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Mod 73 Fray

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hagargs(at)earthlink.net
Guest

Posted: Thu Jul 19, 2007 9:06 pm Post subject: Mod 73 Fray

I have been keeping out of the fray as I did not want to add to the 30 or

so E mails every night.  This doesn't apply to the European types as they

must pay homage to the PFA.  I am surprised to note that no one has

mentioned a modification that was detailed in what I believe was sent in to

the Europa Newsletter when it was being published years ago.  I had done

this to my tail planes and it appears to be pretty robust and not dependent

on the TP6 debonding to keep the integrity of mating of  the drive pins at

the tail plane root.  The deviation involved making a receptacle in the 

top of the  tailplane out of an internally threaded PVC pipe stub.  Mine

has about an inch and  a half inside diameter.  This is positioned so that

the pip pin is almost touching the  inboard periphery of the ID. Debonding

of TP6 would result in the pin acting in shear against the inside of the

receptacle, holding the tailplane in place.  I turned the OD of the unit a

little over 2" before I bonded down into the meaty thickness of the upper

tailplane.  A plug was turned to thread into the cavity top so this holds

the pip pin in weather the balls are sprung or not.  I don't  have alot of 

hours on the aircraft yet for a history however it has been rigged and

derigged at least 75~100 times.  I have had  the TP5's come loose and have

done work on them.  These are exposed to greater stress as  when you put

the planes on and they are not exactly level you invariably have some

levering action  going on until you get things started  and pushed in.  



Just My 2 cents



Steve Hagar

A143

Mesa AZ

N40SH

 	  Quote: 	
		   [Original Message]

 From: josok <josok-e(at)ukolo.fi>

 To: <europa-list(at)matronics.com>

 Date: 7/14/2007 11:01:39 AM

 Subject: Re: Europa Tailplane - Mod 73



 



 Hi Richsrd,

http://www.europaclub.org.uk/mods/improved_tp5_and_tp6_sleeve_retention.shtm
	


l

 	  Quote: 	
		  

 Europa club pages,



 Regards,



 Jos Okhuijsen

 Visit -  www.EuropaOwners.org

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

Brian Davies

Joined: 10 Jan 2006
Posts: 124
Location: uk

Posted: Fri Jul 20, 2007 11:29 am Post subject: Mod 73 Fray

Steve,



The PFA were made aware of the many builders that have incorporated this

change and they determined that this arrangement did not meet the

requirement to provide a secondary retention for TP6.  In fact, this is what

led to the grounding of many UK Europas.



Personnally, I think the very quick issue of Mod 73 was as a result of the

PFA becoming aware of so many non standard pip pin recesses.  I think they

were a bit shocked because the build manual is quite clear in saying that

changes to the recess requires PFA mod approval (in the UK). Mod 73 may not

be elegant but it does create a known build standard across the fleet and

removes the need to tear out the many non standard arrangements  (for UK

owners).



In case you think I am sounding rather  "holier than thou"" over this - I

was also grounded because of non standard pip pin recesses.



Brian Davies



--

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mp.gamble(at)tiscali.co.u
Guest

Posted: Fri Jul 20, 2007 12:26 pm Post subject: Mod 73 Fray

Brian,

Am I correct in thinking then that a modified pip pin cavity on the top

surface can remain as is, complete with plastic fitting with screw top,

whilst the new one is constructed as per mod 73 in the under surface?

Mike Gamble

XS 440 mono



---

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Brian Davies

Joined: 10 Jan 2006
Posts: 124
Location: uk

Posted: Fri Jul 20, 2007 2:01 pm Post subject: Mod 73 Fray

Mike,



To quote from Francis Donaldson letter of 12 July,



" Installing Europa mod 73 removes the requirement for the existing pip-pin

recesses to comply with the dimensional criteria specified in PFA

247/FSB-006." 



I have interpreted that to mean leave things alone on the top surface.



Brian



--

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