A time used by ATC to advise an aircraft that the departure release is automatically cancelled if takeoff is not made prior to a specific time.

• A. Release time
• B. Hold for release (HFR)
• C. Departure restriction
• D. Clearance void time

Answer: (D)

Clearance void time is the moment ATC puts on a departure clearance that, if you haven’t begun takeoff by then, automatically cancels that clearance. This keeps runway sequencing clear and reduces the risk of holding or conflicting clearances as you wait for takeoff. If you haven’t departed before the void time, you must obtain a new clearance from ATC before attempting to depart again. The phrase in the question matches this concept precisely: the departure release is canceled if takeoff hasn’t occurred by the specified time. Release time is simply when a clearance becomes effective, hold for release means you’re held until released, and a departure restriction relates to timing or conditions limiting departures; none of these imply automatic cancellation of the clearance after a time.