Non-certified parts for a certified plane?

Most of you all know that my interpretation of the installation regulations
is very broad. I don't say that the sucker will fall out of the sky by
installing a DME that is, for all intents and purposes, is a minor
installation and a logbook entry is all that is required by my
interpretation.

HOWEVER, a failed fuel flow transducer WILL cause the airplane to fall out
of the sky under some fairly predictable failure modes. I draw the line at
an uncertificated (PMA at the very least) fuel flow transducer.

Having said that, whatever is DOWNstream of the transducer (readout,
computer, etc.) will NOT cause the aforementioned undesired aircraft descent
and can be sailboat quality for all I care.

Jim



"Bob Noel" wrote in message
...

Also, for non-essential flight gizmos like fuel flows (for example)...
why do I need a certified fuel flow compared to an non-certified one?

Who said you do? Is that flight gizmo one of the instrument listed in
the equipment list for the certified airplane?

RST Engineering wrote:
HOWEVER, a failed fuel flow transducer WILL cause the airplane to fall out
of the sky under some fairly predictable failure modes. I draw the line at
an uncertificated (PMA at the very least) fuel flow transducer.

Does that include JPI's fuel flow computers too?

-Robert

I have absolutely no idea of what process JPI has gone through to insure
fuel flow in the event of a failed transducer or how robust the housing of
the transducer is to insure that it won't fail and spray fuel all over a hot
engine. THey may be great. They may not. I just don't know because I
haven't done the research.

Jim




"Robert M. Gary" wrote in message
oups.com...

RST Engineering wrote:
HOWEVER, a failed fuel flow transducer WILL cause the airplane to fall
out
of the sky under some fairly predictable failure modes. I draw the line
at
an uncertificated (PMA at the very least) fuel flow transducer.

Does that include JPI's fuel flow computers too?

-Robert

RST Engineering wrote:
I have absolutely no idea of what process JPI has gone through to insure
fuel flow in the event of a failed transducer or how robust the housing of
the transducer is to insure that it won't fail and spray fuel all over a hot
engine. THey may be great. They may not. I just don't know because I
haven't done the research.

I believe the JPI transducer is a Shadin.

Ron Natalie wrote:
RST Engineering wrote:
I have absolutely no idea of what process JPI has gone through to insure
fuel flow in the event of a failed transducer or how robust the housing of
the transducer is to insure that it won't fail and spray fuel all over a hot
engine. THey may be great. They may not. I just don't know because I
haven't done the research.

I believe the JPI transducer is a Shadin.

JPI uses a FlowScan transducer according to
http://www.jpinstruments.com/faq.html

I believe Shadin and E.I. also use Flowscan. For all I know there is no
other maker of a PMA (?) fuel transducer.

--
Frank Stutzman
Bonanza N494B "Hula Girl"
Hood River, OR