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Jim, probably not too pertinent as I fly a 235 but I can induce a nose wheel
shake (exclusively on landing) if my nose tire pressure is too high.

According to my manual, my nose wheel requires no more than 25 psi for this
airplane. This seemed way too low at first glance - the tire really looks
low with a decidedly underinflated look. It kinda bugged me for quite a
while and one day I decided to pump it up so it wouldn't look so flat. Bad
Idea! All seemed OK on the following flight until landing and then - *WOW* -
the nose shook like it was trying to come off!

I immediately taxied back to the hangar, and after a thorough inspection,
dropped the pressure back to 25 psi and flew again. This time, all was just
fine on the roll-out and the airplane acted as it always had, i.e., no
shake.

Bottom line: raising my nose tire pressure seemed to cause a shimmy and
lowering it make the problem go away. Try different nose tire pressures to
see if your problem is pressure related.

Dan Schaefer

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