PILOT’S OPERATING HANDBOOK
SECTION 7
DESCRIPTION
Edition 0 -- October 31, 2013
Rev. 1
Page 7.10.1
7.10 - EMERGENCY OXYGEN SYSTEM
(Figure 7.10.1)
The gaseous 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.
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 8.7.1, 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,
-
a microswitch causing the
”OXYGEN”
CAS message to light on. This message lights on, 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).
