Using XCOM and Flight Line radios in certificated gliders

Hi,

A customer has asked me whether or not it is legal to install and use a
non-FAA-approved radio such as the XCOM 760 or FlightLine FL-760 in a type
certificated glider. XCOM's statement on the subject is copied below. Some
aircraft mechanics and avionics shops seem OK with installing those radios
and other flat refuse to. I don't have anything similar from FlightLine.

Below is an excerpt from a note received from XCOM on this subject.

"Our aircraft radio is not TSO'd but it does have the necessary FAA and
FCC approvals for fitting into certified aircraft. In fact there are
hundreds in the USA fitted to aircraft in either the standard or the primary
category." He copied me on the FAA and FCC certificates - which are on my
web site he
http://www.cumulus-soaring.com/xcom.htm.

The customer has an A&P that is very hesitant to approve the use of those
radios - unless someone can show paperwork showing that they were received
approval to do so - such as a 337 that was submitted and approved.

I should know more about this, but I have received so many differing
opinions, that I don't know what to believe.

I imagine I'll get a million different opinions on this subject, and I
welcome them. But opinions are not what the customer needs. He needs
specific examples and paperwork - if possible.

Any help would be greatly appreciated.

Best Regards,

Paul Remde
Cumulus Soaring, Inc.