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Date: Thu, 05 Jan 2012 14:00:01 -0500
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From: Gary Casey <casey.gary@yahoo.com>
Reply-To: Gary Casey <casey.gary@yahoo.com>
Subject: Re: Gear shimmy
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Pete,=0AAfter much discussion and speculation, the concensus seems to be th=
at the most likely cause of your problem is either a parallelism error in o=
ne of the brake rotors(rotor not flat) or looseness of the main gear leg in=
 the receptical.=A0 It might also be looseness of the hub on the lower end =
of the gear leg, or a combination of all three.=A0 Most evidence seems to p=
oint away from the nose gear strut itself, especially in the case of a mild=
-to-moderate 30 mph shimmy.=0A=A0=0AI created an access panel that allows m=
e to jack on the spar, leaving the gear leg loose, but without that the acc=
epted procedure is to jack on the lower surface of the wing under the main =
spar.=A0 Of course, it is best to to distribute the load as much as possibl=
e.=A0 And I would recommend jacking some distance outboard to reduce the fo=
rce required.=0AGary Casey=0A=A0=0AAfter 250 shimmy free hours, I am now ge=
tting gear shimmy when my ES-P slows down through about 30 knots.  I think =
I recall folks saying this is due to looseness in the upper main gear leg s=
ockets.  Is this correct, or is there another cause?  My strut (new version=
) looks fine.=0AIf it is loose main gear, how do you suggest that I get the=
 main gear off of the ground?  There are no obvious jack points.=0AThanks f=
or the advice!=0APete
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:bo=
okman old style, new york, times, serif;font-size:12pt"><div>Pete,</div><di=
v>After much discussion and speculation, the concensus seems to be that the=
 most likely cause of your problem is either a parallelism error in one of =
the brake rotors(rotor not flat) or looseness of the main gear leg in the r=
eceptical.&nbsp; It might also be looseness of the hub on the lower end of =
the gear leg, or a combination of all three.&nbsp; Most evidence seems to p=
oint away from the nose gear strut itself, especially in the case of a mild=
-to-moderate 30 mph shimmy.</div><div>&nbsp;</div><div>I created an access =
panel that allows me to jack on the spar, leaving the gear leg loose, but w=
ithout that the accepted procedure is to jack on the lower surface of the w=
ing under the main spar.&nbsp; Of course, it is best to to distribute the l=
oad as much as possible.&nbsp; And I would recommend jacking some
 distance outboard to reduce the force required.</div><div>Gary Casey</div>=
<div>&nbsp;</div><div class=3D"yiv2139925818MsoNormal">After 250 shimmy fre=
e hours, I am now getting gear shimmy when my ES-P slows down through about=
 30 knots.  I think I recall folks saying this is due to looseness in the u=
pper main gear leg sockets.  Is this correct, or is there another cause?  M=
y strut (new version) looks fine.</div><div class=3D"yiv2139925818MsoNormal=
">  </div><div class=3D"yiv2139925818MsoNormal">If it is loose main gear, h=
ow do you suggest that I get the main gear off of the ground?  There are no=
 obvious jack points.</div><div class=3D"yiv2139925818MsoNormal">  </div><d=
iv class=3D"yiv2139925818MsoNormal">Thanks for the advice!</div><div class=
=3D"yiv2139925818MsoNormal">  </div><div class=3D"yiv2139925818MsoNormal">P=
ete</div></div></body></html>
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