S 862-044
(5)
Release the parking brake.
E.
Bleed the Brake Lines (Fig. 201)
S 842-034
(1)
Do these steps to prepare the bleed port:
(a)
Remove the screw and washer from the end of the bleeder valve.
(b)
Install a hose on the end of the bleeder valve.
(c)
Put a container below the brake bleeder port and make sure the fluid can go from the hose into the container.
S 862-035
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 CUASE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(2)
Pressurize hydraulic system No. 4 (AMM/29-11-00/201).
S 872-036
(3)
Do these steps to bleed the brakes (normal system):
(a)
Slowly push the captain's brake pedals to approximately one-half the distance to the stops and then slowly release the brake pedals. 1) Do this six times to cause a separation of the air from the
fluid in the lines.
(b)
Push the brake pedals to the stops and then release them. 1) Do this six times.
WARNING: DO NOT OPERATE THE BRAKE PEDALS WHEN THE BLEED PORT IS
_______ OPEN. HYDRAULIC FLUID THAT COMES OUT AT A HIGH PRESSURE CAN CAUSE INJURIES.
(c)
Put goggles on for eye protection.
(d)
Make sure that the parking brake is released and the brake pedals are released.
(e)
Open the bleeder valve slowly about one-half of a turn until the fluid begins to flow from the hose.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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A
747-400
MAINTENANCE MANUAL
BLEED PORT LOCATION
SEE A
BLEEDER VALVE
ADAPTER SCREW WASHER
BRAKE PISTON HOUSING
1
2
1 AIRPLANES WITH THE DETENT PIN RELEASE TYPE
BRAKE QUICK-DISCONNECT COUPLING BLEED PORT LOCATION
2 BRAKE QUICK-DISCONNECT COUPLING AIRPLANES WITH THE THREADED TYPE A
Hydraulic Brake Bleed Port Location
Figure 201
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
CAUTION:_______ TIGHTEN THE BRAKE BLEEDER VALVE TO 45 POUND-INCHES MAXIMUM
TO INSTALL OR CLOSE THE VALVE. IF YOU TIGHTEN THE VALVE
TO MORE THAN 45 POUND-INCHES, YOU WILL DAMAGE THE BRAKE
BLEEDER ADAPTER AND CAUSE THE BRAKE TO HAVE A LEAK.
(f) Close the bleeder valve.
S 612-037
(4)
Add hydraulic fluid if it is necessary to fill hydraulic system No. 4 (AMM/12-12-01/301).
S 862-038
(5)
Remove the power from hydraulic system No. 4 (AMM/29-11-00/201).
S 862-039
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.
(6)
Pressurize hydraulic system No. 1 (AMM 29-11-00/201).
S 872-040
(7)
Do these steps to bleed the brakes (alternate system):
(a)
Do the eight steps below the "Do these steps to bleed the brakes (normal system)" step.
(b)
Install a lockwire to safety the adapter of the brake bleeder assembly to the brake unit housing.
S 612-041
(8) Add hydraulic fluid if it is necessary in the servicing steps for hydraulic system No. 1 (AMM 12-12-01/301).
S 862-042
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
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