(10)
Tighten the installation bolts.
S 825-017
(11)
Do the adjustment procedure for the lever up switches until you get these conditions:
(a)
The switch is closed for the DN and the OFF position of the landing gear lever.
(b)
The switch is open for the UP position of the landing gear lever with the tolerances specified.
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737-300/400/500MAINTENANCE MANUAL
S 845-018
(12) Close the OUTBD ANTI-SKID, INBD ANTI-SKID and ANTI-SKID FAIL circuit breakers on the P6 panel.
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737-300/400/500MAINTENANCE MANUAL
AUTOMATIC BRAKING SYSTEM - DESCRIPTION AND OPERATION
____________________________________________________
1. General_______
A. When selected by the pilot the autobrake (automatic braking) system operates in conjunction with the antiskid system to automatically control hydraulic pressure to the brakes on landing or during a refused takeoff (RTO). Using information from air/ground and wheel speed sensing systems, a single electromechanical valve automatically supplies a modulated pressure to all four brakes. The autobrake control panel (P2-2) contains the controls by which the crew may choose the deceleration rate. Five deceleration rate positions (1, 2, 3, MAX, and RTO) are available. Shuttle valves react to autobrake pressure, blocking the normal brake metering system and porting autobrake pressure through the antiskid valves to wheel brake pistons. The antiskid system monitors autobrake (or normal brake application) in preventing wheel lock-up.
B. The pilot can override the autobrake system at any time by moving the autobrake selector switch to OFF, making manual brake application resulting in more than 750 psi at either left or right autobrake shuttle valve, or stowing the speed brakes. Go-around protection is provided from throttle actuated switches to deactivate autobrake operation. Refused takeoff (RTO) can be implemented at takeoff when throttles are retarded. This causes autobrake to provide full stopping pressure automatically within the operation of antiskid protection.
C. The autobrake system consists of an autobrake control panel, an autobrake pressure control module, two hydraulic pressure switches, two shuttle valves, and an autobrake electronic circuit card located in the M162 Antiskid Control Unit (E3-2 shelf) (Fig. 1). Additional control inputs are furnished by wheel speed switches, air-ground sensing relay, speedbrake arming switch and engine throttle switches. 28-volt dc power for autobrake operation is supplied through the AUTOBRAKE CONTR circuit breaker on the P6-3 panel. An operational antiskid system is required for automatic braking.
2. Autobrake Control Panel (Fig. 1)_______________________
A. The autobrake control panel, located directly below the antiskid ON-OFF switch on the pilot's forward instrument panel P2-2, consists of an AUTO BRAKE selector switch, and amber AUTO BRAKE DISARM light and two relays, R289 and R290. The relays are located behind the control panel.
(1) The AUTO BRAKE selector switch (S583) is a rotary, six-position switch. The functions provided by the switch are to arm the system by providing 28-volt dc autobrake power to the antiskid control unit, select a 1, 2, 3, MAX or RTO airplane deceleration level, and illuminate the AUTO BRAKE DISARM light.
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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 3(70)
