S 414-018

 (2)  
Close the access panel for the applicable pack (Ref 06-09-03/201):

 (a)  
191N-L for the packs 1 and 2

 (b)  
191H-R for the pack 3

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A
747-400 MAINTENANCE MANUAL
 RAM AIR INLET DOOR TORQUE SHAFT - REMOVAL/INSTALLATION
______________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task is the removal of the torque shaft for the ram air inlet door. The second task is the installation of the torque shaft.
 B.  The removal of the torque shaft has these steps:
 -
Remove the forward section of the inlet door

 -
Remove the links

 -
Remove the torque shaft

 C.  The installation of the torque shaft has these steps:
 -
Install the torque shaft

 -
Install the links

 -
Install the forward section of the inlet door.

 TASK 21-62-11-004-001
 2.  Ram Air Inlet Door Torque Shaft Removal (Fig. 401)_______________________________________
 A.  References
 (1)
06-09-02/201, Body Section 42 Access Doors and Panels

 (2)
21-62-02/401, Ram Air Inlet Door

 (3)
21-62-03/401, Ram Air Inlet Door Actuator

 (4)
IPC 21-62-14 Fig. 1

 B.  Access
 (1)  
Location Zone 123 Wing to Body Fairing, Forward Lower Half, LH 124 Wing to Body Fairing, Forward Lower Half, RH

 (2)  
Access Panel
 191V-L WING/BODY FAIRING SEC 42 (Pack 1)
 191Z-L WING/BODY FAIRING SEC 42 (Pack 2)
 192V-R WING/BODY FAIRING SEC 42 (Pack 3)

 C.  Prepare to Remove the Torque Shaft
 S 014-011
 (1) Open the access panel for the applicable pack (Ref 06-09-02/201):
 (a) 191V-L for the pack 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SEE  A 
RAM AIR INLET (TYPICAL) 
RAM AIR INLET DOOR 
SEE TORQUE SHAFT B 

A

BOLT, WASHERS,  TORQUE  SHIM 
AND NUT (2 PLACES)  SHAFT  LONG 
SPACER 

BOLT, WASHER, AND NUT
BELLCRANK SPACER SHORT BEARING RETAINER ASSEMBLY
ACTUATOR LINK
B
Ram Air Inlet Door Torque Shaft Installation Figure 401
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A
747-400 MAINTENANCE MANUAL
 (b)  
191Z-L for the pack 2

 (c)  
192V-R for the pack 3

 S 864-012
 (2)  
Put the PACKS (1,2 or 3) switch to OFF, on the P5 overhead panel for the applicable pack (1,2 or 3).

 S 864-013

 (3)  
Put a DO-NOT-OPERATE tag on the PACKS switch.

 S 864-014

 (4)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel
 1) 6F35, PACK TEMP CONT A
 2) 6F36, PACK TEMP CONT B

 (b)  
P415 Power Distribution Center - Right
 1) 415C38, PACK TEMP CONT B
 2) 415K27, PACK TEMP CONT A

 D. Remove the Torque Shaft
 S 014-015
　
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