(3)
Altitude Indications in AUTO/MAN Mode
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-------------------------------------------------------------------------| Take-off or | Barometric | Cabin Altitude Indication | | Landing Fields | Condition | | | Elevation | | AUTO Mode | MAN Mode | |-----------------+-----------------+----------------+------------------| | Sea Level | Low Pressure | 0 ft | 1200 ft | | | 970 mbar | | | | |-----------------+----------------+------------------| | | Standard | 0 ft | 0 ft | | | 1013 mbar | | | | |-----------------+----------------+------------------| | | High Pressure | 0 ft | -700 ft | | | 1040 mbar | | | |-----------------+-----------------+----------------+------------------| | 500 ft | Low Pressure | 500 ft | 1800 ft | | | 950 mbar | | | | |-----------------+----------------+------------------| | | Standard | 500 ft | 500 ft | | | 995 mbar | | | | |-----------------+----------------+------------------| | | High Pressure | 500 ft | -200 ft | | | 1020 mbar | | | |-----------------+-----------------+----------------+------------------| | 1000 ft | Low Pressure | 1000 ft | 2300 ft | | | 930 mbar | | | | |-----------------+----------------+------------------| | | Standard | 1000 ft | 1000 ft | | | 977 mbar | | | | |-----------------+----------------+------------------| | | High Pressure | 1000 ft | 350 ft | | | 1000 mbar | | | |-----------------+-----------------+----------------+------------------| | 2000 ft | Low Pressure | 2000 ft | 3250 ft | | | 900 mbar | | | | |-----------------+----------------+------------------| | | Standard | 2000 ft | 2000 ft | | | 942 mbar | | | | |-----------------+----------------+------------------| | | High Pressure | 2000 ft | 1200 ft | | | 970 mbar | | | -------------------------------------------------------------------------
NOTE : The accuracy of the cabin altitude indication in the MAN mode
____
is +/- 1100 ft.
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8. BITE Test
_________
A. CPC Power-Up Test
If the aircraft is on ground and
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the engines are below minimum take-off power (CPCS in ground mode),
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the CPC power-up test is done after a cold start, a reset or a power supply interrupt (> 2ms). The duration of the power-up test is 1 second. During the power-up test:
-internal devices initialize and check the hardware and the software of the CPC. When the test has passed the PRESS page shows the normal display. When the power-up test fails on the ECAM upper display unit, the warning CAB PR SYS 1(2) FAULT comes on.
B. CPC Reset For the reset of the CPCs the subsequent circuit breakers must be opened for at least 2 seconds:
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for the CPC 1, the circuit breaker 1HL which is installed on the circuit breaker panel 49VU,
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for the CPC 2, the circuit breaker 2HL which is installed on the
circuit breaker panel 122VU. When the circuit breaker for the related CPC is closed again the CPC power-up test starts.
C. Built-In Test Equipment The CPCs control the BITE function for the pressure control and monitoring system. They monitor the hardware and system performance and send failure data to the Centralized Fault Display System (CFDS) (Ref. 31-32-00). More information about a failure is available on the MCDU. On the MCDU, when the CAB PRESS CONT 1(2) page is selected the subsequent menus are available:
(1) <LAST LEG REPORT (Ref. Fig. 020) The LAST LEG REPORT shows all failures that occured during the last leg. The MCDU screen shows:
-the maintenance message of the failure,
-a fault code for shop maintenance,
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the date and time when the fault occurs,
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the ATA number of the maintenance message,
-
the FIN of the failed component.
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MCDU - LAST/PREVIOUS LEG REPORT and LRU IDENTIFICATION
Figure 020
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(2)
<PREVIOUS LEG REPORT (Ref. Fig. 020) The PREVIOUS LEGS REPORT shows all failure that occured during the last 63 legs. The MCDU screen shows:
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the flight number (aircraft tail number),
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the maintenance message of the failure,
-a fault code for shop maintenance,
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the leg number,
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the date and time when the fault occurs,
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the flight phase,
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the ATA number of the maintenance message,
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the FIN of the failed component.
(3)
<LRU IDENTIFICATION (Ref. Fig. 020) The LRU IDENTIFICATION shows the P/N of the CPCs.
