You may have noticed that the handheld in some of the planes is not tunable. I e-mailed Bill Lyons about this and he sent me the fix the very next day (talk about fast customer service!)

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!
My first flight in a 172 on August 20, 2004&&

&&&&Doing the right thing is more important than doing the thing right. (P. Drucker) &&&&When all think alike, then no one is thinking. (Walter Lippmann)&&&&Boredom's the problem. And how do you beat Boredom?
Adventure!!!&&&&Tyler: You-You'll remember my position, won't you?&&&&Rosie: Sure! Stop by for a drink sometime!&&&&Tyler: Wait! Wait! What
is my position?&&&&Rosie: Ehhhh...beats the hell outta me! I just hope I can find my way back home!