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Excellent tailplane modification designed by Pat Tunney

 
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GBWFH2010



Joined: 31 Jul 2011
Posts: 38

PostPosted: Mon Dec 12, 2011 1:49 pm    Post subject: Excellent tailplane modification designed by Pat Tunney Reply with quote

At the annual inspection the amount of play in my tailplane was deemed to be unacceptable and the LAA confirmed remedial action was required. I looked at all the options available and decided to go with LAA Mod SM 11906 as designed by Pat Tunney. This solution replaces the original bolts secured with split pins by bolts secured by precisely engineered clamps that fit around the torque tube.

I have to say Pat Tunney was extremely helpful and gave me a huge amount of support with this project . He supplied the clamps and the new pins and arranged for the clamps to be precisely machined to fit my torque tube.

The actual task of removing the torque tube was quite difficult as I had to do all the work through the two side access panels. I am sure there are those who can do this job quickly, but I found it a real struggle and it took me the best part of a day. Fitting the re-engineered clamp solution was much easier and the job was done in just under three hours, even though we were doing everything slowly and carefully. I estimate that if the torque tube should need to be removed for inspection the whole job could be done in half a day.

I now have a beautifully engineered solution and a rock solid tailplane. I think Pat should be congratulated on coming up with such a good design.

I attach a picture of the installation in G-BWFH.
Gordon Grant


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Gordon Grant

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PostPosted: Mon Dec 12, 2011 3:30 pm    Post subject: Excellent tailplane modification designed by Pat Tunney Reply with quote

Hi Gordon,

What is the cost of these clamps ?
Thanks, Paul
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GBWFH2010



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PostPosted: Tue Dec 13, 2011 12:41 am    Post subject: Re: Excellent tailplane modification designed by Pat Tunney Reply with quote

The amount will vary depending on how much work is required for individual aircraft, but as a guide Pat Charged me £360. I am not sure if Pat has any more clamps in stock, as he only had a limited number made.

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