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S 014-023-N00
 (2)  Open the left fan cowl panel (AMM 71-11-04/201).
 S 044-024-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.
 (3)  
Do this procedure: Thrust Reverser Deactivation for Ground Maintenance (AMM 78-31-00/201).

 S 014-025-N00

 (4)  
Open the left core cowl panel (AMM 71-11-06/201).

 S 014-026-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.
 (5)  
Open the left thrust reverser (AMM 78-31-00/201).

 S 034-020-N00

 (6)  
Remove the shutoff valve (1):

 (a)  
Disconnect the electrical connector DV353 (7) from the shutoff valve receptacle.

 (b)  
Disconnect the pneumatic tube (6) from the shutoff valve (1).

 (c)  
Remove the screw (4) and the nut (3) that hold the bonding jumper (5) to the shutoff valve (1).

 (d)  
Remove two clamps (2) that hold the shutoff valve (1) to the nacelle zone ventilation duct.

 (e)  
Remove the shutoff valve (1).

 (f)  
Install covers to the valve openings, pneumatic tube (6), and electrical connector (7) to prevent contamination.

 

 TASK 75-23-02-404-009-N00
 3. Nacelle Zone Ventilation Shutoff Valve Installation (Fig.___________________________________________________401)
 A. Standard Tools and Equipment
 (1)  Bonding Meter (AMM 20-22-01/601)
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 75-23-02
 ALL  ú ú N01 Page 403 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
B. Parts
 ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Nacelle Zone Ventilation Shutoff | 75-23-02 | 01 | 215 | | | | Valve | | | | 2.....….........…...................................…..........…......…........1
 C. References
 (1)  
AMM 20-11-15/401, Bonding Jumpers and Ground Leads

 (2)  
AMM 20-22-01/601, Electrical Bonding

 (3)  
AMM 71-11-04/201, Fan Cowl Panel

 (4)  
AMM 71-11-06/201, Core Cowl Panel

 (5)  
AMM 78-31-00/201, Thrust Reverser System

 (6)  
WDM 75-23-11, 75-23-21

 (7)  
SSM 75-23-01

 D.
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 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

 E.
Procedure

 S 434-010-N00
 (1)  
Remove the covers that prevent contamination.

 S 434-021-N00

 (2)  
Install the shutoff valve (1):

 (a)  
Before you install the shutoff valve (1), make sure the cotter pin holds the lockpin in its position.

 NOTE: If you do not install the cotter pin, the lockpin will
____ be pushed. With the lockpin pushed, the shutoff valve will be manually locked in the open position.
 (b)  Put the valve clamps (2) on the duct to the left and right sides of the installed shutoff valve (1).
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 75-23-02
 ALL  ú ú N01 Page 404 ú Jun 18/99
　
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