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 32-CONTENTS

 GUN Page 23 Sep 28/01
 
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757 MAINTENANCE MANUAL
 LANDING GEAR - DESCRIPTION AND OPERATION
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 1.  General_______
 A.  The landing gear system is a combination of sub-systems which provide control and support of the airplane while on the ground. The system includes the main and nose landing gear, an extension and retraction system, braking, steering, and a position indicating system (Fig. 1).
 2.  Component Details_________________
 A.  Air/Ground Relays (AMM 32-09-00)
_________________
 (1)  
Proximity sensors on the nose and main landing gear and truck positioner hydraulic inlet pressure switches provide inputs to the proximity switch electronics unit (PSEU) to indicate whether the airplane is on the ground or in the air. The PSEU controls air/ground relay switching which controls the various airplane systems for air or ground mode operation.

 B.  
Main Landing Gear and Doors (AMM 32-10-00)

___________________________
 (1)  
The main landing gear consists of two gears and associated doors which support approximately 85 per cent of the airplanes' weight. The gears are located under the wing, inboard of the engine nacelles.

 C.  
Nose Landing Gear and Doors (AMM 32-20-00)

___________________________
 (1)  
The nose landing gear consists of one nose gear and associated doors which supports the nose of the airplane. The gear is located near the nose of the airplane beneath the flight deck.

 D.  
Extension and Retraction (AMM 32-30-00)

________________________
 (1)  
The extension and retraction system consists of control cables, and hydraulic actuators and valves which control and operate landing gear movement.

 E.  
Wheels and Brakes (AMM 32-40-00)

_________________
 (1)  
The airplane is supported on the ground by wheel and tire assemblies mounted on the landing gear. The main gear wheels are equipped with brakes which aid in stopping the airplane.

 (2)  
An automatic brake control and antiskid protection system aids airplane braking (AMM 32-42-00).

 (3)  
GUN 051; a brake temperature monitor system monitors the temperatures of individual brakes and supplies this information to the flight crew (AMM 32-46-00).

 F.  
Steering (AMM 32-51-00)

________
 (1)  
Directional control of the airplane on the ground is provided by a nose wheel steering system. The system consists of control cables, and hydraulic actuators and valves which rotate the nose wheels.

 G.  
Position and Warning (AMM 32-61-00)

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 (1)  The position and warning system monitors and indicates the status of landing gear and doors positon as a check for proper operation. Sensors on the gears and doors monitor the position, and the information is displayed by indicator lights in the flight deck.
 
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A
757
MAINTENANCE MANUAL

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 ALL  ú ú 03 Page 2 ú Jan 28/02
 
UP
OFF
DOWN
ALTERNATE
HYDRAULIC POWER LEFT HYDRAULIC
EXTENSIONGROUND LOCKOUT
TRANSFER UNIT SYSTEM POWER
SYSTEM LANDING GEAROVERRIDE CONTROL LEVERMODULE
PROXIMITY SWITCHELECTRONICS UNIT
　
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本文鏈接地址：757 AMM 飛機維護手冊 起落架 CHAPTER 32 - LANDING GEAR 1(10)