S 094-021
 (12)
 Remove the temporary brace.

 S 724-022

 (13)
 Do a test of the manual operation of the lift actuator.

 (a)  Manually turn the lift actuator 50 turns clockwise.
 (b)  Make sure the two rotary actuators start to move at the same
 time to open the door.
 (c)  Manually turn the lift actuator 50 turns counterclockwise.
 (d)  Make sure the two rotary actuators move to close the door at
 the same time.
 (e)  Open the door manually until one rotary actuator touches its
 upstop.
 NOTE: You can not always close the door if the rotary____
 actuator hits the upstop heavily. If this occurs, do
 one of these steps:
 - If possible, use electrical power to close the
 door or,
 - Manually, lightly lift up on the bottom edge of
 the door. At the same time, turn the manual
 drive counterclockwise to close the door.
 (f)  Move the door until there is a clearance between the rotary
 actuator and the upstop of 0.10 to 0.13 inch.
 NOTE: Measure this clearance on the same rotary actuator____
 that touched its upstop.
 (g)  Make sure the clearance between the other rotary actuator and
 its upstop is from 0.10 to 0.20 inch.

 S 864-023
 (14)
 Close these circuit breakers :

 (a)  
P59 Aft Equipment Panel 1) AFT CARGO DOOR POWER UNITS

 (b)  
P414 Power Distribution Center - Left 1) 414A21 LOWER CARGO DOOR FWD 2) 414F15 CARGO DOOR CONTROL FWD 3) 414F16 CARGO DOOR CONTROL AFT

 S 724-024
 (15) Do a test of the electrical operation of the lift actuator.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

 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)  
Operate the door electrically to its full open position.

 (b)  
Make sure the clearance between one rotary actuator and its upstop is from 0.10 to 0.13 inch (Fig. 401).

 (c)  
Make sure the clearance between the other rotary actuator and its upstop is from 0.10 to 0.20 inch.

 (d)  
Make sure you cannot turn the lift links around their axes with your hand .

 CAUTION: DO NOT OPERATE THE LIFT ACTUATOR FOR AT LEAST 1 MINUTE
_______ AFTER YOU OPEN THE DOOR. OPEN AND CLOSE THE DOOR ONLY ONCE IN TEN MINUTES. THIS WILL PREVENT TOO MUCH HEAT THAT CAN DAMAGE THE LIFT ACTUATOR.
 (e)  
Close the cargo door.

 (f)  
Make sure there is a 0.01 inch minimum clearance between the rotary actuator and its downstop (Fig. 401).

 (g)  
Make sure you can turn the lift actuators around their axes with your hand.

 S 414-025
 (16) Install the ceiling panel it was necessary to remove for access (AMM 25-52-01/401).
 TASK 52-34-02-714-038
 4.  Do an operational check of the lift mechanism for the forward/aft cargo door____________________________________________________________________________ to verify manual drive_______________________
 NOTE: This is a scheduled maintenance task.
____
 A.  References
 (1)  
AMM 25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings

 B.  
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

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