ptag.dev(at)tiscali.co.uk
Guest
|
 Posted: Wed Oct 14, 2009 12:34 am Post subject: Mod 73 ...my reply to Fred Klein on subject. |
 |
|
Hi! Fred
Whilst I don’t purport to be an authority I must contribute as follows:-
As frustrating as you may find it, the Mod 73 identifies a positive eventuality of the centre bush becoming unbonded and allowing the stabilators to migrate outwards and so disengage from the drive pins at the close out rib end. Indeed only a small number were found to have become unbonded but unless mod 73 is effected then you will never be sure, nuisance though it is.
I understand that the main failure found on G-OFHC was a delamination of the final lay ups on the WING close out rib (due to insufficient scuffing preparation (on a photo I saw) and not least by the nearby aft wing lift pin pulling out of the threaded stack of aluminium/layup sandwiches in the rib close out , the aluminium plates having individually moved during curing resulting in the drilled hole prior to threading missing full engagement of the plates.
More recent kits have wider plates allowing for more error of centralization of the hole, the original kits only used 1” wide plates allowing for minimal error but the kit instructions did warn of the potential for the plates to move during working and curing.
It was not the flap pin which failed but indeed the flap drive pin just may have become disengaged by the flap moving outboard.
Whichever came first to precipitate the sequence of events is somewhat immaterial, both mods to wing and stabilators are in best interest but also serious checks of the degree of engagement of the flap drive pin into the flap drive tube when the flaps are deployed should be followed as per Europa Technical Bulletin.
Regards
Bob Harrison G-PTAG
--
| | - 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 |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
