Certified Flight Instructor - Flight Instructor Airplane Practice Exam

What is the minimum blood alcohol level to act as a crewmember of a civil aircraft?

1. Any detectable amount

2. .04 percent or greater

3. 0.2 percent or greater

4. .08 percent or greater

The correct answer is: .04 percent or greater

The minimum blood alcohol level to act as a crewmember of a civil aircraft is 0.04 percent or greater. This standard is in place to ensure the safety of flight operations, as alcohol can significantly impair judgment, coordination, and reaction times—critical elements for anyone responsible for operating an aircraft. The choice of 0.04 percent aligns with FAA regulations, which aim to prevent safety hazards associated with alcohol consumption. It is important to note that this measurement specifically refers to the legal limit for pilots and other crewmembers. The regulations explicitly prohibit crewmembers from flying if their blood alcohol concentration (BAC) is at or above this threshold. Choices that suggest any detectable amount or lower percentages do not reflect the established legal standards for FAA regulations. Furthermore, indicating a higher limit would contradict regulations intended for maintaining a high level of safety in aviation. Therefore, the correct answer reflects the legal requirements set forth by aviation authorities to ensure that those operating aircraft do so in a fit and unimpaired state.