In article Steve Koerner writes:
ClearNav designers:

Please continue to ignore Cochrane's idea for numeric data by voice.
Devices that do that are horridly annoying. It does not work; voice
is painfully slow compared to a glance to the panel and it is
disruptive to thinking as the information arrives at the convenience
of the machine rather than when the pilot wishes to receive it.

I would agree for many bits of information, especially those that are
known and expected. Unfortunately, it is hard to tell which is unexpected.

Even so, expected messages seem to be used in the big iron; from what I
understand, voices announce altitudes above ground during final approach.
They must have thought about the best approach for safety, and know something
about it.


Voice is a good idea only as a brief alert to something important that
the pilot should be advised of that he might not know. Good
application is: AIRSPACE stated exactly once and then not again for
the same airspace segment for say 5 minutes. It only takes once to
make the pilot aware of the issue so that he can monitor it.

I disagree. If you don't want to be explaining it to the feds, you
might want to have a second (third, etc.) warning of something you
didn't hear because of other distractions.


Similarly LANDING GEAR stated exactly once please.

It should state what needs to be done, and repeat it regularly until
done. If busy, stressed, or otherwise distracted, one may need all the
help available. These alerts are most useful when other problems may
be causing distractions, and hopefully not needed when all is going well.


Another
applications for voice would be below 2000 feet near an airport CTAF
ONE TWENTY TWO POINT FIVE ZERO. Or perhaps a voice battery warning
BATTERY ELEVEN POINT FIVE stated once until sometime later BATTERY
ELEVEN POINT THREE. When below 300 feet AGL and below a threshold
airspeed the computer might warn AIRSPEED.

Yes, but it needs to be clear that it is LOW AIRSPEED, PUSH NOSE DOWN.
Just saying AIRSPEED leaves the pilot to figure out why it said it, and
what to do.


Alan