Live data from Hacker News

What Really Brought Down the Boeing 737 Max?

nytimes.com

41–44 of 44 posts

Re: What Really Brought Down the Boeing 737 Max?

#41
post #30

Can someone validate my thinking here, please? I’ve been watching this saga for a while and there is something that doesn’t seem to be said that really bothers me about this whole situation: the failure mode is negative, not neutral. Here is what I mean. An aircraft has a flight envelop that defines its flight characteristics. Not only does it define in how fast or slow or high it can operate, but how that operation…

> Everything I have ever seen is that the whole point of airplane design and pilot training is to reduce flight problems to known solutions as to resolve the problem as quickly as possible. The very design of MCAS is failure must put the pilot into an unknown position and likely be actively combating the pilot’s understand of the situation. If this logic is correct, I cannot fathom how any of this is acceptable.

This is the salient paragraph in this comment. It's ridiculous to blame pilots for figuring out recovery conditions when they can't be certain of the parameters in which they're operating.

Re: What Really Brought Down the Boeing 737 Max?

#42
A friend of mine wrote:

"I don't know whether you recognized the name of the author. He is a well-known aviation writer and journalist, and the son of Wolfgang Langeweische, author of the book Stick and Rudder. Stick and Rudder has been the bible for pilots of how planes fly since its publication in the 1940s."

Re: What Really Brought Down the Boeing 737 Max?

#43
post #29

Earlier quoted context omitted.

No... Not really. I mean, I agree with you to a point. There is a delight taken by manufacturers being able to ostensibly cut training costs. But in this case, the fact was the plane itself was unsoundly engineered. Even highly skilled pilots have failed to rescue the plane in a simulator. The pilot cannot be the primary carrier of blame when the equipment in the best hands available had only a 66% chance of having t…

You wrote "Even highly skilled pilots have failed to rescue the plane in a simulator". This is utter nonsense that you either made up or obtained from some unreliable source. It is categorically false. The third pilot in the jump seat "rescued" the Lion Air accident aircraft on the previous flight by simply telling the pilots to disengage the stabilizer trim. This "rescued" aircraft continued 600 miles safely to Jaka…

What you seem to mistakenly believe I'm referring to was the third pilot in the Lion Air penultimate flight. I was not, but it is a testament to good Crew Resource Management that he was able to pick out the right course of action when other pilots were not.

I'm referring to the test pilots test flying the original proposed software fix before they were forced to reclassify the FCC failure condition to catastrophic severity due to one of them not successfully saving the aircraft in a simulated single-event upset. Three pilots were tapped by the FAA to try to recover from a single event upset which would result in erroneous MCAS activation.

The two military pilots saved the plane. The civilian test pilot didn't, resulting in an elevation of failure in the FCC on which MCAS runs to catastrophic, requiring a fundamental redesign.

https://www.seattletimes.com/business/boeing-aerospace/newly...

I assume the Seattle Times is an acceptable source?

>You know nothing and yet you have opinions, and this is now universally accepted. You are therefore easily manipulated by those who would blame Boeing instead of the gross and egregious negligence of the pilots, those who trained them, the airline owners and executives, and the market conditions that forced Boeing to make decisions in good faith that incorrectly assumed a level of pilot competency that did not exist.

Okay. Just stop. I've been knee deep in the investigation and follow-up of these disasters since about March, and had honed in on the most likely root cause given a combination of information on motives (Southwest rebate), culture issues (McDonnell Douglas management strategy from their merger), fundamental hardware/software design (single AoA sensor, no cross-checking), basic aerodynamics (consequences of the engines on end behavior), test piloting (Royal Aeronautical Society, D. P. Davies interviews), experience with control systems, and research into regulatory minutiae.

Take a spin back through my comment history if you'd like. I was working on reverse engineering with only publically available information, and got to the right conclusions within about a month. Got to sit back and check conclusions off until the Seattle Times formally published their inside story in June. Suffice it to say, I'm probably the absolute last person you'd want to accuse of "not knowing anything and being manipulable". The 737 MAX MCAS fiasco was an absolute travesty from the get go, and any competent computer scientist would have told them that a computer handling such a critical function must be very carefully designed, programmed, and clearly communicated to the end user.

I'm very opinionated in this case, mainly because I've taken the time to become informed enough to truly comprehend how badly Boeing screwed the pooch. And considering they've had whistleblower testimony that the single AoA sensor, no cross-check decision was made specifically to avoid having the FAA refuse to certify the plane on time, that eliminates the idea this was "good-faith", as good-faith would have been honoring your responsibility to the public to design a fundamentally safe and well documented aircraft in full compliance with all regulations.

Whistleblower testimony first mentioned here, in a 60 Minutes Expose on the MAX.

https://m.youtube.com/watch?v=QytfYyHmxtc.

Thank you muchly, sir, and kindly take your misinformed speculation about my subject area knowledge elsewhere. It's my business to know why things fail, even if everyone involved is trying to do their best from keeping me from finding it. Physics don't lie. People, and especially businesses with everything on the line, on the other hand, do.

I have a great deal of respect for pilots, but I'm enough of an engineer to know when someone is putting an operator in serious danger. Boeing checked ALL the boxes.

I've said my piece. Good day, sir.

Re: What Really Brought Down the Boeing 737 Max?

#44

Why was this flagged? It is a detailed New York Times article by a respected aviation journalist. Its opinionated reporting but I was looking forward to the Hacker News discussion.

I agree. I'm guessing that, at least for many folks, they didn't know the context, and assumed that the more positive statements are the result of naivete or ignorance.
Post reply on HN