On Mar 24, 3:30*pm, "
wrote:
On Mar 24, 10:29*am, 150flivver wrote:



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).

Interesting. *Up until recently the TRIG transponder was not TSO.
They were offered for sale in the USA through various dealers. *So
where did they get installed if they can't be used in US registered
civil aircraft?

I'll have to ask my boss again, but I believe the first TRIG we
installed was not TSO.

Cookie

The issue is just the "must meet the performance...." part.

That does not say must be a TSO approved part. It says it must meet
the performance requirement of a TSO.

My interpretation of this is if the A&P/IA signing off can determine
though other specifications/tests etc. that the device meets those TSO
requirements and they are comfortable signing off on the install then
you have yourself a valid install. Of course those people do so at
risk to their certificate, so not taken lightly. Again find yourself
an A&P/IA you trust and follow their advice.


Darryl