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____ for this test. You can use the connection between the hubcap and the wheel speed transducer to operate a wheel speed transducer. You can use the A32075-1 equipment to operate a wheel speed transducer.
 To use the hubcap to operate a wheel speed transducer, you must remove the clamp that holds the hubcap to the wheel. You can then disconnect the hubcap from the wheel and turn it freely. When you turn the hubcap, you operate the wheel speed transducer.
 To use the A32075-1 equipment to operate the wheel speed transducer, you must first remove the hubcap. This will give access to the transducer dog. You can then connect the A32075-1 equipment to the transducer dog and operate the wheel speed transducer through this connection.
 1)  Remove the clamp that holds the hubcap to the wheel (Fig. 502).
 2)  Leave the hubcap on the wheel if you will operate the wheel speed transducer with the hubcap.
 3)  Pull the hubcap off the wheel if you will operate the wheel speed transducer with the A32075-1 equipment.
Do these steps to supply pressure to the brakes:
 1)  Make sure that this circuit breaker on the Main Power Distribution Panel, P6, is closed: a) 6L18 PARK BRAKE
 2)  If necessary, release the parking brake.
 3)  Open this circuit breaker on the P6 panel: a) 6L18 PARK BRAKE
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747-400
MAINTENANCE MANUAL

FWD
SEE A
WHEEL
TRANSDUCER DOG
PIN
HUBCAP
CLAMP
A
Transducer Dog Access Figure 502
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747-400 MAINTENANCE MANUAL
 4) Set the parking brake.
 NOTE: Completion of the above steps permits pressurization
____ of the brakes without the shutoff valve of the parking brake module closed. This will let hydraulic fluid move freely through the brake return lines when the brakes are released during the test.
 You can also supply pressure to the brakes manually. To do this, the parking brake must be released and you must push one set of brake pedals fully down. This will supply pressure to the brakes. The brake pedals must be held in this position all through the test to supply pressure to the brakes manually.
 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.
 5) Pressurize hydraulic system No. 4 (AMM 29-11-00/201).
 (d)  At each wheel of the main landing gear, do the steps below to do a test of the antiskid transducer (Refer to Table 501 for wheel numbers).
 NOTE: 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, tests 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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