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Stephan,
Richard did a great job on his mod. I have attached a drawing of our
solution which differed only in that the nutplates were riveted to a
tube horizontally and 1/4 inch bolts used. (see drawing) It was never
submitted as I had a local machine shop that could put out the work for
about $300 and make new holes and pins, or if the 3/8 pins weren't
installed yet, we could machine the holes to a zero tolerance fit. A
drop of Loctite or two and the whole thing stayed solid for so far, 3
years. So we dropped pursuing the idea. Richard's mod 11969 is a
perfectly sound solution that should work. I just felt that Redux on
the nutplate was a bit tedious when a rivet could be put into a steel
tube quickly. I used a 1 1/4 inch tube (Sloppy fit for ease of moving
into position into an existing stab, slotted it on the bandsaw, slid it
in and marked the holes with a centering punch (inserted into a 1/4 inch
tube to center the punch on the hole and gave it a try. A $10
experiment, that works, but it too is tedious. When Roger Bull came out
with the Loctite solution and got it all approved, I sure liked not
having to go through approvals when what he did works. You know us
Yanks, instant gratification.
Regards,
Bud Yerly
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----- Original Message -----
From: Stephan Cassel<mailto:stephan@scassel.se>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Tuesday, October 16, 2012 1:15 PM
Subject: Re: Europa-List: Re: Mod 73 - slightly different
Hi Europa pilots/builders
I did the mod 73 per instructions five years ago and at first it
looked good. After a short while the play was back.
My assembly was perhaps a bit tighter then normal so the Loctite did
not penetrate enough.
In order to get rid of the play I made =93special=94 washer, situated
inside the torque tube. Now it was possible to tight the tubes hard
together.
The result was a zero play system. Complete solid for 5 year (340
hours) . I know another builder that has solved the play in the same
fashion with complete success.
Here is draft drawing that shows the parts involved. In my case it was
only necessary to change the outer bolts:
http://aero2012.scassel.se/Images/tailplanemod.PNG<http://aero2012.scasse
l.se/Images/tailplanemod.PNG>
It is necessary to create a spanner with looong shank. I used a wooden
stick and strapped the spanner to it. After 30-40 minutes and some
swearing (not much) it was tight, very tight I may add.
Additionally I made a thin black line, 4-5 cm long, on fuselage when
TP trailing edge was fully down, parallel with TP skin. This reference
line makes it very easy to catch very small play over time.
So far the TP is still on the reference line. I check this on every
pre flight.
Best regards
Stephan
LN-STE Mono in Norway.
http://www.matronics.com/Navigator?Europa-List<http://www.matronics.com/N
avigator?Europa-List>
http://www.matronics.com/contribution<http://www.matronics.com/contributi
on>
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