ANTISKID CONTROL SHIELD - REMOVAL/INSTALLATION
1. General
A. To remove the antiskid control shield, make sure all antiskid circuit breakers are opened. Release latch and remove unit from rack. When installing antiskid control shield, make sure pins are straight in component and rack connectors and secure latch.
B. When the antiskid control shield is replaced, perform the antiskid system test as follows:
(1)
Prepare for Test
(a)
Ensure gear ground lock assembly is installed in nose gear (Ref 32-00-01).
(b)
Pressurize hydraulic systems A and B (Ref 29-11-0 and 29-12-0, Maintenance Practices).
(c)
Provide electrical power to antiskid system.
(d)
Close all landing gear circuit breakers on P6 panel.
(e)
Ensure wheel chocks are in place.
(2)
Test Antiskid Control Shield
(a)
Release parking brake.
(b)
Set inboard and outboard antiskid switches on pilot's panel to OFF position. Ensure ANTISKID INOP lights are on.
(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: 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: 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.
(g)
Push inboard antiskid circuit breaker in. Ensure inboard ANTISKID INOP light goes off.
(h)
Pull outboard antiskid circuit breaker. Ensure outboard ANTISKID INOP light comes on.
(i)
Push outboard antiskid circuit breaker in. Ensure outboard ANTISKID INOP light goes off.
(j)
Check press-to-test circuit of the four lights on the antiskid control shield located in the electrical/electronic equipment compartment.
(k)
Set parking brake.
(l)
Place SYSTEM TEST switch on antiskid control shield in LEFT position. Check that RO and RI lights are on and LO and LI lights are off.
NOTE: Upon releasing switch, all lights will go off.
(m)
Place SYSTEM TEST switch in RIGHT position. Check that LO and LI lights are on and RO and RI lights are off.
NOTE: Upon releasing switch, all lights will go off.
(n)
Release parking brake.
(o)
Depress and hold brake pedals. Check that all brakes are applied.
(p)
Hold SYSTEM TEST switch in LEFT or RIGHT position while performing step (q).
(q)
Press AIR SENSING TEST switch on landing gear electrical module. Check that LI and RI lights on antiskid control shield come on. Check that left inboard and right inboard brake stacks release and left outboard and right outboard brake stacks remain applied.
(r)
Release AIR SENSING TEST switch and SYSTEM TEST switch. Check that all brakes are applied.
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May 15/80 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-42-21 Page 401
(s) Test outboard touchdown protection function. 1) Connect antiskid/auto brake tester F80129-100 to antiskid control shield test connector. 2) Simulate a 65-knot wheel speed on left inboard and right inboard wheels with tester. Check that left outboard and right outboard brake stacks release and left inboard and right inboard brake stacks remain applied. 3) Remove left inboard wheel speed simulation. Check that left inboard brakes release and left and right outboard brake stacks apply. 4) Remove right inboard wheel speed simulation and reapply left inboard wheel speed simulation. Check that right inboard brakes release and left inboard brakes apply.
5) Remove left inboard wheel speed simulation and remove tester.
(t)
Release brake pedals. Check that all brakes release.
(u)
Perform Autobrake System Test (Ref 32-43-01, A/T).
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32-42-21 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/86
ANTISKID VALVE - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Deleted
B. Gear Ground Lock Assembly (Ref 32-00-01)
2. Remove Antiskid Valve
A. Ensure gear ground lock assembly (Ref 32-00-01) is installed in nose gear.
B. Open OUTBD ANTISKID, INBD ANTISKID, ANTISKID FAIL WARN & PARKING BRAKE and ANTISKID TEST circuit breakers on P6 load control panel.
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