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oxygen valve) to open, the passenger oxygen masks will
deploy, and the cabin overhead lights will illuminate to provide
maximum visibility for donning masks. This is the normal position
of the switch.
CAS Color Description
OXYGEN OFF Amber The oxygen line pressure is low (i.e., bottle
regulator is off or oxygen supply is depleted).
OXYGEN PRESS HI Amber Oxygen bottle quantity is not within the normal
range (too high).
OXYGEN QTY LOW Amber Oxygen bottle quantity is not within the normal
range (too low).
Pilot’s Manual
PM-126A 6-23
2.With the DEPLOY switch ON, oxygen is available to the passenger
distribution system and the passenger masks will deploy.
Activation of the DEPLOY switch will manually open the passenger
oxygen valve and allow oxygen pressure to deploy the
passenger masks. This position can be used to deploy the passenger
masks at any cabin altitude. During automatic deployment
of the masks, ON will illuminate.
3.With the PAX OXY/AUTO valve in the OFF position, oxygen will
not be automatically made available to the passenger distribution
system regardless of cabin altitude. This position can be
used when oxygen is required for the crew members only.
The following CAS illuminations are specific to passenger oxygen
valve operation:
CAS Color Description
PAX OXY FAIL Amber A failure of the passenger oxygen valve is
detected. Passenger oxygen mask deployment
may not be possible.
PAX OXY DEPLOY White The passenger oxygen valve is activated
(auto or manual) causing the passenger oxygen
masks to deploy.
Pilot’s Manual
6-24 PM-126A
OXYGEN SYSTEM SCHEMATIC
Figure 6-7
OVERBOARD
DISCHARGE
INDICATOR
RELIEF
VALVE
QUICK-DISCONNECT
VALVE
QUICK-DISCONNECT
VALVE
CREW
MASK
BLEED
FITTING
CREW
MASK
PASSENGER MASK
AUTOMATIC DEPLOY
@ 14,500 FEET (CABIN ALTITUDE)
TRANSDUCER
FILLER
VALVE
PASSENGER
MASK
ASSEMBLY
OXYGEN
CYLINDER
1. OXYGEN QTY LOW
3. OXYGEN OFF
4. PAX OXY FAIL
5. PAX OXY DEPLOY
CAS MESSAGES PAX
OXY/AUTO
OFF
OXY QTY
DEPLOY
ON
CABIN
PRESSURIZATION
CONTROLLER
1
2 3
4 5
2. OXYGEN PRESS HI
TEST
PORT
Altitude Compensating
Regulator Assembly
*
* Altitude
Compensating
Regulator
(Optional)
Pilot’s Manual
PM-126A 6-25
PASSENGER MASKS
The passenger oxygen masks are stowed in the headliner above the
passenger seats. Whenever the compartment doors open automatically
or manually the passenger oxygen masks will fall free and oxygen will
be available for passenger use. The reservoir bag incorporates a greencolored
chamber which will inflate when oxygen is flowing to the
mask. Passengers should don masks and pull the mask lanyard to initiate
oxygen flow. An orifice incorporated in the mask tubing connections
will provide a constant flow rate of 4.5 liters per minute. The
compartment covers can be opened manually for mask cleaning and
servicing per Maintenance Manual instructions.
PASSENGER MASK
Figure 6-8
F40-060000-008-01
GREEN INFLATED
OXYGEN OK
OXYGEN VALVE
(LANYARD OPERATED)
LANYARD
COVER
(OPEN)
OXYGEN
MASK
RESERVOIR
BAG
ELASTIC
STRAP
OXYGEN
MASK
Pilot’s Manual
6-26 PM-126A
CREW MASKS
The flight crew oxygen masks are stowed in accessible stowage cups
over each crew member’s outboard shoulder, two models of pneumatic
harness oxygen crew mask are available. The mask can be donned and
functioning within 5 seconds by using one hand (refer to the Airplane
Flight Manual for detailed operation procedures). The Puritan-Bennett
model contains a mask mounted automatic diluter-demand regulator
with single knob mode control (NORM - 100% - EMER). A purge valve
will automatically bias open when the mask is used in conjunction with
smoke goggles, the EMER position can be used to quickly purge the
goggles of smoke. The EROS model, also with a mask mounted regulator,
has the controls on the lower side of the regulator. A red control
lever (N-100%) on the forward side and a red control knob with a
normal (●) and an emergency (●) setting for controlling oxygen
supply. The purge valve is manually opened on this model.
To use the mask, the crew member grasps the mask and pulls it from
the stowage cup. Holding the mask harness inflated, don the mask,
when the mask is in position release the inflation control to allow the
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