-PDC to show the cabin differential pressure
-VSCB to show the cabin vertical speed
-OVP to show the outflow valve position.
(17)
Close and lock the sliding windows and all access doors to the pressurized area.
(18)
Do an interphone communication test between the cockpit and the ground service personnel out of the closed area (Ref. TASK 23-44-00-700-001).
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(19) Pressurize the pneumatic system:
-with the APU (Ref. TASK 12-33-21-618-001) or with the HP ground-air supply unit (Ref. TASK 12-33-21-618-001).
NOTE : you must close the access door 811 for this procedure.
____
4. Procedure
_________
Subtask 05-53-00-780-054
A. Test at a Differential Pressure of 550 mbar (7.97 psi)
WARNING : DO NOT LET THE CABIN ALTITUDE CHANGE TOO FAST. SUDDEN CHANGES
_______
IN PRESSURE CAN CAUSE INJURY TO PERSONS.
WARNING : MAKE SURE THAT THE DIFFERENTIAL PRESSURE IS NOT MORE THAN THE
_______
VALUE SPECIFIED FOR THIS TEST.
WARNING : DO NOT USE THE ECAM DISPLAYS TO READ THE CABIN PRESSURE
_______ PARAMETERS (CABIN DIFFERENTIAL PRESSURE, CABIN ALTITUDE, CABIN VERTICAL- SPEED) DURING THIS TEST. THE PRESSURES USED IN THIS TEST ARE MORE THAN THE MAXIMUM LIMIT OF THE RELATED PRESSURE SENSOR. WHEN THESE PRESSURES BECOME MORE THAN THE PRESSURE SENSOR LIMIT, ON THE ECAM DISPLAY:
-
THE CABIN DIFFERENTIAL PRESSURE INDICATION BECOMES AMBER XX
-
THE CABIN ALTITUDE INDICATION BECOMES AMBER XX
-
THE CABIN VERTICAL-SPEED INDICATION IS NO LONGER CORRECT. IF YOU DO NOT KNOW THE CORRECT CABIN PRESSURE VALUES, YOU CAN MAKE UNWANTED CHANGES IN PRESSURE THAT CAN CAUSE INJURY.
NOTE : This procedure uses the MAN V/S CTL switch on the CABIN PRESS
____ section of the panel 25VU to control the cabin pressure. This switch, spring loaded to neutral, controls the outflow valve position:
-UP: the outflow valve moves to the open position (the cabin pressure decreases)
-DN: the outflow valve moves to the closed position (the cabin
pressure increases)
We recommend:
-short action on this switch (do not hold the switch in the UP or DN position)
-that you monitor the cabin vertical speed indication to prevent sudden changes in cabin pressure.
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ACTION RESULT -------------------------------------------------------------------------------
1. On the AIR COND panel 30VU:
-adjust the cabin temperature control as necessary.
2. On the CABIN PRESS section of the panel 25VU:
-set the MAN V/S CTL switch to DN and release, the switch moves to the neutral position. Do this operation several times. This closes the outflow valve (OVP indication on the MCDU).
NOTE : The cabin vertical speed
____ must not be more than 500 ft.min (152.39 m.min) (VSCB indication on the MCDU).
-Stop when you get a cabin differential pressure of 300 mbar (4.35 psi) (PDC indication on the MCDU).
3. With the MAN/V/S CTL switch in the UP or DN position, keep the differential pressure stable at 300 mbar (4.35 psi) for 15 minutes.
On the AIR COND panel 30VU:
-make sure that the FAULT legends of the PACK 1 and PACK 2 pushbutton switches is off.
Air blows into the fuselage.
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 pressure increases to 300 mbar (4.35 psi).
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ACTION RESULT -------------------------------------------------------------------------------
4. Use the same method as in step 2 to increase the cabin differential pressure to 550 mbar
(7.97 psi).
NOTE : The cabin vertical speed
____ must not be more than 500 ft.min (152.39 m.min) (VSCB indication on MCDU).
5.
With the MAN/V/S CTL switch in the UP or DN position, keep the differential pressure stable at 550 mbar (7.97 psi).
6.
Apply the leak-detection soap solution to find leaks.
7.
On the CABIN PRESS panel 25VU:
-with the MAN V/S CTL switch, decrease the cabin differential
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