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Date: Tue, 25 Mar 2014 16:22:59 -0400
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From: "Jay Phillips" <jayph@fastairplane.net>
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Subject: RE: [LML] TSIO 550 temp sensors
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John,

Simple sensors such as temperature usually fail hard to one side or the
other, ie. Show some ridiculous value and never change. If the value is
jumping around erratically it is most likely to be wiring. A broken wire
which makes partial contact combined with a vibrating engine gives this
result.

Jay Phillips

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of John
Barrett
Sent: Tuesday, March 25, 2014 8:47 AM
To: lml@lancaironline.net
Subject: [LML] TSIO 550 temp sensors

I am having temp output discrepancies from one of the TIT sensors so am
considering getting a replacement sensor to see if that fixes it. The turbos
are Garrett's.

As of last few flights, oil temp feedback is also going sideways.  It's
normal during run up and first part of the flight but at cruise it
intermittently drops down in to the red arc as low as 40 or 50  degrees and
jumps around from there to actual temps.  The problem could be in the wiring
or could be the sensor itself.  If the part is not too expensive I would
just purchase and install while looking for the cause.  Same is true for the
TIT probe.

Can anyone tell me where to purchase and what parts to order?

Thanks,
John
31VP


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