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Leading Edge Spar Retaining Pin

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akanka(at)kiamichiwb.org
Guest

Posted: Fri Aug 24, 2007 5:29 am Post subject: Leading Edge Spar Retaining Pin

Does anyone know what the AN designation of the leading edge pins that go

through the leading edge (or front) spar and carry through adapter to hold

the wings in place for flight?  From measurements, the closest I can guess

is a AN395-85 Clevis Pin.  I'd hate to be wrong on this.  It could ruin

one's whole day!



John Hart

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Fri Aug 24, 2007 6:06 am Post subject: Leading Edge Spar Retaining Pin

That's the exact number that I find in my Packing List from the old  

Skystar, John....pin, clevis:AN395-85  (This is for my model IV)

Lynn Matteson

Grass Lake, Michigan

Kitfox IV Speedster  w/Jabiru 2200

flying w/395+ hrs





On Aug 24, 2007, at 9:29 AM, John W. Hart wrote:



 	  Quote: 	
		   

 <akanka(at)kiamichiwb.org>



 Does anyone know what the AN designation of the leading edge pins  

 that go

 through the leading edge (or front) spar and carry through adapter  

 to hold

 the wings in place for flight?  From measurements, the closest I  

 can guess

 is a AN395-85 Clevis Pin.  I'd hate to be wrong on this.  It could  

 ruin

 one's whole day!



 John Hart

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

akanka(at)kiamichiwb.org
Guest

Posted: Fri Aug 24, 2007 6:43 am Post subject: Leading Edge Spar Retaining Pin

Thanks Lynn.  I have a Model IV also, and I was pretty sure I had the right

critter, but I don't like guessing when it comes to parts as critical as

these.  I bought the aircraft already built, and have a lot of the

paperwork, but couldn't locate anything telling me EXACTLY what the pin is.

I appreciate the help.

John Hart



--

msm_9949(at)yahoo.com
Guest

Posted: Fri Aug 24, 2007 8:19 am Post subject: Leading Edge Spar Retaining Pin

Luggage? GPS? Comic books?

clevis_pins.pdf

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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Fri Aug 24, 2007 11:54 am Post subject: Leading Edge Spar Retaining Pin

You're welcome, John.



I was gonna add this part earlier, but figured you didn't need  

another thing to worry about. Now that you've got a few hours older  

(joke), I think you can handle it.  In Spruce's description of the  

clevis pins, it says:  "Used with clevis forks and in secondary  

controls which are not subjected to continuous operation."   Makes  

you wonder, doesn't it? 



Lynn Matteson

Grass Lake, Michigan

Kitfox IV Speedster  w/Jabiru 2200

flying w/395+ hrs

do not archive

On Aug 24, 2007, at 10:42 AM, John W. Hart wrote:



 	  Quote: 	
		   

 <akanka(at)kiamichiwb.org>



 Thanks Lynn.  I have a Model IV also, and I was pretty sure I had  

 the right

 critter, but I don't like guessing when it comes to parts as  

 critical as

 these.  I bought the aircraft already built, and have a lot of the

 paperwork, but couldn't locate anything telling me EXACTLY what the  

 pin is.

 I appreciate the help.

 John Hart

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

akanka(at)kiamichiwb.org
Guest

Posted: Fri Aug 24, 2007 1:06 pm Post subject: Leading Edge Spar Retaining Pin

No Problem. And you're right, I am a little older now!



I wasn't sure whether this was a "high shear" rated pin or just a standard

AN pin.  As I see it, these pins are in shear stress only, and not subject

to the working action you would find in a control that is constantly being

moved.  The cad plating is gone from the ones I have, and they also have a

few minor scratches that I don't like (stress risers).  I'd guess that with

all the Kitfox Aircraft flying today, that pin hasn't failed a lot, or there

would be all kinds of stuff out as service bulletins and such.



AC 43.13-1B says essentially the same thing as Aircraft Spruce:



7-102. FLATHEAD PINS (AN392

THROUGH AN406). Commonly called a clevis pin, this pin is used in

conjunction with

tie-rod terminals and in secondary controls which are not subject to

continuous operation.

The pin is normally installed with the head up, or forward, to prevent loss

should the cotter

pin fail or work out.



Thanks again for verifying that number.

John Hart



--

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Fri Aug 24, 2007 5:08 pm Post subject: Leading Edge Spar Retaining Pin

That’s because clevis pins are usually used in  moving shear applications e.g. axels for pulleys.  The application on the  'Fox and the Avid is a static shear application.  Because I fold my  wings after every flight I keep an eye peeled on the condition of the clevis pin  and if it ever gets to the point where the cad plate is worn through I'll  replace them.  

  

[img]cid:332255100(at)25082007-2B3F[/img]  

 Noel Loveys, RPP, AME intern

 Campbellton, Newfoundland, 

 Canada

 Kitfox Mod III-A, 582, B box, Ivo IFA

 Aerocet 1100s

 noelloveys(at)yahoo.ca (noelloveys(at)yahoo.ca)

 

 

 Do not archive

 



 

[quote] --

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

thesupe(at)hotmail.com
Guest

Posted: Fri Aug 24, 2007 7:41 pm Post subject: Leading Edge Spar Retaining Pin

I wonder if that doesn't refer to continuous movement.  On my Avid MI IV, I 

didn't drive my pins in all the way, maybe 1/8" high, after a bunch of hours 

of flying, they were still in the same place.  (they don't move around)   

Jim Chuk  Avid MK IV Jabiru 2200 (now flying)

 	  Quote: 	
		  From: Lynn Matteson <lynnmatt(at)jps.net>

Reply-To: kitfox-list(at)matronics.com

To: kitfox-list(at)matronics.com

Subject: Re: Leading Edge Spar Retaining Pin Date: Fri, 24 Aug 

2007 15:56:33 -0400






You're welcome, John.



I was gonna add this part earlier, but figured you didn't need  another 

thing to worry about. Now that you've got a few hours older  (joke), I 

think you can handle it.  In Spruce's description of the  clevis pins, it 

says:  "Used with clevis forks and in secondary  controls which are not 

subjected to continuous operation."   Makes  you wonder, doesn't it? 



Lynn Matteson

Grass Lake, Michigan

Kitfox IV Speedster  w/Jabiru 2200

flying w/395+ hrs

do not archive

On Aug 24, 2007, at 10:42 AM, John W. Hart wrote:



>

>

>Thanks Lynn.  I have a Model IV also, and I was pretty sure I had  the 

>right

>critter, but I don't like guessing when it comes to parts as  critical as

>these.  I bought the aircraft already built, and have a lot of the

>paperwork, but couldn't locate anything telling me EXACTLY what the  pin 

>is.

>I appreciate the help.

>John Hart

>




	


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klschooley(at)hotmail.com
Guest

Posted: Sat Aug 25, 2007 12:30 pm Post subject: Leading Edge Spar Retaining Pin

Just a quick note regarding the wing retaining pins, I was told as an Avid 

Flyer salesman. That there is practically NO shear on these pins. Because of 

the location of the wing lift struts at the lower pivot point, the pin has 

approx. 18 lbs. forward load at nominal cruise (there is virtually no 

rearward load). The reason for the size of this pin is for pilot confidence, 

not necessarily for strength. The most loading will occur during landing 

configuration or ground movement.



                                                                             

      Thanks, Ken

[quote]From: "Noel Loveys" <noelloveys(at)yahoo.ca>

Reply-To: kitfox-list(at)matronics.com

To: <kitfox-list(at)matronics.com>

Subject: RE: Leading Edge Spar Retaining Pin Date: Fri, 24 Aug 

2007 22:37:42 -0230



That's because clevis pins are usually used in moving shear applications

e.g. axels for pulleys.  The application on the 'Fox and the Avid is a

static shear application.  Because I fold my wings after every flight I 

keep

an eye peeled on the condition of the clevis pin and if it ever gets to the

point where the cad plate is worn through I'll replace them.



Noel Loveys, RPP, AME intern

Campbellton, Newfoundland,

Canada

Kitfox Mod III-A, 582, B box, Ivo IFA

Aerocet 1100s

  <mailto:noelloveys(at)yahoo.ca> noelloveys(at)yahoo.ca

Do not archive



 > --

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Sat Aug 25, 2007 4:33 pm Post subject: Leading Edge Spar Retaining Pin

The operative word there I think is, "practically" .  The only load at all

is shear but you are right that is minimal.  No doubt the clevis pin could

be a lot smaller and still do the job.   For the reason you give, pilot

confidence, if the cad plating ever wears off my pins I'll replace them.



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

hflynn46531(at)yahoo.com
Guest

Posted: Sun Aug 26, 2007 3:24 am Post subject: Leading Edge Spar Retaining Pin

When building my S5 in 1996 I talked to the tec. department at skystar about the forward wing spar bolts. They told me that the wings had a forward lifting force on them and in theory in level flight the bolts could be removed and the wings would remain in place. How about that!!!



Noel Loveys <noelloveys(at)yahoo.ca> wrote:  [quote]--> Kitfox-List message posted by: "Noel Loveys" 



The operative word there I think is, "practically" . The only load at all

is shear but you are right that is minimal. No doubt the clevis pin could

be a lot smaller and still do the job. For the reason you give, pilot

confidence, if the cad plating ever wears off my pins I'll replace them.



Noel



[quote] --

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Sun Aug 26, 2007 6:10 am Post subject: Leading Edge Spar Retaining Pin

I don't disbelieve it,  especially if the air velocity over the wing is constant.  I'm not  going to try it...U first!! 

  

 Noel

 [quote]   

   --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

akanka(at)kiamichiwb.org
Guest

Posted: Sun Aug 26, 2007 12:14 pm Post subject: Leading Edge Spar Retaining Pin

I  don't think I want to personally test that theory!   ;<)

 John  Hart

  

 [quote]   --

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