On Mar 24, 6:20*am, "
wrote:

Bottom line, I don't think there is any sailplane where as non tso'd
radio can't be used. *Same for transponder.

Cookie

Transponders do need to meet TSO requirements as per 91.215:

(a) All airspace: U.S.-registered civil aircraft. For operations not
conducted under part 121 or 135 of this chapter, ATC transponder
equipment installed must meet the performance and environmental
requirements of any class of TSO-C74b (Mode A) or any class of TSO-
C74c (Mode A with altitude reporting capability) as appropriate, or
the appropriate class of TSO-C112 (Mode S).