AF 447 Thread no. 4

[RR_NDB]

"Managing and handling" advanced Systems (Human machine interfacing issue)

What is not clear when output is ECAM message: F/CTL ALTN LAW (PROT LOST) MAX SPEED……330/.82 (actual values depend on configuration).>>> Nothing,

The System "output": Data (displays, aural info, etc.) and inputs to a/c flying surfaces (e.g. to THS, etc.) must be easily (and very fast) understood and understandable by the crew. It´s absolutely necessary an interface designed to present in real time a clear and reliable "picture" of "what´s going on" (and changing) in the plane.

How would you suggest presenting this more clearly to crew? >>> In similar cases, UAS (reason for Law change)

If you are referring to the intermittent STALLSTALL, I fully agree this should have never been silenced when AOA was above the threshold value whether speed was valid or not. >>> I am referring to all System outputs that could difficult (and dangerously, delay) proper and fast crew actions.

And also even potentially creating "extra CRM issues".

the system doesn’t make up the inputs itself >>> When System changes its mode (for any reason) it´s "doing an input" (it´s "changing" the plane.). And this could be subject of improvements. I´ll repeat: Airbus SAS share of responsibility in dealing with this effort is an opportunity for the company that introduced the commercial "advanced planes"...

The crews, "Redundant Systems, operators" always must "have chances" to "keep flying" their increasingly complex, and not perfect (never will be), machines. AoA indication is vital (considering you can stall a´bus )

My comments are not just on AF447 case. Other incidents/accidents can be related to these issues. And are not for just A (or B) but for "advanced planes", an important, "powerful" (and evolving )trend.