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A 737-300/400/500MAINTENANCE MANUAL
CONDITIONS FOR AUTOBRAKE DISARM - RTO DISARM LIGHT ILLUMINATED INDICATED BY
2. 1. 3. 4. AVERAGE WHEEL VELOCITY < 60 KNOTS EITHER BRAKE PEDAL DEPRESSED (PRESSURE > 750 PSI) FOR 0.30 SECONDS WHEN SOLENOID VALVE PRESSURE SWITCH INDICATES PRESSURE < 1000 PSI FOR MORE THAN 1 SECOND INBOARD OR OUTBOARD ANTISKID FAILS A. AUTOBRAKE SELECTOR SWITCH TURNED TO OFF AUTOMATIC SPEED BRAKE HANDLE RAISED THEN STOWED A. B. A. B. C. D. AUTOBRAKE SELECTOR SWITCH TURNED TO OFF A. B. C. AUTOBRAKE SYSTEM POWER FAILS AUTOBRAKE SYSTEM POWER FAILS EITHER THROTTLE ADVANCED INBOARD OR OUTBOARD ANTISKID SYSTEM SWITCH TURNED TO OFF RTO NOT ARMED, AIRPLANE ON GROUND WITH BOTH THROTTLES IN RETARDED POSITION, RTO ARMED, AIRPLANE ON GROUND WITH BOTH THROTTLES IN RETARDED POSITION, AND AUTOBRAKE "ON" INPUT (IN ANTISKID MODULE) RECEIVES NO POWER AUTOBRAKE SELECTOR SWITCH TURNED TO 1,2,3 OR MAX AUTOBRAKE SELECTOR SWITCH TURNED TO 1,2,3 OR MAX EITHER BRAKE PEDAL HELD DEPRESSED (BRAKE METERING VALVE PRESSURE > 750 PSI) B. C. D. ANTISKID SYSTEM SWITCH TURNED TO OFF BOTH THROTTLES RETARDED WITH AVERAGE WHEEL SPEED > 60 KNOTS BUT < 88-90 KNOTS SERVO VALVE PRESSURE SWITCH INDICATES PRESSURE > 1000 PSI SOLENOID VALVE PRESSURE SWITCH INDICATES PRESSURE > 1000 PSI C. D. INBOARD OR OUTBOARD ANTISKID FAILS AUTOBRAKE CIRCUIT FAILURE DETECTED E. F. G. AND ANY WHEEL SPEED IS > 60 KNOTS RTO ARMED, AIRPLANE ON GROUND WITH BOTH THROTTLES RETARDED BUT AVERAGE WHEEL H. RTO ARMED, AIRPLANE ON GROUND WITH BOTH THRUST LEVERS RETARDED AND ONE THRUSTI. J. SWITCH FAILED TO ADVANCED POSITION BOTH THROTTLES RETARDED WITH AIR/GROUND INPUT FAILED TO AIR MODE E. F. G. SPEED < 88 KNOTS AUTOBRAKE DISARM - FAILURE INITIATED IN ACTIVATION (AUTOBRAKING) MODE_____________________________________________________________________ FOR MORE THAN 2 SECONDS WHEN AVERAGE WHEEL VELOCITY IS GREATER THAN 60 KNOTS AUTOBRAKE DISARM - PILOT INITIATED IN ACTIVATION (AUTOBRAKING) MODE___________________________________________________________________ AUTOBRAKE DISARM - PILOT INITIATED IN WAITING MODE__________________________________________________ AUTOBRAKE DISARM - FAILURE INITIATED IN WAITING MODE____________________________________________________
Autobrake Disarm
Figure 4 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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A 737-300/400/500MAINTENANCE MANUAL
Autobrake On-Ramp (Landing Mode)
Figure 5
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G65764
A
737-300/400/500MAINTENANCE MANUAL
AUTOMATIC BRAKING SYSTEM - TROUBLE SHOOTING
___________________________________________
1. General
_______
A. In trouble shooting the automatic braking system, trouble symptoms are best identified by performing an operation test of the system (Ref Automatic Braking System - A/T). Conditions required for system operation are:
(1)
Autobrake electrical power is available.
(2)
Antiskid system is operable with no faults.
(3)
Hydraulic system B is pressurized (AMM 29-15-00, MP).
(4)
Both engine throttles are retarded.
(5)
Left and right brake pedal pressure is less than 750 psi (feet off the brakes).
B.
If any one of the above conditions is not met, the system will disarm. A malfunction of the system is indicated by the illumination of the AUTO BRAKE DISARM light in longer than 1.5 seconds. Isolation of the malfunction can be accomplished by using the system self-test features and the TEST switch on the front face of the antiskid module. System fault can be isolated to a specific component by proper interpretation of light behavior as described in chart.
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