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Jim Frantz writes:

<If Derek has not already done so, would you please remind him to submit a
"Service Difficulty Report" to the Lancair Network News along with any
recommendations.  This is the only reliable way for other IV drivers to be
alerted about a potential failure of their centering mechanism.>

What is the (new) procedure? De we send a separate email to Jim or Marv?

I inspected my strut and discovered the Lock Tite is neither. The threads
are free to turn with about 20 pounds of force on the side of the wheel. The
roll pin is the only thing keeping the flange from unscrewing from the
strut. I suspect that the threads were not adequately degreased prior to the
application of the thread locker during assembly.

The SDR would read as follows:

Affected parts:
Early IV nose strut with centering mechanism and without "clamped" wheel
flange.

Problem:
The thread locking between the nose gear wheel flange and the strut failed
allowing the shearing forces to be borne by the rollpin which subsequently
also failed. This allowed the nose gear to yaw relative to the centering
mechanism enough to cause the nose wheel to jam in the nose gear tunnel,
preventing nose gear extension.

Inspection:
With the plane on jacks, note if the nose wheel is centered to the aircraft.
Inspect the rollpin for damage. Manually twist the nose wheel both
directions in yaw and note if there is any relative motion between the
flange and the chrome portion of the strut. Any motion between the flange
and strut is an indication that the thread locker has failed.

Repair:
Remove the strut and return for service.

This has been noted on two aircraft. One aircraft with a failed rollpin had
just finished an annual inspection where the nose strut was recharged with
nitrogen.

Brent


[All SDR's (and any other LNN-bound information) should be addressed to
me at the Lancair Network News snail mail address in Fort Myers, FL, or to
my private email address:  marvkaye@olsusa.com.  This one is already included
in the next issue of the LNN, as I was able to glean enough info from the
various posts to pass it along.  Your submission as shown will be fully
detailed in the following issue.  Thanks for sending it to the LML.

   <Marv>




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