aileron turnbuckles

A friend''s cub has too many exposed threads on the upper aileron turnbuckles. Are turnbuckles available that are about 5/16" to 3/8" longer than standard?
JimC

cables

Jim,
there are a set of tabs on the bottom of the control stick where the other end of
these cables are attached. You could make a new set with the added length. Use
crome moly of equill thickness and you should be able to get it approved. Wayne

Wouldn't it be easier to just replace the cable then to make special stick attachments and then try to get it approved?

The aileron turnbuckles are not your typical off the shelf style. The forked end is special in that it has longer forks. Without this the fork will "jam" at the ailerons full travel. You may not even be able to get the bolt installed in some cases.

Check the cable routing also. If it has recently been worked on you may find the cable hanging up under a fuel tank strap bolt or ribstitching. This will shorten the cable, and usually causes lots of "drag" as you move the stick. You may be able to hear the "rub". The stick should move very easily if everything is correct and well lubricated.

cables

Ed, You are right, the best way is to install a new cable if that is the problem. The
upper turn buckle is the one that goes down the strut and is easy to check for
proper installation. Sometimes to much diheadral will cause the same problem.
Hope it is fixed with out to much problem. Wayne

Approximately how many threads should be showing on the aileron turn buckles when ther at 35-40 lbs tension? doug

Turnbuckles..

How many threads are supposed to be showing anyway?

Mike

I think it's three?

Yep, right when i hit enter i grabbed my L21 maintence manual and looked. Says 2 threads showing. doug

You guys mean "maximum number of threads showing", right?

We don't want some lurker thinking his turnbuckles should all have exactly 3 threads visible.

Tempdoug's original "..how many.." threads post seemed to indicate he wondered how many threads would show at 35-40 pounds.

That question doesn't have an anwer unless it's "well, that depends.."

DAVE

sorry, heres quote out of manual, (When adjusting turnbuckles, not more than two threads should be visible at each end of turnbuckle barrel.)

Although the L21 manual says no more than 2 threads showing, AC 43.13-1B allows 3 threads. The L21 manual was written for the military, so you can use the AC43.13 number.

John