COMMERCIAL AIRLINES REDUCE AVAILABLE OXYGEN SUPPLY WHILE REQUIRING FURTHER DISABILITY of MANDATED MASKING
Harold Saive
Modern commercial jet aircraft can fly at
altitudes of over 40,000 feet where oxygen levels are too low
for passengers and crew to survive without a supplamentary
oxygen supply.
This problem is claimed to be solved with a pressurization
system that adjusts the cabin pressure to about 7,000 feet where
oxygen content is only 16% compared to 20.9% at sea level.
Most of the US population live near coastlines where sea-level
oxygen content is 20.9%. In this scenario, most passengers
aboard a commercial jet aircraft will have their available
oxygen levels drop fom 20.9% to 16% in less than 10 minutes
where the departing airport is near sea level and the aircraft
quickly climbs to a flight level above 7,000 feet cabin
pressure, usually within a few minutes.
When a modern jet aircraft takes off it will generally
climbs-out to above 7,000 feet in less than 5 minutes where the
cabin pressure system stabilizes at 7,000 feet regardless how
much higher the aircraft continues to ascend to reach a
designated flight level, usually above 28,000.
Passengers who have little or no breathing difficulty near
sea-lavel may suffer a rapid onset of some form of respiratory
or physical distress as oxygen levels drop rapidly from 20.9% to
16% within only a few minutes.
Those who inflict Covid-19 mask mandates do not consider this
endangerment of passenger safety - particulary on long
trans-Atlantic flights where comparatively low oxygen levels of
16% persist for many hours.
This is the reaon for emergency oxygen supply masks installed
above each passenger's seat to preclude passenger injury due to
loss of cabin pressure.
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Aircraft Pressurization Beginner’s Guide
https://aerosavvy.com/aircraft-pressurization/
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Can you get altitude sickness at 7000 feet? -- Altitude sickness
or acute mountain sickness (AMS) is a condition encountered at
altitudes of 6,000 feet above sea level and higher. According to
the Institute for Altitude Medicine, between 15 and 40% of
visitors in Colorado sleeping above 8,000 feet get altitude
sickness.
https://lisbdnet.com/what-altitude-do-you-need-oxygen/
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Sickness at high altitude: a literature review
Abstract
When some individuals spend just a few hours at low atmospheric
pressure above 1,500 m (5,000 ft) - such as when climbing a
mountain or flying in a plane at high altitude - they become
ill. Altitude sickness studies originally concentrated on
life-threatening illnesses which beset determined and athletic
climbers at extreme altitudes. In recent years, however,
research attention is moving towards milder forms of sickness
reported by a significant proportion of the growing number of
visitors to mountain and ski resorts at more moderate altitude.
Some of this research is also relevant in understanding the
problems experienced by passengers in newer planes that fly at a
significantly higher equivalent cabin altitude, i.e. 2,440 m
(8,000 ft), than earlier designs. Engineering solutions - such
as enriched oxygen in enclosed spaces at altitude, or in the
case of aircraft, lower cabin altitudes - are possible, but for
an economic assessment to be realistic an engineer needs to
identify the scale of the problem and to understand the factors
determining susceptibility.
This review concentrates on the problems of mountain sickness in
the ordinary population at altitudes of around 3,000 m (10,000
ft); this is a problem of growing concern as ski resorts
develop, mountain trekking increases in popularity, and as
higher altitude cabin pressures are achieved in aircraft.
https://journals.sagepub.com/doi/abs/10.1177/146642400212200109
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