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Date: Tue, 22 Jan 2013 12:25:47 -0500
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Subject: Re: [LML] Re: RPM on IO550N
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From: Richard Ogg <rogg@aol.com>
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Have you tried to see if its the mag or the electronic that causes the bad r=
pm readings

Sent from My rock pad and chisel


On Jan 22, 2013, at 4:41 AM, Berni Breen <bbreen@cableone.net> wrote:

> I have one mag and one electronic ignition
>=20
> Sent from my iPad
> Berni Breen
> Bbreen@cableone.net
>=20
> On Jan 19, 2013, at 4:27 PM, Richard Ogg <rogg@aol.com> wrote:
>=20
>> What kind of ignition=20
>>=20
>> Sent from My rock pad and chisel
>>=20
>>=20
>>=20
>> On Jan 18, 2013, at 12:04 PM, Berni Breen <bbreen@cableone.net> wrote:
>>=20
>>> I just started experiencing widely varying RPM read outs on all 3 of the=
 gauges of my Lancair Legacy.  During run up and subsequent take off my MFD,=
 PFD and EIS all show correct RPM read outs.  Not until I get into cruise an=
d set the prop to 2400 do I see the problem.  I slowly begin to see all 3 of=
 the read outs start to show a 2300 to 2600 (or there abouts) variance.  All=
 3 gauges are in sync and agreement on the numbers.  In other words, they al=
l 3 read 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 not feel or hear a prop pitch change during these occurrences, I am all b=
ut 100% sure I have some sort of erroneous information being sent to my "gla=
ss" and therefore erroneous readings.  As such I believe I need to check all=
 of the wiring and or "pick ups" between the engine and my MFD, PFD and EIS.=
  My problem is that I am not familiar with any of that.  Can someone readin=
g this please help me get started by suggesting where I should look for the s=
ource of where my equipment gets the RPM information from the IO550 (locatio=
n of pick up)?  Further, any kind of procedure to track down where or what m=
y problem 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 k=
now these units are displaying what they believe to be accurate information a=
s everything else is functioning flawlessly.  I removed my prop governor, se=
nt it for overhaul and it checked out perfect.
>>>=20
>>> Sent from my iPad
>>> Berni Breen
>>> Bbreen@cableone.net
>>> --
>>> For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.h=
tml
>>=20
>> --
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ml
>=20
> --
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