It would have to be within a few hundred feet to generate an RA, and the pilot is heard reporting the 16 came within a couple hundred feet. That would be credible, coming from someone who flies a jet aircraft and is dependent on their ability to judge distances the way we do everyday, would it not?
TCAS II does not measure distance, it measures rates and anticipates the potential for a future collision using transponder returns. Also, considering the way an F-16 maneuvers even non-aggressively and at the rate of speed they're going, the TCAS could easily give a TA or RA and the F-16 would already be gone.
That being said, an F-16 maneuvering in a much less-than-aggressive manner (as evidenced by the turn-on seen in the radar video) than it normally operates is still far more aggressive than the average civilian will ever maneuver am aircraft. If you want to see how tight a block 50 F-16 can turn, I'll strap you to the pylon of the A-10 while I'm BFM'ing him and you can see for yourself.
So its very possible that the TCAS would have been set off without the F-16 getting within 500', simply by maneuvering around the civilian traffic
in a manner consistent with non-aggressive fighter-type maneuvering.
I'm not taking sides in this case, but to hit some of the talking points people have been making:
- Civilians are looking at a military fighter maneuvering in relation to them, and don't understand how military dudes operate their jets and what, to them, is considered 'close' or 'aggressive'
- Military dudes are looking at the civilians and wondering what the big deal is - but to them, getting a TCAS RA is a huge deal, whether or not we think we are not maneuvering aggressively on them
- Judging distances is VERY subjective. In the A-10, as well as in fighters, we do something called MIL sizing. Without getting deep into what a milliradian is, and how to break it down, basically, its taking something you know the wingspan of or fuselage length of and then comparing its apparent size to something you have to target with (HUD symbology, gunsight, etc.) to come up with a very close approximation of range. Once you do this a few thousand times, your eyeballs get used to judging distances - and this is something most civilians do not do on a regular basis. Once again, most civilians don't have another aircraft coming within 1,000' of them unless they're parked at the FBO (with the occasional IFR/VFR passing within 500'). So once again, what is close for a civilian (think of the runway illusions with short but wide runways or vice versa - same principle and your eyeballs are deceiving you) is WAY far away for a tactical jet.
- what a public relations person from the base says and what the extent of the discipline is, especially in a case like this, is far and away from what most civilians think of when they reference Hollywood-versions of the 'stereotypical military-style butt-chewing'.
Now, for a personal opinion - the comm jamm on the freq after the civilian spoke up (and continued to share his war-and-peace diatribe on the radio) and which was added to by the other guy after the first one spoke up is totally bogus. Make the call, ask for a phone number, and then shut up and fly the airplane if you are scared of being hit by another aircraft.