(d)
Remove the pressure gage from the brake unit housing.
(e)
Do these steps to install a brake bleeder assembly on 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.
1) Apply a thin layer of hydraulic fliud to the O-rings.
2) Install the O-rings.
CAUTION: TIGHTEN THE ADAPTER TO 90-110 POUND-INCHES.
_______ IF YOU TIGHTEN THE ADAPTER TO MORE THAN 110 POUND-INCHES, YOU CAN DAMAGE THE ADAPTER OR THE BRAKE UNIT HOUSING.
3) Tighten the adapter to 90-110 pound-inches.
NOTE: The specified torque values are for installation of
____ the adapter in the brake unit housing. The maximum torque value for the bleeder valve, which you do not operate in this procedure, is 45 pound-inches.
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4) Lockwire the adapter of the brake bleeder assembly to the brake unit housing.
(f) Connect the hose half of the hydraulic brake disconnect to the brake half.
S 845-235
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 EQUIPMEMNT.
(3)
Pressurize hydraulic system No. 4 (AMM 29-11-00/201).
S 875-339
(4)
Do these steps six times to bleed any small quantities of air from the brakes:
(a)
Slowly push one of the two sets of brake pedals to the limit of travel to fully operate the brakes.
(b)
Hold these brake pedals in this position momentarily.
(c)
Slowly release the brake pedals. Stop for ten seconds before you operate the brakes again.
S 845-340
(5)
Set the parking brake.
S 795-341
(6)
Do a check of the brake bleeder assembly installed on each brake unit housing as follows (2 locations):
(a)
After two minutes with the parking brake set, make sure that there is no leakage at the brake bleeder assembly.
(b)
Make sure that a machine screw is installed in the bleeder valve of the brake bleeder assembly.
S 845-342
(7)
Remove the power from hydraulic system No. 4 (AMM 29-11-00/201).
S 845-343
(8)
Set the GND TESTS switch, on the P461 panel or in the main equipment center, to the NORM position.
S 845-345
(9)
Push the LSK that is adjacent to <RETURN until the GROUND TESTS menu shows.
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S 845-416
(10)
Make sure that DONE shows adjacent to <A/BRK APPLICATION.
S 845-346
(11)
From the GROUND TESTS menu, push the LSK that is adjacent to <RETURN to return to the CMC MENU.
S 845-347
(12)
Remove the electrical power, if it is not necessary
(AMM 24-22-00/201).
TASK 32-42-00-715-348
6. Ground Test - Torque Zero Function
__________________________________
A. General
(1) The EICAS maintenance page for the landing gear shows a value for brake torque at each wheel location. With the airplane stopped, the parking brake off, and the brakes not operated, this EICAS maintenance page shows offset torque values.
NOTE: The EICAS maintenance page for the landing gear shows
____ brake torque values in thousands of pound-feet. For example, a brake torque value of 1.5 is equal to 1500 pound-feet.
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本文链接地址：747-400 AMM 飞机维护手册 起落架 LANDING GEAR 7(17)
