F.
Put the Airplane Back to Its Usual Condition
S 842-130
(1)
At the applicable brake unit(s), do these steps to remove the pressure gage and install a brake bleeder assembly:
(a)
Make sure that the parking brake is released.
(b)
Make sure that the brakes are not operated manually.
WARNING: DO NOT OPERATE THE BRAKES 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, A HIGH PRESSURE RELEASE OF HYDRAULIC FLUID CAN OCCUR. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(c)
To remove all pressure from the brake unit, disconnect the hose half of the hydraulic brake disconnect from the brake half.
(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.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
CAUTION:_______ TIGHTEN THE ADAPTER TO 90-110 POUND-INCHES. IF YOU TIGHTEN THE ADAPTER TO MORE THAN 110 POUND-INCHES, YOU CAN CAUSE DAMAGE TO THE ADAPTER OR THE BRAKE UNIT HOUSING.
1) Tighten the adapter to 90-110 pound-inches.
NOTE:____ The specified torque values are for the installation of the adapter on the brake unit housing. The maximum torque value for the bleeder valve, which you do not operate in this procedure, is 45 pound-inches.
2) Install a lockwire to safety the adapter of the brake bleeder assembly to the brake unit housing.
(2) S 862-156Pressurize hydraulic system No. 4 (AMM 29-11-00/201).
(3) S 842-132Do this sequence of steps six times to bleed remaining 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. (d) Stop for ten seconds before you operate the brakes again.
(4) S 612-133Do a check of the fluid level in the reservoir of hydraulic system No. 4. (a) Fill up the reservoir to the correct level if the fluid level is too low (AMM 12-12-01/301).
(5) S 842-135Set the parking brake.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(6) S 842-134At the applicable brake unit(s), do these steps to do a check of the brake bleeder assembly: (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.
(7) S 862-157Remove power from hydraulic system No. 4 (AMM 29-11-00/201).
(8) S 842-137Set the GND TESTS switch on the Overhead Maintenance Panel, P461, or in the main equipment center to the NORM position.
(9) S 842-138From the GROUND TESTS menu, push the <RETURN LSK return to the CMC MENU.
S 092-139
(10)
Do this task: "Removal of the Door Locks from the Wing Landing Gear" (AMM 32-00-30/201).
S 092-140
(11)
Do this task: "Removal of the Door Locks from the Body Landing Gear" (AMM 32-00-30/201).
S 862-158
(12)
Remove the electrical power, if it is not necessary (AMM 24-22-00/201).
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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(88)
