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-   -   B777 Airspeed Unreliable (https://www.pprune.org/tech-log/649228-b777-airspeed-unreliable.html)

FlyingGourmet 6th October 2022 03:21
B777 Airspeed Unreliable
 
Hey Folks,

in the FCOM 2 it states that the GS indication on the ND comes from the ADIRU but in the Airspeed Unreliable NNC it says that the Ground Speed is reliable. From there exactly comes the info and where can I read it in detail?

thanks

8che 6th October 2022 23:58
Originally Posted by FlyingGourmet (Post 11308800)
Hey Folks,

in the FCOM 2 it states that the GS indication on the ND comes from the ADIRU but in the Airspeed Unreliable NNC it says that the Ground Speed is reliable. From there exactly comes the info and where can I read it in detail?

thanks

Think of the ADIRU as the AD + IRU.

With unreliable airspeed the AD part is affected.
It is the IRU part that delivers G/S and so remains unaffected (to the required extent at least)


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