This just in from E04 on subject topic.
Begin forwarded message:
> From: "Roger Bull" <roger@europa-aircraft.com>
> Date: Mon Sep 10, 2007 1:29:24 AM US/Pacific
> To: "Fred Klein" <fklein@orcasonline.com>
> Subject: RE: Europa-List: Tailplane torque tube installation
>
> Fred,
>
> We shall probably soon be issuing a Service Bulletin which will
> probably
> require the TP9 and the two TP12's to be Loctited - however this is
> still not finalised with the PFA.
>
> If it goes ahead the preferred Loctite will be 603, which is strong and
> which is reasonably oil tolerant. However it goes off very quickly,
> and
> you wouldn't have time to do it as you suggest below. We have carried
> out tests, and the bond is strong enough if the Loctite is introduced
> by
> capillary action to the components when they are in position.
>
> I suggest you wait until the Bulletin is finalised and published - it
> will give enough detail for the method.
>
> Best regards,
>
> Roger
>
> -----Original Message-----
> From: Fred Klein [mailto:fklein@orcasonline.com]
> Sent: 07 September 2007 22:30
> To: Roger Bull
> Subject: Fwd: Europa-List: Tailplane torque tube installation
>
> What do you think Roger?
>
> Begin forwarded message:
>
>> From: Fred Klein <fklein@orcasonline.com>
>> Date: Fri Sep 7, 2007 12:13:56 PM US/Pacific
>> To: europa-list@matronics.com
>> Subject: Europa-List: Tailplane torque tube installation
>> Reply-To: europa-list@matronics.com
>>
>>
>> I am at the happy stage of preparing to tap home the four drive pins,
>> attach the washers and cotter pins, and call it good; my goal is to
>> ensure (or raise the level of probability) that no slop EVER develops
>> between TP9, the two TP12's, and TP4. The question facing me is
>> whether or not I should loctite these components together.
>>
>> I've read the posts of those who have ventured into the tailcone to
>> deal w/ such slop (or "play") with profound admiration; if I'm ever in
>
>> the company of a Europaphile who's done this successfully, everyone
>> present will enjoy a round of drinks on me.
>>
>> Since I am installing the 3/8" pins, my sense is that preventing wear
>> from occurring is the key...hence the notion that loctiting now is
>> better (and easier) than doing so later. My sense also is that if for
>> some reason in the future I find the need to remove the torque tube,
>> warming up the loctite so it will release will be the least of my
>> problems. Having taken the torque tube to a machine shop to have the
>> 1/4" holes enlarged for the 3/8" pins, I now have a good interference
>> fit with no play whatsoever.
>>
>> It appears to me that the best way to apply loctite in this situation
>> would be to rotate TP9 & TP12 on TP4 away from the holes, dispense the
>
>> loctite in the holes of TP9 & TP12 onto the surface of TP4, and then
>> realign the holes, drive the pins, and "Bob's your uncle".
>>
>> Mentally, I've run this thru my "min/max regret analysis" and
>> concluded that this is the thing to do. If anyone thinks this is
>> unwise, please let me know before I do something stupid! And, if
>> you'd known about the wear issues of these components when you were at
>
>> this stage, would you have used loctite?
>>
>> Thanks for all responses,
>>
>> Fred
>> A194
>>
>>
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