Pilot's Operating Handbook
Section 7
Description
Edition 0 - March 05, 2019
Rev. 3
Page 7.11.1
7.11 - Emergency oxygen system - see figure 7.11.1
The g
aseous oxygen system will be used by the crew and the passengers, when the
cabin altitude is greater than 10000 ft following a loss of pressurization or in case of
cabin air contamination.
USE OXYGEN MASK appears in the MFD CAS window (in normal conditions) and
the USE OXYGEN MASK/USE OXYGEN MASK aural warning alertsounds when the
cabin altitude is greater than 10000 ft.
The oxygen reserve is contained in an oxygen cylinder made of composite material
and located outside of the pressurized cabin into the R.H. karman. Its capacity
is 50.3 cu.ft (1425 litres) STPD (Standard Temperature Pressure Dry) and use limit
pressures are :
- maximum pressure 1850 PSIG (127 bars) at 70° F (21° C).
Evolution of this pressure according to the outside temperature is given in
section 8, figure 8.7.4, as well as on a placard on the inside of the cylinder
service door,
- minimum pressure 217 PSIG (15 bars).
The oxygen cylinder head is equipped with :
- a hand-controlled isolation valve to permit cylinder installation and removal,
- amicroswitch causing O2 CYL CLOSED tolighton. Thismessage lightson,
when the isolation valve is closed,
- a graduated pressure gage,
- a charging valve - refer to the replenishment procedure in section 8,
- an overpressure system consisting of a safety disc. This disc is designed to
rupture between 2500 and 2775 PSIG (172 and 191 bars) discharging the
cylinder contents outboard,
- a pressure reducing valve adjusting utilization pressure to a value comprised
between 64 and 85 PSIG (4.4 and 5.9 bars),
- a low pressure safety valve calibrated to 116 PSIG (8 bars).
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