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can then be depressed with the thumb and forefinger, inflating the harness.
Releasing the inflation valve vents the harness to ambient, allowing the
elastic in the harness to create a snug fit over the nose and mouth.
Each mask/regulator stowage unit contains a PRESS TO TEST AND
RESET control lever (left door) and a flow indicator (blinker) that displays a
yellow cross (+) for oxygen flow and black for no flow. The mask/regulator
may be tested while in the stowed position as described at the end of this
section.
The PRESS TO TEST AND RESET control lever allows leak testing of the
regulator while stowed. When the control lever is depressed, the blinker will
display a yellow cross and then return to black, indicating that the regulator
is leak-tight. If the blinker remains yellow, a leak in the system should be
assumed and investigated. The PRESS TO TEST AND RESET control
lever also can be used to shut off oxygen flow to the mask/regulator and
blinker in the event of a system failure. If the left door on the stowage
compartment is first closed and then followed by depressing the PRESS
TO TEST AND RESET control lever, oxygen flow will cease.
Each mask/regulator has an inflating harness, inflation valve (red ears),
N-100% control lever, PRESS TO TEST/EMERGENCY control knob,
microphone, hose with quick-disconnect fitting and a communication
harness.
The N-100% control lever provides diluted oxygen, regulated by altitude
and demand, while in the “N” (normal) position. As cabin altitude increases,
an aneroid capsule in the mask/regulator expands to decrease ambient
airflow the wearer breathes. This action increases the oxygen to ambient
air ratio until the cabin altitude reaches 35,000 feet. At this cabin altitude,
the aneroid capsule has completely shut off ambient airflow and the wearer
is now breathing 100% oxygen. 100% oxygen flow is also supplied when
the N-100% control lever is depressed to the “100%” position.
The PRESS TO TEST/EMERGENCY control knob has three functions.
When momentarily depressed, it verifies the regulator valve will supply
oxygen under constant pressure. In the NORMAL position, it allows the
regulator’s aneroid capsule to regulate positive pressure to assist breathing
at cabin altitudes between 36,000 feet and 45,000 feet. In the
EMERGENCY position, 100% oxygen is supplied in a “positive pressure on
demand” mode to assist breathing.
3. Controls and Indications:
For airplanes SN 1000 through 1289, see Figure 1, Figure 3, Figure 4 and Figure
6 through Figure 8. For airplanes SN 1290 and subsequent, see Figure 2, Figure
3 and Figure 5 through Figure 8.
A. Caution (Amber) CAS Messages:
CAS Message Cause or Meaning
CABIN OXYGEN ON Passenger oxygen system has been activated by
either manual or automatic means.
CREW OXYGEN OFF Crew oxygen bottle is shut off at the bottle.
PAX OXYGEN OFF Passenger oxygen bottle is shut off at the bottle.
OPERATING MANUAL
2A-35-00 PRODUCTION AIRCRAFT SYSTEMS
Page 8
May 30/02
Revision 7
B. Advisory (Blue) CAS Messages:
CAS Message Cause or Meaning
AUX OXYGEN ON (1) Auxiliary oxygen source is on.
MED OXYGEN ON (1) Medical oxygen is on.
OXY SRVC DR OPEN (1) Oxygen servicing panel access door is open.
NOTE(S):
(1) These are custom programmable messages activated as desired
during outfitting.
C. Other Annunciations:
Indication Cause or Meaning
Amber PAX OXYGEN ON light on
passenger oxygen control panel.
Passenger oxygen system has been
activated by either manual or automatic
means.
Yellow cross (+) indicator (blinker) visible
on crew mask/regulator assembly.
Oxygen is flowing to crew mask/regulator
assembly.
4. Limitations:
A. Flight Manual Limitations:
(1) Oxygen Departure Pressures:
The quantity of oxygen required varies with the flight profile. The
method of determining minimum oxygen quantity is shown in Figure
9.
B. Crew Mask/Regulator Preflight Check:
This procedure allows the flight crew the ability to perform a complete
preflight check without removing the mask/regulator from its stowage
compartment.
(1) Select the crew oxygen system toggle valve switch to ON.
(2) Check the crew oxygen system supply pressure.
(3) On the crew mask/regulator stowage compartment, perform the
following based upon the type of crew mask/regulator installed:
(a) For the EROS MXP 100, slide the RESET TEST control lever
(left hand door) aft.
(b) For the EROS MXP 300, depress the PRESS TO TEST AND
RESET control lever (left hand door).
(4) Observe that a white band is visible at the top of the RESET TEST
　
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