W
Whoey Louie
Guest
On Thursday, January 9, 2020 at 3:48:57 PM UTC-5, bloggs.fre...@gmail.com wrote:
I think you're referring to the A340 that went down off Brazil? If so,
most of that is wrong. It was not AOA related, it was the pitot tubes
that measure air speed that iced up. And the autopilot didn't decide to
trust any of the sensors. As it lost input, it backed off to alternate
flight rules to allow the autopilot to continue to fly the plane.
When it lost the last speed input it dumped the plane back into the hands
of the pilots. It was during turbulence in a thunderstorms, at night
and the pilots screwed up. The correct procedure was to set the power
at like 70%, maintain a certain nose up pitch and the plane would fly
just fine. One very good question there is why the autopilot didn't
default to simple method as the final step, instead of dumping it to the pilots.
This was another crash that shows how even trained pilots for a major
airline can screw up. I think one of the pilots was continuing to pull
back on the controls as the plane was stalled and heading to the sea.
On Friday, December 20, 2019 at 11:32:14 AM UTC-5, Joseph Gwinn wrote:
On Dec 20, 2019, jlarkin@highlandsniptechnology.com wrote
(in article<crspvet0fp3dndn2lq0qu59c6l1kcceo3h@4ax.com>:
https://www.washingtonpost.com/technology/2019/12/20/boeing-starliner-launch/
Paywall; article not read.
.
Boeing can't code.
Nah. I follow the story in Aviation Week. The problem is not bad coding
(although there is always bad code to be fixed), it´s that the requirements
were insufficient to the problem, and the people in Boeing that pointed that
out were ignored.
The most striking example of this is the decision to bet the airplane on the
correct operation of a single attitude sensor -- attitude sensors are
famously trouble-plagued.
Joe Gwinn
Hmmm- the French lost an Airbus with three angle of attack sensors. One was good, two were bad due to icing, and the voting scheme threw out the good reading and went with the two bad ones. Looks like you latched onto yet another flawed hypothesis. You can read about it here:
https://www.flightglobal.com/sensor-icing-caught-out-a320-crew-in-perpignan-crash/95893.article
I think you're referring to the A340 that went down off Brazil? If so,
most of that is wrong. It was not AOA related, it was the pitot tubes
that measure air speed that iced up. And the autopilot didn't decide to
trust any of the sensors. As it lost input, it backed off to alternate
flight rules to allow the autopilot to continue to fly the plane.
When it lost the last speed input it dumped the plane back into the hands
of the pilots. It was during turbulence in a thunderstorms, at night
and the pilots screwed up. The correct procedure was to set the power
at like 70%, maintain a certain nose up pitch and the plane would fly
just fine. One very good question there is why the autopilot didn't
default to simple method as the final step, instead of dumping it to the pilots.
This was another crash that shows how even trained pilots for a major
airline can screw up. I think one of the pilots was continuing to pull
back on the controls as the plane was stalled and heading to the sea.