NOTE: A manual assist may be necessary to release the uplock
____ assembly to the gear down position. This must be done before any further hydraulic operation of the wing gear.
S 715-045
(5) Make sure that the rig pin (AE/GD-7 (LH), AE/GD-8 (RH)) can be freely inserted in the uplock actuator cam (Fig. 501).
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747-400 MAINTENANCE MANUAL
S 715-021
(6)
Do a test of the door unlock switch alternate extend circuitry.
(a)
Manually place the left (right) uplock assembly in the locked up position.
(b)
Manually place the left (right) wing gear door to 30 |5 degrees from the fully closed position.
(c)
Set the wing gear alternate extension switch on the P2-3 landing gear control panel to the "ON" (extend) position.
(d)
Make sure that the left (right) alternate extension rotary actuator begins to rotate and stops in mid-cycle.
(e)
Make sure that the gap between the uplock crank overcenter stops and uplock assembly link measures no greater than 0.125 inches.
S 715-024
(7) Slowly lower the left wing gear door and make sure that the rotary actuator starts to turn again at about 40 degrees and continues to operate throughout the door swing until it is fully open.
NOTE: A manual assist may be required to release the uplock
____ assembly to the gear down position. This must be done before any further hydraulic operation of the wing gear.
S 865-025
(8)
Set the wing gear alternate extension switch on the P2-3 landing gear control panel to the "OFF" position.
G.
Restore Airplane to Normal
S 865-026
(1)
Make sure that each ALT GEAR EXT switch on the landing gear control panel is set to OFF.
S 865-027
(2)
Close the following circuit breakers:
(a)
P6 Main Power Distribution Panel
1) 6C28 ALT LG EXT NOSE
2) 6C29 ALT LG EXT WING L
3) 6C30 ALT LG EXT WING R
4) 6C31 ALT LG EXT BODY L
5) 6C32 ALT LG EXT BODY R
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A 747-400 MAINTENANCE MANUAL
(3) S 865-028Make sure that the forward wing landing gear door is in the full open position.
NOTE:____ Following a wing gear door alternate extension a manual assist of door to the full open position may be necessary.
(4) S 865-029Unlock the left (right) ground door release handle and place it in the locked down (doors open) position (AMM 32-00-30/201).
(5) S 415-030Do this task: "Body Landing Gear Door Operator Rods Connection" (AMM 32-33-28/401).
(6) S 865-031Remove system No. 1 and 4 hydraulic power if no longer necessary (AMM 29-11-00/201).
(7) S 865-032Remove electric power if no longer necessary (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
DOOR GROUND RELEASE HANDLE MECHANISM - REMOVAL/INSTALLATION
___________________________________________________________
1. General
_______
A. This procedure has two tasks:
(1)
The removal of the ground release handle for the landing gear doors
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