Pilot's Operating Handbook
Section 7
Description
Edition 0 - March 05, 2019
Rev. 2
Page 7.10.5
CAS messages are dis
played in the MFD CAS window :
- PRESSU OFF indicates that the BLEED switch is in OFF position or that the
Flow Control and Shut Off Valve (FCSOV) is closed due to a system
malfunction (cabin inlet overtemperature, BDPS or FCSOV failure).
- CABIN ALTITUDE indicates that the cabin altitude is over 10000 ft.
- CABIN DIFF PRESS indicates that the cabin differential pressure is
over 6.4 psi (441 mb). The DUMP switch could be used in case of necessity to
depressurize the cabin.
- PRESSU BACKUP indicates that the GASC cannot compute optimal cabin
altitude due to a system malfunction. Under this condition, the GASC willcontrol
the cabin altitude to 9800 ft default value.
- GAS DEGRADED indicates that the pressurization system is degraded
without total loss of pressurization or that the heating system is degraded.
- GAS EVENT is displayed 45 seconds after landing if a fault on the Overheat
Thermal Switch was detected by the GASC during flight.
- MAX DIFF MODE indicates that the MAX DIFF mode is selected.
Protection - Safety
Cabin is automatically depressurized as soon as the airplane is on ground through
landing gear switches (airplane on ground) or, if necessary, by actuating DUMP
switch located on PRESSURIZATION panel (in normal operation, this switch is
protected and locked by a cover).
Overpressure and negative relief safety are managed by both OFV and SFV. The
safety functions are ensured by independent pneumatic modules fitted on both
valves, which override the GASC control when necessary.
The DUMP switch allows the pilot to open the OFV in order to depressurize the cabin.
The OFV is fitted with a cabin altitude limitation device which overrides the DUMP
function and forces the closure of the OFV if the cabin altitude reaches 14500 ft.
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