solune wrote:At this point, I find that hinting even in passing that the pilots might have been partially responsible for this is giving too much credit to Boeing.
They made a bad hardware. They tried to fix it with a bad software. They tried to fix that with a user manual. This kind of mentality needs to stop.
The fault lies entirely with Boeing but what I wrote is still correct. The mitigation they had for a single failure leading to a hazardous aircraft condition was that the pilots could override it. This is an acceptable mitigation...IF YOU TELL PEOPLE ABOUT IT. That the pilots should have recognized this new failure mode and used an existing emergency procedure to counter-act it (treat it as a runaway trim scenario) is ridiculous without any training or information TELLING the pilots about this new feature.
Had this been declared to pilots and the appropriate training mandated, it still wouldn't have been a optimal system (IMO but to be fair I don't know all their fault trees), but it would have met appropriate safety guidelines.
The fact this new plane didn't need new training was one of the reasons it was bought.
This is a 1967 airplane design with hacks. It is a 1967 airplane because so long as they can pretend it is the same airplane, you don't have to do recertification/get training to fly it. This makes it cheap for airlines to purchase, and use their existing set of expert 737 pilots on it.
50 years of improved technology is stapled onto the 1967 design in order to give it the performance characteristics it needs to compete.
But the performance characteristics it needs needed bigger engines. Which require wing redesign and higher ground clearance, or just shove them up higher and add a hack to deal with the fact that the thrust is now in a crazy-ass spot that can lead to sudden stalls.
Thus the hack; because the airplane can go from seemingly normal flight to an unrecoverable stall, they added in a hack that makes it FORCE THE NOSE DOWN before the unrecoverable stall point is reached. This is because the airplane flies fundamentally different than any 737, and they are pretending that it can be flown by a 737 pilot.
But then they only have one sensor for the FORCE THE NOSE DOWN action, they strip the "sensor malfunction" light out of the base kit to see as an add-on (it is a military grade sensor!), and they state that as a 737 pilots don't need any new training about any new failure modes.
And planes drop out of the sky.