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Date: Sat, 19 Jan 2013 18:27:23 -0500
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Subject: Re: [LML] RPM on IO550N
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From: Richard Ogg <rogg@aol.com>
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What kind of ignition=20

Sent from My rock pad and chisel


On Jan 18, 2013, at 12:04 PM, Berni Breen <bbreen@cableone.net> wrote:

> I just started experiencing widely varying RPM read outs on all 3 of the g=
auges of my Lancair Legacy.  During run up and subsequent take off my MFD, P=
FD and EIS all show correct RPM read outs.  Not until I get into cruise and s=
et the prop to 2400 do I see the problem.  I slowly begin to see all 3 of th=
e read outs start to show a 2300 to 2600 (or there abouts) variance.  All 3 g=
auges are in sync and agreement on the numbers.  In other words, they all 3 r=
ead the same thing and the variance is very rapid up and down.  Since I have=
 already concluded that the prop governor is functioning properly and I do n=
ot feel or hear a prop pitch change during these occurrences, I am all but 1=
00% sure I have some sort of erroneous information being sent to my "glass" a=
nd therefore erroneous readings.  As such I believe I need to check all of t=
he wiring and or "pick ups" between the engine and my MFD, PFD and EIS.  My p=
roblem is that I am not familiar with any of that.  Can someone reading this=
 please help me get started by suggesting where I should look for the source=
 of where my equipment gets the RPM information from the IO550 (location of p=
ick up)?  Further, any kind of procedure to track down where or what my prob=
lem might be would be most appreciated.
>=20
> BTW, my read outs are on my GRT HX MFD and PFD as well as my VP200.  I kno=
w these units are displaying what they believe to be accurate information as=
 everything else is functioning flawlessly.  I removed my prop governor, sen=
t it for overhaul and it checked out perfect.
>=20
> Sent from my iPad
> Berni Breen
> Bbreen@cableone.net
> --
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