I am an sr-20 place holder but now another 1.5 years away from delivery.
Whenever I tell someone that i am waiting for an sr-20 i discover a new reason why this is a “foolish” thing.
The latest is someone who said he heard that there are lots of radio problems flying IFR in composite planes due to charge buildup.
Larry: There has been one “radio problem” with the Cirrus SR20/22, but probably not what you have in mind. So far as I know, there has been no problem due to “charge buildup”.
The problem as I understand it is not due to the composite construction of the aircraft, but a manufacturing error in the first 50 of the SR20’s delivered. These owners were reporting problems with ATC loosing the transponder code replies.
Cirrus undertood that the transponder antenna, operating in the GHz range, needed a “ground plane” in order to function properly. This is a flat metal plate installed inside the aircraft under the front passenger seat, directly above
the transponder antenna.
When Cirrus received the complaints of poor transponder operation, a replacement ground plane was shipped. The A&P doing the installation of the “replacement” ground plane found that in fact no ground plane had been installed. The problem was narrowed to the first 50 SR20’s shipped.
To read the entire history, complaints and resolution, click “search forum” “archives” “title only” and specify the search term “transponder”. If entered properly, you should see a fairly lengthly series of posts ending in early May 2001 with the title “Transponder problems solved”.
So far as I know, this is the only performance problem related to avionics and the composite construction of the aircraft. There are certain engineering and certification issues related to installing additonal equipment where new antennas are required (radar altimeters and TCAS in particular) but these issues are largely structural rather than electronic. You might try a search of the archives with the search term “antenna” for title and text both, and see what that brings up.