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I was responding to the claim the flight control was averaging the two pilot inputs, because if that was the case then two pilots would have been flying the pla

by jussij 7y ago

I was responding to the claim the flight control was averaging the two pilot inputs, because if that was the case then two pilots would have been flying the plane. Might point was I doubt that this was in fact happening and there was only ever one pilot in charge. > the Air France flight where the computer was receiving inputs from two pilots. The link and quotes I posted suggest that was not happening. The system was just ignoring the other pilot (and that was the designed fault) because it also failed to tell that other pilot he was being ignored.

foldr 7y ago
>because it also failed to tell that other pilot he was being ignored. It didn't fail to tell him. That's what the dual input alarm is for.
- jussij 7y ago
  I will have to take your word on this dual input alarm as I have not read or seen any details on this alarm. Now if that alarm was raised then that suggests both pilots were in error as they both seemed to have ignore that alarm. However that was never the reason for my original reply. All I was replying to was idea that the flight control was doing some sort of averaging of the two pilot inputs. That to me just seems illogical as it would asume two pilots trying to fly the same plane and that scenario will never end well.
  - foldr 7y ago
    >Now if that alarm The sounding of the alarm is in the transcripts in the accident report. The Airbus does average the inputs if both pilots are making inputs at the same time.
    - jussij 7y ago
      > The Airbus does average the inputs if both pilots are making inputs at the same time. Do you have a url/link/pdf that describes this behaviour?
      - foldr 7y ago
        https://safetyfirst.airbus.com/app/themes/mh_newsdesk/documents/archives/dual-side-stick-inputs.pdf https://safetyfirst.airbus.com/app/themes/mh_newsdesk/docume... "When both sticks are moved simultaneously, the system adds the signals of both pilots algebraically."
        jussij 7y ago
        Thanks for the link. It is a very interesting read. In particular it also says this: To avoid both signals being added by the system, a priority P/B is provided on each stick. By pressing this button, a pilot may cancel the inputs of the other pilot. From this link: https://en.wikipedia.org/wiki/Air_France_Flight_447 https://en.wikipedia.org/wiki/Air_France_Flight_447 As pilot flying, Bonin took control of the aircraft via the side stick priority button and said, "I have the controls." Which again suggests at least in this case, Bonin was the only one flying the aircraft.
        foldr 7y ago
        Yes, indeed, I have not found any reliable source for the claim that both pilots were making significant stick inputs simultaneously for any extended period of time.

by jussij 7y ago

foldr 7y ago

>because it also failed to tell that other pilot he was being ignored. It didn't fail to tell him. That's what the dual input alarm is for.

jussij 7y ago
I will have to take your word on this dual input alarm as I have not read or seen any details on this alarm. Now if that alarm was raised then that suggests both pilots were in error as they both seemed to have ignore that alarm. However that was never the reason for my original reply. All I was replying to was idea that the flight control was doing some sort of averaging of the two pilot inputs. That to me just seems illogical as it would asume two pilots trying to fly the same plane and that scenario will never end well.
- foldr 7y ago
  >Now if that alarm The sounding of the alarm is in the transcripts in the accident report. The Airbus does average the inputs if both pilots are making inputs at the same time.
  - jussij 7y ago
    > The Airbus does average the inputs if both pilots are making inputs at the same time. Do you have a url/link/pdf that describes this behaviour?
    - foldr 7y ago
      https://safetyfirst.airbus.com/app/themes/mh_newsdesk/documents/archives/dual-side-stick-inputs.pdf https://safetyfirst.airbus.com/app/themes/mh_newsdesk/docume... "When both sticks are moved simultaneously, the system adds the signals of both pilots algebraically."
      - jussij 7y ago
        Thanks for the link. It is a very interesting read. In particular it also says this: To avoid both signals being added by the system, a priority P/B is provided on each stick. By pressing this button, a pilot may cancel the inputs of the other pilot. From this link: https://en.wikipedia.org/wiki/Air_France_Flight_447 https://en.wikipedia.org/wiki/Air_France_Flight_447 As pilot flying, Bonin took control of the aircraft via the side stick priority button and said, "I have the controls." Which again suggests at least in this case, Bonin was the only one flying the aircraft.
        foldr 7y ago
        Yes, indeed, I have not found any reliable source for the claim that both pilots were making significant stick inputs simultaneously for any extended period of time.