What is the maximum allowable 24-hour duty day length under 14 CFR 135.267?

What is the maximum allowable 24-hour duty day length under 14 CFR 135.267?

• A. 10 hours
• B. 12 hours
• C. 14 hours
• D. 16 hours

Answer: (C)

The maximum length of a duty day within any 24-hour period for Part 135 operations is fourteen hours. This limit is set to help manage crew fatigue by capping all on-duty time—preflight, flight time, and postflight duties—that occur in a single 24-hour window. If a flight schedule would require more than fourteen hours on duty, the operation must be split into additional duty periods with proper rest or additional crewmembers to stay within the limit.

The maximum length of a duty day within any 24-hour period for Part 135 operations is fourteen hours. This limit is set to help manage crew fatigue by capping all on-duty time—preflight, flight time, and postflight duties—that occur in a single 24-hour window. If a flight schedule would require more than fourteen hours on duty, the operation must be split into additional duty periods with proper rest or additional crewmembers to stay within the limit.