52-34-24
ALL ú ú 01 Page 406 ú Feb 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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52-34-24
ALL ú ú 02 Page 407 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
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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52-34-24
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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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