(1)
Open the following circuit breakers on P6 panel:
(a)
AUTOSLAT NO. 1 AC (On airplanes with the Digital Stall Warning and the Autoslat Computers)
(b)
AUTOSLAT NO. 1 DC
(c)
AUTOSLAT NO. 2 AC (On airplanes with the Digital Stall Warning and the Autoslat Computers)
(d)
AUTOSLAT NO. 2 DC
(2)
Perform a system turn-on self-check (TOSC) for landing (airplane in air) as follows:
(a)
Depress the AIR SENSE test switch on the E-11 shelf in the radar bay, and place the AUTO BRAKE selector switch on autobrake control panel to position 1.
(b)
Verify that AUTO BRAKE DISARM light remains extinguished.
(c)
Return AUTO BRAKE selector switch to OFF position.
(d)
Release AIR SENSE test switch on E-11 shelf.
(3)
Depress and hold the ABS switch on the front of the antiskid module while performing the following steps:
NOTE: If any of the below steps are not accomplished within the
____ specified time limit, the system will disarm and the test must be restarted with this step.
(a)
Place the AUTO BRAKE selector switch to position 1.
(b)
Within 15 seconds of the above step, place the automatic speed brake handle to the ARMED position.
(c)
Within 15 seconds of the above step, place the automatic speed brake handle to DOWN (stowed) position.
(d)
Within 15 seconds of the above step, advance both throttles.
(e)
Within 15 seconds of the above step, retard both throttles.
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737-300/400/500MAINTENANCE MANUAL
(f) After a delay of 57 seconds from step (e), verify that the AUTO
BRAKE light on antiskid module and the AUTO BRAKE DISARM light
on P2-2 panel are both flashing.
NOTE: The ABS light and the AUTO BRAKE DISARM light are____
connected together in parallel. Successful test of
system is indicated by both lights flashing.
(4) Release the ABS TEST switch. After 5 seconds, lightly depress the
right brake pedal. Verify that AUTOBRAKE DISARM light illuminates
steadily.
(5) Place AUTO BRAKE selector switch to OFF position.
(6) Press and hold AIR SENSE test switch on E-11 shelf in radar bay and
turn AUTO BRAKE selector switch to position 1.
(a) Hold AIR SENSE test switch for five seconds and check that
AUTO BRAKE DISARM light remains off.
(b) Release AIR SENSE test switch.
(7) Remove antiskid control unit from E3-2 shelf when checking antiskid
module connector pins. If the remedy as described in chart does not
solve the problem, the antiskid unit may be considered defective.
Replace antiskid control unit (AMM 32-42-21, R/I) as required.
ú (8) After trouble shooting is completed, close all circuit breakers that
ú were opened in this procedure.
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737-300/400/500MAINTENANCE MANUAL
2. _______________________________________________Automatic Braking System Trouble Shooting Chart
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
AUTOBRAKE DISARM light illuminated steadily (not flashing) in Time required for system to disarm from step 1.B.(3) 1.B.(3)(e) DISARM light illuminates in AUTO BRAKE 1.B.(2) S583 autobrake control switch defective Air sensing defective Failure in anti-skid system Solenoid valve pressure switch defective Servo valve pressure switch defective Electrical power not available for autobrake operation relay R278 1,2,3,Max, and RTO and check at pins 45,39,49,61, and 40 of D1040 respective-switch on E11 shelf and Depress AIR SENSE test Turn AUTO BRAKE selector to ly for 28V dc. If less than 22V dc at each pin: Check that AUTOBRAKE CONTR circuit breaker on P6-3 skid module connector Observe that ANTISKID INOP ance less than 4 ohms) is at pin 9 of D1040 antiskid Check that ground is at pin 51 of D1040 antiskid module Check that ground is at pin 54 of D1040 antiskid module is at pin 47 of D1040 anti-check that ground (resist-panel is closed and 28V dc light on P2-2 panel. If light comes on: module connector. Release AIR SENSE test switch and check for open circuit (greater than 50,000 ohms) between pin 9 and ground. If check fails: connector. If check fails: connector. If check fails: Replace S583 Ensure AUTOBRAKE CONTR circuit breaker is closed is available Trouble shoot antiskid system Replace solenoid valve pressure switch (Ref Replace servo valve pressure switch (Ref Replace relay R278 (Ref 32-42-00TS) 32-43-46 MP) 32-43-46 MP) and 28V dc power
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