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747-400 MAINTENANCE MANUAL
2) Put a torque wrench in the manual drive port of the hook acutator.
3) Make a mark on the door to show the position of the torque wrench handle.
NOTE:____ This position is where the actuator stop after it
operates electrically.
4) Turn the torque wrench 5 turns in the close direction.
5) Turn the torque wrench 5 turns in the open direction.
6) Make a note of the torque that is necessary to move the
actuator.
7) Turn the torque wrench slowly in the open direction
(counterclockwise).
8) Make sure there is more than one free turn before the
actuator hits the stops.
NOTE:____ The actuator hits the stops when the torque
increases 15-20 pound-inches during one-half turn of
the wrench.
9) Verify that the external stops have been contacted. If the
external stops are not contacted, the internal stops have
been contacted and you must adjust the door hook mechanism
Ref (AMM 52-34-00/501).
(bx) Operate the door in the close direction with the door control switch, until the door stops in the fully latched position.
(by) Put a torque wrench in the manual drive port of the hook actuator and do these steps: 1) Turn the actuator in the close direction (clockwise). 2) Make sure there is more than two turns before you touch the
internal stops. 3) Make sure the maximum torque necessary to turn the manual mechanism is not more than 35 inch-pounds.
(bz) Put a torque wrench in the manual drive of the latch acutator and do these steps: 1) Turn the actuator in the close direction (clockwise).
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A 747-400 MAINTENANCE MANUAL
2) Make sure there are three or more turns of the manual mechanism before the internal stops touch each other. 3) Make sure the maximum torque necessary to turn the manual mechanism is not more than 35 inch-pounds. (ca) Install the covers on the latch, hook and lift actuator manual drive ports.
(4) S 395-027Examine the door seals for damage. (a) Repair the seals if it is necessary (Ref 52-09-00/801).
(5) S 645-028When doors are open for the last time, lubricate the door latches (Ref 12-21-04/301).
(6) S 865-029Remove the electrical power if it is not necessary (Ref 24-22-00/201).
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747-400 MAINTENANCE MANUAL
FORWARD/AFT CARGO DOOR - INSPECTION/CHECK
_________________________________________
1. General_______
A. This procedure contains three tasks:
(1)
A check of the cargo door system
(2)
A check of the cargo door latch mechanism.
(3)
An Inspection/Check procedure for the master latch lock system.
TASK 52-34-00-206-001
2. Do a Check of the Forward/Aft Cargo Door System (Fig 601)_______________________________________________
A. Standard Tools and Equipment
(1)
Scale - Spring, 100-pound capacity
(2)
Wrench - Torque (with dial indicator), 0-25 pound-inch range (to do a check of the hook and latch actuators)
B.
References
(1)
52-34-00/001, Forward/Aft Cargo Door
(2)
52-34-00/501, Forward/Aft Cargo Door
(3)
52-34-01/401, Forward/Aft Cargo Door
(4)
AIPC 52-34-01, AIPC 52-34-03, AIPC 52-34-04 Fig. 1, AIPC 52-34-06, AIPC 52-34-07
C.
Access
(1)
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Container Compartment
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