When should I send an 'on guard' warning to an aircraft?

ATC
1

If an aircraft is inbound or flying overhead, when should I send the ‘on guard’ warning?

Does the flying overhead have something to do with making a transition?

Thanks,
Joe.

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  • If an aircraft is clearly inbound but has not contacted you.
  • If an aircraft is in your airspace and isn’t tuned to your frequency for transition clearance.

Those are the most common reasons.

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DO NOT send an on guard message if they are more than 26 NM away from you. If you are approach or centre it is farther.

4

Theres a tutorial you can search for too.

Click Here

But Tecnam pretty much answered it for this. You can browse the tutorial section for more information too ^^

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Also to add for transitions if they are above 5K feet you do not need a transition and you do not need to contact the frequency as you are high enough that your fine

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The following are the grounds to send a guard:

  1. Anyone flying above your airspace at 5000ft or below
  2. Someone who is inbound to u yet has not contacted.
    3.Someone who left your frequency without permission.
  3. Someone who started taxi on ground (in Unicom) without permission

Tower range: 24-25 miles out
Approach range: 65-67 miles out
Center range: Whole region

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