Is this a bug?, or just a necessary evil due to the complexity of the plane? Is clearly not the engine contrails, as you can see those as well, fight from PAJN to PANC.http://youtu.be/ypCTpWAvfNU

Im sure thats a bug with-in FSX its self!!

Try hitting the "I" key. I've had that before with another aircraft and it was fixed by me doing that.

FSX bug? Not sure, this is the first time I have ever seen this and never with any other PW planes.Hit "I"?, that don't work as "I" on the PMDG is set (mapped) to cockpit light.I just did another flight in 737 700 at FL 330, had the normal contrails, and NO ground effects.Perhaps is the extreme Alaska weather that causes that... :)

I get that as well from several planes in my hangar. It seems like the tire snow spray while on the ground, sticks after lift off. My Carenado planes do this as well only during the winter or when there is snow on the ground.

That is more likely, as when I left Juno there was snow on the ground... and when I left Nashville tonight, not...

Mhm, happened with me one time I was doing crosswind patterns. A touch & go fix'd it, but that's probably not the best solution when you're flyin A to B

I get that as well from several planes in my hangar. It seems like the tire snow spray while on the ground, sticks after lift off. My Carenado planes do this as well only during the winter or when there is snow on the ground.

Ditto. Sometimes it happens, sometimes not, its a FSX bug

Must be. Every day I start FSX presents me with a different phenomenon. FSX is a strange beast eh?Instead of making "Flight" I would have thought MS could have put a nice "polish" on FSX considering the amount of high quality addons that are currently available. Not to mention the large amount in production as we speak.