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Yak 50 DC

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mj(at)yakuk.com
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Posted: Mon Feb 12, 2007 12:39 am Post subject: Yak 50 DC

Mark, on the 50 you will find that the main fuse which is mounted in the

centre of the grey box can fail through vibration. The wire breaks of at the

caps internally. Just for a test, solder a wire along the outside of it.

This is a pain failure as it can be intermittent in our experience. 



 



Various manuals http://www.yakuk.com/manuals.asp are here. The tech

description has the drawings for the 50.



Mark Jefferies for YAK <http://www.yakuk.com>  UK Ltd

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yakplt(at)yahoo.com
Guest

Posted: Mon Feb 12, 2007 7:39 am Post subject: Yak 50 DC

Hi Mark.  Great advice, thank you for taking the time to write.  I had what you have described happen already and it did exactly as you said!   I went right to those fuses first this time with no luck.  It appears the main contactor relay is not closing, although I havfe no idea why yet.  First, I can hardly fit into that hole to get into the aircraft to work on it.  Second, working on it with the engine running is rather unnerving to say the least.  I am going to try something different.  I have a variable power supply that I can crank up to 28 volts.  I plan on disconnecting the generator and hooking up that power supply to emulate it.  I will probably put a light bulb on the generator field wire to act as a load for the carbon pile regulator.  Using that, I THINK I may be able to troubleshoot the circuits real time just as if the engine were running.   I have never tried anything like this before,  but I can not think why it would not work in theory.  The electrics on these aircraft are really not a whole lot of fun to work on.  I am eye-balling that B&C SK-35 alternator replacement with a keen eye right about now, but wow... very expensive.  

   

  Anyway, thanks one and all for all the help, and I will give a report of success or failure!  

   

  Mark Bitterlich

  N50YK



Mark Jefferies YAK UK <mj(at)yakuk.com> wrote:

  [quote]--> Yak-List message posted by: "Mark Jefferies YAK UK" 



Mark, on the 50 you will find that the main fuse which is mounted in the

centre of the grey box can fail through vibration. The wire breaks of at the

caps internally. Just for a test, solder a wire along the outside of it.

This is a pain failure as it [quote][b]

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