Installed Oxygen System

• System description • Limitations • Normal Procedures • Emergency Procedures

Oxygen System

• • • 77 Cubic foot tank installed in the aft tail section – Service through the baggage compartment.

O 2 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 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 O 2 maximum certified altitude.

below the aircraft – Above12,500 MSL for more the 30 minutes or, – Anytime above 14,000 MSL – Make available for passengers above 15,000 MSL • Note: – The O 2 Required light will illuminate when the aircraft has reached a pressure altitude of 12,000 feet and the system is off

Duration 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 Procedures

• Before Starting Engine – Brief passengers on the use of O

2

– Make sure masks/cannulas are readily available in-flight • Climb – Don masks/cannulas prior to reaching altitudes that require O

2

– Oxygen System On – Flowmeter adjust for final cruise altitude or to maintain O

2

saturation levels above 90% when using a pulse oximeter

Normal 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 Procedures

• Cabin Fire and Smoke/Fume Elimination – Use of O

2

during a cabin fire can pose a serious threat. – Turn O

2

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 O

2

during a cabin fire and the affects of hypoxia • Oxygen System Malfunction – Check flow meters for flow – Descent below 10,000MSL or MSA – O

2

system off

Emergency 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 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 FL250 8-10 minutes 3-5 minutes FL300 1-2 minutes FL350 FL430 FL500 and above 30-60 seconds 9-12 seconds 9-12 seconds

Pulse Oximeter

• Measures blood oxygen saturation level.

• Increase the flow of O

2

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

Scenario

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