popay
Old Smokey, said in part,
There's sure problems if you encounter a large overspeed in turbulence and DON'T use the spoilers, and whatever other means are available (like completely closing the thrust levers) to avoid the overspeed. Fairly recently I was sitting in 160 knots Tailwind which became 80 knots in a matter of seconds, fully closed thrust levers AND fully deployed spoilers even then did not prevent a Mmo exceedance by M0.026
When I read this my mind set was overspeed not turbulence and so I was trying to workout how a wind change from 160kt to 80 kt could cause an overspeed. I didn't realise he was referring to turbulence until reading the subsequent posts.
Actually, re reading the quote above from Old Smokey I still don't understand how a wind speed reduction causes an exceedence of Mmo? I can understand one might exceed Turb Penetration speed but not Mmo.