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Old January 30th 13, 01:09 AM posted to rec.aviation.piloting,rec.crafts.metalworking,rec.aviation.military,talk.politics.misc,alt.society.labor-unions
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Default Is the 787 a failure ?

On Tue, 29 Jan 2013 18:31:09 -0500, "Jim Wilkins"
wrote:

"Jim Wilkins" wrote in message
...
wrote in message
... All the warnings
were there except for the indicators on the instrument panel.


All the warnings were NOT there, and the ones they had were
misleading. The stall indicator shut off below a minimum airspeed
and came on when they correctly put the nose down and gained speed.


I finally found it on page 44 of the main body of the BEA inquest:
"............If the CAS measurements for
the three ADR are lower than 60 kt, the angle of attack values of the
three ADR are
invalid and the stall warning is then inoperative. This results from a
logic stating that
the airflow must be sufficient to ensure a valid measurement by the
angle of attack
sensors, especially to prevent spurious warnings."

The stall warning and pitch attitude graphs are on page 6 of appendix
3.

jsw

And there was no reason under the sun (or stars) for an A3 to be
flying anywhere CLOSE to 60 kt. Minimum landing soeed is over twice
that speed EMPTY. And it goes up the heavier the plane is.

It is virtually impossible to "stall" a functioning A3X plane - it
will just descend like an elevator, under full control. The GPS will
show a rapid rate of descent even when the static port is totally
blocked.