PTT...... Yes, unlike any other type we handle, it needs a PTT connection, but we've got a solution that seems to be working OK, it was tested today, now all I have to do is make a version that's "ramp grunt" friendly <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" /> . .. .Been there and done that on GPU's! Did have one unfriendly so and so a few months back that insisted on starting both on ground power, and as you say, with the GPU aft of the wing, it gets "interesting". Mind you, the one we all HATE is the 748, the nose gear wishbone is a bit too close to the props for comfort!. .. .Such are the joys of ground handling!