---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Wed 08/05/20: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:47 PM - Re: Shimmy vibration? (woodja51) 2. 09:56 PM - Re: Nose gear collapse (woodja51) ________________________________ Message 1 _____________________________________ Time: 09:47:15 PM PST US Subject: Yak-List: Re: Shimmy vibration? From: "woodja51" Another area that can cause apparent shimmy is if there is wear in the extension actuator upper/lower attachment points. I had no end of trouble with shimmy -to the point I replaced the entire nose leg, tried to balance the tyre with lead, changed the tyre, noise wheel bearings - you name it. Lift the nose wheel and see if there is any movement in the fore aft direction. You might notice this when you taxi as a pronounced clunking from the nose/firewall etc. If there is any significant wear in the upper actuator attach point you might be able to take it out with adjusting the lower rod ( the over centre scissor) but be very careful not to overdo it otherwise the down stay won't stay over centre and the nose gear can collapse. In my case, about half -one turn fixed the majority of the issue. All the other points may contribute of course. Matt Read this topic online here: http://forums.matronics.com/viewtopic.php?p=497525#497525 ________________________________ Message 2 _____________________________________ Time: 09:56:31 PM PST US Subject: Yak-List: Re: Nose gear collapse From: "woodja51" Moving the aircraft without actuators installed will most definitely lead to a collapse. Without the air /and or balls locked in, the same thing might happen depending on which way you move it. For the interest of safety, making up some gear locks when doing anything on the undercarriage unless its on jacks is a good idea. These might simply be two bits of half tube with strong zip ties to ensure the down stay remains over centre. Or a piece of appropriate sized wood inserted to ensure the over centre. even modern airliners ground crew ( in general ) insert the lock pins when towing aircraft - even with hydraulics applied. FWIW. M Read this topic online here: http://forums.matronics.com/viewtopic.php?p=497526#497526 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-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/yak-list Browse Digests http://www.matronics.com/digest/yak-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.