AN bolt list for BC12D wings/undercart?

[Hank Jarrett]

Re: AN bolt list for BC12D wings/undercart?

Oh yea, I forgot about that! First time I was tightening the nut and the step moved. Hits pretty quick that it SHOULD NOT do that when the nut is tightened! Don't ever remember seeing a warning not to tighten it, but it IS a shear joint with no tension along the bolt.

Hank

[Mark Julicher]

Re: AN bolt list for BC12D wings/undercart?

So everyone with a torque wrench that can measure 8 inch pounds please raise their hand.
and...
At current shop rates, it is 5 times more expensive to measure the torque on an old nut than it is to throw it away.

[Guest]

Re: AN bolt list for BC12D wings/undercart?

So everyone with a torque wrench that can measure 8 inch pounds please raise their hand.
and...
At current shop rates, it is 5 times more expensive to measure the torque on an old nut than it is to throw it away.

Hi Mark,

I confess. I do have a hex drive screwdriver handle torque tool that will measure it

But I agree I would use a new nut before doing that.

I use the turn with finger test.

Maybe I'll measure the torque capacity of two fingers.

Sorry to make this more complex, shoulda kept quiet, too late now.

Dave

[Guest]

Re: AN bolt list for BC12D wings/undercart?

Well, I didn't mean to post the stupid basset dog. Someone needs to delete that ability.

I tried to delete my post but could not.

Hi Marty,

Worked for me when I edited the post and then used the delete button.

Dave

[M Towsley]

Re: AN bolt list for BC12D wings/undercart?

Dave,

I have the same tool. I tried to edit the post and delete, twice, it did not work. Screwy site...

Hey Dave, 6th try was the charm.

[astjp2]

Re: AN bolt list for BC12D wings/undercart?

I can torque to 5 inoz!

[Mark Julicher]

Re: AN bolt list for BC12D wings/undercart?

Dave,
Your answers are right on target! I'm just amused by some of this discussion and being my normal contrarian, flippant self I had to post about it.

[Mark Julicher]

Re: AN bolt list for BC12D wings/undercart?

I can torque to 5 inoz!

Now that is way cool!
When I had my dental implant the Orthodontist used a moment-arm torque wrench that was all on 2 inches long.

[TimHicks]

Re: AN bolt list for BC12D wings/undercart?

When I took my '46 BC12D apart, here is what I found:


Wing to fuselage joint - Front AN5-16 Rear AN4-14
Wing to liftstrut hjoint - Front AN5-15A Rear AN5-13A
lift strut to bottom fuselage joint - AN5-25A
undercart to bottom fuselage joint. - AN5-21 (both front and rear)

[TimHicks]

Re: AN bolt list for BC12D wings/undercart?

I'll also add that at the bottom of the LG where the bungee cabane strut (or whatever it's called) bolts near the wheel, I found AN5-17A.

And both of these were found slightly bent. Presumably from a hard landing (must have been the previous owner ;-) ).

Because of this, it's on my personal checklist to pull these bolts out and check them every 5 years or so.

[3Dreaming]

Re: AN bolt list for BC12D wings/undercart?

I'll also add that at the bottom of the LG where the bungee cabane strut (or whatever it's called) bolts near the wheel, I found AN5-17A.

And both of these were found slightly bent. Presumably from a hard landing (must have been the previous owner ;-) ).

Because of this, it's on my personal checklist to pull these bolts out and check them every 5 years or so.

It would be a good idea to check the bushing that is there as well.

[M Towsley]

Re: AN bolt list for BC12D wings/undercart?

Yea, what Tom above said. Check those landing gear bushings.

[Theuns]

Re: AN bolt list for BC12D wings/undercart?

That is exelent feedback, thanx guys.

Theuns