turnbuckle safety wire size requirement

[fearofpavement]

I am interested to know what the requirements are for safety wire size and style are for the BC-12D. (Pertaining to safety of the turnbuckles) ie, single or double wrap, wire size for single, wire size for double, etc. Type of wire such as stainless steel, etc.

Specifically, does the T have any other requirements different from 43.13?

I am not interested in how anybody thinks or feels it should be but actual written data from Taylorcraft.

Thanks.

[3Dreaming]

Re: turnbuckle safety wire size requirement

I have never seen anything different listed for the Taylorcraft specifically. Tom

[magman]

Re: turnbuckle safety wire size requirement

AC 43.13-1 did not exist when the BC-12D's were in production.

CAM 18 preceded AC 43-13-1.

Brass Safety Wire was extensively used at that time.

I know of no require to REPLACE it with the now commonly used

annealed Stainless.

[fearofpavement]

Re: turnbuckle safety wire size requirement

Well, the situation I have is that no matter what size cable, the thinnest safety wire addressed by 43.13 for turnbuckle safety is .040" this applies whether single or double wrapped, stainless or brass or iron. I am doing an inspection on a T that appears to have .032" ss wire. I have not actually measured it yet, just an eyeball. From my understanding, if it is .032 it will need to be replaced with some .041. This will not be a big deal but I don't want to gig something that is "approved". Thus my question. I expect that the ss wire is probably considerably stronger than brass wire but...

[magman]

Re: turnbuckle safety wire size requirement

My thought would be that if the "Unknown Agency" did NOT follow the approved

safety techniques then it's quite likely they did NOT follow the approved

rigging procedure.

I would VERIFY all is correct first & then safety the TB's.

[crispy critter]

Re: turnbuckle safety wire size requirement

The rule I was always taught about saftying the turnbuckles is that anything smaller than .041 has to be double wrapped. .041 only requires one wrap. Brass wire is made to be used on the carb & fuel system because it is less likely to cause corrosion in or around the fuel system. Plus brass is more flexible and makes tight bends easier(such as what you find inside and around a carb)then the heavier steel.

[Ragwing nut]

Re: turnbuckle safety wire size requirement

double wrap with .025 minimum 7 wraps on ends, single wrap .041 minimum 7 wraps on ends if memory serves. brass .041 only

[fearofpavement]

Re: turnbuckle safety wire size requirement

double wrap with .025 minimum 7 wraps on ends, single wrap .041 minimum 7 wraps on ends if memory serves. brass .041 only

Where do you get the info on the .025? In the 43.13 it lists .040 as the minimum size. Is there an old publication that lists this?

I personally feel that the .032 stainless that is on there is adequate from a safety standpoint but I am trying to find some verification that will allow it to remain. If I can't find anything in print anywhere i feel I need to go with what the current 43.13 calls out and change it to .041 stainless.

I know I may be spending more time researching this than it would take to actually re-wrap the turnbuckles but I am curious now and "need" to know... Where does it say .032 stainless is acceptable on turnbuckles?

[astjp2]

Re: turnbuckle safety wire size requirement

You dont need to follow the current 43, you only need to follow the minimum when it was built. I remember the .025 also but I am not near my references. Tim

[NY86]

Re: turnbuckle safety wire size requirement

You dont need to follow the current 43, you only need to follow the minimum when it was built.

OTOH, you can't go wrong following AC43-13...

[VictorBravo]

Re: turnbuckle safety wire size requirement

I also have a distant memory of there being two or three sizes that are acceptable, but the smaller sizes had to be double wrap and single wrap required the larger size. Primary control versus secondary control might also play a part?

43.13 has been re-written recently... it would have been much easier for someone writing the new version to just go with the more conservative size - especially if they were trying to save space on a page.

A quick cross-check of the old CAM-18, the old 43.13, and the new 43.13 might be an interesting comparison on the subject.

[fearofpavement]

Re: turnbuckle safety wire size requirement

Anybody have these old publications that could check on this? (For the benefit of the group?)

Like I said, I could just change it but I am curious as to the necessity.

[Guest]

Re: turnbuckle safety wire size requirement

Anybody have these old publications that could check on this? (For the benefit of the group?)

Like I said, I could just change it but I am curious as to the necessity.

CAM18, ac43.13-1a and ab43.13-1b all have the identical turnbuckle wire table with respect to wire size some notes have changed that's all.

I just looked at all three.

Dave

[fearofpavement]

Re: turnbuckle safety wire size requirement

Thanks Dave,
So did you observe the acceptable use of anything smaller than .040?

[fearofpavement]

Re: turnbuckle safety wire size requirement

Forrest, do you have any insights on this from T-craft records?