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 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.
 (2)  Do this procedure: Thrust Reverser Deactivation for Ground Maintenance (AMM 78-31-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
HI-LOK AND COLLAR L-CLIP (4 LOCATIONS) (2 LOCATIONS)
INNER WALL OF THE LEFT THRUST REVERSER HALF
DUCT END
CLAMP CAP

CLAMP
SUPPORT
BRACKET

A
DUCT FOR NACELLE ZONE VENTILATION
HOSE CLAMP
0.50 INCH
(12.7 MM) HOSE
SCREW AND NUT (2 LOCATIONS) T-BOLT
SHUTOFF VALVE
A
FOR NACELLE ZONE VENTILATION
A
A-A
Nacelle Zone Ventilation Duct InstallationFigure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 014-021-N00
 (3)  Open the left core cowl panel (AMM 71-11-06/201).
 S 014-022-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.
 (4)  
Open the left thrust reverser (AMM 78-31-00/201).

 S 034-015-N00

 (5)  
Remove the ventilation duct:

 (a)  
Remove the clamp that holds the ventilation duct to the shutoff valve.

 (b)  
Loosen the hose clamp that holds the hose to the ventilation duct.

 (c)  
Disconnect the hose from the ventilation duct.

 (d)  
Remove the hi-loks and collars that hold the ventilation duct end cap to the L-clip.

 (e)  
Disconnect the ventilation duct end cap from the L-clip.

 (f)  
Remove the screws, nuts, and clamp that hold the ventilation duct to the support bracket, and remove the ventilation duct.

 

 TASK 75-23-03-404-007-N00
 3. Nacelle Zone Ventilation Duct Installation (Fig. 401)
__________________________________________
 A. References
 (1)  
AMM 71-11-04/201, Fan Cowl Panel

 (2)  
AMM 71-11-06/201, Core Cowl Panel

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

 (4)  
IPC 75-23-02 Fig. 1

 B.
Access

 (1)  
Location Zone 415 Engine 1 . Inner Wall of Left Thrust Reverser Half 425 Engine 2 . Inner Wall of Left Thrust Reverser Half 435 Engine 3 . Inner Wall of Left Thrust Reverser Half 445 Engine 4 . Inner Wall of Left Thrust Reverser Half

 (2)  
Access Panels
 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.
Procedure

 S 434-016-N00
 (1)  Install the ventilation duct:
 (a)  Put the clamp on the shutoff valve.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(b)  
Put the ventilation duct on the inner wall of the left thrust reverser.

 (c)  
Install the ventilation duct end cap to the L-clip with hi-loks and collars. 1) Tighten the collars.

 (d)  
Install the ventilation duct to the support bracket with the clamp, screws, and nuts. 1) Tighten the screws.
　
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