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Tail Plane Fitting

 
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graeme.hart(at)onecoolkat
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PostPosted: Mon Jun 05, 2017 7:55 am    Post subject: Tail Plane Fitting Reply with quote

Thanks for the tips everyone.

I ended up buying a selection of pipes from Aircraft Spruce with approx the right inside diameter.  One of the pipes was a pretty good fit.
I now have the right side tailplane fitting quite well, the front pin is fully engaged and the back pin is about 2mm (approx 5/64" or .0787") from being fully engaged.
The left side tailplane is not quite there yet, I have approx 2mm (approx 5/64") gap from the pin being fully engaged at the front and 5mm (approx 13/64" or 0.1969"at the back.
As far as I can tell all four pins are very close to parallel with the torque tube.
I believe the problem with the right side tailplane to be the position of the bushing.  I'm not sure which of the two bushings to move but I expect one of them is in the wrong place.
The left side is a bit more complex, I can't see anything stopping the pin from fully engaging.  My next step is going to be to measure inside the tailplane to see if the torque tube is hitting something inside the tailplane.  The pip pin holes have not yet been drilled so I can't use that as a guide.
Any suggestions or critique of the above thoughts would be most welcome.  I've wasted enough time procrastinating over the tailplane fit, I want to get them installed and move on.
On Mon, May 15, 2017 at 12:06 AM, h&amp;jeuropa <butcher43(at)att.net (butcher43(at)att.net)> wrote:
Quote:
--> Europa-List message posted by: "h&amp;jeuropa" <butcher43(at)att.net (butcher43(at)att.net)>

We seem to recall we had to "adjust" the pins to make our tail planes fit properly too.  You can probably use a 1/4" drive deep well socket to slide over the pin and adjust it.

We also found that lubrication is necessary.  We use anti seize compound on the torque tube itself and the pins.  This is especially necessary once in service since it is possible for moisture to weep past the pip pin and cause corrosion at the bearing inside the tailplane.  We wipe a little anti seize on a stick to reach that bearing prior to installing the tailplanes.

Jim & Heather




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graemeh



Joined: 15 Jun 2017
Posts: 17

PostPosted: Wed Jun 21, 2017 2:12 am    Post subject: Re: Tail Plane Fitting Reply with quote

My last update (quoted below) seems to have updated on the website but didn't seem to email out. I will do this update via the website to see if that is more reliable.

I've made further progress and now I have both tailplanes fitting quite well, the front pin is almost fully engaged (about 0.5mm or 0.02" to go) and the back pin is about 2mm (approx 5/64" or .0787") from being fully engaged.

Any further suggestions or advice on how to sort out the discrepancy between the front and back pins would be greatly appreciated.

As a side note, I've discovered that 9.5 degrees C or 49 degrees F is ideal for fitting the metal parts together. It is proving much easier to install and remove the torque tube now than in warmer weather.

graeme.hart(at)onecoolkat wrote:
Thanks for the tips everyone.

I ended up buying a selection of pipes from Aircraft Spruce with approx the right inside diameter.  One of the pipes was a pretty good fit.

I now have the right side tailplane fitting quite well, the front pin is fully engaged and the back pin is about 2mm (approx 5/64" or .0787") from being fully engaged.

The left side tailplane is not quite there yet, I have approx 2mm (approx 5/64") gap from the pin being fully engaged at the front and 5mm (approx 13/64" or 0.1969"at the back.

As far as I can tell all four pins are very close to parallel with the torque tube.

I believe the problem with the right side tailplane to be the position of the bushing.  I'm not sure which of the two bushings to move but I expect one of them is in the wrong place.

The left side is a bit more complex, I can't see anything stopping the pin from fully engaging.  My next step is going to be to measure inside the tailplane to see if the torque tube is hitting something inside the tailplane.  The pip pin holes have not yet been drilled so I can't use that as a guide.

Any suggestions or critique of the above thoughts would be most welcome.  I've wasted enough time procrastinating over the tailplane fit, I want to get them installed and move on.


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