Grob 103 Spoiler Mechanism Removal?

[George Haeh]

We are refurbishing and have the spoilers off, but so far have not seen a way to remove the arms and pushrods.

Any hints or special tools?

[krasw]

sunnuntai 6. tammikuuta 2019 6.29.34 UTC+2 George Haeh kirjoitti:
> We are refurbishing and have the spoilers off, but so far have not seen a way to remove the arms and pushrods.
>
> Any hints or special tools?

Don't know about Grob but in all cases I'm aware of airbrake linkages and bearings are installed before closing the wing. This means that you need a hole saw to change parts.

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Don’t remove the pushrods, unless you must. The guides have a sliding sleeve with little plastic balls, when the pushrod is pulled out,one hears rattle, rattle, tink, tink..........as the balls fall out inside the wing! Inspect the spoiler plates, pivot bushings and bolts in place and if all looks good, lube and walk away. Pull up on the caps to check the springs, then close and lock to check for nothing sticking up.
Hope this helps,
JJ

[Scott Williams]

On Sunday, January 6, 2019 at 9:06:11 AM UTC-6, wrote:
> Don’t remove the pushrods, unless you must. The guides have a sliding sleeve with little plastic balls, when the pushrod is pulled out,one hears rattle, rattle, tink, tink..........as the balls fall out inside the wing! Inspect the spoiler plates, pivot bushings and bolts in place and if all looks good, lube and walk away. Pull up on the caps to check the springs, then close and lock to check for nothing sticking up.
> Hope this helps,
> JJ

select Grob 103 serial numbers have a reoccurring inspection of the spoiler bellcranks for cracks. there is a access hatch modification to get to them to repair/replace. you might check http://www.ltb-lindner.com/ for more information.
good luck,
Scott

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Our 103 had a bent spoiler rod - it sticks out beyond the wing root and is either a convenient handhold or easily caught on the fuselage and bent. We opted to replace the rod, to undo bolts in the wing it was necessary to open up the wing. Previous comments about things being in place before wing buttoned up are true! We just installed the inspection ports behind the spar vicinity of the overcenter lock. Removing the spoilers mechanism would entail lots of openings on both sides of spar! You may want to reconsider! Did not encounter any linear bearings that fell out, only a sleeve in the wing root, and many small abrasions from putting hand through supplied opening that is sized for children! Check with Robert Mudd in Moriarty, US contact - he was very helpful. Likewise, Lindner has plenty of tech bulletins to read that may provide insight.
Mark

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I'm curious as to why you want to remove the pushrods?
I've had to replace some of the teflon balls in the pushrod guides in the past. The balls had flat spots and caused noise in the wing as the tubes moved across them. It did require adding access thru the bottom of the wing.

[George Haeh]

We wanted to clean up and relube.

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I've got a few pictures of the pushrod guides with roller balls if anyone would like to see how they are designed. The balls are caged and should not fall out, unless the cage or balls are worn to much, or the stop rivets are missing from the outer tube.
To bad we can't post pics here.

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Here is a link to a few pics of these aileron pushrod guides in the wing.
A good look at the crank that requires inspection by AD is also included.

Hope this works?

https://imgur.com/a/0ehbx2R

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Well, I have to apologize for the junk below the pictures. I didnt realize that was there.

Sorry.

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There are 3 individual pushrods in each wing that actuate the spoilers.
There are no balls and guides on the spoiler pushrods as they are not real long.

There are three pedestals with guides and roller balls in each wing for the aileron pushrod.