---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Tue 11/01/16: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 10:16 AM - PLEASE READ - Matronics Email List 2016 Fund Raiser During November! (Matt Dralle) 1. 01:29 AM - Re: door hinge screw query (John Wighton) ________________________________ Message 0 _____________________________________ Time: 10:16:23 AM PST US From: Matt Dralle Subject: Europa-List: PLEASE READ - Matronics Email List 2016 Fund Raiser During November! Dear Listers, Each November I hold a PBS-like fund raiser to support the continued operation and upgrade of the Email List and Fourm Services at Matronics. It's solely through the Contributions of List members (you) that these Matronics Lists are possible. 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Matt Dralle Matronics Email List Administrator RV-4/RV-6/RV-8 Builder/Rebuilder/Pilot ________________________________ Message 1 _____________________________________ Time: 01:29:19 AM PST US Subject: Europa-List: Re: door hinge screw query From: "John Wighton" Rowland, The manual 35_CBM - 35 FITTING DOORS from the Europa website, Fig 5 shows the intended design condition of the door hinge installation. The screws into the upper hinge leaf are shown countersunk with a knife-edge condition (poor practice #1), the figure is probably not to scale but there looks to be significant material for the counter-bore, a washer and the nut. It shows an almost flush screw (i.e. less than 1 complete thread as normally required) (poor practice #2). I note the lower hinge leaf has a protruding head fasteners with integral washer.(AN525-10R10) and a non counter-bored retaining nut (good practice #1). The critical failure mode as drawn is a head-side pull through (due to tension and prying) of the upper screw. For high time aircraft this may be surpassed by a tensile failure initiated by a fatigue crack between the countersinks. Hence l think you could increase the depth of the counter-bore slightly to ensure one protruding screw thread and a flush OML (outer mould line). Minimise the countersinking. Looking at my own aircraft l found both sides countersunk. This enables a slight over-parallel condition of the hinge leaves - to account for built tolerance (in other words there is no room for the head of the AN525-10R10). This has the slight benefit of ensuring both sides of the hinge flex a similar amount - thereby reducing the likelihood of a fatigue crack on the more flexible side (as drawn). A redesign to today's interpretation of the regulations and compliance standards would require adherence to best practice design principles. This would most likely result in slightly thicker hinges, 130 deg countersinks with corresponding shallow head fasteners, a third fastener on each hinge (offset centreline to alleviate the prying action). JW -------- John Wighton Europa XS trigear G-IPOD Read this topic online here: http://forums.matronics.com/viewtopic.php?p=461787#461787 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.