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this post was submitted on 25 Jul 2025
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Are they really required to obey?
I was under the impression that as PIC you can tell ATC that you are unable to follow instructions but you better be able to back it up later (ie. Flying VFR and ATC tells you to fly into a cloud). Following TCAS over ATC is definitely defensible unlike the famous 1NR. I don’t know if it’s required but it certainly seems like a good idea
Edit: I skimmed the AC from 1993 wrt TCAS:
https://www.faa.gov/documentLibrary/media/Advisory_Circular/ac120-55A.pdf
Again I skimmed not read so don’t take my next statement as proof of anything, especially if you will operate as PIC:
Generally speaking, follow TCAS unless doing so would be more dangerous
AIM 4-4-16.b.2-3
Follow RA instructions to the extent required. Communicate with ATC as soon as practical. ATC is not formally providing traffic separation service to you until you are back to following their instructions.
Always take any action needed to ensure the safety of flight, even if it's against an RA.
AIM is not regulation, but it certainly reflects the FAA's view of pilot training.