Regulations and Government
FAA Amends Oxygen Mask Rule, but Not Without Controversy
Pilots raise concern about a rule amendment that went into effect on March 23 that increases the altitude at which pilots must don oxygen masks.

The U.S. FAA has amended a Part 121 rule requiring an increase in the flight level threshold at which the remaining pilot at the aircraft controls must don an oxygen mask when the other pilot leaves his or her seat. The amendment, which went into effect on March 23, increases the required flight level threshold from FL 250 to FL 410.