Agreed; added to which the pin is restrained from unscrewing by the pip pin,
although it could be argued that a plain nut could vibrate off.
But the instructions don't call for the 'potting' of the nut. And the
threads are to be coated with flox; so there would be fat chance of getting
enough heat in to this to debond it without collateral damage, should the
pin need to be moved.
I had in mind glassing-in the nut to the outboard side of the rib. At least
then, only a small hole would need to be made to check that the nut had not
moved, should it be necessary in future to remove the pin.
Duncan McF.
----- Original Message -----
From: "Laptop JR" <jrgowing@bigpond.net.au>
Sent: Thursday, August 30, 2007 10:49 PM
Subject: Re: Europa-List: Mod 74.
>
> Duncan and Fellows
>
> I can't imagine why any locking of the nut is needed either; the pin is
> tight with Loctite and the nut will be encased in the flox mix so cannot
> turn. You would have to heat the pin to remove it. So I also say why the
> nylock or any locking at all needed on the nut?
>
> At least if somehow you ruined the pin you could replace it without
> digging up the wing again.
>
> So I will wait a bit and see what more is said before digging the holes!
>
> JR (Bob) Gowing UK Kit 327 in Oz
>
> ----- Original Message -----
> From: "Duncan & Ami McFadyean" <ami@mcfadyean.freeserve.co.uk>
> To: <europa-list@matronics.com>
> Sent: Friday, August 31, 2007 7:01 AM
> Subject: Europa-List: Mod 74.
>
>
>> <ami@mcfadyean.freeserve.co.uk>
>>
>>
>> Re Mod 74 and the addition of the backnut to the longer-threaded lift
>> pin, the motorglider manual states, by way of comparison, that:
>>
>> "The pin should be screwed into the backnut, not the nut screwed onto
>> the pin. Any
>> mismatch of the angle between the backnut and the rib will be taken out
>> with the Araldite pad that is
>> formed in the process. If you try to tighten the backnut, you may end up
>> with the nut acting as a
>> locknut, which will hinder removal of the pins if required at a later
>> date".
>>
>> We are warned in the Mod 74 instructions that any future removal of
>> the rear lift pins will require digging again through the wing skin to
>> access the nut.
>>
>> What is different about the retention of the nut in the motorglider wing
>> that allows simple removal of the pins? And what is the simple detail
>> that reliably captivates the nut? The latter would seem sensible.
>>
>> I know that Bob H. had given this some thought, but had not included any
>> captivation of the nut.
>>
>> Duncan McF.
>>
>>
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