I have done it on a few aircraft, last one was the Shorts, works very well. Just be careful with doing it on lighties as the intercoms are usually pretty poor, and you may pick up a lot of white noise, if you turn the intercom of when you do not wish to record vox, only RT, it works good then too. With a little effort you can make a patch lead to lug into a vacant headset socket, again may be a problem on a light aircraft as you might be using both sets of sockets, then maybe use a spitter. Have fun, nothing beats good quality airborne video footage!