In the ADIZ, what is the land crossing requirement relative to ETA?

• A. Cross within 10 minutes and 20 miles.
• B. Cross within 2 minutes and 5 miles.
• C. Cross within 5 minutes of ETA and within 10 miles of the flight path over land.
• D. No crossing requirement.

Answer: (C)

In the ADIZ, you must clearly establish your identity as you move from outside to inside US airspace, and one practical way this is enforced is by a land-crossing rule tied to your ETA. Specifically, you’re expected to cross the land boundary within five minutes of your ETA at that boundary, and you should be within about 10 miles of your projected flight path over land. This keeps air traffic control able to verify your position against your filed plan and helps prevent gaps in identification as you transition onto land.

Other options don’t fit because they either loosen the timing and distance too much or omit a crossing requirement entirely, which would defeat the purpose of the ADIZ procedures.