Open the left core cowl panel (Ref 71-11-06/201).
S 012-017
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU OPEN THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(5)
Open the left thrust reverser (Ref 78-31-00/201).
D.
Deactivate the PRV
S 042-004
(1) Remove the positioning screw from the actuator cap.
NOTE: Do not disconnect the retaining cable from the positioning
____
screw.
S 042-005
(2) Install the positioning screw in the switch actuating lever to lock the PRV in the CLOSED position.
S 412-018
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU CLOSE THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(3)
Close the left half of the thrust reverser (Ref 78-31-00/201).
S 412-021
(4)
Close the left core cowl panel (Ref 71-11-06/201).
(5)
Close the left fan cowl panel (Ref 71-11-04/201).
S 442-019
(6)
Do the activation procedure for the thrust reverser (Ref
78-31-00/201).
S 412-020
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A
747-400 MAINTENANCE MANUAL
TASK 36-11-19-442-007
3. Activate the PRV (Fig. 201)________________
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