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I have experienced, in varying degrees and ever since the plane was first flown, a shake in the airplane that happens between 12 and 15 knots when slowing down after landing.  I have had the strut updated, the strut is properly filled, the main tires and nose tire are brand new, balanced and properly inflated (mains 65#, nose 50#), the toe-in and camber are correct.

When the shake happens, I can feel it mostly in the control stick.  I get almost no indication through the seat or floorboard and cannot detect movement visually over the cowling.  I do, however, see a serious shaking of the horizontal stabilizer.

The vibration does not occur on acceleration or when taxiing out at 12-15 knots.  It only happens on decelleration and no position of the control stick will stop it.  I have tried no brakes, some brakes and hard braking and nothing seems to help.

I would appreciate any input anyone may have about where to look next.

Thanks.

Jim Scales
98AF

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