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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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 Posted: Sun Oct 12, 2008 5:37 pm Post subject: Series IV Horizontal Stabilizer Struts |
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All,
Anybody remember a requirement for increasing the size of
the horizontal stab struts from 10-32 to 1/4-28? Bob did it for my
aircraft based on ? but I can't find a reference in the SBs or SLs.
It might be a series I - III issue that Bob translated to the IV.
(I'm asking for another IV owner who has the small struts.)
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.
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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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lcfitt(at)sbcglobal.net
Guest
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| Posted: Mon Oct 13, 2008 7:05 am Post subject: Series IV Horizontal Stabilizer Struts |
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Guy,
I recall, and I think it was a IV where a guy had the strut break on short
final and was able to make the landing with minimal effects. The discussion
began then. There was talk about purchase points when moving the aircraft,
lifting, and I think infight stresses - aerobatics, etc, but the real
concern was that Skystar and Denney were using Socket head bolts for the
threaded portion of the stab struts and the stresses induced into these
pieces during the weld process. Soon after that the factory began offering
the 1/4" fitting. I don't recall discussion on whether they went to
different threaded ends. I think there was at least one other instance
where a broken end was found on a preflight. My 900 hours was with the
original 10-32 ends, but checking these before each flight became part of
the preflight and I paid particular attention to what I held onto when
moving the airplane.
Lowell
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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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| Posted: Mon Oct 13, 2008 11:42 am Post subject: Re: Series IV Horizontal Stabilizer Struts |
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Guy,
My memory is the sane as lowell's about the horizontal stab struts.
Also, a service letter or bulletin was not issued. The struts with the 1/4 inch threads were offered as an upgrade.
Mine are the original 10-32 threads and I give them special attention with each preflight and never lift, sit or push on the horizontal stab.
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_________________
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Mon Oct 13, 2008 1:18 pm Post subject: Series IV Horizontal Stabilizer Struts |
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Mine were small, until I got the proper studs and rod end bearings,
and welded the studs into the existing struts. I was shocked to see
that Skystar used a socket head cap screw for a "stud", when I cut
the old one off.
Lynn Matteson
Kitfox IV Speedster
Jabiru 2200, 562 hrs, temporarily grounded as one-half of ignition
system was declared bad, and is being replaced.
On Oct 12, 2008, at 9:36 PM, Guy Buchanan wrote:
| Quote: |
All,
Anybody remember a requirement for increasing the size of
the horizontal stab struts from 10-32 to 1/4-28? Bob did it for my
aircraft based on ? but I can't find a reference in the SBs or SLs.
It might be a series I - III issue that Bob translated to the IV.
(I'm asking for another IV owner who has the small struts.)
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.
|
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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pwmac(at)sisna.com
Guest
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| Posted: Tue Oct 14, 2008 6:02 am Post subject: Series IV Horizontal Stabilizer Struts |
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The factory made an in line change with no documentation then
offered a retrofit.
After a rash of broken ends reported on this list I cut mine off and
discovered the factory had welded a cap screw in the end of the 3/8"
tube. Very bad practice due the weld messing up the heat treat of the
high strength screw which caused them to become brittle. I replaced
the thing with proper weld on ends and went to the next size (AN 490
insert if I correctly remember??). Later the factory re did the
struts and went to larger tubes. Nobody ever reported if the got rid
of the screws, but they did go the proper size which is 1/4x28
You have the correct fix.
For those with the small thread you might want to upgrade or do the
diy fix. Increasing the tube size is not necessary its the small
defective thread that is breaking off. AN parts do not break in this
application if properly sized.
Paul
===============
At 07:36 PM 10/12/2008, you wrote:
| Quote: |
All,
Anybody remember a requirement for increasing the size of
the horizontal stab struts from 10-32 to 1/4-28? Bob did it for my
aircraft based on ? but I can't find a reference in the SBs or SLs.
It might be a series I - III issue that Bob translated to the IV.
(I'm asking for another IV owner who has the small struts.)
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.
|
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http://www.matronics.com/Navigator?Kitfox-List |
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