737-300 400 500 AMM 飞机维护手册 起落架 LANDING GEAR 3(24)

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 fully filled with the same type of fluid used to bleed the brake.
 CAUTION: MAKE SURE TO KEEP YOUR FINGERS AWAY FROM THE PARTS OF
_______ THE BRAKE THAT MOVE DURING THE BLEED OPERATION. INJURIES TO PERSONS CAN OCCUR.
 4)  Apply a fluid pressure of approximately 250 psi to the
 brake until the pistons are fully extended. 5) Stop the supply of the fluid pressure from the pump. 6) Open the bleed valve and allow the pistons to retract
 fully. 7) Monitor the quantity of air in the fluid that is in the
 receptacle. 8) Close the bleed valve. 9) Do the bleed procedure again until all the air in the fluid
 is gone. 10) Remove the bleed hose and install the bleed screw and the
 washer in the bleed valve. 11) Tighten the bleed valve screw to 40 +/- 10 pound-inches. 12) Safety the bleed valve screw with lockwire.
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A 737-300/400/500MAINTENANCE MANUAL
 S 434-025
 (2)  If it is necessary to replace the brake mounting gasket,
 do the steps that follow:

 NOTE: For airplanes that have the phenolic gasket configuration,
____ it is recommended that the metallic gasket configuration be installed per SB 32-1253
 (a)  For airplanes with a phenolic gasket, put the gasket through the studs against the brake flange.
 NOTE: You can use BAC 5010 (Type 94) adhesive to hold
____ the gasket to the brake flange. Apply the adhesive to 3 to 5 locations between the holes.
 (b)  For airplanes with a metal gasket, replace the gasket as follows: 1) Put the gasket against the brake flange. 2) Install the two shear studs through the gasket and into the
 brake flange holes at the 3 o'clock and 9 o'clock positions (12 o'clock position is straight up with the gear down and locked): a) Apply a layer of BMS 5-95 sealant on the part of the
 stud shanks that is not threaded. b) Push the studs into the holes on the brake flange.
 NOTE: A temperature differential fit (refer to
____ BAC5435) can be used to make the installation easier and/or prevent damage to the studs.
 c)  Apply a layer of Ease-Off 990 or equivalent to the
 threads of the studs. d) Install the washers and the nuts. e) Turn the nuts with a dial or a needle type torque
 wrench to find the run-on torque.
 f)  Tighten the nuts to a torque of 200 - 300 pound-inches plus the run-on torque but do not tighten more than 700 pound-inches (total torque).
 F.  Install the Main Gear Brake (Fig. 401)
 S 644-026
 (1)  
Lubricate the threads of the brake mounting bolts with Ease-Off 990 or equivalent.

 S 424-027

 (2)  
Put the brake in its position on the axle with its bleed port at the top.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 424-028
 (3)  Install the brake mounting bolts, the washers and the nuts with the bolt heads pointed to the outer end of the axle.
 NOTE: Make sure you use the correct grip length bolts during
____ installation. The correct bolt grip length is 15/16 inch.
 NOTE: Make sure that the head of the bolt is pointing toward
____ the outer end of the landing gear axle. Incorrect bolt orientation will result in interference between the bolt and the wheel grease seal.
 S 424-056
 CAUTION: IF YOU INSTALL THE SAME LOCKNUTS THAT YOU REMOVED, YOU MUST DO
_______ A CHECK TO MAKE SURE THAT THE LOCKNUTS MEET THE MINIMUM BREAKAWAY TORQUE VALUES AS GIVEN IN AMM 20-50-11.
 (4)  
Tighten the brake mounting bolts as follow:

 (a)  
Tighten the bolts to the first torque of 60-70 pound-feet in a criss-cross pattern.

 NOTE: Tighten the bolts, not the nuts.
____
 (b)  Tighten the bolts to the last torque of 125-135 pound-feet in a circular pattern.
 S 434-037
 (5)  
　
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