DA 42 accident

That big gear at the back of the engine that drives the mags is a single
point of failure. While it is a very robust object, it's still driving
both mags.

There are a few significant differences between this SPOF and the DA42
electrical SPOF. That big gear is =part= of the engine (in the same
sense that the mags are part of the engine), and it does not drive
anything else. Were that gear to also drive (say) the air conditioner,
then the air conditioner could put unwanted stress on the gear and
possibly break it. This is what (I gather) could happen with the
DA-42's design, where the electrical bus in question is not =dedicated=
to the engine.

Jose
--
Get high on gasoline: fly an airplane.
for Email, make the obvious change in the address.

On 2007-04-28, Jose wrote:
anything else. Were that gear to also drive (say) the air conditioner,

Well, that big gear usually drives the vacuum pump, and it's not unknown
that it also drives the generator or alternator.

--
Yes, the Reply-To email address is valid.
Oolite-Linux: an Elite tribute: http://oolite-linux.berlios.de

Dylan Smith wrote:

It's not a question that FADECs will fail - but what will be more
failure prone: a manual-everything engine where the pilot can mismanage
the engine into quitting, or a FADEC that can lose electrical supply and
cause the engine to quit.




Not all FADEC's fail with the loss of electrical power. The PRISM
system will continue to run without electricity. Matter of fact I'm not
aware of any other system that fails with a loss of electrical power.

On Apr 26, 5:54 pm, Newps wrote:
Not all FADEC's fail with the loss of electrical power.

All true FADECs will fail. In a full authority electronic system, no
juice = no electronics.

The PRISM
system will continue to run without electricity. Matter of fact I'm not
aware of any other system that fails with a loss of electrical power.

That's because PRISM (and ePiC) are not Full Authority systems. Not
even close. They're simply electronic aids to timing, fuel flow,
etc. They're no more a FADEC than an electronic ignition on a car
is.

Kev

Newps,

The PRISM
system will continue to run without electricity.


The not-yet-certified PRISM, as opposed to the certified system in the
Thielert?

PRISM is not a FADEC.

--
Thomas Borchert (EDDH)

"Newps" wrote in message
. ..


Dylan Smith wrote:

It's not a question that FADECs will fail - but what will be more
failure prone: a manual-everything engine where the pilot can mismanage
the engine into quitting, or a FADEC that can lose electrical supply and
cause the engine to quit.




Not all FADEC's fail with the loss of electrical power. The PRISM system
will continue to run without electricity. Matter of fact I'm not aware of
any other system that fails with a loss of electrical power.


What ever happened to GAMI's PRISM system?

Matt,

What ever happened to GAMI's PRISM system?


It'll be certified rsn...

--
Thomas Borchert (EDDH)