REFLECTOR: Nose Wheel shimmy

[Chuck Jensen]

Dave,

 

You probably already know a couple of the 'outs' when you get shimmy on
touch down.  Lift the nose back up, and go back up.  As you already
know, trying to brake rapidly still takes you through the regime where
the shimmy can get pretty vicious.  If a retract, tuck the gear-that
will sometimes straighten out the nose gear.  If not a retract, you can
always try again, taking great pains to be as straight with the runway
as possible.  Any crab action will certainly set it off again.  

 

If that doesn't work, go up again and apply the certain fix-go over to
the grass field that you've identified before hand.  After landing, just
hope there is someone there with a Ford wrench to plumber's straight jaw
wrench that you can tighten down on the nose gear nut.  Of course, for
those that were in the Boy Scouts, you'll have such a tool in your 'be
prepared' kit.  Fortunately, you won't get shimmy landing on grass as
the friction between the nose wheel and grass isn't great enough to
transfer the necessary energy to whip the nose wheel back and forth.

 

Chuck Jensen

 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Dave Bertram
Sent: Saturday, April 15, 2006 6:37 PM
To: reflector
Subject: REFLECTOR: Nose Wheel shimmy

 

I recently had a severe nose wheel shimmy on landing for about the
second time in the last five landings.  I talked to Scott Baker and he
told me to check the "taco gusset" at the pin holding the strut for
cracks.  I used a penetrating fluid for that and found a crack on both
sides that went all the way through.  I ordered a new strut from
Velocity and after installing it I performed a retraction test.  Due to
the "taco gusset" being thicker my nose gear door sequence valve closed
the doors before the nose gear was completely in the well jamming it
before complete retraction.  I talked to Scott Swing and he said
Velocity will be noting the difference in the newsletter.   I believe my
shimmy was caused both my the use of the old style bellview washers and
not enough tension ( 15-20 pounds) on the fork.  Always do a retraction
test after working on the gear.

Dave Bertram  N350TX 

 

 

 

 <http://www.incredimail.com/index.asp?id=54475> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.tvbf.org/mailman/private/reflector/attachments/20060415/36d0a93d/attachment.html