Re: Where are TSO instruments required?


"mikem" <mgm17160@xxxxxxxx> wrote in message
news:1146375865.894375.236910@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

jmk wrote:
...I was thinking that there is another piece of avionics that
requires a TSO, but if there is, I can't recall it at the moment. All
the regular stuff (radios, headsets, etc.) do not.

ELT?

Sort of. You need to read the fine print.

Generally, TSOs are not required, except for IFR-approved GPS receivers.
The three "gray-area" items are ELTs, altitude encoders, and transponders.
The rules require they must "meet the requirements" of the specific TSO. So
you can use one of these without a TSO, but the onus is on you to convince
the FAA that they meet the TSO requirements. The TSO is "approved data"
that shows the compliance. So in the end, it's a lot easier to just buy
TSO'd versions of these items.

Gerry


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