52-34-24
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

9. STRUCTURE FRAME

1.30 |0.03 INCHES
10. SPACER WASHERS
HOOK PIN LENGTH INITIAL SETTING
Hook Pin Length Initial Setting
Figure 402

H14684
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 S 864-034
 (2)  
Remove the access panel at the location of the hook pin that you want to replace.

 S 934-055

 (3)  
Use a felt tip pen or spray paint to mark the exact position of the inside and outside bearing housings (1 and 2).

 NOTE: This is to make sure that the bearing housings can be
____ installed in exactly the same position that they originally were.
 S 024-056
 (4)  
Use a hexagon wrench to stop the pin from turning and remove the nut (3) and washer (4) from the back of the pin (5).

 S 024-057

 (5)  
Remove the nuts (6) and washers (7) from the bolts (8) which hold the inside bearing housing to the door cutout frame (9).

 S 024-058

 (6)  
Remove the inside bearing housing and the hook pin. Remove the spacer washers (10) and washer (11) from the pin.

 NOTE:____Record the number of spacer washers which are removed. This will make it easier when you install the new hook pin.
 TASK 52-34-24-424-036
 5. Install the Cargo Door Hook Pin (Fig 402)
 A. References
 (1)  
AMM 52-34-00/001, Forward/Aft Cargo Doors

 (2)  
AMM 52-34-00/501, Forward/Aft Cargo Doors - adjustment/test

 B.
Access

 (1)  
Location Zone
 122 Forward Cargo Container Compartment
 142 Aft Cargo Container Compartment

 (2)  
Access Panel
 821R Door - Forward Cargo Compartment
 821AR Cargo Door Maintenance Access Panel
 821FR Cargo Door Maintenance Access Panel
 822R Door - Aft Cargo Compartment
 822AR Cargo Door Maintenance Access Panel
 822FR Cargo Door Maintenance Access Panel

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747-400 MAINTENANCE MANUAL
 C. Procedure
 S 424-059
 (1)  Assemble the washer (11) and the same number of spacer washers (10) that were previously removed, onto the hook pin (5).
 NOTE: If a -1 hook pin was removed and a -2 pin is being installed,
____ additional spacer washers (0.30 inch thickness) must be assembled onto the pin to make up for the shorter pin body length.
 S 424-060
 (2)  
Install the new hook pin (5) into the inside bearing housing (1) and assemble the washer (4) and nut (3) onto the hook pin.

 S 424-067

 (3)  
Use a hexagon wrench to hold the pin and tighten the nut to 95 - 110 inch-pounds.

 S 984-061

 (4)  
Position the inside bearing housing (1) on the inside of the structure frame (9) in exactly the same position that it was before removal.

 NOTE: The outside bearing housing must also be installed in exactly
____ the same position that it was before removal.
 S 424-062
 (5)  
Install the bolts (8) through the outside and inside bearing housings, assemble the washers (7) and nuts (6) onto the bolts and tighten the nuts to 90 - 110 inch pounds.

 S 714-039

 (6)  
Measure the length of the hook pin from the face of the bearing housing to the end of the hook pin as shown (Fig. 402).

 NOTE: After a pin length has been initially set, the only pin that
____ may require adjustment is the aft cargo door, forward pin.
 S 224-063
 (7)  Check that the clearance between the end of the hook pin and the pull-in hook is within the required limits (AMM 52-34-00/501).
　
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