3.
A
747-400 MAINTENANCE MANUAL
LANDING GEAR - DESCRIPTION AND OPERATION
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General
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A. The landing gear system consists of the gear which support the airplane while on the ground; a gear extension and retraction system; an alternate gear extension system; wheels and brakes for each main gear; means for steering the airplane; gear and door indicating and warning system; and control and operation of the gear for landing, takeoff and ground movement.
Main Gear and Doors (Fig. 1) (Ref 32-10-00/001)
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A. Main Gear
(1)
The main landing gear consists of four main gear; two body gear and two wing gear. Each gear is comprised of a four-wheel truck. The body gear is located at station 1463.5 in the fuselage. The wing gear is located aft of the rear wing spar inboard of the engine nacelles at station 1342.5.
(2)
Landing impact is absorbed by five air-oil shock struts, functioning primarily as air springs. Rolling vibrations and variances in runway are absorbed by the hydraulic forces within the shock strut.
(3)
Body gear trucks are steerable, providing directional control in conjunction with the nose gear in sharp turns during low speed taxiing and towing. This capability also reduces tire scrubbing in sharp turns.
B.
Main Gear Doors
(1)
The landing gear doors consist of body gear doors and wing gear doors. The body and wing gear doors each have wheel well doors and shock strut doors. The wheel well doors are hydraulically actuated and can be closed with the gear extended or retracted. The shock strut doors are mechanically attached by linkage rods to the gear shock strut and move only when the gear is moved. All doors are of frame construction with skin paneling on the inner and outer sides. The doors close over all gear openings and fair with the fuselage contour to provide aerodynamic smoothness.
Nose Gear and Doors (Ref 32-20-00/001)
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A. Nose Gear
(1)
The nose landing gear is a steerable wheel assembly which supports the forward end of the airplane and provides directional control while on the ground. The gear is hydraulically actuated and retracts forward in the wheel well. Landing loads are absorbed by an air-oil shock strut. Steering is provided by hydraulically actuated cylinders. The airplane can be towed forward or aft from the nose gear.
B.
Nose Gear Door
(1)
The nose gear doors are clamshell type and consist of four doors that fair with the fuselage contour when closed. All doors are of alclad rib and skin construction.
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32-00-00
ALL ú ú 01 Page 1 ú Oct 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
Landing Gear Location
Figure 1 (Sheet 1)
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32-00-00
ALL ú ú 01 Page 2 ú Oct 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
LANDING GEAR GEOMETRY
Landing Gear Location
Figure 1 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 起落架 LANDING GEAR 1(10)
