What is the blood alcohol content (BAC) threshold established by the FAA?

The correct threshold for blood alcohol content (BAC) established by the FAA is 0.04. This limit is significant in aviation safety regulations, as it is designed to minimize the risk of impaired performance by pilots. Operating an aircraft with a BAC at or above this level is considered illegal and can lead to severe consequences, including suspension or revocation of a pilot's certificate.

The FAA's approach to this threshold emphasizes the importance of cognitive function and motor skills, which can be adversely affected even at lower levels of alcohol consumption. Maintaining a BAC below 0.04 helps ensure that pilots are in a proper state to handle the complexities and responsibilities associated with flying.

Other thresholds mentioned in the choices do not align with FAA regulations for pilots. The 0.06, 0.02, and 0.08 levels are not established as the permissible limits for flying, thus reinforcing the intention of the FAA to maintain the highest standards of safety in aviation operations.