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W Mid selection,
Disables allprevious MANALT selections.
Automatic mode schedules the pressurization controllers toautomatically regulate the rateof changeof cabin altitude:
W Ascentfrom500 ±75fpm.
Flight Crew Operating Manual MASTER
CSP A-
013
ENVIRONMENTAL CONTROL SYSTEM Vol. 1 08-
60-
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Pressurization System REV 56, Jan 31/03
W Decentfrom 300 ±75fpm. Manualmode rate controls are providedto manually regulatethe rateof changeto
cabin altitude:
W Ascentfrom150 ±150fpmto 3,000 ±500fpmand
W Decentfrom 100 ±100fpmto 2,500 ±500fpm..
C. Differential Pressure Control
Eachoutflow valve haspositive andnegative pressure relief. The pressure controllers normally controlthe cabin-
to-
outsidepressure to8.33psid. The valves are presetto openat amaximum positive differentialpressure of8.6 ±0.1psidandat anegative differentialpressure of .0.5psid.
D. Cabin Altitude Limitation
Altitudelimit controllers within eachoutflowvalve,operateto preventthe cabin altitude fromincreasingabove 14,250 ±750feet.
E. Emergency Depressurization
Electrical signals from theEMERDEPRESS switch commandsbothoutflow valves to open. Ifthe aircraftis at acruise altitude(above 15,000feet), thealtitudelimiters operateto prevent cabin altitudefrom exceeding14,250 ±750feet.
F. Cabin Pressure Monitoring
The system uses measurements from the twocabin pressure controllers andthe cabin pressure acquisition module (CPAM)to controland monitorthesystem. TheCPAM supplies signals to theEICASto displaythefollowing information:
W Cabin altitude(z)
W Cabin altitude rateof change(dz/dt)
W Cabin to ambientdifferentialpressure (delta P)
W CPAMfailure -
IfaCPAMfails, the redundant controller willassume the function of thefailedCPAM(indications only)
W Ifthe PASSSIGNS switches are selected to AUTO, the CPAMwill cause the NO SMKGandSEATBLTS signsto come onwhenthe cabin altitude reaches10,000 feet
W The CPAMwill automaticallytriggerthepassengeroxygenautodeploysystem whenthe cabin altitude reaches14,000feet.
Flight Crew Operating Manual MASTER
CSP A-
013
ENVIRONMENTAL CONTROL SYSTEM Pressurization System Vol. 1 08-
60-
10
REV 56, Jan 31/03
A“CABINPRESSURE” voice alertis alsoprovidedduringthe followingEICAS
warnings:
W DIFFPRESS warning message
W CABINALT warning message(cabin altitudeabove 10,000 feet).
G. System Circuit Breakers
SYSTEM SUB-
SYSTEM CB NAME BUS BAR CB PANEL CB LOCATION NOTES
Flight CompartmentCompartment Control Panel CONT PNLCONT PNL DC ESSDC ESS 44 A10A10
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