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300 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.
Rev 12, Aug 14, 2006 Flight Crew Operating Manual Volume 2
AIR CONDITIONING AND PRESSURIZATION
. Between the above values the cabin rate of change is proportional to airplane vertical speed.
Landing Sequence at Field Elevation greater than 5,670 Feet
NOTE
This sequence is not active during manual pressurization operation.
This sequence does not require additional crew action, if the actual landing field elevation was selected prior to take-off. The scheduled cabin pressure is normally limited to 5,670 feet during cruise and then automatically reset to the landing field elevation as airplane is descending for landing.
Example:
Landing Elevation 11,000 feet
AIRPLANE ALTITUDE
GF0210_056b
The CABIN ALT caution (cabin altitude exceeds limits) is normally set for 8,200 feet and the CABIN ALT warning is set for 9,000 feet. When the airplane altitude decreases below 41,000 feet, with landing elevation selected to 7,230 feet or higher, the CABIN ALT caution and CABIN ALT warning start to increase proportionally to the airplane altitude. The CABIN ALT caution is active up to 1,000 feet above landing field elevation and the CABIN ALT warning up to 1,800 feet above the landing field elevation. Both CABIN ALT caution and CABIN ALT warning are limited to 14,500 feet. A CAB ALT LEVEL HI advisory message is displayed on EICAS, informing the crew that the warning and caution limits have been reset.
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
Landing Sequence at Field Elevation greater than 5,670 Feet . Levelling Off During Descent
NOTE
This sequence is not active during manual pressurization operation.
Rev 12, Aug 14, 2006 Flight Crew Operating Manual Volume 2
AIR CONDITIONING AND PRESSURIZATION
Landing Sequence at Field Elevation greater than 5,670 Feet . Levelling Off During Descent (Cont’d)
If a levelling off occurs above 41,000 feet during descent, the cabin remains at 5,670 feet. If levelling off occurs at or below 25,000 feet during descent, the cabin remains at current altitude. If levelling off between 41,000 and 25,000 feet, the cabin altitude will remain at the current altitude for 3 minutes.
11,000 feet
GF0210_057a
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
Landing Sequence at Field Elevation greater than 5,670 Feet . Levelling Off During Descent (Cont’d)
If the levelling off lasts for more than 3 minutes, the cabin altitude will descend for a 5,670 feet target cabin altitude until aircraft descent is resumed. As cabin altitude reaches 7,330 feet, the CAB ALT LEVEL HI message will be removed and the CABIN ALT caution and CABIN ALT warning messages will reset to the normal thresholds of 8,200 feet and 9,000 feet respectively.
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