D.
Deactivate the Fan Air Modulating Valve

 S 042-003
 (1)  
Remove the positioning screw from the actuator housing.

 (a)  
Remove the O-ring.
 1) Discard the O-ring.

 (b)  
Do not disconnect the retaining cable from the positioning screw.

 S 042-004
 (2)  
Turn the locking crank to the 45° position.

 S 042-005

 (3)  
Install the positioning screw in the locking crank until it is engaged with the switch bracket.

 NOTE: This will lock the valve in the 45° position.
____
 S 412-017
 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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 36-12-04
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A
747-400 MAINTENANCE MANUAL
 (4)  
Close the right thrust reverser (Ref 78-31-00/201).

 S 412-018

 (5)  
Close the right core cowl panel (Ref 71-11-06/201).

 S 412-019

 (6)  
Close the right fan cowl panel (ref 71-11-04/201).

 TASK 36-12-04-442-007
 3.  Activate the Fan Air Modulating Valve (Fig. 201)_____________________________________
 A. Consumable Materials
 (1)  D00244 Anti-Seize, Silver Goop
 B. References
 (1)  
71-11-04/201, Fan Cowl Panels

 (2)  
71-11-06/201, Core Cowl Panels

 (3)  
78-31-00/201, Thrust Reverser System

 C. Access
 (1)  
Location Zone 412 Engine 1 - High Pressure Compressor Case 12:00 422 Engine 2 - High Pressure Compressor Case 12:00 432 Engine 3 - High Pressure Compressor Case 12:00 442 Engine 4 - High Pressure Compressor Case 12:00

 (2)  
Access Panel
 416 Right Thrust Reverser Half - Engine 1
 426 Right Thrust Reverser Half - Engine 2
 436 Right Thrust Reverser Half - Engine 3
 446 Right Thrust Reverser Half - Engine 4

 D. Prepare to Activate the Fan Air Modulating Valve
 S 042-021
 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.
 (1)  Do the deactivation procedure for the thrust reverser for ground maintenance (Ref 78-31-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01P Page 204 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 012-022
 (2)  
Open the right fan cowl panel (Ref 71-11-04/201).

 S 012-023

 (3)  
Open the right core cowl panel (Ref 71-11-06/201).

 S 012-024
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU OPEN THE THRUST REVERSER, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  
Open the right thrust reverser (Ref 78-31-00/201).

 E.
Activate the Fan Air Modulating Valve

 S 442-009
 (1)  Remove the positioning screw from the locking crank.
 NOTE:____The valve is spring-loaded to the OPEN position. It can be necessary to apply a torque to the locking crank to the CLOSED position to make the removal of the positioning screw easier.
 S 432-025
 (2)  
Install a new O-ring on the positioning screw.

 S 642-026

 (3)  
Use the antiseize compound to lubricate the threads of the
 positioning screw.

 S 432-027

 (4)
Install the positioning screw in the port of the actuator housing.
　
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