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 A.  Disagreement between the parking brake switch and parking brake valve for more than 3 seconds cause illumination of the ANTISKID INOP light. Failure of the air sensing relay (R278) circuit or the nose gear sensing relay (R321) circuit to show ground mode will be indicated by the ANTISKID INOP light illumination upon application of the parking brake. Application of the parking brake while in the air should normally illuminate the ANTISKID INOP light.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ANTISKID SYSTEM - TROUBLE SHOOTING
__________________________________
 1.  General_______
 A.  Antiskid system trouble symptoms are best identified by performing a test of the antiskid system (Ref Antiskid System - A/T).
 B.  A malfunction of the antiskid system is indicated when the ANTISKID INOP light on the pilot's center panel P2 comes on. Isolation of the malfunction can be accomplished by using the Built-In Test diagnostic capability of the antiskid control unit. By proper interpretation of the LED readout at prescribed switch positions, faults can be isolated to a specific component of the antiskid system.
 C.  Faults indicated during system test which do not result in illumination of the ANTISKID INOP light are generally resolved by replacement of the antiskid control unit (AMM 32-42-21/401).
 2.  Prepare to Trouble Shoot Antiskid System________________________________________
 A.  Check that ground lock assemblies are installed in all landing gears (AMM 32-00-01/201).
 B.  Provide electrical power (AMM 24-22-00/201) and close the following circuit breakers on P6 panel.
 (1)  
Landing gear ANTI-SKID FAIL WARN & PARK BK, INBD ANTISKID, OUTBD ANTISKID

 (2)  
CONTROL CABIN LIGHTING, INDICATOR, MASTER DIM BUS (9 Breakers: BAT, NO. 1 DC, NO. 2 DC, SECT 1, SECT 2, SECT 3, SECT 4, SECT 5, SECT 6)

 (3)  
CONTROL CABIN LIGHTING, PANEL & INSTR, DIM & TEST

 (4)  
Open the following circuit breakers on P6 panel:

 (a)  
AUTOSLAT NO. 1 AC (On airplanes with the Digital Stall Warning 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

 C.  
Check that wheel chocks are in place.

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A 737-300/400/500MAINTENANCE MANUAL
3. Antiskid System Trouble Shooting Chart

NOTE:Switches and LED'S located on front of Antiskid Module M162 in electronics bay E3-2.
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A 737-300/400/500MAINTENANCE MANUAL

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A 737-300/400/500MAINTENANCE MANUAL

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