I am almost certain of the answer but I wanted to ask anyways,

With a PAPR-confirmed ADSB-out installed in my 601, is the biennial transponder check still required?

I have no doubt that if it's installed, it has to be current, but I can't find anything with the feds that specifies this.

Anyone have a reference for this?

Brad Cohen


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Yes, it’s still required ever 24 months.

sadly still needed. the test verifies the altitude readout and signals ability to be interrogated correctly. If you have a digital transponder (example) gamin 327 or newer, and modern encoder the test should be done in a few minutes, sadly many shops will try to tell you that a compete pitot/static test also needed . not true.  set altimeter to 29.92 and see what altitude it reports, something the 327 transponder will show if operator selects it



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