4J-4 Developed for Training Purposes Leerjet 35/36
February 1998
CAE SimuFlite
Crew Masks
Crew oxygen masks consist of various quick-donning, diluter-
demand oxygen masks. Regardless of the mask installed, each
allows the selection of oxygen diluted with cabin air or 100%
oxygen. In the normal position, the typical mask provides oxy-
gen diluted with cabin air depending on cabin altitude. As cabin
altitude increases, the mask regulator increases the oxygen
content until it provides 100% oxygen. In the 100% position, the
mask provides 100% on-demand oxygen, regardless of alti-
tude. In the emergency position, the mask regulator supplies
100% oxygen at positive pressure. Each mask incorporates a
microphone controlled by the OXY/MIC-ON/OFF switch on the
jack panel.
Passenger System
With the PASS OXY knob in the NORM position and the PASS
MASK knob in the AUTO position, oxygen does not flow to the
passenger oxygen masks at normal cabin altitudes.
If cabin altitude exceeds 14,000 ±750 ft, the aneroid switch
closes to supply 28V DC power to the oxygen solenoid valve.
The valve opens and oxygen flows at 60 to 80 PSI to the pas-
senger oxygen distribution system. The initial pressure surge to
the door actuator valves releases door latches that allow the
masks to fall and hang by their lanyards. Pulling on a lanyard
releases a pin and oxygen flows to the associated mask.
Placing the PASS MASK knob in the MAN position bypasses
the oxygen solenoid valve to supply oxygen to the passenger
oxygen masks regardless of cabin altitude. The masks drop
and oxygen is made available to the passengers.
To Next Page
Loading...
