Miscellaneous News

vincent said:

Nope, it is unstable at high AOA. The plane will pitch up by itself at certain high AOA

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This is often repeated but entirely wrong.

The Max is NEVER unstable under any condition. The pitch moment coefficent is more and more negative as AOA increases, just like all stable aircraft. Although it is not as stable as previous 737. MCAS just makes it feel the same as all other 737, reducing training.

Too little information to make any conclusion. At the moment, everything is just speculation.
The plane was cruising at an altitude of 29,100 feet when, in just over a minute, it lost more than 21,000 feet. It appeared to briefly regain altitude around 8,000 feet before continuing its plunge, according to Flightradar24’s data.

KYli said:

Too little information to make any conclusion. At the moment, everything is just speculation.

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The plane was cruising at an altitude of 29,100 feet when, in just over a minute, it lost more than 21,000 feet. It appeared to briefly regain altitude around 8,000 feet before continuing its plunge, according to Flightradar24’s data.

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Get the Black Box, analyze it properly -- hopefully China can do it in-house to avoid any info tampering possibility if done outside, then the cause of the crash may be known. Until more info is made available, all talks are more speculative in nature.

Hopefully COMAC C919 will proceed with good speed as to take over gradually the domestic flights one day.

RIP all the victims!

JebKerman said:

This is often repeated but entirely wrong.

The Max is NEVER unstable under any condition. The pitch moment coefficent is more and more negative as AOA increases, just like all stable aircraft. Although it is not as stable as previous 737. MCAS just makes it feel the same as all other 737, reducing training.

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An unstable aircraft will pitch/turn/roll without the Pilot giving it a command to pitch/turn/roll. I have flow such aircraft and when they start to depart it happens fast. You have to counter the move with a quick and large push on the controls.

In the MAX case, the additional pull in pounds-force to get the nose to a higher pitch Angle of Attack (AoA) was not linear close to stall AoAs. Let’s say it was 4 lbs per additional AoA in the normal flight regime and reduced to 2lbs for the last degrees before the stall.

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The plane pitches up more than the pilot wanted

windsclouds2030 said:

Get the Black Box, analyze it properly

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It is difficult to say if the black box managed to even survive this. I wouldn't be so sure that it remained intact

Graph of the decent from the dailymail

KYli said:

Too little information to make any conclusion. At the moment, everything is just speculation.

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The plane was cruising at an altitude of 29,100 feet when, in just over a minute, it lost more than 21,000 feet. It appeared to briefly regain altitude around 8,000 feet before continuing its plunge, according to Flightradar24’s data.

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So it's powered dive from 29K to 8K altitude? IIRC, it takes more than 3 minutes (!!) to free fall from 30,000 feet.

Edit: Just googled, terminal velocity is 54m/s, and the plane dived at 100m/s!

A break from the very sad news of the Chinese aircraft crashing, and the 132 victims that have perished along the way.

I want to post this segment of documentary piece made by M. Moore about the ILLEGAL IRAQ INVASION of 2003. Watching this does really confirm my belief that western people (America, Europe, Australia, New Zealand, Japan) have memories of a gold fish. And they lack any sense or regret, or be introspective about their pasts destructive, genocidal actions, not to mention their GIANT HYPNOSIS, AND HYPOCRISY.

Right now, everyone in the west are crying crocodile tears for the people of Ukraine when if they as a supposed members of higher order of people would have the ability to push their leaders to have made the right thing and not push Ukraine for NATO expansion so none of this dumb war would have happened. But such intellectual maturity, respect for one's adversary/strategic rival whatever they like to call it is virtually impossible since America, and the collective west have been giga-brainwashed to be taught that their way is universal (universal values) and that those who oppose them are equal if not, greater than Hitler.

HeiTangSeng said:

So it's powered dive from 29K to 8K altitude? IIRC, it takes more than 3 minutes (!!) to free fall from 30,000 feet.

Edit: Just googled, terminal velocity is 54m/s, and the plane dived at 100m/s!

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2 things.
Either pilot suicide,
Or complete and utter failure of all airplane's critical systems

There is no other explanation for how the plane would descent so suddenly. Whatever the reason, the investigators will have a tough job and I am not even sure if the black box remained intact after such an impact

Overbom said:

2 things.
Either pilot suicide,
Or complete and utter failure of all airplane's critical systems

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It's a powered dive if the flight tracking data is correct. Even everything fails and falls off the fuselage, it will take more than 3 minutes to hit the ground.

China Eastern's 737NGs have been grounded, but the ban is not across the board in China. I guess the investigators already have a good idea of how it happened. They are looking for the why.