Quote:
Originally Posted by RONSIM
If you were to install (or already have) a Mode S/ES transponder with 1090 out AND a UAT unit with 978 out, will there be some sort of conflict at the ATC end, or, with the receiver in the airplane?
Seems like I heard something that the FAA was not happy with that setup.
R.
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I found the answer, this is addressed in AC20-165.
In short, an S-ES AND a UAT is not recommended but is acceptable, as long as:
there are single data entry points for squawk code, ident, AND
the UAT must be broadcasting your 24 bit code (mode S id). The UAT may not have the anonymous feature enabled, ATC would see that as two airplanes.
Two S-ES or two UAT's may NOT be operated at the same time.
Which brings up another question: the AC says ADSB-out must have an automatic air/ground determination method. All the S-Es transponders that I have seen discuss this (squat switch, pressure switch to determine some minimum IAS, air data computer input for minimum IAS...). But I have seen no discussion about air/ground switching for any UAT. Anyone know about this?