section 58-02 yaw servo install question, before big join

[lipper03]

I'm looking at section 36, 56, and 58 to do the servo bracket installs while I have the tailcone free before the big join. When I rivet the yaw servo mount (F-14189A/B) to each other and F-01407-L/R, will I be able to remove the bellcrank plate (F-14139)? I'm wondering if others can let me know if that's true, because I'd like to just do the servo bracket installs, but not all the hardware and the actual bellcrank at this point. From what I can tell with the nut plates, F-14139 is removable otherwise. It looks like the F-14139 could slide forward from under F-1489A and come out to work on later, but I don't want to get myself into a bind and not be able to do that.

If anyone has done this, or has removed the bellcrank mount at a later point, or has any suggestions, please let me know.

 

[mc607]

Unrelated but noteworthy. When installing my GSA28 servo, as per the plans, I noticed the forward jam nut would rub on the bell crank assembly. If left like that it would have cut in to the bell crank assembly. I flipped the washers and put the .063 washer between the rod end bearing and the bell crank assembly. Problem solved. YMMV

 

[lipper03]

Unrelated but noteworthy. When installing my GSA28 servo, as per the plans, I noticed the forward jam nut would rub on the bell crank assembly. If left like that it would have cut in to the bell crank assembly. I flipped the washers and put the .063 washer between the rod end bearing and the bell crank assembly. Problem solved. YMMV
View attachment 71662

Thanks for the tip, I'll watch for that.

 

[Phil Sprang]

I would recommend that you install F14189B with a mechanical fastener instead of rivets.

I installed it prior to the "big join" and I had to remove it later as I was unable it install the elevator pushrod.

 

[lipper03]

I would recommend that you install F14189B with a mechanical fastener instead of rivets.

I installed it prior to the "big join" and I had to remove it later as I was unable it install the elevator pushrod.

So you could not pull out F14139 later, what kept it from coming out?

Did you put it back with bolts? Did you go with an AN3 or something smaller? I haven't looked at edge clearance for that switch yet.

 

[Halleffect]

I'm looking at section 36, 56, and 58 to do the servo bracket installs while I have the tailcone free before the big join. When I rivet the yaw servo mount (F-14189A/B) to each other and F-01407-L/R, will I be able to remove the bellcrank plate (F-14139)? I'm wondering if others can let me know if that's true, because I'd like to just do the servo bracket installs, but not all the hardware and the actual bellcrank at this point. From what I can tell with the nut plates, F-14139 is removable otherwise. It looks like the F-14139 could slide forward from under F-1489A and come out to work on later, but I don't want to get myself into a bind and not be able to do that.

If anyone has done this, or has removed the bellcrank mount at a later point, or has any suggestions, please let me know.

View attachment 71644

I did it before the big join like you're considering. Yes, the bellcrank plate can be unbolted to install the elevator pushrod. The elevator pushrod is a tight fit past the yaw servo bracket, but it will go.

 

[lipper03]

I did it before the big join like you're considering. Yes, the bellcrank plate can be unbolted to install the elevator pushrod. The elevator pushrod is a tight fit past the yaw servo bracket, but it will go.

Mark, thanks! I did a test fit this afternoon, and I think there needs to be a spacer between 14189A and B. Without 14139 there, 14189A sits right on the bellcrank angles and 14189B is flush to the 01407L/R, but with 14139 there it's too tight, both at 14139 and not flush at 01407L/R, so I'm considering adding a 0.065" spacer. I've emailed Vans to see what they think as well. Much appreciated feedback!

 

[lipper03]

So you could not pull out F14139 later, what kept it from coming out?

Did you put it back with bolts? Did you go with an AN3 or something smaller? I haven't looked at edge clearance for that switch yet.

An AN3 does not have edge clearance, it looks like a #8 screw would. Maybe a AN525-832R7 or 8?

 

[lipper03]

To follow up with what I got from Vans:
1. Should be able to pull out from underneath.
2. If wanted to make removable, could install nut plates K1000-08 on 14189B or the bulkhead and use #8 screws
3. On the spacer question, there could be enough flex to make it work, but can make a shim if needed.

My current plan is to try the shim with some scrap material left over, as I think that will allow the pull out easier later, and not have to install nut plates.

I will take a look at nut plate placement, and comment back to this thread for those thinking at doing it that way.

 

[lipper03]

I built a shim of 0.063" 2024-T3, and upped the rivet to a 3-5.5 from a 3-4.5. The test fit was perfect, everything aligned, and there was space to pull the 0.063" 2024-T3 F-14139 out. So this is what I'm going to install.

On the nut plate option, I'm not really sure placement, I was trying to place on both sides, and it just didn't seem any better then the shim, and way harder. So sticking with the 0.063" shim.

 

[dan.gagnon85]

assuming you are past this point now.. were you able to get the elevator crank and push rod in with the yaw servo mount plate in place?

 

[lipper03]

assuming you are past this point now.. were you able to get the elevator crank and push rod in with the yaw servo mount plate in place?

Haven’t done that yet, doing avionics before big join at the moment.

 

[lipper03]

FYI I’m building the pushrod so I can put it in before big join, as someone else said they couldn’t get it in with the yaw servo mount height in the way.

 

[joer308]

FYI I’m building the pushrod so I can put it in before big join, as someone else said they couldn’t get it in with the yaw servo mount height in the way.

Which pushrod is the issue? I want to do the same thing, and have looked at the plans several times, and am not sure where the issue is? The forward or aft pushrod? Why is removal of the F-1439 necessary? I was going to have the elevator bell crank already installed in the 2 brackets (F-1037A)..

 

[lipper03]

Which pushrod is the issue? I want to do the same thing, and have looked at the plans several times, and am not sure where the issue is? The forward or aft pushrod? Why is removal of the F-1439 necessary? I was going to have the elevator bell crank already installed in the 2 brackets..

The middle one, CS-00002. The yaw servo mount (F-14189A) is too tall to slide CS2 in after the join from many reports. If I'm reading your post correctly, you want the crank in already as well, which from my understanding you won't have clearance to get CS-00002 in without taking the bell crank out, and this issue of F-1489A as well if you have that already mounted too.

 

[lipper03]

I went out and took a photo, the issue is you can't get CS-00002 through the bulkhead hole and the F-14189A because F-14189A is too tall, without it, CS-00002 just fits sliding in from the aft. It doesn't fit trying to slide from the front into the aft.

And you can imagine if the bell crank was installed, it just makes things worse, as it's totally in the way to slide in from the aft.

Hopefully this clears things up.

 

[BigBadBob]

I went out and took a photo, the issue is you can't get CS-00002 through the bulkhead hole and the F-1489A because F-1489A is too tall, without it, CS-00002 just fits sliding in from the aft. It doesn't fit trying to slide from the front into the aft.

And you can imagine if the bell crank was installed, it just makes things worse, as it's totally in the way to slide in from the aft.

Hopefully this clears things up.

View attachment 86072

View attachment 86077

I think you mean F-14189A in the above?

 

[lipper03]

I think you mean F-14189A in the above?

Yep, changed, thanks for the catch!

 

[BigBadBob]

So, this means that CS-00002 can't be serviced/replaced once the plane has been build (if you have the yaw servo bracket) right? That's not great.

I assume that removing the rod ends doesn't help.

 

[lipper03]

So, this means that CS-00002 can't be serviced/replaced once the plane has been build (if you have the yaw servo bracket) right? That's not great.

I assume that removing the rod ends doesn't help.

Yes, but if you’re replacing a pushrod, my guess is taking the yaw servo mount off is not the limiting factor in the repair.