Re: The possibility of vms opening up?

Karsten Nyblad wrote:
(The experience from fly by wire plans like Airbuses is that it is
difficult to design the user interface in such a way that pilots do not
make errors. A couple of Airbuses have crashed because of that. To my
knowledge no Airbus has crashed because the software did not do as
expected.)

While no A320 has crashed because of software errors, there have been
many near misses because of software glitches in the first 2 years. One
of them was some problem between cabin temperatur controls and engine
thrust controls. Cabin stff were instructed NOT to change the cabin
temperature setting while in flight until that big was found and fixed.


The most famous crash at Habsheim was essentially human error. The test
pilots brough the plane in at too low a speed for them to be able to
speed up in time to climb above the trees. The aircraft systems acted as
designed: prevent a stall. Pilots complained that the aircraft did not
respond when they pulled the nose up. The plane could not start to climb
at such a low speed without stalling and falling flat on its belly.

There was one early problem and that was training. Pilots were not
trained properly to be endoctrinated onto the new flight philosophy. And
that caused some problems with human/computer interaction with pilots
fighting the computer instead of using it. Once training was adjusted,
the aircraft became quite reliable and far less complaints about it.


VMS itself is tried and tested and a well known entity. But there are
newer parts to VMS such as the TCPIP stack which are not as well tested/proven.
.

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