On the MCDU (PDC indication):
-
the cabin differential pressure
increases to 580 mbar (8.41 psi). On the MCDU (VSCB indication):
-
the cabin vertical speed must not bemore than 500 ft.min (152.39 m.min).
On the MCDU (VSCB indication):
-
the cabin vertical speed is 0.On the MCDU (PDC indication):
-
the cabin differential pressure is 580 mbar (8.41 psi).
On the AIR COND panel 30VU:
-
the OFF legend of the PACK 1
pushbutton switch comes on.On the MCDU (VSCB indication):
-
the cabin vertical speed is 0.On the MCDU (PDC indication):
-
the cabin differential pressure is580 mbar (8.41 psi).
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ACTION RESULT -------------------------------------------------------------------------------
7. On the CABIN PRESS section of the panel 25VU:
-with the MAN/V/S CTL switch in DN position, fully close the outflow valve (OVP indication on MCDU).
On the AIR COND panel 30VU:
-release the PACK 2 pushbutton switch when the outflow valve is closed.
8. Monitor the differential pressure decrease on the MCDU (PDC indication):
-at 560 mbar (8.12 psi), record the cabin vertical speed (VSCB indication on the MCDU). The leakage rate is permitted if the VSCB value (VSCB indication on the MCDU) is less than 1450 ft.min (441.95 m.min).
On the AIR COND panel 30VU:
-push the PACK 1 and PACK 2 pushbutton switches (the OFF legend is off).
On the CABIN PRESS section of the panel 25VU:
-with the MAN V/S CTL switch, decrease the cabin differential pressure until you get a differential pressure of 0 psi.
NOTE : The cabin vertical speed
____ must not be more than 500 ft.min (152.39 m.min) (VSCB indication on the MCDU).
9. Wait until the cabin is fully depressurized then fully open the outflow valve (OVP indication on the MCDU).
On the lower ECAM display unit, on theCAB PRESS page:
-
the outflow valve is in the fully
closed position.On the AIR COND panel 30VU:
-
the OFF legend of the PACK 2
pushbutton switch comes on.On the MCDU (PDC indication):
-
the cabin differential pressureindication decreases.
On the MCDU (VSCB indication):
-
the cabin vertical speed must not be
more than 500 ft.min (152.39 m.min).On the MCDU (PDC indication):
-
the cabin differential pressuredecreases to 0.
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R **ON A/C 301-399,
R Subtask 05-53-00-780-055-B
R A. Procedure to Measure the Leakage Rate
R WARNING : DO NOT LET THE CABIN ALTITUDE CHANGE TOO FAST. SUDDEN CHANGES_______
R IN PRESSURE CAN CAUSE INJURY TO PERSONS.
R WARNING : MAKE SURE THAT THE DIFFERENTIAL PRESSURE IS NOT MORE THAN THE_______
R VALUE SPECIFIED FOR THIS TEST.
R WARNING : DO NOT USE THE ECAM DISPLAYS TO READ THE CABIN PRESSURE_______
R PARAMETERS (CABIN DIFFERENTIAL PRESSURE, CABIN ALTITUDE, CABIN
R VERTICAL- SPEED) DURING THIS TEST.
R THE PRESSURES USED IN THIS TEST ARE MORE THAN THE MAXIMUM LIMIT
R OF THE RELATED PRESSURE SENSOR.
R WHEN THESE PRESSURES BECOME MORE THAN THE PRESSURE SENSOR
R LIMIT, ON THE ECAM DISPLAY:
R - THE CABIN DIFFERENTIAL PRESSURE INDICATION BECOMES AMBER XX
R - THE CABIN ALTITUDE INDICATION BECOMES AMBER XX
R - THE CABIN VERTICAL-SPEED INDICATION IS NO LONGER CORRECT. IF
R YOU DO NOT KNOW THE CORRECT CABIN PRESSURE VALUES, YOU CAN MAKE
R UNWANTED CHANGES IN PRESSURE THAT CAN CAUSE INJURY.
R NOTE : This procedure uses the MAN V/S CTL switch on the CABIN PRESS____
R section of the panel 25VU to control the cabin pressure.
R This switch, spring loaded to neutral, controls the outflow valve
R position:
R - UP: the outflow valve moves to the open position (the cabin
R pressure decreases)
R - DN: the outflow valve moves to the closed position (the cabin
R pressure increases)
R We recommend:
R - short action on this switch (do not hold the switch in the UP or
R DN position)
R - that you monitor the cabin vertical speed indication
R to prevent sudden changes in cabin pressure.
R -------------------------------------------------------------------------------R ACTION RESULT R ------------------------------------------------------------------------------- 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320飛機維護手冊 AMM 時間限制/維護檢查 4(158)
