(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

 36-11-19
 ALL  ú ú 01P Page 201 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 36-11-19
 ALL  ú ú 01P Page 202 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 36-11-19
 ALL  ú ú 01P Page 203 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 36-11-19-442-007
 3.  Activate the PRV (Fig. 201)________________
　
中國航空網(wǎng) www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 氣動系統(tǒng) PNEUMATIC SYSTEM(116)