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Grand Rapids EIS Problem

 
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MJKTuck(at)cs.com
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PostPosted: Tue Feb 03, 2009 6:53 pm    Post subject: Grand Rapids EIS Problem Reply with quote

Hi Folks,

Thanks to all who offered suggestions for the problems I have been
having with my EIS.

I decided to disconnect each sender in turn to find out which one
appeared to causing the fluctuations. Things got progressively worse,
the unit seemingly turning off and on again repeatedly. I had to cut my
testing short to pick the girls up from their play date and returned the
next day. The next day the unit didn't even turn on, so I started the
engine anyway and it kicked it back into life.

By this time I had disconnected all the senders and the unit was dying
fast! The problem was either the unit itself or the simple wiring to the
unit from the distribution panel. Out came the panel.

I got it home connected a 12V supply and everything turned on as it
should. I fiddled with the wires and sure enough the unit was turning on
and off again. Ah ha! Upon closer inspection I found that the earth
connector and wire was being held together by the heatshrink tube and
some flexing indicated a fracture - caused by vibration no doubt -
although I am surprised at that.

Anyhow, all is soldered up and I'm hoping that this very obvious
solution will fix the indication problems - I suspect that it will.
That's kind of the problem with digital readouts that they spool up as
you power up and obviously down again if getting intermittent power loss.

Time will tell, it is supposed to be nice this weekend.

Regards,
Martin Tuck
Europa N152MT
Wichita, Kansas


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Rowland_Carson



Joined: 04 Jul 2008
Posts: 155
Location: Cheltenham, England

PostPosted: Wed Feb 04, 2009 12:09 am    Post subject: Grand Rapids EIS Problem Reply with quote

At 2009-02-03 20:51 -0600 Martin Tuck wrote:

Quote:
Upon closer inspection I found that the earth connector and wire was
being held together by the heatshrink tube and some flexing
indicated a fracture - caused by vibration no doubt - although I am
surprised at that.

Anyhow, all is soldered up

Martin - it sounds as though the solder joint was the cause of the
fracture. That's why crimps are preferred for most aircraft wiring
terminations. If you have to make a solder joint, it needs to be
supported well back along the insulation. This is because the solder
"wicks" along the wire back from the joint and thus makes it
inflexible. The usual point of failure is at the interface between
the solder-stiffened length and the original flexible state, and this
can be a surprisingly long way from the termination. As you've found,
heatshrink is not enough support, it really needs to be secured for
some length onto something rigidly attached to the thing it's
soldered onto.

regards

Rowland
--
| Rowland Carson LAA #16532 http://home.clara.net/rowil/aviation/
| 1180 hours building Europa #435 G-ROWI e-mail <rowil(at)clara.net>


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