Non-certified parts for a certified plane?

[Dico]

Hello,

Do I need certified engine monitors for a certified plane if I keep the
factory ones installed? I was asking this to someone at our airport
today and they thought that I could install, for example, one of those
fancy engine monitors you see in experimental airplanes, as long as I
had the certified counterparts that are required (egt, cht, fuel flow,
etc). Is this true?

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?

Thanks,

-dr

[Newps]

Dico wrote:
> Hello,
>
> Do I need certified engine monitors for a certified plane if I keep the
> factory ones installed? I was asking this to someone at our airport
> today and they thought that I could install, for example, one of those
> fancy engine monitors you see in experimental airplanes, as long as I
> had the certified counterparts that are required (egt, cht, fuel flow,
> etc). Is this true?

Not without a field approval.


>
> 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?

Because.

[RST Engineering]

"Dico" > wrote in message
ups.com...
> Hello,
>
> Do I need certified engine monitors

What's a certificated part (engine monitor)


for a certified plane

What's a certificated plane?

Jim

[Steve Foley[_2_]]

"RST Engineering" > wrote in message
...
>
> "Dico" > wrote in message
> ups.com...
>> Hello,
>>
>> Do I need certified engine monitors
>
> What's a certificated part (engine monitor)
>
>
> for a certified plane
>
> What's a certificated plane?


I hearby certify that this here thingy is a plane.

Signed:

The Honorable Steve Foley


>
> Jim
>

[Bob Noel]

In article om>,
"Dico" > wrote:

> Hello,
>
> Do I need certified engine monitors for a certified plane if I keep the
> factory ones installed? I was asking this to someone at our airport
> today and they thought that I could install, for example, one of those
> fancy engine monitors you see in experimental airplanes, as long as I
> had the certified counterparts that are required (egt, cht, fuel flow,
> etc). Is this true?

I suppose it would depend on what you define as a "certified part".
The KN 64 DME is, last I knew, not a certified DME (i.e., not TSO'd).
But the installation of that DME in my airplane is approved with
an STC and appropriate 337. Does that make it a certified part?

My suggestion to talk to your A&P/IA.


>
> 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?

--
Bob Noel
Looking for a sig the
lawyers will hate

[RST Engineering]

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?

[Robert M. Gary]

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]

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
>

[Jon Kraus]

The certified parts are the ones that get looked at during the annual
inspection. Don't you know anything... :-)

Jon Kraus
'79 Money 201
4443H @ UMP



RST Engineering wrote:
> "Dico" > wrote in message
> ups.com...
>
>>Hello,
>>
>>Do I need certified engine monitors
>
>
> What's a certificated part (engine monitor)
>
>
> for a certified plane
>
> What's a certificated plane?
>
> Jim
>
>

[Ron Natalie]

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.

[Frank Stutzman]

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