(3)  
Remove the safety screen.

 S 024-005
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 MAINTENANCE MANUAL
ACCESS DOOR
SEEA  SEEA
SAFETY
SCREEN

CONNECTING ROD
BONDING
JUMPER
ACTUATOR ROD

OUTFLOW
VALVE
ASSEMBLY

STEPPED BOLT, WASHER
AFT FORWARD
FLAPPER FLAPPER
DOOR DOOR
BONDING JUMPER
ROD END,
(2 LOCATIONS)
BOLT,
WASHER

A
Pressurization Outflow Valve Flapper Door Installation
Figure 401

G04800
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A
747-400 MAINTENANCE MANUAL
 S 034-006
 (4) Remove the cotter pin, nut and washer from the stepped bolt.
 NOTE: Outflow valve may be in any position except stalled closed.
____ If stalled closed, stepped bolt cannot be removed.
 S 034-007
 (5)  Remove the bolt to release the actuator rod and the connecting rod.
 (a)  Keep the shims, washers and nuts.
 S 034-008
 (6)  
Remove the cotter pin, nut and washer from the opposite end of the connecting rod.

 S 034-009

 (7)  
Remove the bolt and the connecting rod.

 S 034-010

 (8)  
Remove the opposite connecting rod.

 S 034-011

 (9)  
Disconnect the bonding jumper from the doors.

 S 024-012

 (10)
 Remove the hinge bolts and the flapper doors.

 (a)  Keep the shims, nuts, washers and the bolts.
 TASK 21-31-09-404-002
 3. Outflow Valve Flapper Doors Installation (Fig. 401)
________________________________________
 A. Equipment
 (1)  Sandpaper, 400 to 600 grit Aluminum Oxide - Commercially available
 B. Consumable Materials
 (1)  B00148 solvent, Methyl Ethyl Ketone (MEK)
 C. References
 (1)  
AMM 21-31-00/501, Cabin Pressure Control System

 (2)  
24-22-00/201, Manual Control

 (3)  
WDM 21-31-13, 21-31-21, 21-31-22

 (4)  
SSM 21-31-02, 21-31-04

 D. Access
 (1)  Location Zone
 151 Area Aft of Bulk Cargo Compartment, LH
 152 Area Aft of Bulk Cargo Compartment, RH

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A
747-400 MAINTENANCE MANUAL
 E. Procedure
 S 424-013
 (1)  Install the aft door on valve frame with one thin aluminum alloy washer on each side of the spherical bearings, and hinge bolts inserted loosely.
 (a)  Adjust the door so that gaps between the frame and the door are equal.
 S 424-014
 (2)  Add the solid shims to the outboard sides of the hinge spherical bearings, between washers and door, to obtain a clearance of 0.02 to
 0.03 inch (0.5 to 0.76 mm) between shims and door at each end.
 S 434-015
 (3)  
Install the nuts and tighten to 10 to 15 inch-pounds (1.1 to 1.7 Newton-meters) above running torque.

 S 434-016

 (4)  
Install the cotter pins.

 S 424-017

 (5)  
Install the forward door as shown in steps 1 thru 3.

 S 434-018

 (6)  
Put the stepped actuator rod bolt through door and actuator rod with washer under head and shims on outboard side of actuator connecting rod to restrict side play of actuator rod to 0.002 inch (0.05 mm) maximum.
　
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