At 09:41 PM 8/18/2008 -0700, you wrote:
<ftyoder@yoderbuilt.com>
Hello Bob,
Thank you for your suggestions. I will try grounding the oil pressure gauge
directly to the engine case and report the results.
FYI, my plane is a KIS two place all composite that I have been flying for
about 10 yrs. She has a little over 300 hrs. on her. This is a new problem
.As far as I know .I didn't add or change any operating systems prior to
these symptoms showing up.
Thank You Again, Tim
At 01:14 PM 8/19/2008 -0700, you wrote:
><ftyoder@yoderbuilt.com>
>
>Hello Bob,
>
>I did as you suggested and ran a temporary ground wire from the oil pressure
>inst. to the crankcase. THE WIGGLE WENT AWAY!
>
>I'll remove the engine to engine mount jumpers and add a fat ground wire
>from the grounding buss to the crankcase per your recommendation.
>
>Your time and effort, like O.C. Baker's, sure saves a lot of us a ton of
>time and money.
>
> Many Thanks, Tim
I'm pleased that it was such a simple fix. I'm also pleased
that you brought it up here on the List! In spite of our
reverence for The Word according to ISO: (1) cleaning the
spot where a terminal goes to structure and (2)
testing with a super-duper $high$ bonding meter, there
is often too little attention paid to ground system
architecture. "Grounding" is probably one of the least
understood technologies in vehicular systems design.
It gets worse every year with new design goals by the
special interest groups. One bunch of guys worry about
power distribution. Another bunch worries about
antenna performance. Yet another worries about lightning.
Another gets paid for sifting the sands on EMC/RFI
issues. Finally, there's the structures guys who
are more worried about corrosion and do their best
to insulate the important parts that the rest of
the guys are trying to keep connected together!
Fortunately for us in OBAM aircraft land, there
are some pretty simple recipes for success that tend
to yield consistent results over thousands of
airplanes. I've tried to gather those ingredients
together in chapter 5 and keep watching for new
things to add. Your willingness to share your
experience here validates one of the recipes
and is much appreciated.
Bob . . .
