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Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
02-04-01 PRESSURIZATION (Cont)
AUTOMATIC PRESSURIZATION MODES
The following automatic pressurization modes are a function of the active IASC:
-Pre-pressurization mode
-Takeoff and return to base sequence
-Climb mode
-Cruise mode
-Descent mode
-Depressurization sequence on ground
PRE-PRESSURIZATION MODE
The pre-pressurization mode is activated on the ground when the thrust levers are advanced for takeoff. Pre-pressurizing the aircraft will allow the outflow valve to achieve a controlling position prior to takeoff to eliminate any noticeable pres-sure changes at takeoff. The cabin is pressurized to 300 ft below actual field elevation.
TAKEOFF AND RETURN TO BASE SEQUENCE
When the aircraft leaves the ground, the takeoff sequence is initiated. The system will maintain the pre-pressurization cabin altitude of 300 ft below field elevation until the aircraft reaches 6000 ft MSL or differential from takeoff, or 10 minutes has elapsed. If a descent is initiated the cabin altitude will descent to the takeoff altitude and the landing field elevation does not have to be reset.
CLIMB MODE
Cabin pressurization is programmed according to selected landing elevation and a theoretical schedule of cabin altitude versus aircraft altitude. The cabin climb profile varies directly with the aircraft’s climb rate. A typical cabin climb rate is approximately 300-500 sea level fpm. For light aircraft climbs at the best climb rate, the maximum cabin climb rate is 635 sea level fpm (slfpm).
NOTE: When step climbs are performed at flight altitudes greater than 25 000 ft and at aircraft climb rates greater than 6000 fpm, the cabin climb rate might exceed the max normal limit of 635 sea level fpm for automatic overpres-sure protection. For comfortable cabin climb rates during step or zoom climb it is recommended to use a max-imum aircraft climb rate of 6000 fpm.
CRUISE MODE
Cabin pressurization is programmed to activate cruise mode if the aircraft rate of climb is less than 500 sea level fpm for more than 10 seconds, or the aircraft is climbing at any rate with the aircraft altitude greater than 25 000 ft. The cabin alti-tude will be stabilized at a level in accordance with the pressure schedule.
DESCENT MODE
The rate of cabin descent is directly related to the aircraft’s rate of descent. In the case of a high-speed descent, the rate of cabin descent is increased according to the calculation of remaining flight time. The remaining flight time is calculated from the aircraft speed received from the ADC. A typical cabin descent rate is approximately 300 sea level fpm.
For example, if the aircraft’s descent rate is 2000 fpm the cabin will descend at approximately 300 sea level fpm. If the aircraft is descending at greater than 5000 fpm the cabin will descend at 750 sea level pm.
Cabin altitude will descend on schedule until the cabin altitude is approximately 300 feet below the selected landing des-tination elevation.
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