-
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.
NOTE : The cabin vertical speed
____ must not be more than 500 ft.min (152.39 m.min).
-stop when you get a cabin pressure of value A (Pamb + 280 mbar (4.06 psi)).
3. With the MAN/V/S CTL switch in the UP or DN position, keep the pressure stable at a pressure of value A (Pamb + 280 mbar (4.06 psi)).
On the AIR COND panel 30VU:
-make sure that the FAULT legend of the PACK 1 and PACK 2 pushbutton switches is off.
Air blows into the fuselage.
On the vertical speed indicator:
-
the cabin vertical speed must not be
more than 500 ft.min (152.39 m.min). On the pressure indicator:
-
the cabin pressure increases to value A (Pamb + 280 mbar (4.06 psi)).
On the vertical speed indicator:
-the cabin vertical speed is 0. On the pressure indicator:
1EFF : ALL 1 05-53-00Page 506 1 1 Aug 01/03R 1 1 1CES 1
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4. Apply the leak-detection soap solution to find leaks.
5. On the CABIN PRESS section of the panel 25VU: - With the MAN V/S CTL switch, decrease the cabin 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).
R R R 6. After the cabin is fully depressurized, fully open the outflow valve.
-the cabin pressure is value A (Pamb + 280 mbar (4.06 psi)).
Record possible leaks.
On the vertical speed indicator:
-
the cabin vertical speed must not be
more than 500 ft.min (152.39 m.min). On the pressure indicator:
-
the cabin pressure decreases to the external ambient pressure.
5. Close-up
________
Subtask 05-53-00-865-061
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
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PANEL DESIGNATION IDENT. LOCATION
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R **ON A/C 062-099, 106-149, 151-199, 201-299, 301-399, 401-499,
122VU DOORS/PAX/MONG 1MQ T13 **ON A/C ALL
Subtask 05-53-00-860-054
B. Put the aircraft back to its initial configuration.
(1)
Stop the APU (Ref. TASK 12-33-21-618-001) or stop the HP ground-air supply unit (Ref. TASK 12-33-21-618-001).
(2)
On the EXT LT section of the panel 25VU:
-set the BEACON switch to OFF position.
(3)
Remove the pressure indicator and the vertical speed indicator.
(4)
Remove the safety plug from the pressure switch 16WR.
(a) In the avionics compartment:
-
remove the safety streamer from the safety plug.
-
remove the safety plug with its O-ring from the air inlet of the pressure switch 16WR.
(5)
Put the system and the aircraft back to the serviceable configuration.
(6)
Do the EIS stop procedure (Ref. TASK 31-60-00-860-002).
(7)
De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
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