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Tailplane torque tube installation

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fklein(at)orcasonline.com
Guest

Posted: Fri Sep 07, 2007 11:17 am Post subject: Tailplane torque tube installation

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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r.collings(at)onetel.net
Guest

Posted: Fri Sep 07, 2007 11:53 am Post subject: Tailplane torque tube installation

Fred  Have a word with Roger at E04 [He is in the office Mondays, Wednesdays 

& Fridays] before you glue it up for good, the one thing I have learnt 

building my Europa is that as soon as you have put something together you 

find a compelling reason to take it apart again!

I am putting together a mod at the moment which if accepted replaces the 

drive pins with fitted bolts as I don't like the idea of glue .Regards 

Richard

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fklein(at)orcasonline.com
Guest

Posted: Mon Sep 10, 2007 3:22 pm Post subject: Tailplane torque tube installation

This just in from E04 on subject topic.



Begin forwarded message:



[quote] From: "Roger Bull" <roger(at)europa-aircraft.com>

 Date: Mon Sep 10, 2007  1:29:24  AM US/Pacific

 To: "Fred Klein" <fklein(at)orcasonline.com>

 Subject: RE: 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



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ptag.dev(at)tiscali.co.uk
Guest

Posted: Mon Sep 10, 2007 9:51 pm Post subject: Tailplane torque tube installation

Hi! Fred 

Sorry but I'm not "your uncle" but I do have a perfect removable fix to

all the problems which doesn't have any doubts about the mixing of glue

and metal components. I have already suffered it the hands of Loctite on

the nose wheel yoke spindle if you remember?  It cost me 18 months

flying, thanks but no thanks.

Regards

BOB Harrison. 



Robt.C.Harrison

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