(l)
Make sure the EICAS message AUTOBRAKES 1 (memo) shows on the top EICAS display.
(m)
Set the AUTOBRAKES selector switch to the 2 position.
(n)
Make sure the EICAS message AUTOBRAKES 2 (memo) shows on the top EICAS display.
(o)
Set the AUTOBRAKES selector switch to the 3 position.
(p)
Make sure the EICAS message AUTOBRAKES 3 (memo) shows on the top EICAS display.
(q)
Set the AUTOBRAKES selector switch to the 4 position.
(r)
Make sure the EICAS message AUTOBRAKES 4 (memo) shows on the top EICAS display.
(s)
Set the AUTOBRAKES selector switch to the MAX AUTO position.
(t)
Make sure the EICAS message AUTOBRAKES MAX (memo) shows on the top EICAS display.
S 735-264
(4)
Do a test of the Brake Metered Pressure Switches, S280 and S281, with the steps that follow:
(a)
Make sure that all three Inertial Reference Systems are aligned (AMM 34-21-00/201).
(b)
If necessary, release the parking brake.
(c)
Make sure that all thrust levers are set to the aft stop.
(d)
Make sure the landing gear control handle is in the DOWN/EXTEND position.
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A 747-400 MAINTENANCE MANUAL
SEE A
SOLENOID VALVE PRESSURE SWITCH
CONNECTOR DM439C
PRESSURE CONTROL SERVO VALVE
SOLENOID VALVE
BRAKE PRESSURE LINE SYSTEM 4 RETURN LINE
SYSTEM 4 PRESSURE LINE
FILTER
CONTROL VALVE PRESSURE SWITCH
A
Autobrake Control Module Figure 503
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(e)
(f)
A
747-400 MAINTENANCE MANUAL
Make sure that the SPEED BRAKE lever is in the DOWN position.
If necessary, do these steps to install a pressure gage at a
brake unit on each side of the airplane:
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.
6) Connect the hose half of the hydraulic brake disconnect to the brake half.
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A
747-400
MAINTENANCE MANUAL
WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 起落架 LANDING GEAR 7(27)
