C.
You do not have to remove the cargo door to remove the lift actuator.
D.
Before you remove the lift actuator, the airplane must be in one of these configurations:
(1)
The airplane is on its wheels and at its Operating Empty Weight
(2)
The airplane is on jacks
(3)
The airplane is on its wheels and has a fuel load.
NOTE: The fuel load must be approximately equal on each side
____ of the airplane. The maximum allowable difference is 5000 pounds between each side of the airplane.
TASK 52-34-02-004-001
2. Remove the Lift Actuator (Fig. 401)
________________________
A. References
(1)
AMM 25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings
(2)
AIPC 52-34-02
(3)
SSM 52-34-01, SSM 52-35-01
(4)
WDM 52-34-11, WDM 52-35-11
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
C.
Procedure
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52-34-02
ALL ú ú 01 Page 401 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
A
A
SEE A OUTBD
INTERNAL CONNECTION
FOR MANUAL OPERATION
LIFT
LINK
SEE B
FLEXIBLE SHAFT
TORQUE EXTERNAL
TUBE CONNECTION
FOR MANUAL
OPERATION
LIFT ACTUATOR INTERNAL CONNECTION FOR MANUAL OPERATION
A-A
Cargo Door Lift Actuator Figure 401 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
52-34-02
ALL ú ú 01 Page 402 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
ROTARY BRACE ACTUATOR
DOOR OPEN
DOOR CLOSED
B
Cargo Door Lift Actuator Figure 401 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
52-34-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 014-046
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 door until it hangs vertically.
(a)
If you cannot operate the lift actuator electrically or manually, open the door as follows: 1) Open the master latch lock handle. 2) Disconnect the swivel clamp from the actuator arm
(Fig. 402). 3) For the forward actuator on the aft door, disconnect the two clamps from the bracket also (Fig. 402). 4) Disconnect the lift links from the support fittings.
NOTE: Do not change the length of the lift links.
____
WARNING: USE SUFFICIENT FORCE TO MAKE THE DOOR MOVE SLOWLY.
_______ WHEN YOU OPEN THE HOOKS AND LATCHES, THE DOOR CAN MOVE QUICKLY OUTBOARD. IF THE DOOR MOVES QUICKLY, IT CAN CAUSE INJURY OR DAMAGE.
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.
5) Put the control switch in the OPEN position.
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