You see that’s absolutely NOT TRUE!
The flight before the FIRST crash, LION AIR FLIGHT 43, the aircraft had the MCAS problem and the crew used the STAB CUTOFF procedures to help control the aircraft. Clearly there was a problem. However, the NEXT FLIGHT of that aircraft was the crash (LT 610).
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Preliminary investigations revealed serious
flight control problems that traumatized passengers and crew on the aircraft's previous flight, as well as signs of
Angle of attack (AoA) sensor and other instrument failures on that and previous flights, tied to a design flaw involving the
Maneuvering Characteristics Augmentation System(MCAS) of the 737 MAX series. As a result, the United States
Federal Aviation Administration and
Boeingissued warnings and training advisories to all operators of the 737 MAX series to avoid letting the MCAS cause an abrupt
dive similar to the Lion Air flight.
These advisories were not fully implemented, however, and the design issues are suspected to be involved in the
Ethiopian Airlines Flight 302 crash on 10 March 2019, prompting a
worldwide grounding of all 737 MAX aircraft.
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I’m not giving Boeing a free pass, either, because not including MCAS in the Differences, for fear of requiring actual, REAL TRAINING by airlines, is a disgrace.
As a 737 Captain for over a decade, I have flown the -300, -500, -700, -800, 900(ER), and the MAX variants. They ALL have their foibles and require a significantly thicker Aircraft Flight Manual than most aircraft. Fewer things are automated and the various models have slightly different systems, so explaining MCAS wouldn’t have been a big thing, BUT THE AIRLINES WANTED A ZERO DAY TRAINING FOOTPRINT, and thus “MAX training” was a CBT module. In short, a PowerPoint with questions!
I have a big problem with THAT! However, we knew “the fix” very, very early on, and the OLD 737 manuals even had a MANUAL PROCEDURE for this same type of problem on the first variants. The difference this time is they actually BUILT-IN the “INVISIBLE” use of a potentially deadly system that, if activated due to failure, would present a very confusing aural and visual cacophony to be overcome as you seek to pinpoint the problem and then affirmatively address it.
We are deep in the weeds now, so I’ll butt out. However, I didn’t want to leave your erroneous assertions to go unchallenged.
Safety First!