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Old October 3rd 06, 03:48 PM posted to rec.aviation.piloting
John Theune
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Posts: 159
Default NW_Pilot's Trans-Atlantic Flight -- All the scary details...

Neil Gould wrote:
Recently, Jay Honeck posted:

However, in this case, the fuel sensor failure caused a total system
failure,
Actually, we do not know this. We can assume it, and the evidence is
pretty strong, but there might have been other factors which we
don't know.

True. In addition to the fuel sensor "overload" (it didn't really
fail -- it just sent info to the G1000 that made no sense), he also
experienced a CO sensor failure, and (later) a tach failure.

It's hard to say what caused what to happen, without more data.

I agree that we are in no position to determine the cause of the problems;
they could be specific to this particular unit, or caused by damage during
the installation of the ferry tank and other panel mounted items rather
than the general design of the G1000. However, it still troubles me that
Garmin told NW_Pilot that the system can experience similar problems
during stalls and in slow flight. That *does* sound like the G1000 has
some design issues that need sorting out.

Neil



I just went back and reread his account. ( I'm not flaming Steven but
if you've read his emails before you know that his written words can
often be difficult to read for content ) He said that the fuel readings
went to red Xs ( as a properly designed system with a out of spec sensor
should ) after flying ( and venting excess fuel for 7 hours ) Then he
got a CO2 warning then a GPS-1 failure. It was after the GPS1 failure
that the unit rebooted. Now failure of the fuel system I would not want
a reboot for but in some situations failure of the primary navigation
system may be grounds for a reboot depending on what failed. After the
reboot completed he was missing readings like fuel and airspeeds. He
mentions other errors but does not say what they were. He does not
specifically say that the system rebooted again directly. He said in
summery it was continually rebooting but I question that. Steven - Was
it rebooting or did it just reboot once after the initial failure? He
mentions that on downwind the fuel readings were working again but then
failed again during turn to final. Did the sensors starting given valid
information after the fuel burned off enough to have then in range and
then fail again during the turn? Not sure. He does mention the G1000
rebooting again during his landing. Was this the second reboot? Did
other instruments fail again? Too many questions and not enough
information to say for sure.