Graham,
Reading between the lines (and therefore subject to the proviso that my
reading may be wrong), I interpret the directive as being about the ability
of the layup in the hole to bond to the bush, not about the effect on the
strength of the stabilator skin.
I will refrain from inferring from the directives the direction of the AAIB
investigation, although I suspect it is clear to many of us.
Regards,
Jeremy
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Graham
Singleton
Sent: 20 June 2007 22:43
Subject: Re: Europa-List: RE: EUROPA PIP-PIN RECESS
<grahamsingleton@btinternet.com>
Carl
I moght be wrong but I would not have grounded you. The smaller the
circumference the stronger the hole surround?
Graham
Carl Pattinson wrote:
> Well, this really puts the cat amongst the pigeons.
> My pip pin hole is circular as are many (its easier to make a cover for
> them). Since a circular hole is more "efficient" circumference wise (as
> opposed to a rectangle) the circumference of mine aint big enough.
>
> PFA have advised not to modify them to meet the criteria but to wait for
> the revised design - oh and most importantly "Do not fly the aircraft".
>
> For those that may have a similar problem the formula is Circumference
> is 3.142 x diameter. Area is 3.142 x radius squared.
>
> Limits are
>
> Base of recess must be more than 170 sq mm
> Circumference of recess must be more than 125mm
>
> Also recess must have at least 2 layers of bid and must have flox
> corners at the join with the tailplane skin.
>
> A one inch (25mm) diameter pip pin recess fails the above criteria -
> Area 490sq mm - Circumference only 78mm.
>
> What a bummer.
>
> ----- Original Message -----
> *From:* Mike Gregory <mailto:m.j.gregory@talk21.com>
> *To:* europa-list@matronics.com <mailto:europa-list@matronics.com>
> *Sent:* Wednesday, June 20, 2007 4:58 PM
> *Subject:* Europa-List: RE: EUROPA PIP-PIN RECESS
>
> *To all Listers*
>
> *Please see the updated safety bulletin on the PFA web site - see
> link below.*
>
> *Mike*
>
> *Europa Club Safety Officer*
>
> *EUROPA SAFETY ALERT UPDATE!*
>
> EUROPA SAFETY BULLETIN RAISED TO *ISSUE 2* TO INCLUDE FURTHER
> GUIDANCE ON ACCEPTANCE DESIGNS OF PIP-PIN RECESSES IN TAILPLANES.
>
> Europa Flight Safety Bulletin 006
> <http://www.pfa.org.uk/News%20Update/Europa.pdf>
>
> *
>
>
href="http://www.matronics.com/Navigator?Europa-List";>http://www.matronhref
"http://forums.matronics.com";>http://forums.matronics.com
>
> *
>
> *
>
>
> *
--
Graham Singleton
Tel: +441629820187
Mob: +447739582005
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