pcondon(at)mitre.org
Guest
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 Posted: Thu Jun 08, 2006 11:43 am Post subject: Super unleaded in 160hp O-320 Auto Fuel STC's ( fine point |
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If you read carefully in the EAA and Perterson STC's for auto fuel
STC's, one notices that all of the STC's are always combined with a
airframe and engine pair, Just to say that the Lycoming-ABCD engine is
STCed is incorrect when this particular example should be Lycoming-ABCD
as installed in a Cessn-1234. Meaning that if the same engine is
installed on a Piper=XYZ may NOT be Stc-able for auto fuel. Everyone
seems to automatically assume that it's the engine only that determines
the STC-ability to use auto fuel, when indeed it's the airframe and
engine PAIR that determines the ability to consume autofeuk
Time: 03:08:32 AM PST US
From: "Jim Sears" <jmsears(at)adelphia.net>
Subject: Re: Super unleaded in 160hp O-320
| Quote: | My understanding is that the engine will work on the mogas but the >
STC
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| Quote: | doesn't cover it. So, it would seem the decision is if you want > to
keep
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| Quote: | your engine certificated.
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One has to look at the STCs. The EAA STC may not cover high
compression
engines; but, the Petersen seems to cover them. Do keep in mind that
STCs,
ADs, etc. do not apply to experimentals; but, one is foolish to not
comply,
in many cases. If the testing was done for the Petersen STC for high
compression approval, I'd think it would be OK to use 91-93 antiknock
fuels
in them. If not, I wouldn't. Fortunately, his STC does seem to cover
them;
so, I'm going to use autogas in my next RV, as well. 
As for the certification, Pat Patterson learned in AB-DAR school that a
certifiied engine is indeed decertified when it is attached to an
experimental. It is true, even if one does not remove the data plate,
which
I refuse to do. Just as Sam said, all one has to do is have an IA
approve
the engine's use on a certified airplane for it to be put back to use
as
such. I'm sure mine could be put back to service with a couple of
changes
like removing the starter and alternator. I kept mine in certified
condition, I thought, by having an A&P sign off the engine at
inspection
time. I quit that when Pat told me what he'd learned. I still have
Pat,
the A&P, help me with the inspection; but, I do the sign off, now.
Actually, I don't know why we worry so much about keeping our engines
certified, anyway. How often do you think an engine from an
experimental is
going to be put back into a certified airplane? Most likely, it will
be
snapped up by another experimental builder before the certified status
comes
into play.
Jim Sears in KY
RV-6A N198JS (Scooter)
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