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descent is initiated If leveling off occurs at or below 25 000 ft during descent: -The cabin will reach and remain at targeted landing field pressure altitude minus 300 ft -The CABIN ALTITUDE caution and warning thresholds will reach and remain at landing field pressure altitude +650 ft and + 1550 ft respectively with both limited to 14 300 ft If a short climb followed by a level off is performed below 25 000 ft, cabin altitude will descend at a rate of -300 sea level fpm back towards 7850 ft. A subsequent aircraft descent will automatically initiate the return to the landing field pressure altitude and decrease the caution and warning thresholds. TAKEOFF AND RETURN TO BASE SEQUENCE AT FIELD ELEVATION GREATER THAN 7850 FT Similar to the takeoff at lower field elevations, as the aircraft leaves the ground, the takeoff sequence is initiated. The system will maintain the pre pressurization cabin altitude of 300 ft below takeoff pressure altitude until the aircraft reaches 6000 ft AGL or 10 minutes has elapsed. If a return to base is initiated the aircraft will land slightly pressurized at the pre pres-surization value to avoid cabin bumps and the landing field elevation does not have to be reset. During this sequence, the caution and warning thresholds will be maintained at the takeoff pressure altitude. CLIMB MODE WITH SELECTED LANDING FIELD ELEVATION GREATER THAN 7850 FT When the aircraft is in climb following a takeoff from an airfield above 7850 ft, the cabin altitude will decrease at a rate of -500 sea level fpm towards the maximum normal limit of 7850 ft. The caution and warning thresholds decrease as a func-tion of the aircraft altitude and the aircraft rate of climb, but at a minimum rate of -500 sea level fpm in order for the caution threshold to reach 8500 ft and the warning threshold to reach 9400 ft before the aircraft reaches 41 000 ft. CRUISE MODE WITH SELECTED LANDING FIELD ELEVATION GREATER THAN 7850 FT When the aircraft is in cruise following a takeoff and climb from an airfield above 7850 ft, the cabin altitude will continue to decrease at a rate of -300 sea level fpm until the maximum normal cabin altitude limit for 7850 is reached. The warning and caution thresholds will continue to decrease at a rate of -300 fpm until the caution threshold of 8500 ft and the warning threshold reaches 9400 ft. Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1 02-04-06 CONTROLS AND INDICATIONS (Cont) TAKEOFF FROM AIRFIELD ABOVE 7850 FT AND LANDING FIELD ELEVATION ABOVE 7850 FT
DESCENT RATE 7850 ft CABIN ASCENT RATE 300 fpm 300 fpm ALTITUDE |
