(a)
Bend the end of the cotter pin into the drum (4).
S 424-014
(3)
Install the cable guard (5) in the control drum (4).
S 434-015
(4)
Install the cable guard pins (9) in the quadrant assembly (11).
S 434-016
(5)
Attach the cable MLGEA on the control drum (4) and install the cable retainer.
S 434-017
(6)
Put the terminal end of the cable of the manual extension handle through the hole in the V-slot.
(a)
Attach the cable on the control drum (4) and install the cotter pin.
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(b) Bend one end of the cotter pin into the drum.
S 434-018
(7)
Connect the cable MLGEA at the turnbuckle (1).
S 824-019
(8)
Adjust the manual extension system (Ref 32-34-00/501).
S 714-020
(9)
Do a test on the manual extension system (Ref 32-34-00/501).
E.
Put the Airplane in Its Usual Condition
S 434-021
(1)
Install the pressure seals on the wheel well of the main landing gear (Ref 20-10-04/401).
(2)
Install the ceiling panels of the cargo compartment.
S 414-022
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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 a drum and cable to unlock the gear from the up and locked position. When the nose gear is released from the up and locked position, the gear will 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 80 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 the 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 eyeball-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.
3. Nose Gear Manual Extension Release Mechanism____________________________________________
A. The nose gear manual extension release mechanism is located in the aft ceiling area of the nose gear wheel well (Fig. 2). Motion to release the nose gear is transmitted by a cable to a torque tube. A roller is attached eccentrically to the torque tube. As the torque tube rotates, the roller contacts an extension of the nose gear lock link. As the roller is forced against the lock link extension, a force is applied to move the lock strut from the overcenter (locked) position and the nose gear will free fall to the down and locked position. A stop attached to the torque tube contacts structure to prevent further control cable movement after the torque tube has been rotated approximately 100 degrees. A return spring attached to the quadrant assembly and to the structure will return the system to the original position when the handle is released.
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本文链接地址：737-300 400 500 AMM 飞机维护手册 起落架 LANDING GEAR 2(139)
