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    Non-TSO for Certified Aircraft

    They have defined a "critical system." Briefly, a system is critical if continued flight and successful landing is questionable. Again, a TSO is specifically not required for transponder equipment under part 91.215. Transponders only need to meet the requirements. And in part 91.205 (com...
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    Non-TSO for Certified Aircraft

    Not my take. Their words! I think they have, from the start, considered this a major alteration. I have asked for their reasoning in writing. I believe (but am not sure) that they are considering a comm radio to be a critical system. I have two FAA documents defining "critical system" ready...
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    Non-TSO for Certified Aircraft

    I assume you are joking? I think when I am done there will be no more questions about non-TSO coms. Read the AC- it authorizes any comm radio that meets RTCA for IFR in a part 23 aircraft. One could assume they will have a difficult time excluding CAR4a aircraft operating VFR from that...
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    Non-TSO for Certified Aircraft

    I am awaiting a letter of investigation - an "LOI" in FAA-ese. It will specify the exact regulation(s) I am violating. So far, the verbal input has been rather circular, involving parts 21.8 and 21.9, a "job aid" for major/minor determinations (they maintain this 2 lb radio is a major...
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    Non-TSO for Certified Aircraft

    New guy here. Note that it is July 2021. This thread motivated me to contact my old San Diego friend Jim Weir. Let me add a bit - there is a thread on the Garmin GTR-200 - I do hope those guys see this. I have three Cubs - two with the GTR-200. It is a great radio and it has superior...
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