Sudden spike in speed causing instability

[machineman9]

I was doing an IFR from London to Paris in the POSKY 737-900 and shortly after take-off I switched over to autopilot. About half way across The Channel, my aircraft suddenly found about 50 extra knots, oversped and then the left wing fell down a good few degrees.

I can't remember the exact autopilot settings, but if 'overspeed' was 440knots, I had autopilot set to about 400 knots (it wasn't quite that as I was climbing up through to 15,000)

Then all of a sudden the engine power fell, my speed jumped above the maximum and the left side fell down. I was able to control it, but I'm wondering what exactly happened. Is it just a glitch in the aircraft or is there another reason as to why this happened?


Cheers

[snippyfsxer]

It is the poorly modeled wind.

[avbuff58]

yes indeed a wind issue, if some of the turbulance oscillations in FSX [especially the left to rightmovement] were to happen in real life it would immediatly call for an emergency and a landing at the nearest airport with possibly some serious injuries

[BAW0343]

I was flying an approach and was on short final in a fairly small aircraft when I got 4 sharp wind changes within a matter of seconds. I swear the plane jumped 10 ft each time and there would be no way I would have finished that landing.

Thats my biggest issue with FSX.. its drives me nuts to do an FSpassenger flight, get a 50 knot headwind that throws me overspeed which in turn is 600 points gone with no fault of my own.    and theres NO way to predict it.