Originally Posted by
PerfInit
From what I read in the report, The OEM floated the idea of synthetic airspeed for the Max but realized quickly that due to “new & novel” language in Part 25 Cert rules, this would delay the cert and jeopardize their plan of “minimal training differences (Level B) between NG and Max.
Lessons learned the hard way drive stringent regulation and oversight bureaucracy in aviation... the flip side of that is that it naturally slows technical progress. The only reason we're getting new alternatives to our ASEL motors designed in the 1940's is because of leaded gas and environmental pressure.
Originally Posted by
PerfInit
The ADIRUs provide HDG/Groundspeed display to the ISDU on the overhead. Not stated in the NNC for Unreliable Airspeed explicitly, but this could be useful information if the pilots know where to find it and how it is determined.
Could be useful for triage on instrument disagreements... if you have the presence of mind to use it in the heat of battle. I'd hate to have to fly the plane by reference to the overhead panel though. Unless you had a jumpseater who could call out the parameters for you.