5. Close-up
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Subtask 32-21-43-942-050
A. Removal of Equipment
(1)
Remove the warning notice(s).
(2)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
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1. General
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The doors of the nose landing gear include :
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2 fwd doors operated by a hydraulic actuating cylinder,
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2 aft doors connected by a rod to the gear and a leg door attached to the rear part of the gear leg.
-1 leg door closes the nose gear well when the gear is retracted.
(Ref. Fig. 001, 002, 003)
The structure of the nose gear doors is described in 52-82-00.
2.
Component Location
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(Ref. 32-00-00)
3.
Component Description
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A. Main Doors
(1)
The two main doors, which are symmetrical in relation to the centerline of the aircraft, close the gear well along much of its length. Each door hangs from three points on the structure of the aircraft. These two doors are connected mechanically to the aircraft by a linkage which has two control rods connected to the same bellcrank. This bellcrank is installed at the roof of the landing gear well and is operated by one double-acting actuating cylinder (opening and closing of the doors. In the closed position an uplock assembly latches the doors. (Ref. Fig. 002)
(2)
A by-pass valve, manually controlled by a lever releases the uplock latch on the ground. After the latch is released, the doors open under the effect of gravity. (Ref. Fig. 001) The doors are closed by the hydraulic system after the lever is put in the normal position.
(3)
Proximity detectors provide a signal when the doors are in the open position. The doors must be in this position to permit the gear to operate. Each door is equipped with two proximity detectors installed on separate brackets. (Ref. Fig. 003)
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Nose Gear Doors
Figure 001
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Nose Gear Doors - Operating Mechanism
Figure 002
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Nose Gear Doors - Proximity Switches
Figure 003
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B. Aft Doors (Ref. Fig. 004) The two aft doors are symmetrical and hang from two points on the structure of the aircraft. These two doors are also connected by an adjustable rod to the gear leg. A max in-service play of 5 mm (0.1968 in.) at the end of the door is permitted. These two doors close the aft part of the nose gear well when the gear is retracted. When the gear is extended, the doors remain open.
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Aft Doors
Figure 004
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C. Leg Door (Ref. Fig. 005) This door is attached at three points to the rear part of the gear leg. When the gear is retracted, this door closes off the area through which the drag strut passes when the gear is extended. This door includes two rollers. The main doors come against these rollers when the door closes after the gear retraction. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM LANDING GEAR 起落架3(131)
