What is the maximum blood alcohol concentration allowed for pilots under FAR 91.17?

The maximum blood alcohol concentration allowed for pilots under FAR 91.17 is 0.04%. This regulation is in place to ensure safety in aviation, as alcohol consumption can significantly impair a pilot's ability to operate an aircraft. The law establishes a clear limit to restrict alcohol use, recognizing that even small amounts can affect performance. The 0.04% threshold reflects a balance between allowing individuals some personal freedom while prioritizing public safety in aviation operations. This limit is critical for maintaining the high standards of pilot professionalism and safety.