Installed Oxygen SystemInstalled Oxygen System

• System description• Limitations• Normal Procedures• Emergency Procedures

Oxygen SystemOxygen System

• 77 Cubic foot tank installed in the aft tail section

– Service through the baggage compartment.

• O2 line is plumbed above the headliner to the distribution manifold

• Control panel/annunciator panel is mounted on center console just left of the flap lever

– Master switch– Fault annunciation– Quantity indication (tank pressure)– Distribution quantity indication

(pressure to distribution manifold)

Oxygen LimitationsOxygen Limitations

• Cannulas are certified up to FL180 as per FAR part 23. Oxygen masks are required above FL180

• FAR 91.211 requires the use of O2 below the aircraft maximum certified altitude.– Above12,500 MSL for more the 30 minutes or,– Anytime above 14,000 MSL – Make available for passengers above 15,000 MSL

• Note:– The O2 Required light will illuminate when the aircraft has

reached a pressure altitude of 12,000 feet and the system is off

Duration TableDuration Table• Based on a

77 cu ft tank• Residual

oxygen below FL200 is not factored into duration table

• Includes additional 5% safety margin

What is the oxygen duration for a flight at FL190 with 2 persons aboard? See speaker notes for answer

Normal ProceduresNormal Procedures• Before Starting Engine

– Brief passengers on the use of O2

– Make sure masks/cannulas are readily available in-flight

• Climb– Don masks/cannulas prior to reaching altitudes that require O2

– Oxygen System On

– Flowmeter adjust for final cruise altitude or to maintain O2 saturation levels above 90% when using a pulse oximeter

Normal ProceduresNormal Procedures• Cruise

– Oxygen quantity check every 20 minutes

– Oxygen pressure check every 20 minutes

– Oxygen saturation level check every 20 minutes

Descent– Oxygen off after descending

through altitudes that do not require the use of oxygen

– Stow mask/cannulas

Emergency ProceduresEmergency Procedures

• Cabin Fire and Smoke/Fume Elimination– Use of O2 during a cabin fire can pose a serious threat.

– Turn O2 off and descend to an altitude that does not require the use of oxygen

– Pilot must use good judgment and weigh the risks between use of O2 during a cabin fire and the affects of hypoxia

• Oxygen System Malfunction– Check flow meters for flow– Descent below 10,000MSL or MSA

– O2 system off

Emergency ProceduresEmergency Procedures

• Steady Fault Light– Indicates a wiring

problem and the system is disabled

– Cycle Oxygen / Cabin Lights C/B

• Flashing Fault Light– Indicates oxygen

pressure fault to the distribution manifold.

– Descend to an altitude where oxygen is not required

Symptoms of HypoxiaSymptoms of Hypoxia• Treat hypoxia with 100%

oxygen.• It is a possible

emergency if no oxygen is available and you are hypoxic.– Declare emergency – Execute an immediate

emergency descent to 10,000 or MSA whichever appropriate.

Note: the useful consciousness time from 18,000 to 25,000

Time of Useful Consciousness

FL180 20-30 minutes

FL220 8-10 minutes

FL250 3-5 minutes

FL300 1-2 minutes

FL350 30-60 seconds

FL430 9-12 seconds

FL500 and above

9-12 seconds

Pulse OximeterPulse Oximeter

• Measures blood oxygen saturation level.

• Increase the flow of O2 if saturation levels drop below 90%

• Descent to a lower altitude if saturation levels can not be kept above 90%

ScenarioScenario

While using a cannula at 17,500MSL, you engage in an interesting conversation with your passengers. Shortly after, you experience shortness of breath and notice minor cyanosis in your finger tips. Oxygen flow is adequate.

• What is the problem?

See speaker notes for the answer