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CABIN PRESSURE ALTITUDE (feet) AC FLIGHT ALTITUDE (feet)
DECENT CLIMB
-
600 -
600 0
-
600 0 5,000
-
350 575 10,000
740 1,240 15,000
1,260 1,630 17,500
1,770 2,020 20,000
4,270 4,330 30,000
5,990 5,990 35,000
6,880 6,880 37,500
7,990 7,990 41,000
A. Automatic Pressurization Modes
W Ground mode,
Bothoutflow valves are driven fullopen.
W Pre-Pressure mode, Whenthrustlevers are advancedtotake-off, the cabin is pressurizedto -
150feetat approximately300ft/min.
Flight Crew Operating Manual MASTER
CSP A-
013
ENVIRONMENTAL CONTROL SYSTEM Pressurization System Vol. 1 08-
60-
8
REV 56, Jan 31/03
W Take-Offabort mode, Whenthethrustlevers are retardedtoidle, the cabin ascendsatapproximately500 ft/min for20 seconds, thentheoutflow valves are driven fullopen.
W Climbmode, Cabin climbis in accordance with afixed schedule, cabin altitude vs aircraftaltitude atarate ofapproximately500ft/min. The controller compares selectedlanding elevation to the climb schedule,then selects thehighestpressure schedule.
W Flightabort mode, Whenthe aircrafthas maintained6,000feetaltitude orloweraltitudefor10 minutes, andthen hasinitiated adescent of1,000ft/min, the system willthen assume the elevation forthedepartingairport, regardless ofthepre-selectedlandingelevation.
W The cabin descent schedule occurs whenthe aircraft altitudeis maintainedat 0±200feetfor10 minutes. Thesystem pre-
sets adecentrateofapproximately 300 ft/min.
W The cabin fulldescent schedule occurs whenthe aircraftis in descent. Cabin altitudedecreases atapproximately300ft/min, to eitherlandingelevation, or maximum differential, whicheveris highest. Whenthelandingelevation exceeds 8,000feet, cabin altitude willbe maintained at maximum differential, untilthe aircraft descends, thenthe cabin altitudewill rate upto the pre-selected landingelevation.
W Landing mode, The cabin altitudeis driven below field elevation ortheaircraftis unpressurized. Whenthe cabin is below field elevation,thenthe cabin is ratedupatapproximately 500ft/min for60 seconds, thentheoutflow valve is driven fullopen.
W TouchandGo mode, Onaircrafttouchdown,the systemwill assume landing mode; asthethrustlevers are advanced, the systemwillschedule pre-pressure mode.
B. Manual Pressurization Modes
W UPselection, Cabin ascendsat selected rateof50fpmto 3,000 ±1000fpm. Whenthedesired cabin altitudeis reached, selectMANALTto midposition.
W DNselection, Cabin descendsat selected rateof50fpmto 3,000 ±1000fpm. Whenthedesired cabin altitudeis reached, selectMANALTto midposition.
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