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 - Adjustment/Test).
B.  If the test lights do not react as specified in the system test, proceed to isolate the cause by means of the following chart.
C.  A malfunction of the antiskid system is indicated when an ANTISKID INOP light on the pilot's center panel P2 comes on. Isolation of the malfunction can be accomplished by using the failure isolation circuit of the antiskid control shield. The four lights and two switches on the front of the control shield are used for fault isolation, and by proper interpretation of light behavior when the COMPONENT TEST switch is operated, the fault can be isolated to a specific transducer, antiskid valve, or the control shield. If both ANTISKID INOP lights are on and the failure cannot be isolated to antiskid valves or transducers with the use of the COMPONENT TEST switch, the failure is in parking brake circuit (Ref 32-41-0 and 32-44-0).
2.  Antiskid System Trouble Shooting Chart
501 
Feb 1/74  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-42-0 Page 101 

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32-42-0 Page 102  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/87 

ANTISKID SYSTEM - ADJUSTMENT/TEST
1.  Antiskid System Test
A.  General
(1)  
Ground test features are built into the antiskid control unit. Two test switches and four indicator lights are accessible for a quick confidence examination of each channel of the system. This test is designed to first test the indication/monitor function and then test the individual components of the antiskid system: antiskid control shield, antiskid control valves, wheel speed transducers, and switches. If it is desired to test the complete antiskid system, perform the entire test in sequence.

(2)  
After replacement of the antiskid control shield, perform the antiskid indication/monitor test and the antiskid control shield test.

(3)  
After replacement of an antiskid control valve, perform the antiskid indication/monitor test and the antiskid control valve test.

(4)  
After replacement of a wheel speed transducer, perform the antiskid indication/monitor test and the wheel speed transducer test.

(5)  
After replacement of a switch, perform the individual switch test.

(6)  
If the indications obtained are not as specified, refer to Antiskid System - Trouble Shooting and Inspection/Check.

B.  Equipment and Materials
(1)  
Antiskid/Auto Brake Tester - F80129-1 or -100

(2)  
DC voltmeter - 0- to 15-volt range

(3)  
Axle jacks

(4)  
Gear Ground Lock Assembly (Ref 32-00-01)

591 
Feb 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-42-0 Page 501 

Antiskid System Controls  591 
32-42-0  Figure 501  Feb 20/85 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

C.  Prepare for Test
(1)  
Ensure ground lock assemblies are installed in all gear (Ref 32-00-01).

(2)  
Pressurize hydraulic systems A and B (Ref 29-11-0 and 29-12-0 MP).

(3)  
Provide electrical power to antiskid system.

(4)  
Close all landing gear circuit breakers on P6 panel.

(5)  
Open ground interconnect valve circuit breaker on P6 panel.

(6)  
Ensure wheel chocks are in place.

D.  Test Antiskid System
(1)  
Test Antiskid Indication/Monitor Function

(a)  
Release parking brake.

(b)  
Set inboard and outboard antiskid switches on pilot's panel to OFF position. Ensure ANTISKID INOP lights are on (Fig. 501).

(c)  
Set both inboard and outboard antiskid switches to ON position. Ensure ANTISKID INOP lights go off.

(d)  
Set parking brake. Ensure ANTISKID INOP lights remain off.

NOTE:  The ANTISKID INOP lights may come on momentarily when parking brake valve opens or closes.

(e)  
Release parking brake. Ensure ANTISKID INOP lights remain off.

NOTE:  The ANTISKID INOP lights may come on momentarily when parking brake valve opens or closes.

(f)  
Pull inboard antiskid circuit breaker. Ensure inboard ANTISKID INOP light comes on.
　
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