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GF0210_052c
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
During this sequence, in primary mode:
. Climb . This sequence is active as long as cabin pressure is lower than the theoretical cabin pressure. The scheduled cabin pressure takes the lowest value between theoretical cabin pressure, destination landing pressure plus .300 ft, plus barometric correction. Theoretical cabin pressure is computed from the airplane altitude cruise flight level, received from FMS.
With CPC RATE at NORM, the rate of climb is limited to 500 ft/min.
With CPC RATE at HIGH, the rate of climb is automatically limited to:
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540 ft/min if airplane vertical speed is <2300 ft/min.
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800 ft/min if airplane vertical speed is >6000 ft/min.
.
Between the above values the cabin rate of change is proportional to airplane vertical speed.
Rev 12, Aug 14, 2006 Flight Crew Operating Manual Volume 2
. Descent . This sequence is active as long as the airplane is descending >500 fpm. The scheduled cabin pressure takes the lowest value between the theoretical cabin pressure and destination landing pressure .300 ft plus barometric correction.
With CPC RATE at NORM, the rate of descent is limited to 300 ft/min.
With CPC Rate at HIGH, the rate of descent is automatically limited to:
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.300 ft/min if airplane vertical speed is < .2300 ft/min
.
.800 ft/min if airplane vertical speed is > .6000 ft/min.
.
Between the above values the cabin rate of change is proportional to airplane vertical speed.
GF0210_054
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
When the LGECU indicates the airplane is in flight, the normal flight sequence is initiated (except during the take-off sequence).
During this sequence:
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Cabin pressurization is controlled with calculated rates of change according to selected landing elevation and theoretical cabin altitude schedule.
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The theoretical cabin altitude schedule provides a relation between airplane altitude and theoretical cabin altitude/pressure by taking into account the maximum climb performance of the airplane at the minimum airplane weight and the maximum differential pressure (10.33 psid) providing a cabin altitude of 5,670 feet at 51,000 feet. The theoretical schedule is designed in order to reach the maximum differential pressure at the lowest airplane altitude, with a minimum cabin rate of climb.
CRUISE ALTITUDE
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Descent . The nominal rate of descent is limited to .300 ft/min. In case of high speed descent, if CPC RATE HIGH is selected, the rate of descent is increased according to the calculation of the remaining flight time. The remaining flight time is calculated from the airplane speed received from the ADC. This increased cabin rate of change demand is automatically limited, according to the airplane vertical speed:
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