On Friday, May 10, 2019 at 8:30:27 PM UTC-7, SoaringXCellence wrote:
On Friday, May 10, 2019 at 11:19:34 AM UTC-7, Paul Agnew wrote:
91.215
(c)Transponder-on operation. While in the airspace as specified in paragraph (b) of this section or in all controlled airspace, each person operating an aircraft equipped with an operable ATC transponder maintained in accordance with § 91.413 of this part shall operate the transponder, including Mode C equipment if installed, and shall reply on the appropriate code or as assigned by ATC.

You need to check the paragraph (b) mentioned above. Not all controlled airspaces (in the US) require the use of a transponder, even if it is installed.

Actually *you* need to read what is written right there properly. Wether all airspace requires a transponder or not is not important, the retirement to keep a transponder turned on once you have one installed applies to all controlled airspace. Let me help...

... blah blah blah... **or in all controlled airspace** ...ya leave the fringing transponder on

Which is what I said a few posts into this thread, and in classic ras incoherency a dozen posts later we are back to that same point.