I don't know what happened there, all my post got deleted ? My issue was power loss at go around. I saved a flight established 10 miles out on GVA ILS 05 to try many GA. What I have noticed is that when pressing the GA keyboard key (G in my case) on short final FLAPS 50 (speed ref about 147 KTS) the plane pitch up gently and goes full GO power.At the time pitch reaches it's target value (around 20°) the plane reached about 20kts faster than target speed of FLAPS 28/ around 160 KTS so about 180 KTS at its fastest. It then pitch up real high to recover the target 160 KTS speed (About 25°/28° pitch up) As the rate of climb is so high at such pitch/power combination, you quickly come to the ACCEL altitude where you have a faster commanded airspeed coming from FMS. At the same time you have such a high pitch up and maybe there is a trap. For a reason I don't know the FMS or AP does not a good job at gaining the new speed (at ACCEL) quickly and is late reducing the high pitch up from earlier in the procedure. (See about the 20 KTS overspeed during the initial GA procedure) This is when sometime the speed goes from FMS managed (speed windows empty) to a displayed speed (possibly around the FLAPS28 value, which is low at this stage, and you become then under speed protection message and/or power reduction also. It's sounds a bit complicated but of the 5-6 GA I did I got the power reduction about 2 times only. In all cases I noticed the AP is late reducing pitch to gain the new ACCEL speed, sometimes even not before reaching the GA altitude of 7000 FT in case of GVA. The high power and pitch during the procedure is very impressive tought, and I advise anyone to try it as it is a blast. Things go very quickly and you have to enable your diversion airport at the same time before reaching your holding pattern, it's quite busy in the cockpit then...
