(3)
There is one test in this task: test of the Brake Fuses.
B. Standard Tools and Equipment
(1)
Container - 2 U.S. gallons capacity
(2)
Locks - Ground
C. Consumable Materials
(1) Hydraulic Fluids, Fire Resistant -BMS 3-11, to replenish system after bleeding
D. References
(1)
12-12-00/201, Hydraulic Reservoir
(2)
24-22-00/201, External Electrical Power
(3)
29-11-00/201, Hydraulic System A
(4)
29-12-00/201, Hydraulic System B.
(5)
32-00-01/201, Ground Locks
E. Bleed the Brake System to the Antiskid Valves
(1)
Make sure that the ground locks of the landing gear are installed in the nose gear (Ref. 32-00-01/201).
(2)
Supply the external electrical power (Ref. 24-22-00/201).
(3)
Pressurize hydraulic systems A and B (Ref. 29-11-00/201 and 29-12-00/201).
(4)
Put the chocks on the wheels and push the brake pedals to release the parking brake.
(5)
Push the brake pedals of the captain or the first officer slowly and fully a minimum of six times to bleed the system.
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F. Bleed the Brake System though the brakes
NOTE: This procedure is recommended after you bleed the system to the antiskid valves if there are signs of air in the brake system. This will be shown by a slow brake response or chattering.
(1)
Pressurize hydraulic systems A and B (Ref. 29-11-00/201 and 29-12-00/201).
(2)
Remove the bleeder screw and washer from the bleeder valve on the brake.
(3)
Connect a flexible hose to the bleeder valve.
(4)
Put the free end of the hose in the clean container not fully filled with the same fluid used in the brake system.
(5)
Remove the lockwire on the bypass lever of the hydraulic fuse for the brake that is bled.
(6)
Move the bypass lever to the open position, hold it open and apply the brakes.
(7)
Apply the brakes while you open and close the bleeder valve on the brakes with an applicable wrench.
(8)
Do this operation until all the air is gone from the flow of fluid.
(9)
Close the bleeder valve while the pressure is kept on.
(10)
Remove the bleed hose, tighten the bleeder valve to 40 pound-inches, and install the bleed screw and the washer.
(11)
Release the bypass lever on the fuse, allow the lever to go back to the closed position and install the lockwire.
(12)
Fill the hydraulic reservoirs (Ref 12-12-00/201).
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Hydraulic Brake Fuse Test
A. General
(1) The hydraulic brake fuse test does a check on the capacity of the fuse to control the fluid leak when a hydraulic line breaks. Do the test for each fuse in the system.
B. Standard Tools and Equipment
(1) Container - 2 U.S. gallons capacity
C. References
(1)
12-12-00/201, Hydraulic Reservoir
(2)
29-11-00/201, Hydraulic System A
(3)
29-12-00/201, Hydraulic System B.
D. Procedure
(1)
Remove the screw from the end of the bleed fitting on the brake and install the bleed hose in the end of the fitting.
(2)
Put a container with a minimum capacity of two U.S. gallons below the brake bleed fitting.
(3)
Pressurize hydraulic systems A and B (Ref 29-11-00/201 and 29-12-00/201).
(4)
Push the brake pedals to the maximum position to apply full brake pressure.
NOTE: The parking brake can be used to keep the brake pedals pushed during the check.
(5)
While full brake pressure is applied, open the brake bleeder valve and let the fluid go into the container until the flow stops.
(6)
Make sure the quantity collected in the container is 20-40 cubic inches or approximately
0.08 to 0.17 gallons.
(7)
Close the bleeder valve and remove the bleed hose.
(8)
Tighten the bleeder valve to 40 pound-inches and install the bleed screw and the washer.
(9)
Remove the lockwire on the bypass lever of the hydraulic fuse you do a test on.
(10)
Move the bypass lever to the open position and hold it open for a minimum of five seconds.
(11)
Release the bypass lever on the fuse, allow the lever to go back to the closed position and install the lockwire.
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