SUPPLEMNTAL OXYGEN

Oxygen Requirements:

FAR 135

* Above 25,000' mask on and used if one pilot leaves the cockpit.

* Above 35,000' one pilot with mask.

FAR 91/91K

* Above 35,000' mask on and used if one pilot leaves the cockpit.

* Above 41,000' one pilot with mask.

Pressurized Aircraft: Above 25,000' 10 minute supply for each occupant.

(FAR 135.157)

Eros Mask: Certified for 43,000'

Passenger: Certified for 25,000'

Time of Useful Consciousness

* The time of useful consciousness can be reduced 30 to 50 percent when the decompression is rapid because of the sudden outward flow of oxygen from the body's tissue.                             

FL 430+     USAF  9-12 sec.

FL 400       USAF  15-20 sec.

                   ALPA  15-20 sec.

FL 350       USAF 0.5-1 min.

                   ALPA 30-40 sec.

FL 300       USAF 1.5-2 min.

                   ALPA 50-60 sec.

FL 250       USAF 3-5 min.

                   ALPA 1-2 min.

FL 180       20-30 min.

USAF's Aerospace Physiology (ATC Study Guide/Workbook P-V4A-AP-SW)

ALPA Airline Pilots Association

Signs of Hypoxia

• Rapid Breathing

• Cyanosis  (bluing discoloration of lips/finger nails)

• Poor Coordination

• Lethargy

• Executing Poor Judgment

Symptoms of Hypoxia

• Fatigue

• Drowsiness

• Dizziness

• Headache

• Mental & Muscle Fatigue

• Nausea

• Breathlessness

• Hot & Cold Flashes

• Tingling

• Visual Impairment

• Euphoria