Under 14 CFR 135 operations, what is the maximum number of hours a crew member may be scheduled to fly in a rolling 24-hour period?

• A. 8 hours
• B. 10 hours
• C. 12 hours
• D. 14 hours

Answer: (B)

In Part 135 operations, flight time is limited to help prevent fatigue. The key idea here is the rolling 24-hour period: look at any consecutive 24 hours, not a fixed calendar day. Within that window, a crew member may not accumulate more than ten hours of flight time. So, if you’ve already flown six hours in the last 24 hours, you can fly up to four more hours before hitting the limit. If the 24-hour window shifts, you still can’t exceed ten hours of flight time in that new window.

This limit is part of a broader fatigue-management framework that also ties into required rest between duties, ensuring the crew isn’t overworked. The other options don’t fit because they would allow more than ten hours in a rolling 24-hour window, which could lead to unsafe levels of fatigue.