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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
CABLE TENSION (POUNDS)
160
150
140
130
120
110
100
90
80
70
AMBIENT TEMPERATURE (`F)
Cable Tension for the Ground Door Release Figure 402
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747-400
MAINTENANCE MANUAL
B. References
(1)
20-11-02/401, Cable Turnbuckle Locking Clips
(2)
29-11-00/201, Main Hydraulic Supply System
(3)
32-00-30/201, Landing Gear Door Locks
(4)
32-36-00/501, Wing Gear Alternate Extension System
(5)
IPC 32-35-03 Fig. 1
C.
Access
(1)
Location Zones
137 Body Landing Gear Wheel Well, LH
138 Body Landing Gear Wheel Well, RH
D.
Install the Ground Release Handle (Fig. 401)
S 034-013
(1)
Make sure the door operator rods for the wing and body gear are disconnected from the doors (Ref 32-00-30/201).
S 864-014
(2)
Make sure the door actuators are in the "Doors Closed" position.
S 864-015
(3)
Make sure that the ground release handle is in the "Unlocked" position.
S 984-026
(4)
Put the differential drums on the stops. Turn the left differential drums counterclockwise (right differential drums clockwise) against the stops. Look from the end of the shafts with the output cranks when you do this.
S 424-027
(5)
Put the ground release handle in its position on the keel beam and install the five bolts that attach it.
S 494-028
(6)
Make sure the rig pins AE/GD-3 (LH) or AE/GD-4 (RH) are installed in the ground release handle.
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747-400 MAINTENANCE MANUAL
(7) S 494-029Make sure the rig pins AE/GD-5 (LH) or AE/GD-6 (RH) are installed in the bus quadrant.
(8) S 434-030Put the cables through the pulleys at the rear of the handle mechanism.
(9) S 434-031Connect the left and right cables to the handle quadrant and install the cotter pins.
S 434-032
(10)
Use the turnbuckles that are forward of the handle near the keel beam to tighten the cables.
S 824-033
(11)
Adjust the tension of the cables that follow to the value shown in Fig. 402.
GDR7A (LH), 8A (RH) GDR7B (LH), 8B (RH)
S 094-034
(12)
Remove the rig pins AE/GD-3 (LH) and AE/GD-4 (RH) from the release handle.
S 094-035
(13)
Remove the rig pins AE/GD-5 (LH) and AE/GD-6 (RH) from the bus quadrant.
S 434-017
(14)
Install the turnbuckle lock clips (Ref 20-11-02/401).
S 864-018
(15)
Move the ground release handle to the "Doors Open" position.
S 414-019
(16)
Connect the operator rods for the wing and body gear doors to the doors (Ref 32-00-30/201).
S 864-020
(17)
Remove the pressure from hydraulic systems No. 1 and No. 4 (Ref 29-11-00/201).
S 714-021
(18)
Do an operational check of the mechanism for ground release of the main landing gear doors (Ref 32-36-00/501).
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