52-34-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (h)  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.
 (i)  
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).

 (j)  
Adjust the hook mechanism if it is necessary (Ref 52-34-00/501).

 S 416-013
 (18)
 Close the door, but do not close the master latch lock handle.

 S 216-058

 (19)
 Do a check of the master latch lock mechanism (Detail C).

 (a)  
Use the spring scale to push the handle to the closed position.

 (b)  
Make sure the force you measure is not more than 45 pounds.

 (c)  
Make sure the pressure relief doors move correctly while you move the handle.

 (d)  
Make sure the EICAS messages "FWD CARGO DOOR" or "AFT CARGO DOOR" do not show.

 S 826-035
 (20)
 Adjust the master latch lock mechanism if it is necessary (Ref 52-34-00/501).

 S 866-036

 (21)
 Put the master latch lock handle in the open position.

 S 226-015

 (22)
 Measure the distance from the cargo door to the pressure relief door (section C-C).

 NOTE: If the checks above are satisfactory, you can accept a
____
 minimum dimensions of 7.0 inches.

 TASK 52-34-00-206-022
 3. Examine the Forward/Aft Cargo Door Latch Mechanism (Fig.__________________________________________________601)
 A. Access
 (1)  
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Container Compartment

 (2)  
Access Panels
 821R Door - Forward Cargo Compartment
 822R Door - Aft Cargo Compartment

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 52-34-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (3)  References
 AMM 52-34-00/501
 AMM 52-34-01/601

 B. Procedure
 S 866-061
 CAUTION:_______IN CASE THE DOOR DOES NOT OPEN, STOP IMMEDIATELY. DO NOT OPERATE THE DOOR CONTROL SWITCH. HOLDING THE DOOR CONTROL SWITCH MAY DAMAGE THE ACTUATOR. WAIT AT LEAST 1 MINUTE BEFORE SECOND ATTEMPT. IF THE DOOR STILL DOES NOT OPEN, WAIT AT LEAST 10 MINUTES BEFORE THIRD ATTEMPT.
 (1)  
Open the forward/aft cargo door to get access to the latch mechanism.

 S 216-018

 (2)  
Do a check of the midspan latch cams and latch pins for corrosion and deterioration (AMM 52-34-01/601).

 S 216-019

 (3)  
Check the lower latch cams and latch pins for corrosion and deterioration (AMM 52-34-01/601).

 S 216-060

 (4)  
If the latch pin assemblies (Fig. 603) do not have the retaining clips, make sure that the pins protrude (stick out) from the bearing plate side of the latch fittings.

 S 216-020

 (5)  
Do a check of all the pushrods, bearings, and torque tubes for corrosion and wear (Fig. 602).

 S 216-023

 (6)  
Make sure the torque tubes and push rods are correctly attached (AMM 52-34-00/501).

 (7)  
Close the forward/aft cargo door.

 S 866-021
 TASK 52-34-00-706-037
 4. Do a Check of the Cargo Door Electrical Components and Circuitry (Fig.________________________________________________________________601)
 A. Standard Tools and Equipment
 (1)
Torque wrench (with dial indicator) - 0-25 pound-inch range

 B.
References

 (1)  
52-34-00/001, Forward/Aft Cargo Door

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