HondaJet: Not A Steam Gage In Sight

On 19 Oct 2006 16:15:29 -0700, "Bucky" wrote in
.com:

Neil Gould wrote:
It will be interesting to see how this one is FAA-certified. Power failure
would be a worst-case scenario, so I'd be surprised if this plane lacked
multiple power sources, but a lightning hit could be a problem.

I thought modern jets don't have steam gauges as backups anymore.

What do you do when the electrical system fails?

In article ,
Larry Dighera wrote:

On 19 Oct 2006 16:15:29 -0700, "Bucky" wrote in
.com:

Neil Gould wrote:
It will be interesting to see how this one is FAA-certified. Power failure
would be a worst-case scenario, so I'd be surprised if this plane lacked
multiple power sources, but a lightning hit could be a problem.

I thought modern jets don't have steam gauges as backups anymore.

What do you do when the electrical system fails?

Peanut gauges are electric, but they have their own power, independent
supply.

Larry Dighera wrote:
What do you do when the electrical system fails?

Kiss your arse good-bye!.

Larry Dighera wrote:
What do you do when the electrical system fails?

I found this article on the Airbus 320, which has an all glass cockpit:

"The energy supply is backed up in several ways. Along with one
generator per engine, a third generator is powered by the APU. A fourth
power supply is available by extending a little fan generator into the
airstream. The chances of experiencing a complete power loss in an A320
are calculated to be at around one in one trillion. Should this happen,
the above mentioned mechanical system of the rudder and the elevator
trim ensure a safe landing."

http://www.flug-revue.rotor.com/FRhe...09/FR9709a.htm

Recently, Bucky posted:

Larry Dighera wrote:
What do you do when the electrical system fails?

I found this article on the Airbus 320, which has an all glass
cockpit:

"The energy supply is backed up in several ways. Along with one
generator per engine, a third generator is powered by the APU. A
fourth power supply is available by extending a little fan generator
into the airstream. The chances of experiencing a complete power loss
in an A320 are calculated to be at around one in one trillion. Should
this happen, the above mentioned mechanical system of the rudder and
the elevator trim ensure a safe landing."

http://www.flug-revue.rotor.com/FRhe...09/FR9709a.htm

That's all well and good for the failure modes of the on-board generators.
How did they protect against the power surge that a lightning hit could
impose that could take out the PFDs?

Neil

"Bucky" wrote in message
oups.com...
Larry Dighera wrote:
What do you do when the electrical system fails?

I found this article on the Airbus 320, which has an all glass cockpit:

"The energy supply is backed up in several ways. Along with one
generator per engine, a third generator is powered by the APU. A fourth
power supply is available by extending a little fan generator into the
airstream. The chances of experiencing a complete power loss in an A320
are calculated to be at around one in one trillion. Should this happen,
the above mentioned mechanical system of the rudder and the elevator
trim ensure a safe landing."

http://www.flug-revue.rotor.com/FRhe...09/FR9709a.htm


Didn't a G5 lose ALL 5 Honeywell MFD's at the same time last year?
As I remember, it was the second time it had happened. An all "Black" glass
cockpit.


Al G

In article , "Al G"
wrote:

Didn't a G5 lose ALL 5 Honeywell MFD's at the same time last year?
As I remember, it was the second time it had happened. An all "Black" glass
cockpit.

But kind of takes the concept of a dark cockpit a little too far. ;-)

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

Bucky writes:

The chances of experiencing a complete power loss in an A320
are calculated to be at around one in one trillion.

There isn't any way to accurately calculate probabilities of the order
of one in a trillion when dealing with physical systems. Estimates
are often off by many orders of magnitude.

--
Transpose mxsmanic and gmail to reach me by e-mail.

"Bucky" wrote in messageI found this article on the Airbus 320, which has
an all glass cockpit:

All glass, except the back-up altimeter and back-up airspeed indicator,
which are mechanical. The back-up attitude indicator has an internal battery
which is normally recharged by the aircraft's system. The FADECs are self
powered but the EICAS is not.

Many steam gauge airplanes will have indicator failures following the loss
of all electricity because the air reference instruments get data from an
air data computer and can't function in a stand-alone mode. Before RVSM ,
many airplanes had purely mechanical air reference instruments on the
co-pilot's side, but now most of those operate on a second air data
computer.

"The energy supply is backed up in several ways. Along with one
generator per engine, a third generator is powered by the APU. A fourth
power supply is available by extending a little fan generator into the
airstream. The chances of experiencing a complete power loss in an A320
are calculated to be at around one in one trillion.

And yet, it did happen recently. A loss of all display units has happened a
number of times.

Should this happen,
the above mentioned mechanical system of the rudder and the elevator
trim ensure a safe landing."

All well and good if one is in VMC conditions. Even then, the landing will
be 'eventful'. In the simulator, in VMC conditions, only 50% get on the
runway without damage and many of those don't stop on the runway. And good
luck finding an airport in the first place without the IRS, GPS, VOR, ADF,
or ATC.

D.