Is it still the case that an aircraft can legally only have one 1090Mhz device operating at a time?
Does that mean that you cannot have an ADSB-out device (like the SkyEcho2) and a transponder on at the same time?
With the new rule that if you have a serviceable transponder fitted you are obliged to turn it on, does this mean you cannot legally use a SkyEcho2 (or similar) in a transponder equipped aircraft?
Where does that leave Ian Fraser's testing in his recent LAA article (advertainment?) seeing as he said he has a mode S transponder in his aircraft? Presumably he applied for and was granted an exception as he states “Transponders not the subject of our test were switched off“.
