PPRuNe Forums - View Single Post - A320 unreliable speed . . . only if you are a nerd like me
Old 14th Dec 2015, 11:20
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sonicbum
 
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Originally Posted by C_Star
i'm not sure if your scenario is possible in real a/c. However, two things should be noted here:

- Hi AoA protection has priority over high speed protection, so you shouldn't stall as long as you stay in Normal Law.

- switching off 2 ADR's is sufficient to force Alternate Law. While it's is not the procedure for UAS (it is for the spurious AoA port), I think it's quite justified in your scenario- after all, you have to stabilize the path first, then troubleshoot...
I also believe that it is extremely unlikely that 2 speed indications are erroneous by exactly the same magnitude leading to an undetected condition that unfolds as you have described. I am honestly not 100% sure on how many cases of unreliable speed indication have occurred in that same exact context, but I believe none.
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