Obidiah, I'm taking a shot in the dark and assuming you are talking Twin Otter. The TCDS (Type Certificate) that John refers to may be found here. Just thought it may be of interest.
http://www.airweb.faa.gov/Regulatory...$FILE/A9ea.pdf
Question for you John, or any one else. The TCDS says "NOTE 5. The landing weight is 11400 lb. if the airport temperature at which the landing is to be made is at or above -20°F (-29°C). If the airport temperature is below -20°F, then the landing weight is restricted to 11000 lb."
Question. Why would that be the case?
I am surprised no-one as far as I can see has mentioned nose-wheel shimmy.
Thats because shimmy indicates maintenance is required, its not an issue of technique.