Graham,
When I was reading how the holes must be drilled through the TP6 and TP4 for
the pip pins on the bench with a friend looking at 90 for correct position,
I knew that it was practically impossible to ream the burrs at the
underside. At the same time drilling first through SS TP6 with a cobalt
drill means that you need directly to apply a certain force to have grip
otherwise the drill would slide. This would result in all but perfect
straight pip pins in all but perfect holes. So, before laying up the cloth
on the tailplanes my holes were drilled and reamed. The recesses of 3 x bid
were made and floxed to the rib, the TP6 and the foam. Even small pipes were
glued at the underside to drain eventual captured water before the final lay
ups. Didn't you have the impression of bad amaturisme when executing
following the manuel?
Best regards,
Karel Vranken # 447 F-PKRL
----- Original Message -----
From: "Graham Singleton" <grahamsingleton@btinternet.com>
Sent: Friday, June 29, 2007 12:41 AM
Subject: Re: Europa-List: Tailplane Recess
> <grahamsingleton@btinternet.com>
>
> Tim
> Is it really cold in Christchurch? Cold in UK right now! I reckon all the
> 747 vapour trails are reflecting heat out and helping to cool the planet!
>
> I admit to trying to guess what Andy is thinking but my understanding is
> that the object of the proposed exercise is to prevent the pip pin from
> pulling through the tailplane structure and uncoupling the drive pins.
> This is just a back up in case of failure of the TP6 bush bonding.
>
> I was puzzled by the insistence on a "Minimum" area of BID lay up fore and
> aft. However this will be more difficult to pull through the foam core (
> and the skin) than the cylindrical structure many of us have built. The
> PFA amendment also insists on a flox corner with the skin, no doubt for
> the same reason.
> Open to correction?
> Any comment Nev?
> Graham
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