Backcountry Pilot • Cessna 180 Jackscrew & SEL-55-01

Cessna 180 Jackscrew & SEL-55-01

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Re: Cessna 180 Jackscrew & SEL-55-01

I think the new spacers were a little longer than the bushing which looked like it would prevent wear so long as you replace them every 500hr or so. I was considering washers but the ia working with me was unwaivering about installing the exact hardware called out in the ipc.

I also believe that someone has stc'd a better solution and I believe they posted on this site somewhere. From what I remember it fixed the wear issue among other improvements.
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Re: Cessna 180 Jackscrew & SEL-55-01

I have the very early style of horizonal that has the two flush screws in the rear holding the aluminum hinge brackets. The front corners each have two rivets instead of a single flush screw. Also, on the inside of the center part, I have no reinforcement brackets that the single forward flush screws go through. It's been a long time since I replaced the steel spacer bushings that are sandwiched between the hockey stick and the inner bracket, but I don't remember any bearing pressed into the aluminum bracket. Just the bracket that can wear, pivoting on the steel bushing. The horizontal could slide side to side so I made some plastic washers to take up the space on the outer side of each aluminum hinge casting.I have a 182 horizontal that was crunched on one side that I should get repaired and updated to the newer version. I have all the spars that are needed.
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Re: Cessna 180 Jackscrew & SEL-55-01

Where is the rotation meant to occur?

Between the bolt and the metal spacer.

Or between the spacer and nylon bushing.

I thought the later, in which case you could make sure that spacer is tight or protected by a washer to stop the chewout of the hockey stick.
But I've been wrong before.

Anyone else with leads on the STC'd mod?
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Re: Cessna 180 Jackscrew & SEL-55-01

Tex wrote:Where is the rotation meant to occur?

Between the bolt and the metal spacer.

Or between the spacer and nylon bushing.

I thought the later, in which case you could make sure that spacer is tight or protected by a washer to stop the chewout of the hockey stick.
But I've been wrong before.

Anyone else with leads on the STC'd mod?
Are you talking about Joe Dorys STC to fix the broken hinge issue? Image
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Re: Cessna 180 Jackscrew & SEL-55-01

Can the hockey puck be spliced a little ahead of the crack to save replacing the whole thing? There is some pretty thick metal back in that area

Remember my post back in May of 2018 in this thread. Looks like Joe Dory made it happen which seemed very doable to me.
And to Tex. The steel bushing is supposed to be solid. On mine there is no nylon for sure and I don't think I have a bearing either in the aluminun hinge bracket casting.
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Re: Cessna 180 Jackscrew & SEL-55-01

Saw those things at Alaska Airmen's Show a few months ago and was very impressed with what Acme did. Talking to Joe was also a treat as you could he he personally had been affected by the problem so he knew it well.
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Re: Cessna 180 Jackscrew & SEL-55-01

hotrod180 wrote:
Brian-StevesAircraft wrote:….Just had the tail off a 185 recently to address some serious looseness in the horizontal stab... Turned out to be worn out hinge bushings... Bought a whole set from F. Atlee Dodge for just over $230....

However my early C180 IPC shows NAS296-4A needle bearings at that location.....


Turns out I wasn't looking close enough at the IPC--
the needle bearings I referred to are located at what the IPC calls the "stabilizer hinge",
but it's actually at the elevator hinges which are mounted on the stabilizer.
The actual stab hinge shows spacer p/n 0732101-7 as sold by Atlee Dodge.
It doesn't show the bushing p/n 0760679-2 that goes with it,
but I'm sure it's all the same as the later models, as IPC says "all models 180".

FWIW that hockey-stick replacement that Joe Dory got approval for looks awesome!
Good news, for sure.
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Re: Cessna 180 Jackscrew & SEL-55-01

Alright. I've never been one not to ask the dumb questions.

Where do you source the rubber that goes around the bottom of the fin before I put it back on?

And the mouldings at the rear of the fuselage that move up and down, as the stab moves up and down, do you line it with a contact to prevent wear?
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Re: Cessna 180 Jackscrew & SEL-55-01

https://www.aircraftspruce.com/catalog/ ... hannel.php



Tex wrote:Alright. I've never been one not to ask the dumb questions.

Where do you source the rubber that goes around the bottom of the fin before I put it back on?

And the mouldings at the rear of the fuselage that move up and down, as the stab moves up and down, do you line it with a contact to prevent wear?
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Re: Cessna 180 Jackscrew & SEL-55-01

https://www.aircraftspruce.com/catalog/ ... fetape.php

I have some tape similar to this that reduces the chafing.
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Re: Cessna 180 Jackscrew & SEL-55-01

Thanks Eddy and Pinecone.

The questions are often a result of doing lots of this ground work on the run out of motels and therefore not having a real aircraft and rule at hand. (who remembers those days?) When I get home for a few days there's teenage homework to sort, lawns to mow and hopefully I can fit in a few hours aircraft reno work.

Appreciate the replies.
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Re: Cessna 180 Jackscrew & SEL-55-01

I'm going to have my mechanic complete this inspection at the next annual inspection. A couple of questions:

1. I have a buddy with an early model 182 who says he did the inspection without removing the horizontal. He says he has an extra inspection plate somewhere and he thinks this is why he was able to do it with just a borescope and cursing. I don't see how it can be done without removing the tail feathers. Am I wrong?

2. There is a repair kit available from Bill Duncan, previously of Alaska Bushweels. https://www.cessnarepairs.com/
Is this the same as the Joe Dory kit mentioned above or are there now two options for repair kits?

Edit: I think I just answered my 2nd question for myself ... I see they have the same email address. [email protected]
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Re: Cessna 180 Jackscrew & SEL-55-01

I did my '57 without removing the vertical. Yes, I used a boroscope. It was not difficult. I think Joe invented the repair and the other guy is manufacturing the kit, but not 100% sure.
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Re: Cessna 180 Jackscrew & SEL-55-01

kg wrote:I'm going to have my mechanic complete this inspection at the next annual inspection. A couple of questions:

1. I have a buddy with an early model 182 who says he did the inspection without removing the horizontal. He says he has an extra inspection plate somewhere and he thinks this is why he was able to do it with just a borescope and cursing. I don't see how it can be done without removing the tail feathers. Am I wrong?


I think that undertaking this inspection without disassembling the tail may be false economy. My buddy and I both own 1973 C180J's, each with 5,000+ hours TTAF; his all on wheels, mine 50/50 wheels/floats. Using the same A&P we took each tail completely apart. Mine received a clean bill of health, but my buddy's had a crack in one stabilizer hinge, visible only after we cleaned the area thoroughly, as well as a missing rivet in a reinforcing flange. Neither of these would have been visible with a borescope inspection.

As noted by others above, this was a great opportunity to undertake additional maintenance of hard to reach items, including servicing the jack screws and trim system, replacing the jack screw boots, inspecting/cleaning and lubricating all of the stabilizer bushings, replacing the stinger bushings, etc. We both considered the efforts worthwhile.
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Re: Cessna 180 Jackscrew & SEL-55-01

Windknot54 wrote:
As noted by others above, this was a great opportunity to undertake additional maintenance of hard to reach items, including servicing the jack screws and trim system, replacing the jack screw boots, inspecting/cleaning and lubricating all of the stabilizer bushings, replacing the stinger bushings, etc. We both considered the efforts worthwhile.


Thanks. That is my thought as well. I would like to know that all the bits and pieces are in good shape.
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Re: Cessna 180 Jackscrew & SEL-55-01

Thank you all for a most wonderful thread on an area of out planes that is a problem.
I don't mean to cause thread creep but thought this might be thread to ask a question that has been bugging me both with my current plane and a 59 180 I had years ago.

I have a 73 185 that had been ground looped some 5 years before I bought it 4 years ago. The right wing and tail area were affected.
Upon inspection of the tail area with the vertical fin off.my mechanic was surprised to see many new parts and fittings. All looked in excellent shape. He re greased the jackscrews and found them on good shape.
I had hoped the trim issue would have been better but its not. It is still hard to trim any way past the yellow arc. I have added weight to the baggage area but it doesn't seem to help much. It seems more like an aerodynamic issue not a mechanical one.
Just wondering if anyone has found after an tail rebuild if the nose down trim issue is been reduced.
It just seems had to understand how Cessna could certify an airplane that one cannot trip up to the redline.
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Re: Cessna 180 Jackscrew & SEL-55-01

I've found neutral or a little opposite input of the elevator from what you're trying for makes the jackscrews turn easily. I assume you can get full travel when sitting on the ground.
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Re: Cessna 180 Jackscrew & SEL-55-01

a3holerman wrote:Thank you all for a most wonderful thread on an area of out planes that is a problem.
I don't mean to cause thread creep but thought this might be thread to ask a question that has been bugging me both with my current plane and a 59 180 I had years ago.

I have a 73 185 that had been ground looped some 5 years before I bought it 4 years ago. The right wing and tail area were affected.
Upon inspection of the tail area with the vertical fin off.my mechanic was surprised to see many new parts and fittings. All looked in excellent shape. He re greased the jackscrews and found them on good shape.
I had hoped the trim issue would have been better but its not. It is still hard to trim any way past the yellow arc. I have added weight to the baggage area but it doesn't seem to help much. It seems more like an aerodynamic issue not a mechanical one.
Just wondering if anyone has found after an tail rebuild if the nose down trim issue is been reduced.
It just seems had to understand how Cessna could certify an airplane that one cannot trip up to the redline.


I think that is just the nature of trimming the stabilizer. It's the same in big airplanes. At high speeds manual trimming is difficult, even below redline.

My friend with the 182 doesn't like the stabilizer trim. He doesn't think the gain in efficiency outweighs the difficulty in trimming and the complexity of the system. He prefers a trim tab.
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Re: Cessna 180 Jackscrew & SEL-55-01

. I have a buddy with an early model 182 who says he did the inspection without removing the horizontal. He says he has an extra inspection plate somewhere and he thinks this is why he was able to do it with just a borescope and cursing. I don't see how it can be done without removing the tail feathers. Am I wrong?


I read your removing the tail and I think that's the only way to inspect this area. Not that I'd know as I'm only half way through doing this for the first time.

I can see how you could determine there were no cracks with the borescope, but I chose to do the Joe Dory STC for wear, not cracking, and this would only be detected with the stab off.

In my case the steel bushings in the rear stab hinge had worn at least 1/3 of the thickness of the hockey stick end.

I'm glad I've done this although with the strong USD it was not a cheap exercise. Thanks to Joe for the solution.
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Re: Cessna 180 Jackscrew & SEL-55-01

Yes the trim is effortless one end to the other when on the ground.
I have used the opposite elevator and it helps somewhat.

My question is how did it get certified it one cannot trim it to near the redline?
The trim cable tension is set to near max yet it will not stay in position much past the green ace on the high end.
I have been told the 185 needs weight in the tail which does help on landing but seems to make the trim issue worse.
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