757 AMM 飞机维护手册 起落架 CHAPTER 32 - LANDING GEAR 2(135)

 (b)  
Place a container with a minimum capacity of 3 U.S. gallons near the brake bleed fitting so that fluid can flow directly into the container.

 (c)  
Depressurize right hydraulic system and reservoir and
 pressurize left hydraulic system and reservoir
 (AMM 29-11-00/201).

 (d)  
Push the brake pedals all the way in and hold.

 NOTE: The parking brake may be used to hold the brake pedals
____
 fully pushed in for fuse checks.

 (e)  While you apply full brake pressure, open the bleeder valve one-half turn. Allow the fluid to flow into the container until the flow stops. This shows that the fuse has closed.
 NOTE: Fluid can flow out of the hose very quickly and
____ intermittently. Be sure that the flow goes into the container.
 (f)  
Check that the quantity collected does not exceed 1.5 gallons total from each of the four axle set of brakes.

 (g)  
Reset the fuse. Hold the fuse knob in bypass position for 5 seconds minimum to make sure that the fuse resets.

 (h)  
Remove the bleed hose and install the screw and washer in end of the bleeder valve.

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 (i)  Do the above test again for each fuse.
 NOTE: The hydraulic reservoir quantity should be monitored
____ closely. The alternate brake system test series will use approximately 1.4 gallons of hydraulic fluid.
 In the alternate brake system, one fuse is shared by two side by side brakes on an axle, therefore bleeding at only four bleed plug locations is required.
 S 612-020
 (5)  
Do the servicing procedure for the left hydraulic system reservoir (AMM 12-12-01/301).

 H.
Put the airplane back to its usual condition.

 S 432-021
 (1)  
Tighten the bleeder valve as follows:

 (a)  
Tighten the bleeder valve on the B.F. Goodrich brakes to 35-55 pound-inches.

 (b)  
Tighten the bleeder valve on the Dunlop brakes to 8 pound-feet.

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 HYDRAULIC BRAKE SYSTEM - ADJUSTMENT/TEST
________________________________________
 1.  General_______
 A.  This subject contains six tasks. The first task prepares the brake system for the operational tests. The second, third, and fourth tasks are operational tests of the brake system. The fifth task is a system adjustment. The sixth task is a system test.
 (1)  
The operational tests make sure that the hydraulic brake system operates properly. You can do these tests in a minimum of time with only the equipment installed in the airplane. Do not use these tests when you should do a system test or to do a check for correct system adjustments.

 (2)  
The system adjustment gives all the adjustments that are necessary to make sure that the system will operate properly.

 (3)  
The system test is a more detailed test than the operational tests and will make sure that the system and its components operate correctly and the system adjustments are correect.

 TASK 32-41-00-845-086
 2.  Prepare for the Operational Tests of the Hydraulic Brake System (Fig. 501)_______________________________________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

 (2)  
AMM 29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems

 (3)  
AMM 32-00-15/201, Landing Gear Door Locks

 (4)  
AMM 32-00-20/201, Landing Gear Downlocks

 (5)  
AMM 32-41-00/201, Hydraulic Brake System

 B.  
Access

 (1)  
Location Zones
 211 Control Cabin, Left
 212 Control Cabin, Right
 731 Landing Gear Left
 741 Landing Gear Right

 C.  
Procedure

 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-002

 (2)  
Make sure that this circuit breaker on the main power distribution panel, P6, is closed:

 (a)  
6F4, LANDING GEAR PARKING BRAKE VLV

 S 865-001
 

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