A typical IFR clearance from a non-towered airport will usually go something like this: “N12345 is cleared to Podunk Airport via runway heading to 2000 then as filed. Climb and maintain 5000; expect 10,000 one-zero minutes after departure. Contact center on 123.45; squawk 1234. Time now:1620. Clearance void if not off by 1630. If not off by 1630, advise intentions by 1640. You’re released.” That gives you 10 minutes to get airborne. Is that enough? What does “off” mean? What if it takes you 12 minutes to take off after being released? What will ATC do?
Is Busting a Void Time A BIG Deal?
A typical IFR clearance from a non-towered airport will usually go something like this: N12345 is cleared to Podunk Airport via runway heading to 2000 then as filed. Climb and maintain 5000; expect 10,000 one-zero minutes after departure. Contact center on 123.45; squawk 1234. Time now:1620. Clearance void if not off by 1630. If not off by 1630, advise intentions by 1640. Youre released. That gives you 10 minutes to get airborne. Is that enough? What does off mean? What if it takes you 12 minutes to take off after being released? What will ATC do?
Key Takeaways:
- IFR clearances from non-towered airports include a "clearance void if not off by" time, which automatically cancels the clearance, and a later "advise intentions by" time that serves as a practical buffer for pilots to contact ATC after departure.
- ATC acknowledges that pilots need time post-takeoff from non-towered fields to climb and establish radio contact, making the "advise intentions by" time crucial for maintaining the clearance's validity even if takeoff is slightly delayed past the void time.
- Pilots are advised to request clearance only when ready for immediate departure, or to request a later void time if significant pre-takeoff preparation, such as loading passengers, is still required.
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