AF 447 Thread no. 4

[RR_NDB]

Adequate redundancy (always under K.I.S.S. constraints)

Engines have only 2 channels for control, 2 sensors for each parameter; B777 has only 2 AOA vanes fitted.

What happened with redundancy here? even more 'ridiculous' design or clever engineering?

A33Zab, the point is: We must consider in the System design (a/c+crew operation) everything to avoid going straight from "Normal Law" to "Murphy´s Law"

And remember, i am against the (ridiculous) redundancy (wrongly applied) when critical System elements are prone to fail simultaneously. Your examples doesn´t fit in this category. And even if this occur, you can save the day in most of cases. (Looking to your question, BA 38 and FLT 1549 came to my mind)

PA 18 151 mostly in here and here