(10) Make sure that the EICAS message BRAKE SOURCE (CAUTION) shows on the top EICAS display.
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747-400 MAINTENANCE MANUAL
S 735-254
(11)
Make sure that the BRAKE SOURCE light on the Captain's Main Instrument Panel, P1, is on.
S 735-285
(12)
Push the <BRAKE SYSTEM BITE LSK.
S 735-287
(13)
Ignore the instructions of the TEST PRECONDITIONS screen and push the START TEST> LSK.
NOTE: The CDU will show test configuration error indications next.
____
S 735-288
(14) Make sure that the CDU shows the configuration error indication NO ACTIVE BRAKE SOURCE ACCUMULATOR ACTIVE
NOTE: Push the CONTINUE> LSK until you find the configuration error
____
indication specified above.
S 735-255
(15)
Push the <RETURN LSK until the GROUND TESTS menu shows.
S 735-256
(16)
Pressurize hydraulic system No. 4 (AMM 29-11-00/201).
S 735-257
(17)
Make sure that the EICAS message BRAKE SOURCE (CAUTION) does not show on the top EICAS display.
(18)
Make sure that the BRAKE SOURCE light, on the P1 panel, is not on.
S 735-258
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747-400 MAINTENANCE MANUAL
J. Do this Test of the Antiskid System
S 735-259
(1)
Do the Brake Release Test (Ref Ground Tests - Brake Control System)
S 735-252
(2)
Do these steps to do a test of locked wheel protection:
(a)
If necessary, do these steps to install a pressure gage at each brake unit of the main landing gear (16 locations): 1) Make sure that the parking brake is released. 2) Make sure that the brakes are not operated manually.
WARNING: THE BRAKES MUST NOT BE IN OPERATION WHEN YOU CONNECT
_______ OR DISCONNECT THE TWO PARTS OF A HYDRAULIC BRAKE DISCONNECT. IF YOU TRY TO CONNECT OR DISCONNECT A HYDRAULIC BRAKE DISCONNECT WITH THE BRAKE IN OPERATION, HYDRAULIC FLUID UNDER HIGH PRESSURE CAN RELEASE. THIS CAN CAUSE INJURY TO PERSONNEL AND DAMAGE TO EQUIPMENT.
3) To remove all pressure from the brake unit, disconnect the hose half of the hydraulic brake disconnect from the brake half.
4) Remove the brake bleeder assembly from the brake unit housing.
NOTE: Each brake bleeder assembly has a bleeder valve
____ installed in an adapter. The adapter is installed in the brake unit housing.
CAUTION: BE CAREFUL DURING INSTALLATION OF THE PRESSURE GAGE
_______ IN THE PORT ON THE BRAKE UNIT HOUSING. DO NOT INSTALL THE PRESSURE GAGE WITH MORE THAN 110 POUND-INCHES OF TORQUE. IF YOU USE TOO MUCH TORQUE DURING INSTALLATION OF A PRESSURE GAGE, YOU CAN DAMAGE THE BRAKE UNIT HOUSING.
5) Install a pressure gage in the port on the brake unit housing.
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(b)
(c)
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747-400 MAINTENANCE MANUAL
6) Connect the hose half of the hydraulic brake disconnect to the brake half.
Do these steps to prepare for operation of the wheel speed
transducers:
NOTE: There are two ways to operate a wheel speed transducer
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