(a)
P180 DC Power Distribution Panel
1) 180J7, ANTI-SKID 1-3
2) 180J8, ANTI-SKID 14-16
3) 180F7, ANTI-SKID 2-4
4) 180F8, ANTI-SKID 13-15
5) 180J22, ANTI-SKID 5-7
6) 180J23, ANTI-SKID 10-12
7) 180F22, ANTI-SKID 6-8
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ALL ú ú 03 Page 409 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
8) 180F23, ANTI-SKID 9-11
S 724-023
(3)
Do the Brake System BITE Test procedure in the "Ground Tests - Brake Control System" task (AMM 32-42-00/501).
S 724-018
(4)
Do these steps to do a test on the antiskid transducer:
WARNING:_______THIS TEST OPERATES THE BRAKES. MAKE SURE THAT THE AREA AROUND EACH BRAKE IS CLEAR AND THAT THERE ARE CHOCKS UNDER THE WHEELS. THIS WILL PREVENT INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(a)
Put chocks under the wheels.
(b)
Release the parking brake.
(c)
Open this circuit breaker and install a DO-NOT-CLOSE tag:
1) P6 Main Power Distribution Panel
a) 6L18, PARK BRAKE
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL
_______ CONTROL SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(d)
Supply hydraulic pressure to hydraulic system No. 4
(AMM 29-11-00/201).
(e)
Set the parking brake.
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32-42-04
ALL ú ú 03 Page 410 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(f)
(g)
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747-400 MAINTENANCE MANUAL
Turn the antiskid transducer shaft at approximately 600 RPM and do these checks:
NOTE: Use the Spinup Equipment Tool if it is available.
____ When you perform the transducer spin test, both the locked wheel protection and skid protection functions are tested. Locked wheel protection continously compares the fore/aft (tandem) wheel speeds. A difference in wheel speeds of 30% will cause the brake pressure of the slower wheel to be released. For example, while you spin the transducer for wheel #1, the brake pressure for wheel #3 should release (the slower/stopped tandem wheel). The second part of the transducer spin test, stopping the spinning transducer quickly, testst the skid protection function. when the transduceris stopped quickly, the antiskid card senses this as a skid of the wheel and release that brake. For example, when the spinning transducer for wheel #1 is stopped quickly, the brake pressure for wheel #1 should release.
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