Tailwheel failure

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drjeff
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Tailwheel failure

Post by drjeff »

Tail spring broke on landing roll out...... A relatively new Chief owner at our airport experienced a tailwheel failure a couple of weeks ago and I thought I'd share some pictures with the board. Below is a summary of what happened and the pictures that tell the rest of the story.

This is from an email we shared today:

I think it would be a great idea to post pics and a note as to what happened durring this incident. I would hate for anyone else to experience what I went through. It was not fun. There is nothing worse than being out of control of your aircraft. Its a really bad feeling. I made a nice soft 3 point touchdown right on the centerline. I didn't feel anything abnormal or hear any strange noises. About 20ft after touchdown, power off, the plane just started to steer to the right. I went to hit the left brake and rudder pedal to counter the drift, and the pedal was LOCKED. There was no movement, like it was welded. Thats when things started to happen fast. I told Richard right as it was happening over the intercom. As the plane started to get sideways on the runway, I put in hard right aleron to keep the wing from dipping. As it skidded off the runway, missing the runway light by about 20ft, it spun around on the left main gear as it went down the embankment and settled tail first into the drainage ditch. That is where the elevator got bent. I believe that due to the lack of control on the runway, that the tailwheel spring gave out just after landing, and pulled the tailwheel assembly completely off and kicked out to the right, bending my lower rudder, and locking me in a permanent hard right steer. The break point of the tailwheel spring would have never been noticed durring an "on the plane" inspection because the break point was under the retaining bracket at the bottom of the vertical stabilizer, completely covered. The sad thing is that we did a pretty thourogh annual on this plane just a couple months ago. I never would have thought to remove the spring for inspection. If we did, this whole incident would have been avoided.
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skyking3286
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Re: Tailwheel failure

Post by skyking3286 »

Get a good IA... you can split the fabric, cold pull the tubing straight....it's really not that bad and I don't see the
tailpost or fuselage bent or fabric wrinkled. At least you can pull the rudder and elevators and bring them home to work on
so it should be quickly in the air again. Just put the hands on the project each night and it will be a quick trip back into
the air. You could in theory, fix it before a new leaf spring arrives via regular shipping.
Mark Peterson
Harvey Field, WA
A copy of my old Chief website is preserved here:

http://www.reocities.com/mrpeters.geo/index.html
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joea
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Re: Tailwheel failure

Post by joea »

Agree with Mark, while it looks difficult, this is not that bad and you can have it back in the air shortly.

I have to tell you that I had almost the same thing happen to me years ago on my Chief. Flew it from WY to AZ with several landings along the way. Last landing at home airport the spring to tailwheel connection broke and left me with little control. Went off of the runway but was ok with no ditches at my airport. Turns out it was the rudder horn that had worn through and let go.

Joe A
N86250
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Re: Tailwheel failure

Post by N86250 »

I also had a somewhat similar experience. The bolt attaching the tailwheel to the spring was too long and bottomed the threads before it clamped things tight. On landing on pavement the looseness allowed the tailwheel to shimmy violently and throw off its steering springs. We spun 270 and off the runway backwards too. No damage to the tail but the right wing touched the grass what seemed ever so softly. A close look revealed it cracked the rear spar at the tip bow. jrh
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Tim Juhl
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Re: Tailwheel failure

Post by Tim Juhl »

Can't say for sure but better brakes might have saved the day. The hydraulic clevelands I put on my Champ under STC give me a lot more control than the old goodyears ever did.

Unfortunately, I don't know if there is such an option for the Chief.

Tim
CFII
Champ 81L
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joea
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Re: Tailwheel failure

Post by joea »

Tim,

There is. John Rodkey of the fAA list has Hyd brakes on his Chief.

Have also seen them on a Chief out of El Paso.

Joe A
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NC86036
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Re: Tailwheel failure

Post by NC86036 »

Hello! I finally got around to registering on this site. The plane is still down. I sent the control surfaces down to Panama City,Fl where my father in law and his local EAA chapter offered to do the repair. Due to a series of setbacks, they are still not complete. The elevator is complete, and ready to coat, but the rudder still needs the envelope installed. My father in law is sending them back up to me this week so I can expidite the rest of the repair. I have the Polyfiber paint system ready to go. I plan to start on them this week when they arrive. I installed a new tailwheel spring and have a new set of compression springs. I noticed that my tailwheel and spring are leaning a bit to the right (bottom kicked out to the left). after looking closer it seems that my bracket at the bottom of the vert. stab. is slightly bent in that same direction. see above pics. Should i attempt to straighten it, or use a shim?
Robert Wiehl

46 11AC CHIEF NC86036
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joea
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Re: Tailwheel failure

Post by joea »

Robert,

Welcome on board!

I would get an A&P involved on the project (if you are not one) and find out why something is not level back there first.

Joe A
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NC86036
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Re: Tailwheel failure

Post by NC86036 »

Joe,

I'll have an A&P look at it before I do anything. I'm still very new aircraft ownership, and still have less than 100hrs total time logged. Still working on my tailwheel endorsement as a matter of fact. So any and all advise will always be appreciated. Does an A&P have to sign off the repair work? If so, at what stages?
Robert Wiehl

46 11AC CHIEF NC86036
MikeB
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Re: Tailwheel failure

Post by MikeB »

Robert,
Definitly get a AP/IA involved. That spot at the tailwheel post and tubing just forward of it tends to collect water and rust. There should be a inspection panel that can be opened in that area and/or it's possible to open the fabric somewhat to check things out. Especially if you plan to cold bend the spring attach point. I wouldn't shim...might as well do it right. These tailwheel aircraft are touchy enough without adding another demension into the picture.

MikeB
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NC86036
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Re: Tailwheel failure

Post by NC86036 »

That is one of the first things I did was pull the inspection cover. I shined a light dow in there, and I could not see any visible rust. There is however a couple bulges in the lower longerons where it looks like a weld repair was done. Those bulges go the complete circumference of the tubes, and are solid. Everything is zinc chromated and smooth and clean. I cant see the areas the fabric is attached to at the very bottomof the lower tubes, so that I am not sure of. This plane has some damage history, but it was re covered in polyfiber back in 1989. As far as I can tell, this damage at the tailspring bracket is old, and just was not repaired correctly. This misalignment issue is probably one of the reasons the plane has been a handfull on pavement. That coupled with an obvious bad leaf spring and improperly setup steer springs. It was always fine on grass though. I wanttomake sure it is 100% right before the next flight. I will contact my local AI at my airport hopefully this week and see what he thinks. He witnessed the accident and helped me get the plane towed back to the hangar. He gave me his card and told me to see him if I needed anything. It's time to take him up on that.
Robert Wiehl

46 11AC CHIEF NC86036
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joea
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Re: Tailwheel failure

Post by joea »

Robert,

Like Mike said, get an A&P/IA involved now and then when its ready to return to service there will not be any surprises.

Joe
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NC86036
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Re: Tailwheel failure

Post by NC86036 »

Well, I found a couple problems. When I put the spring on originally, I forgot to add the rubber between the spring and bracket, which cause the surrounding bracket to bottom out before completely tightening the spring against the main support under the vertical stabilizer. That allowed the spring to lean to one side. That coupled with the fact that the bolts I used were slightly too long and needed a couple washers to keep from bottoming the nut out on the shank. I took some photos of the inside of the fuselage as well, and it looks very clean, no rust issues to be found. I will still obviously get an AI to go over the plane. Cant seem to find where to add pics to this post, can someone help?
Robert Wiehl

46 11AC CHIEF NC86036
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joea
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Re: Tailwheel failure

Post by joea »

Photo posting 101:

http://www.joea.com/phpBB2/viewtopic.php?f=1&t=604

Glad that you found the issue. These old birds are not real complicated but need some things done right or its a handful.

Joe
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NC86036
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Re: Tailwheel failure

Post by NC86036 »

Here goes my first picture upload attempt.
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Robert Wiehl

46 11AC CHIEF NC86036
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