(d)
Cruise Mode (CR) In cruise the system maintains that differential pressure which was valid at the switch into cruise mode. When the selected landing field elevation is more than 3800ft. (1.5PSI) above the cabin altitude, during cruise and higher than 8000ft. the cabin altitude is increased to keep the difference constantly at 3800ft., but not above the limit of max. 8000ft..
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Climb Pressure Schedule Figure 005
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Climb Figure 006
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(e)
Descent Mode (DI) During the descent of the aircraft the internal rate limit adjusts the rate to an optimum so that the cabin pressure reaches landing field pressure just prior to landing. In this mode the cabin pressure and its rate of descent are controlled in correlation to aircraft altitude, the rate limit being based on a memorized schedule. As during take-off, to avoid a pressure bump during touch down the fuselage is pressurized with a delta p of 7 mbar (0,1 psi). At touch down the fuselage depressurizes with a cabin rate of -
18.3 mbar/min (500 SLFPM) to the landing field pressure. The outflow valve will be driven to its fully open position after 55 sec. and the system transfers 70 sec. after the GN mode is set independent of the differential pressure.
(f)
Abort Mode (AB) The purpose of the abort mode is to prevent the cabin climbing if the aircraft does not climb after take-off. (For example, if an engine failure happens after V1 the aircraft must take-off). The system will switch to the climb mode after take-off. If the aircraft descends, instead of climbing, while the altitude is below 8000 ft. or below 5000 ft. above take off field the system switches into the abort mode. The cabin pressure is then kept to the value before take-off.
4. Power Supply
____________
**ON A/C 001-003, 051-052,
(Ref. Fig. 007)
R **ON A/C 004-049, 053-099, 101-105, 151-199, 201-299, 301-302,
(Ref. Fig. 007A)
R **ON A/C 106-149, 303-399, 401-499,
R (Ref. Fig. 007B)
**ON A/C ALL
5. Interface
_________
(Ref. Fig. 008, 009, 010)
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A. System Interfaces
(1) ADIRS - Interface
-------------------------------------------------------------------------------
Parameters/Label used by the CPC -------------------------------------------------------------------------------Baro Correction mbar BCD 234 745 - 1050 mbar Ambient Static Press (Corr.) BNR 246 100 - 1100 mbar Ambient Static Press (Uncorr.) BNR 245 100 - 1100 mbar True Airspeed BNR 210 60 -599 Kts
The selection of the ADIRU 1, 2 or 3 is in accordance with the subsequent matrix:
----------------------------------------------------------------------------| Selection of ADIRU 1, 2 or 3| | |----------------------------------------------------------------------------| | Priority | 1 | 2 | 3 | | System 1 | ADIRS 1 | ADIRS 2 | ADIRS 3 | | System 2 | ADIRS 2 | ADIRS 1 | ADIRS 3 | ----------------------------------------------------------------------------
B. FMGS - Interface The information from the FMGS is used to perform normal cabin pressure control. The CPCs use the FMGS parameters as follows:
-Destination QNH BCD 140 745 -1050 mbar
-Landing Elev. BNR 256 - 2048 to 16384ft
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Pressure Control System - Schematic
Figure 007 (SHEET 1)
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Pressure Control System - Schematic
Figure 007 (SHEET 2)
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Pressure Control System - Schematic
Figure 007A (SHEET 1)
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Pressure Control System - Schematic
Figure 007A (SHEET 2)
R 1EFF : 004-049, 053-099, 101-105, 151-199, 1 21-31-00Page 21 1201-299, 301-302, 1Aug 01/05 1 1 1CES 1R Pressure Control System - Schematic R Figure 007B (SHEET 1)
R 1EFF : 106-149, 303-399, 401-499, 1 21-31-00Page 22 1 1 Aug 01/05 1 1 1CES 1R Pressure Control System - Schematic R Figure 007B (SHEET 2)
R 1EFF : 106-149, 303-399, 401-499, 1 21-31-00Page 23 1 1 Aug 01/05 1 1 1CES 1R Pressure Control System - Schematic R Figure 007B (SHEET 3)
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