Main Gear Manual Extension System Cable Installation 508
32-34-31 Figure 401 (Sheet 1) Jun 20/92
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
528 Main Gear Manual Extension System Cable Installation
Jun 20/90 Figure 401 (Sheet 2) 32-34-31
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
4. Install Main Gear Manual Extension System Cables
A. Install system cables. For general cable installation information to be used in conjunction with the following steps (Ref Control Cables - Chapter 20).
NOTE: See Fig. 401 for cable lengths and fittings. Turnbuckles are located at approximately body station 420.
B. On airplanes with rig pin, install rigging pin (10) through quadrant (11) assembly and quadrant support (12) (view 1).
C. Attach cable MLGEA on quadrant assembly (11) and install cotter pin. Bend end of cotter pin into drum (4).
D. Install cable guard (5) in control drum (4).
E. Install cable guard pins (9) in quadrant assembly (11).
F. Attach cable MLGEA on control drum (4) and install cable retainer (Detail A).
G. Feed terminal end of manual extension handle cable through hole in V-slot and attach cable on control drum (4) and install cotter pin. Bend one end of cotter pin into drum.
H. Connect cable MLGEA at turnbuckle (l).
I. On airplanes with rigging pin, rig cable to 100 pound rig load.
NOTE: When performing step I, check that release handle is properly seated in V-slot of manual extension control (Detail A).
J. Adjust manual extension system per 32-34-0.
K. Test manual extension system per 32-34-0.
5. Restore Airplane to Normal
A. Install pressure seals in main gear wheel well (Ref Control Cable Air Pressure Seal - Chapter 20, Fig. 401, view 1).
B. Install cargo compartment ceiling panels.
508
32-34-31 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/88
NOSE GEAR MANUAL EXTENSION SYSTEM - DESCRIPTION AND OPERATION
1. General
A. The nose gear manual extension system is used to lower the nose gear when hydraulic system pressure is not available. Pulling the manual extension handle for the nose gear transmits motion through drums and cables to unlock the gear from the up and locked position. When the nose gear is released from the up and locked position, the gear wil1 free fall to the down and locked position.
B. Controls for nose gear manual extension are located in the floor of the control cabin immediately aft and to the right of the aisle stand (Fig. 1). Three controls, one for the nose gear and one for each main gear, are installed in the control cabin floor protected by an access door. The landing gear control handle must be either in neutral or down position to prevent hydraulic lock during manual extension. A single pull of approximately 70 pounds on the manual extension handle releases the nose gear lock mechanism to allow the gear to extend. A return spring attached to the torque tube quadrant assembly, and to the structure will return the system to its original position, when the handle is released. The landing gear position and warning lights function normally during manual extension operation.
2. Nose Gear Manual Extension Control Cable
A. The nose gear manual extension control cable is connected to the manual extension control drum installed beneath the control cabin floor and routed beneath the cabin floor through pulleys and eyebal1-type pressure seals to the nose gear manual extension release mechanism in the nose gear wheel well (Fig. 2). When the manual extension handle is pulled to release the gear, the motion is transmitted by the control cable to the nose gear manual extension release mechanism. Motion supplied to the release mechanism unlocks the nose gear lock mechanism to allow the nose gear to fall to down and locked position.
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