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1. 11:00 AM - Re: Allegro-List Digest: 1 Msgs - 04/20/08 (Hugh)
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| Subject: | RE: Allegro-List Digest: 1 Msgs - 04/20/08 |
Thom:
I have no shimmy in my front gear. Removing the draw bar is very simple.
Remove the 8 mm castellated nut and remove the 8 mm bolt. The forked end of
the draw bar should slide down off of its attachment (draw bar attachment
bearing) which is permanently attached to the nose gear aluminum pipe. Then
you can remove the steel pin from the back grasp fork and remove the bar
itself.
As you know I built my Allegro 2000 (Model year 2004). I am quite familiar
with the subject "draw bar". My draw bar came factory assembled, ready to
install. In the process of installing the front landing gear (which also
came fully assembled) and the back grasp fork which is field riveted and
fiber glassed on to the belly of the fuselage by the builder, I got some of
my measurements slightly off and had to slightly lengthen the draw bar
assembly.
This required me to purchase a new steel tube (7/8"x0.065", 4130 Alloy round
seamless steel tubing, MIL-T-6736 Normalized and annealed) slightly longer
than necessary, make field measurements, and cut the tube to the correct
length taking in to account the two end pieces, drill, and re-rivet
(stainless steel rivets) the two draw bar end pieces back on to the tube. I
suspect that over time and many landings either the front or back piece has
been slightly "wallowed" out allowing some "play" to develop. Carefully
inspect the bored hole through the back grasp fork and the draw bar
attachment bearing on the front gear. If these holes are "wallowed" any you
will have to replace more than the draw bar itself. I have two assembly
drawings from my assembly manual that may help you. I will be glad to fax
them to you if you want them.
If you don't have any "wallowed" out end pieces, or "wallowed" out back
grasp fork, or a "wallowed" out draw bar attachment bearing on the front
gear, then all you need is the draw bar itself. You need to make sure that
the replacement draw bar part from Fantasy Air will truly "fit" back on your
plane. I would do every thing I could to assure that it will fit with out
any field work on your part before you order it from Fantasy Air. If there
is the slightest doubt, you might consider just ordering the tube slightly
longer than required, cutting it to length from field measurements and
fixing it the way I did. The tube cost only about $5.00. Let me know if you
want the two assembly sheets I referred to.
Hugh McKay
-----Original Message-----
From: owner-allegro-list-server@matronics.com
[mailto:owner-allegro-list-server@matronics.com] On Behalf Of Allegro-List
Digest Server
Sent: Monday, April 21, 2008 2:55 AM
Subject: Allegro-List Digest: 1 Msgs - 04/20/08
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Total Messages Posted Sun 04/20/08: 1
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Today's Message Index:
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1. 09:26 AM - nose gear shimmy (Thom Riddle)
________________________________ Message 1
_____________________________________
Time: 09:26:01 AM PST US
Subject: Allegro-List: nose gear shimmy
From: "Thom Riddle" <riddletr@gmail.com>
For the first time ever, I had a bit of nose gear shimmy after landing. Our
Allegro
is the oldest one in the USA so perhaps no one else has yet experienced
this.
Ours has 565 hours on it. Upon inspecting, I found the "drawbar attachment
bearing" allowing a little fore/aft movement. Ours is factory built so I've
not had to install or remove this part which is referred to as "store
number"
06-03 and "catalogue number" 6001260 in my assembly manual.
My questions:
1) Have you had any nose gear shimmy?
2) If so, was this the cause or was it something else?
3) For those who built their Allegro, what is involved in removing the old
one
and installing the new part? It looks like removing the fork and the lower
"spacer"
will allow it to be slid off the nose gear tube.
4) I've asked B Bar D for price and availability but have not hear back from
them
yet.
--------
Thom Riddle
N221FA Allegro 2000 912UL
N197BG FS1/447
--------------------
Believe nothing, no matter where you read it or who has said it, not even if
I
have said it, unless it agrees with your own reason and your own common
sense.
- Buddha
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