BL 0
VIEW LOOKING AFT
WHEEL WELL COMPONENTS
Automatic Braking System Component Locations
Figure 1 (Sheet 1)
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A
737-300/400/500MAINTENANCE MANUAL
CIRCUIT BREAKER C583 AUTOBRAKE ANTISKID CONTROLM1639 (ENGINE 1) AND
CONTROL (P6-3)
UNIT M162 (E3-2)
GEAR AIR SENSING
RELAY R278 (E11)
BL 0
VIEW LOOKING AFT
WHEEL WELL COMPONENTS
Automatic Braking System Component Locations
Figure 1 (Sheet 2)
G37632
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
CENTER PANEL CONTROL MODULE
Automatic Braking System Component Locations
Figure 1 (Sheet 3)
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G37638
BRAKE PEDAL PRESSURE
PRESSURE FROM AUTOBRAKE
TO BRAKE
AFT BULKHEAD, WHEEL WELL
FILTER
SUPPLY PRESSURE PORT
A
737-300/400/500
MAINTENANCE MANUAL
BRAKE PEDAL
PRESSURE SWITCHES
AUTOBRAKE
SHUTTLE VALVE
TO BRAKES
AUTOBRAKE
SHUTTLE VALVE
C
BRAKE PRESSURE PORT
SERVO VALVE
PRESSURE SWITCH
SOLENOID VALVE PRESSURE SWITCH
PRESSURE CONTROL SERVO VALVE
RETURN PORT
SOLENOID VALVE
D
Automatic Braking System Component Locations Figure 1 (Sheet 4)
G37650
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A
737-300/400/500MAINTENANCE MANUAL
(2)
The AUTO BRAKE DISARM indicator light also illuminates when the automatic braking system is turned on to the RTO position. The light will remain on until a turn-on self-check (TOSC) initiated by the system is successfully completed in about one second. The AUTO BRAKE DISARM light also illuminates for both failure detection (including power loss) and crew-initiated disarming. The light can be extinguished by placing the AUTO BRAKE selector switch to OFF. However, AUTO BRAKE DISARM if light illumination is caused by autobrake solenoid valve failure, the light will remain on in all switch positions.
(3)
The (A/B DISARM) relay R290 provides switching functions for disarming the system when the arming requirements for landing or RTO operations are not fully met. The relay will reset when the AUTO BRAKE selector switch is placed to OFF.
(4)
The (A/B ON) relay R289 provides switching functions for supplying 28-volt dc autobrake-on power to the antiskid control unit and to the solenoid shutoff valve in the autobrake pressure control module (V122). Relay 289 energizes when at least one wheel speed on each main gear is greater than 60 knots.
3. Autobrake Pressure Control Module (Fig. 1)_________________________________
A. The autobrake pressure control module is connected to system B hydraulic lines, and is located on the center ceiling of the main gear wheel well just forward of bulkhead station 727. The module consists of an electrohydraulic pressure control servo valve, a solenoid operated shutoff valve, two hydraulic pressure actuated switches (one at the output of the solenoid shutoff valve and the other at the output of the pressure control servo valve), and an inlet pressure fluid filter (Fig. 2). The module supplies autobrake pressure to all four main wheel brakes through the autobrake shuttle valves.
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