Alert notice /ES and IV owners.
A recent incident in which the nose wheel became caught in the nose wheel
well which resulted in a failure of the nose gear to extend on landing. The
cause was determined to be a looseness of the nose strut clamp--/locktite coming
loose --- overturning of a tow bar --causing the nose will fork mounting flange
to turn 5°/10° off to the side from the self centering straight-ahead position.
First of all, read and become familiar with
In addition my suggestion is to;
1. Remove cowling
2. Lift engine until nose wheel is off ground. Check with straightedge - nose
wheel alignment.
If not straight-- if loose-- do not fly. Have strut overhauled by
Lancair.
3. If straight---remove nose wheel and fork bolt ( if necessary to be able to
access the clamp screw). Remove the Allen head screw on the clamp. Clean and put
locktite on threads and reinstall and torque. Put torque seal on head.
4. Use paint or other indelible marking to index the nose strut (shiny part)
and the clamp. Make this a preflight check item.
5. Additionally, make sure inside of nose wheel well has no bolts/and bolt
heads or other protrusions that will catch on any part of the nose wheel
mechanism. And Remove all insulation.
This will give a means to indicate, and possibly prevent a turning /or
failure/ from the looseness of the bottom flange in the nose strut. In the case
listed it was because of a tow bar exceeding the limits. The decal and markings
are fine--but they are very inaccurate and hard to read from a vehicle using a
tow bar.
A very important clue in this situation--is that on landing-- the airplane
tends to dart--either left or right until weight is put on the nose and the
strut compresses releasing itself from the self centering mechanism.
It is possible that a tow bar overturning will break the internal mechanism.
In this case, index marks will not indicate a failure.
Only lifting the engine /extending the nose wheel strut/checking for
looseness/ will show this problem.
Charlie K.