
Replace the radio section of the aircraft.cfg with the
following and it should work ok.
[Radios]
// Radio Type = availiable, standby frequency, has glide slope
Audio.1 = 0
Com.1 = 1, 0
Nav.1 = 0, 0, 0
Adf.1 = 0
Transponder.1 = 0
Marker.1 = 0
This solved the problem for me (it also made it possible to use the Handhelds with the Ryan Sportsman package (which I uploaded here with Bill's kind permission!)
So there you have it!