R 3. Fault Confirmation
__________________

R A. Test
R (1) Do the functional test of the brake accumulator system (Ref. AMM TASK R 32-44-00-720-002).
R 4. Fault Isolation
_______________
R A. If the test confirms the fault:

R (1) Do a check for leakage of the parking brake control valve (102GG):
R - on the Yellow brake-system relief-valve (3067GM) operate the manual
R depressurization pushbutton to release the accumulator pressure.
R - on the Yellow hydraulic system, depressurize the hydraulic
R reservoir (Ref. AMM 29140061400100).
R - on the accumulator pressure gage (2585GM) make sure that nitrogen
R pressure is correct (Ref. AMM 32441120000100).
R - on the YELLOW ALT BRAKE SELECTOR VALVE MANIFOLD (3016GM) at port F
R (at the T level and on the parking brake control valve 102GG side),
R disconnect the hydraulic line from the parking brake control valve
R (102GG).
R - install a plug on the T fitting.
R - on the parking brake selector valve (102GG) at port B (return
R line), at the T level, disconnect the hydraulic line between the
R parking brake control valve (102GG) and the T fitting.
R - install a plug on the T fitting.
R - on the Yellow hydraulic sytem, pressurize the hydraulic reservoir
R (Ref. AMM TASK 29-14-00-614-002).
R - use the Yellow electric pump to pressurize the Yellow brake
R accumulator (2582GM) to 206 bars (2988psi) and stop the pump.
R - do a check for hydraulic leakage of the parking brake control valve
R (102GG).

R (a) If the leakage is more than 1 cm3/min:
R - replace the CTL VALVE-PARK BRK, ELEC (102GG) (Ref. AMM TASK 32-R 45-51-000-001) (Ref. AMM TASK 32-45-51-400-001).

R (b) If leakage is in the permitted tolerances:
R - operate the manual depressurization pushbutton of the
R relief-valve (3067GM) to release the accumulator pressure.
R - remove the plug on the T fitting.
R - connect the line on the T fitting.

R (2) On the Yellow hydraulic system, pressurize the hydraulic reservoir
R (Ref. AMM TASK 29-14-00-614-002).
R - use the Yellow electric pump to pressurize the Yellow brake
R accumulator (2582GM) to 206 bars (2988 psi) and stop the pump.

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 401-499, ∞∞32-43-00∞∞∞∞∞∞∞∞∞∞Page 249
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R (3) If the fault continues:
R - operate the manual depressurization pushbutton of the relief-valve
R (3067GM) to release the accumulator pressure. on the Yellow
R hydraulic system, depressurize the hydraulic reservoir (Ref. AMM
R TASK 29-14-00-614-001).
R - replace the SEL VALVE-ALTN BRK (99GG) (Ref. AMM TASK 32-43-51-000-R 001) (Ref. AMM TASK 32-43-51-400-001).

R (4) On the Yellow hydraulic system, pressurize the hydraulic reservoir
R (Ref. AMM TASK 29-14-00-614-002).
R - use the Yellow electric pump to pressurize the Yellow brake
R accumulator (2582GM) to 206 bars (2988 psi) and stop the pump.

R (5) If the fault continues:
R - operate the manual depressurization pushbutton of the relief-valve
R (3067GM) to release the accumulator pressure.
R - on the Yellow hydraulic system, depressurize the hydraulic
R reservoir (Ref. AMM TASK 29-14-00-614-001).
R - replace the BRAKE RELIEF VALVE (3067GM) (Ref. AMM TASK 32-44-15-R 000-001) (Ref. AMM TASK 32-44-15-400-001).

R (6) On the Yellow hydraulic system, pressurize the hydraulic reservoir
R (Ref. AMM TASK 29-14-00-614-002).
R - use the Yellow electric pump to pressurize the Yellow brake
R accumulator (2582GM) to 206 bars (2988 psi) and stop the pump.

R (7) If the fault continues, do a check of the Yellow brake accumulator
R (2582GM):
R - operate the manual depressurization pushbutton of the relief-valve
R (3067GM) to release the accumulator pressure.
R - on the Yellow hydraulic system, depressurize the hydraulic
R reservoir (Ref. AMM TASK 29-14-00-614-001).
R - on the brake accumulator (2582GM) release the nitrogen pressure.
R - remove the ACCU-BRK YELLOW PRESS (2582GM) (Ref. AMM TASK 32-44-11-R 000-001).
R - in the accumulator, on the nitrogen side, do a check for hydraulic
R fluid (Ref. CMM 324411).

R (a) If there is hydraulic fluid:
R - replace the ACCU-BRK YELLOW PRESS (2582GM) .

R (b) If there is no hydraulic fluid:
R - replace the CHECK VALVE-BRK SYS, Y (3058GM).
R - install the Yellow brake accumulator (2582GM) (Ref. AMM TASK
R 32-44-11-400-001).
R - inflate the accumulator with nitrogen (Ref. AMM TASK 12-14-32-R 614-002).
R - On the Yellow hydraulic system, pressurize the hydraulic
　
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