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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

 C. Access
 (1)  
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Container Compartment

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

 D.
Procedure

 S 726-038
 (1)  
Do a check of the lift actuator.

 (a)  
Open the door electrically (Ref 52-34-00/001).

 (b)  
Make sure the actuator arms do not touch the structure (Detail A).

 (c)  
Close the door electrically (Ref 52-34-00/001).

 (d)  
Make sure the actuator arms do not touch the structure (Detail A).

 S 726-039
 (2)  
Make sure there is not a load on the actuator links.

 (a)  
Hold the actuator links with both hands.

 (b)  
Make sure the actuator link turns around its axis.

 S 726-040
 (3)  
Do a check of the latch actuator with the door closed.

 (a)  
Put the torque wrench in the manual drive socket of the actuator.

 (b)  
Make a mark on the door to show the position of the torque wrench handle.

 NOTE: This position is where the actuator stops after
____
 it operates electrically.

 (c)  
Turn the torque wrench five turns in the OPEN direction.

 (d)  
Turn the torque wrench five turns in the CLOSE direction.

 (e)  
Make a note of the torque that is necessary to move the actuator.

 (f)  
Turn the torque wrench slowly in the CLOSE direction.

 (g)  
Make sure you can turn the torque wrench 2 full turns before the actuator hits the internal stops.

 NOTE: The actuator has hit the stops when the torque
____ increases 15 to 20 pound-inches during one-half turn of the wrench.
 S 726-041
 (4)  
Do a check of the hook actuator with the door closed.

 (a)  
Put the torque wrench in the manual drive socket of the actuator.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-34-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  Make a mark on the door to show the position of the torque wrench handle.
 NOTE: This position is where the actuator stops after
____
 it operates electrically.

 (c)  
Turn the torque wrench five turns in the OPEN direction.

 (d)  
Turn the torque wrench five turns in the CLOSE direction.

 (e)  
Make a note of the torque that is necessary to move the actuator.

 (f)  
Turn the torque wrench slowly in the CLOSE direction.

 (g)  
Make sure you can turn the torque wrench 2 full turns before the actuator hits the internal stops.

 NOTE: The actuator has hit the stops when the torque
____ increases 15 to 20 pound-inches during one-half turn of the wrench.
 S 726-042
 (5)  Do a check of the hook operation.
 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.
 (a)  
Open the door electrically.

 (b)  
Look at the hooks from inside the cargo compartment while the door moves.

 (c)  
Make sure the hooks do not get caught on the pins as the door opens.

 S 726-043
 (6)  
Do a check of the latch actuator with the door in the open position.

 (a)  
Put the torque wrench in the manual drive socket of the actuator.

 (b)  
Make a mark on the door to show the position of the torque wrench handle.

 NOTE: This position is where the actuator stops after
____
 it operates electrically.

 (c)  
　
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