High Altitude Operations - QT

Lesson Quicktakes cover the items that should be memorized from each of the wifiCFI Lessons. They do not cover all of the lesson details in-depth.


TRAINING REQUIREMENT

If aircraft has a service ceiling or maximum operating altitude above 25,000’ MSL.


OXYGEN REQUIREMENTS

Above 12,500’ MSL = Oxygen used for anytime over 30 min (by the flight crew).

Above 14,000’ MSL = Flight crew must use oxygen for the entire duration.

Above 15,000’ MSL = Each occupant provided with oxygen (they do not have to use).


HYPOXIA

Not enough oxygen.

Hypoxic Hypoxia = Not enough oxygen in the environment (high altitudes).

Hypemic Hypoxia = Oxygen cannot attach to blood cells (CO poisoning).

Stagnant Hypoxia = Blood not flowing (G-Forces).

Histotoxic Hypoxia = Brain rejects oxygen molecules (drugs and alcohol).


Symptoms of Hypoxia:

Cyanosis (blue fingernails and lips).

Headache.

Decreased Response times.

Impaired Judgement.

Euphoria.

Visual Impairment.

Drowsiness.

Dizzy Sensations.

Numbness.

Tingling in Fingers and Toes.


Hypoxia Corrective Actions:

Descend.

Put on an Oxygen Mask.

Stop pulling G-Forces.


DCS

Decompression Sickness


SCUBA DIVING WAIT TIMES


OTHER PHYSIOLOGICAL FACTORS


OUTFLOW VALVES

Open and close automatically to keep cabin pressure altitude.


TURBOCHARGERS


OXYGEN SYSTEMS

Continuous Flow System = Continuously supplies oxygen.

Diluter and Pressure Demand Systems = Provide more oxygen at higher altitudes and less oxygen at lower altitudes. Provide oxygen when the user inhales.

Quick Donning Masks = Can be placed on the face with one hand in under 5 seconds.


DECOMPRESSION

Rapid Decompression:

Lungs decompress faster than the cabin.

Caused by a small leak.


Explosive Decompression:

Cabin decompresses faster than lungs (leads to lung damage).

Caused by a large/fast leak.


TIMES OF USEFUL CONSCIOUSNESS


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