What counts fully towards Duty Period (DP) when on Airport Duty?

• A. Time spent on Airport Duty counts fully to DP.
• B. Time spent on Airport Duty does not count to DP.
• C. Time spent on Airport Duty counts only if a flight occurs.
• D. Time spent on Airport Duty counts only halfway to DP.

Answer: (A)

Duty Period measures the total time you are on duty from the moment it starts to the moment you are released. When you’re on Airport Duty, you’re still in a duty status, performing ground tasks or waiting between flights. That time is part of the active duty window, so it contributes to the DP in full. The clock doesn’t pause because there’s no flight; fatigue calculations are based on the entire period you’re on duty, not just airborne time. So the time spent on Airport Duty counts fully toward the Duty Period.