According to my inspector the other reason for the shape of the recess
is to ensure the tailplane can not migrate sideways at all in the event
of the outer tube becoming disbanded. It is important that the head of
the pip pin is obstructed by the sidewall of the recess before the
locating pins could become free in the root of the tailplane. He
inspected my aircraft before this change to the bulletin and as mine
also has circular recesses he suggested that the inboard side be filled
up to ensure this would be achieved. Obviously this is now out of date
and my aircraft is grounded like many others.
Nigel Charles
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Jeremy
Davey
Sent: 20 June 2007 23:41
Subject: RE: Europa-List: RE: EUROPA PIP-PIN RECESS
<europaflyer_3@msn.com>
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.matronh
ref
"http://forums.matronics.com";>http://forums.matronics.com
>
> *
>
> *
>
>
> *
--
Graham Singleton
Tel: +441629820187
Mob: +447739582005
|