Today's Message Index:
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1. 05:19 AM - Re: Cable Rigging (Al Etherington)
2. 03:38 PM - LSA presentation (Jim Belcher)
Message 1
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| Subject: | Re: Cable Rigging |
Bryan Martin wrote:
> <bryanmmartin@comcast.net>
>
> You've got that backwards. In paragraph 7-166 it says you should start
> with three threads showing and you should end with no more than four
> threads inside the barrel. The threads will turn into the barrel as
> you tighten. Basically, you have a tolerance of seven turns on the
> turnbuckle to achieve correct tension. If you get correct tension with
> more than three threads showing, your cables are too short. If you
> have to turn the threads more than four turns into the barrel, your
> cables are too long. Remember, you have at least two cables and two
> turnbuckles for each control surface and both cables will have the
> same tension so you actually have a combined tolerance of fourteen
> turns to get it right.
>
> The way I installed the cables was to first clamp the control surfaces
> in their neutral positions. Then install the thimble on one end of the
> cable and assemble the turnbuckles with several threads showing. Then
> install all the parts in their proper positions and pass the cable
> over the thimble in the unfinished end of the cable and pull it snug
> by hand and then clamp it. Then you disconnect that end of the cable
> and crimp the fitting.
>
>>
>> <aletherington@rogers.com>
>>
>> Can anyone direct me to something like "Cable Rigging for Dummies"
>> ? I thought this task would be straightforward, but I am baffled by
>> AC43.13-1B page 7-333 which seems to suggest that if I start with 4
>> threads in the turnbuckle barrel, and end with no more than three
>> threads showing, by some miracle the tension will be correct, and
>> there will still be some way to adjust tension when the cables become
>> slack. Whatever I am missing is probably obvious, but not to me.
>>
>
>
Thanks for the reply, Bryan:
That's not the first thing I've got backwards. It still seems like a
very narrow window, but I guess you get more tension per turn than I
would have thought.
Al Etherington
Message 2
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| Subject: | LSA presentation |
Back on 17 January, I said the following:
"Once a year, there are nationwide training sessions for IA's, which are used
as a basis for the continuance of our IA. One of the better ones is in the
Dallas area. It covers questions IAs are having in the field: areas of
conflicting guidance, and areas of no guidance. It also usually covers
signifcant general aviation crashes of the year, and what really happened.
I submitted my questions about LSA maintenance and certification issues to the
people who conduct that training session. I was told that they would try to
create a session to address these issues, and clarify the FAA position.
Assuming that happens, I'm going to request permission to make the LSA part
of the presentation available to this list. "
==========================================================
The presentation was last Saturday. Thanks to the kindness of the presenter, Mel
Asberry, and the representative of the firm that puts on the seminar, Lucky
Louque, I have permission to post the LSA portion of the seminar . The FAA was
present for the presentation, and voiced no corrections.
Unfortunately, the presentation was large enough that I was unable to email it
to the Matronics list for inclusion in the file repository there. I've placed
it on my web site, where I can ftp to my heart's content, as long as I pay the
bill. If has the means to move it to the Matronics site, they are welcome to
do so, as that's probably where it really needs to be. Meanwhile, it may be found
at:
http://www.anemicaardvark.com/IA/IASeminar.pdf
=========================================================
There was considerable interest amongst the IAs present. In fact, this presentation
resulted in more questions in the question and answer session than any of
the others.
Most IAs and A&Ps really don't know how to address LSA maintenance, because the
ground rules are so different from amateur built or type certificated aircraft.
I am left with the feeling that the LSA issue is still evolving, and that the
FAA is likely to make changes in the process of sorting things out.
--
============================================
Do not archive.
============================================
Jim B Belcher
BS, MS Physics, Math, Computer Science
A&P/IA
Retired aerospace technical manager
============================================
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