![]() Pilot performance can seriously deteriorate within 15 minutes at 15,000 feet.The effects appear following increasingly shorter periods of exposure to the increasing altitude.Effective Performance Time: refers to a pilot's ability to function, regardless of consciousness.Realize published times are in reference to a rapid decompression event.Time of Useful Consciousness: refers to the pilot's ability to remain conscious when exposed to high-pressure altitudes.This onset (gradual or rapid) and altitude will have a direct effect on the Time of Useful Consciousness ( TUC) and Effective Performance Time (EPT).The effects of hypoxia are usually quite challenging to recognize, especially when they occur gradually.The onset of hypoxia is insidious and progresses slowly, with symptoms including:.As a general rule, however, flights below 10,000 feet MSL without the use of supplemental oxygen can be considered safe, though night vision is particularly critical, and impairment of sight can occur at lower altitudes - especially for heavy smokers.Because of wide individual variations in susceptibility to hypoxia, it is impossible to predict precisely when, where, or how hypoxia reactions will occur in each pilot.Caused by alcohol and other drugs such as narcotics and poisons.The inability of the body to use oxygen.Can occur from pulling excessive Gs or cold (constricting blood vessels) temperatures may reduce blood to extremities.Oxygen deficiency in the body due to poor circulation of the blood.It can be a result of donating blood, resulting in a higher physiological altitude.After CO poisoning, it can take up to 24 hours to recover.CO attaches itself to hemoglobin about 200 times more easily than oxygen.Caused by anemia, disease, blood loss, deformed blood cells, or carbon monoxide ( CO) poisoning and with smokers.It occurs when the blood is not able to carry a sufficient amount of oxygen to the body's cells.Can occur due to faulty equipment, malfunctions, or improper use.The Earth loses 50% of its atmospheric pressure by 18,000' and 75% by 34,000'.The concentration of oxygen in the atmosphere remains consistent at all altitudes (about 21%), whereas pressure is reduced 50% by 18,000'.Note that it is a significant decrease in pressure that leads to the body's inability to absorb the oxygen.As pressure altitude increases, the partial pressure of oxygen decreases along with blood oxygen saturation.Also referred to as altitude hypoxia, hypoxic hypoxia is the lack of oxygen absorbed by the body due to atmospheric conditions. ![]()
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