R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
A. If the test confirms the fault:
(Ref. Fig. 201/TASK 32-45-00-991-001)
(1) Do a check for leakage of the parking brake control valve (72GG):
- on the Yellow brake system - relief valve (3067GM) operate the manual depressurization pushbutton to release the accumulator pressure
- on the Yellow hydraulic system, depressurize the hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
- on the accumulator pressure gage (2585GM) make sure that the nitrogen pressure is correct (Ref. AMM TASK 32-44-11-200-001).
- on the automatic selector (2576GM) at port H (at the T level), disconnect the hydraulic line from the parking brake control valve (72GG).
- install a plug on the T fitting.
- on the Yellow hydraulic system, pressurize the hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
- use the Yellow electric pump to pressurize the Yellow brake accumulator (2582GM) to 206 bar (2987.7766 psi) and stop the pump.
- do a check for hydraulic leakage of the parking brake control valve (72GG).
(a) If leakage is more than 20 drops/mm:
- replace the CTL VALVE-PARK BRK,ELEC. (72GG). (Ref. AMM TASK 32-45-51-000-001) and (Ref. AMM TASK 32-45-51-400-001)
(b) If leakage is in the permitted tolerances: - operate the manual depressurization pushbutton of the relief valve (3067GM) to release the accumulator pressure.
- on the Yellow hydraulic system, depressurize the hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
- connect the line at port H.
(2) Do a check for leakage of the relief valve (3067GM):
- on the brake manifold (3016GM) disconnect the lines at ports D, E, F and G.Install a plug at ports E, F, and G and a plug on the disconnected hydraulic lines.
- on the Yellow hydraulic system, pressurize the hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
- use the Yellow electric pump to pressurize the Yellow brake accumulator (2582GM) to 206 bar (2987.7766 psi) and stop the pump.
- on the brake manifold (3016GM) do a check for hydraulic leakage at port D.
(a) If leakage is more than 10 drops/min:
- replace the RELIEF VALVE-BRK SYS, Y (3067GM) (Ref. AMM TASK 32-44-15-000-001) (Ref. AMM TASK 32-44-15-400-001)
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Parking Brake System with Parking Brake Set to on
Figure 201/TASK 32-45-00-991-001
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞32-45-00∞∞∞∞∞∞∞∞∞∞Page 204
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(b) If leakage is in the permitted tolerances: - operate the manual depressurization pushbutton of the relief valve (3067GM) to release the accumulator pressure.
- on the Yellow hydraulic system, depressurize the hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
- connect the line at port D.
(3) Do a check for leakage of the brake Yellow-pressure dual shuttle-valve (2578GM)
- make sure that the accumulator pressure is released (operation of the manual depressurization pushbutton on the Yellow brake-system relief-valve (3067GM)
- on the dual shuttle-valve (2578GM) disconnect the lines at ports D and E and install a plug on the disconnected hydraulic lines. - on the Yellow hydraulic system, pressurize the hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
- use the Yellow electric pump to pressurize the Yellow brake accumulator (2582GM) to 206 bars (2988 psi) and stop the pump. In the cockpit, make sure that the PARKING BRK control switch is at ON 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 起落架 LANDING GEAR 2(60)
