DA 42 accident

Thomas, et al,
I agree about our legacy systems having single points of failure (SPOF);
but I would hope the new technology offered by FADEC would begin to
eliminate those SPOFs without introducing new ones. It appears to me that we
still have all of the legacy SPOFs and have now added new ones. Prior to
FADEC we didn't even have to have an electrical system to make an engine
run.

--
Jim Carter
Rogers, Arkansas
"Thomas Borchert" wrote in message
...
Jose,

However, it does seem to be a serious oversight
that the engines themselves can't supply their own juice.


That will become totally common with FADEC engines. It's just DIFFERENT
failure modes we have to be used to - our current old engines have
single failure points, too.

--
Thomas Borchert (EDDH)

On 2007-04-23 11:32:17 -0700, "Gig 601XL Builder"
wrDOTgiaconaATsuddenlink.net said:

Neil Gould wrote:
Recently, Karl-Heinz Kuenzel posted:

Neil Gould schrieb:
I have a somewhat different take on this event. [...]
I don't find it
surprising that the props feathered in this situation, and would
even say that it would be the expected behavior, rather than a fluke
of some kind. I would find it surprising if Diamond doesn't have
adequate information about their flight systems in the POH to inform
the pilot of this possibility.


OK Neil.

You find it in the article.

My Deutsch is far too rusty to find it in the article. ;-)

POH - Under - abnormal operating procedures - 4B.7 STARTING ENGINE
WITH EXTERNAL POWER - #13 Opposite engine ..... START WITH NORMAL
PROCEDURE

That is it.

That's fine for starting the engines, but that isn't the only issue,
is it?

Is there nothing in the POH about the electrically powered items
(landing gear, FADEC, etc.)? If there is, it shouldn't require an EE
degree to realize that one should be concerned about the condition of
the batteries, charging, etc. if one has to "jump start" the engine,
or to realize that something critical is in need of attention.

Maybe I'm just an overly cautious type. ;-)

Neil

I agree that if you are flying what is basically an all electric aircraft
and you have an electrical problem on the ground that you should take extra
care before flight BUT, there should be some system in place that doesn't
allow the gear switch, landing lights or any other electrically operated
item to become an OFF switch with out some damn significant warning.

Either that, or put in a big enough generator to run everything. Good
grief, this airplane had batteries, backup batteries, two alternators,
and a generator. It had warning lights and systems which should have
told the pilot that only the generator was working. The pilot should
have known that the generator does not generate full electrical power.
How much redundancy is enough? You spend a fortune on a plane and don't
learn the emergency procedures? What's up with that?
--
Waddling Eagle
World Famous Flight Instructor