These reports aren't intended to point fingers at anyone. Rather, for safety's sake, we just want to spread the knowledge of what could go wrong with our aircraft. It'll help us find out if the same sort of problem crops up in more than one aircraft, too.
I'll start out with a couple of old ones:
"Tuesday evening I was flying my Baby and having a great time until I landed. The landing wasn't my smoothest, but not bad. As I was rolling out I could tell something was wrong with my tailwheel. I got out and saw that the front attaching bolt was attached to the spring, but not to the fuselage. The oak block inside the fuselage had split, letting the front of the spring drop. The break was not in a downward motion like I
thought it might be, but forward. So I put the tail over my shoulder and walked it back to my hangar.
"After looking it over and thinking there had to be a better way. I decided to rebuild it out of phenolic (partially since I had some of that and not a good supply of hardwood available). So I spent all of Wednesday morning performing surgery through the bottom of the plane and cutting, fitting and epoxying pieces of phenolic and wood. I also strengthened the way it was attached to the rest of the airframe. After letting it cure all night I got up early and repaired the fabric that I had cut away. With the weather this hot, I was able to glue, shrink, dope, silver and paint before 1:00 PM. I took her out after the sun was a little lower in the sky and it was a little cooler. All's well so far, I'll let you know in a couple of thousand hours if my phenolic attach point works or not.
"Is this a weak point in the FB or is it just me? If it is, how is everyone else repairing it? I would have asked the group first, but I couldn't stand the thought of her setting out there broken while I was in the air conditioning playing with my compooter."
[RJW Note: This is a new one on me. I haven't heard of this type of failure before, but until the last couple of years, the means didn't exist (e.g. email) to exchange this kind of information.]
The bracket that holds the tailwheel spring to the tail post sees a lot of strain. It's bolted to the tail post with 3/16" inch bolts (AN3). The lower bolt hole in the tail post tends to "oval" over time, getting the tailwheel spring a bit loose. This has been reported in at least three aircraft.
The solution is to drill the holes in the tail post to 3/8" and install some bushings, drilling the bushings out to match the bolts on the bracket. For more detail, see the Tailpost Problem Page.
Comments? Contact Ron Wanttaja .
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