3. Job Set-up
__________
Subtask 05-53-00-865-060
A. Open, safety and tag 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 05-53-00-860-050
B. Aircraft configuration
(1)
Put the safety barriers and the warning notices in position to keep persons out of the work area.
(2)
Put the absolute pressure indicator/digital indication/sensitivity 1mbar(0.01PSI) and the vertical speed indicator in position in the cockpit.
(3)
Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
(4)
Make sure that the avionics equipment ventilation operates correctly. NOTE : If during this test, the avionics equipment ventilation stops,
____
you must stop the test.
(5)
In the avionics compartment:
(a)
Put the safety plug - ref MS21913-4 with its O-ring - ref NAS1612-4 on the air inlet of the pressure switch 16WR.
(b)
Put a safety streamer on the safety plug.
(6)
On the AIR COND panel 30VU:
-make sure that the PACK 1 and PACK 2 pushbutton switches are pushed (the FAULT legends are on).
(7)
On the CABIN PRESS section of the panel 25VU:
-release the MODE SEL pushbutton switch (the MAN legend is on).
(8)
On the EXT LT section of the panel 25VU:
-set the BEACON switch to ON.
(9)
Do the EIS start procedure (Ref. TASK 31-60-00-860-001).
(10)
On the lower ECAM display unit, on the CAB PRESS page:
-make sure that the outflow valve 10HL is in the fully open position.
(11)
On the VENTILATION section of the panel 22VU:
-
release the EXTRACT pushbutton switch (the OVRD legend comes on).
-
release the CAB FANS pushbutton switch (the OFF legend comes on).
(12)
On the CARGO HEAT section of the panel 22VU:
-make sure that the AFT ISOL VALVE pushbutton switch is released (the OFF legend is on).
(13)
On the lower ECAM display unit, on the CAB PRESS page:
-the skin air-inlet (INLET) and skin air-outlet (EXTRACT) valves are closed.
(14)
Close and lock the sliding windows and all access doors to the pressurized area.
(15)
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).
(16)
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.
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Subtask 05-53-00-970-052
R C. Calculation of the Pressure
(1)
Use the pressure indicator to measure the ambient pressure (Pamb).
(2)
Calculate and write the value below:
-value A = Pamb + 280 mbar (4.06 psi)
4. Procedure
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Subtask 05-53-00-780-050
R A. Test at a Differential Pressure of 280 mbar (4.06 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
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