BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual page 501

Figure 17-5. Oxygen Mask Stowage Box
oxygen is available. Closing the doors does not
turn the shutoff valve off; the switch must be
repositioned to RESET-TEST.
Mask and Regulator Assembly
The oxygen face masks for pilot and copilot
use are stowed in the console boxes provided.
Each mask assembly includes a diluter-de-
mand flow regulator, a microphone with lead,
an oxygen supply hose, an oronasal mask shell,
and an inflatable harness. The mask is de-
signed for one-hand, quick-donning opera-
tion (Figure 17-6). A manual inflation control
(plate) to operate the inflatable harness is lo-
cated at both sides of the regulator. By press-
ing the plate, the harness is inflated. The mask
can then be quickly placed over the head.
When the plate is released, the elastic har-
ness shrinks, providing a snug fit.The N-100%
switch and PRESS TO TEST-EMERGENCY
button are located on the underside of the reg-
ulator. When pressed, the PRESS TO TEST-
E M E R G E N C Y bu t t o n p r ov i d e s p o s i t ive
pressure to the mask; rotating the button to
EMERGENCY keeps the oxygen flow under
constant positive pressure.
Oxygen is supplied to the masks by the pres-
sure-reducing valve at 72.5 psi. Oxygen flow
is available in three modes and controlled
from a manually operated selector with posi-
17-4 CL 601-3A/R
CL-600-2B16 PILOT TRAINING MANUAL
Figure 17-6. Oxygen Mask and Regulator
tions marked "N" (normal) and "100% PUSH,"
and an EMERGENCY ON-OFF rotary control
with an integral press-to-test feature. N and
100% modes are on demand, meaning that
oxygen is available only by operator breath-
ing. In the emergency mode, a constant flow
is available at slightly higher pressure. The
three modes of operation are:
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
• N (normal) mode—N (normal) auto-
matically supplies a mixture of ambient
air and oxygen (diluted) up to a cabin al-
titude of 30,000 feet. Above this altitude,
100% oxygen is available and, at alti-
tudes above 35,000 feet, the supply is
under positive pressure.
• 100% mode—100% pure oxygen is
available by pushing the selector switch
to the 100% position. This mode is se-
lected if ambient air is contaminated by
smoke, fumes, or foreign matter.
• E m e rg e n cy m o d e — T h e e m e rg e n cy
mode is obtained with the N-100%
switch in the 100% position and by de-
pressing and rotating the PRESS TO
T E S T- E M E R G E N C Y bu t t o n t o t h e
EMERGENCY position. This position
supplies 100% oxygen at a constant pos-
itive pressure to the masks regardless of
altitude or demand.
L t ée
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