1. Installed Oxygen System
System description
Limitations
Normal Procedures
Emergency Procedures

2. Oxygen 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)

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

4. 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
Approximately 6 hours and 30 minutes.

5. Normal Procedures Before Starting Engine Climb
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

6. Normal Procedures Cruise Descent
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

7. Emergency 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

8. Emergency Procedures Steady Fault Light Flashing 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

9. Time of Useful Consciousness
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
8-10 minutes
FL250
3-5 minutes
FL300
1-2 minutes
FL350
30-60 seconds
FL430
9-12 seconds
FL500 and above

10. Pulse 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%

11. 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
The source of oxygen while using a cannula is through the nose. While talking or eating most likely you are breathing through you mouth and the oxygen available in not reaching your lungs. Stop talking for a while and start breathing through your nose.