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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-132A
OXYGEN SYSTEM SCHEMATIC
Figure 6-7
1
2 3
4 5
CAS MESSAGES
PASSENGER
MASK
ASSEMBLY
BLEED
FITTING
TEST
PORT
ON
PAX
OXY/AUTO
DEPLOY
CABIN
PRESSURIZATION
CONTROLLER
PASSENGER MASK
AUTOMATIC DEPLOY
@ 14,500 FEET (CABIN ALTITUDE)
CREW
MASK
RELIEF
VALVE
OVERBOARD
DISCHARGE
INDICATOR
OXYGEN
CYLINDER
FILLER
VALVE
TRANSDUCER
OXY QTY
CREW
MASK QUICK-DISCONNECT
VALVE
QUICK-DISCONNECT
VALVE
OFF
1. OXYGEN QTY LOW
2. OXYGEN PRESS HI
3. OXYGEN OFF
4. PAX OXY FAIL
5. PAX OXY DEPLOY
ALTITUDE
COMPENSATING
REGULATOR
ASSEMBLY
F40-060000-007-01
Pilot’s Manual
PM-132A 6-25
PASSENGER MASKS
The passenger oxygen masks are stowed in the headliner above the
passenger seats. Whether 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 green
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 on the standard system.
The compartment covers can be opened manually for mask
cleaning and servicing per Aircraft Maintenance Manual instructions.
PASSENGER MASK
Figure 6-8
OXYGEN VALVE
(LANYARD OPERATED)
LANYARD
COVER
(OPEN)
OXYGEN
MASK
RESERVOIR
BAG
ELASTIC
STRAP
OXYGEN
MASK
F40-060000-008-01
Pilot’s Manual
6-26 PM-132A
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 masks are available. The masks 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 diluterdemand
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, grasp the mask and pull 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 mask to adjust into
position. Adjust mask as necessary for comfort.
CREW MASKS (EROS)
Figure 6-9
EMERGENCY
N
100%
PUSH
PRESS
TO
TEST
MAX
NORM
INFLATION
CONTROL
TAB
CONTROL
KNOB
ROLLER
CONTROL
ADJUSTABLE
HARNESS
TOGGLE
INFLATABLE
HARNESS
N-100%
CONTROL
LEVER
Pilot’s Manual
PM-132A 6-27
A “comfort control” feature (if applicable) allows the tension in the harness
to be adjusted by adding or reducing the amount of pressure in the
harness. The EROS mask is manually controlled and, in an emergency,
the adjustable harness toggle must be switched to the NORM position
to deflate the harness to full tension. On the Puritan-Bennett mask, a
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