Step 1 : Introduction to the question " Why can pilots have no beards? "
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There's actually a reason why pilots don't have beards. Professional airline pilots are required to be shaven to facilitate a tight seal with auxiliary oxygen masks.
According to Federal Aviation Regulations Part 91.211, supplemental oxygen must be provided for the flight crew if cabin pressure altitudes above 12,500 feet are reached (planes with jet engines have cruising altitudes of 39,000 feet or higher).
There is some argument that not all beards or facial hair will interfere with masks but that is not a risk that airline pilots (or their employers) should be risking.
Airlines even say that you need to put on your own oxygen mask before helping others put theirs on and the same is for pilots. If they can't wear theirs properly, then they cannot properly do their jobs if something should happen.
More Info:
en.wikipedia.org
Step 2 : Answer to the question " Why can pilots have no beards? "
Beards can interfere with the seal of an oxygen mask:
Please let us know as comment, if the answer is not correct!
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