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Sensor damaged by a foreign object on Ethiopian Airlines 737 MAX triggered fatal crash
Posted on 4/4/19 at 12:54 am
Posted on 4/4/19 at 12:54 am
quote:
The Ethiopian Airlines Boeing 737 MAX, which crashed in March and killed 157 people, suffered a damaged angle-of-attack sensor upon takeoff from a bird or foreign object, triggering erroneous data and the activation an anti-stall system -- called MCAS -- sending the pitch of the plane downward and ultimately crashing into the ground, two aviation sources familiar with the investigation told ABC News.
As the jet was nose diving, the Boeing 737 MAX pilots did not try to electronically pull the nose of the plane up before following Boeing's emergency procedures of disengaging power to the horizontal stabilizer on the rear of the aircraft, according to the sources.
One source told ABC News that they manually attempted to bring the nose of the plane back up by using the trim wheel. Soon after, the pilots restored power to the horizontal stabilizer.
With power restored, the MCAS was re-engaged, the sources said, and the pilots were unable to regain control and the plane crashed.
The preliminary findings in the crash investigation are expected to be released by transportation officials in Ethiopia on Thursday morning.
LINK
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Posted on 4/4/19 at 1:03 am to RollTide1987
Ha. Knew it was something else.
Posted on 4/4/19 at 1:28 am to RollTide1987
Not that I’m doubting the story, but I’m always fascinated at how they can determine parts of a plane were damaged prior to violently slamming into the earth.
Posted on 4/4/19 at 1:41 am to RummelTiger
Was wondering the exact same thing. Video footage?
Posted on 4/4/19 at 1:50 am to Shiftyplus1
quote:
Ha. Knew it was something else.
Something other than what? It was still the MCAS system that led to the crash. Something wrong with one sensor caused the system to essentially fly the plane into the ground.
Posted on 4/4/19 at 1:52 am to RollTide1987
This sounds like a whole bunch of BS to keep an international incident from occurring
Posted on 4/4/19 at 2:20 am to RollTide1987
Can’t help but think this would be like a car crashing from something knocking a mirror off. Birds are here to stay.
This has got to be a bad design/system.
This has got to be a bad design/system.
Posted on 4/4/19 at 3:18 am to RollTide1987
Can I ask the basic question if is MCAS trying to solve a problem that didn’t exist?
Posted on 4/4/19 at 3:35 am to RollTide1987
Step 1 to surviving a plane crash: Avoid flying on any airline whose name makes you ask "Who the frick would fly there?"
Case in point.
quote:
Ethiopian Airlines
Case in point.
Posted on 4/4/19 at 4:22 am to Muthsera
Ethiopian Airlines has one of the best overall safety records of all companies in the industry.
Posted on 4/4/19 at 4:41 am to RollTide1987
Is a planes ability to make a successful flight really that reliant on this one sensor being functional? It seems a plane/pilot should have the ability to overcome this sensor being taken out especially if it can be taken out by a bird or ice or whatnot.
Posted on 4/4/19 at 4:44 am to roguetiger15
K...Keep Me Posted
Posted on 4/4/19 at 4:48 am to Muthsera
Hmmm, 1+1=3
Posted on 4/4/19 at 4:49 am to RummelTiger
quote:
Not that I’m doubting the story, but I’m always fascinated at how they can determine parts of a plane were damaged prior to violently slamming into the earth.
I’m assuming it’s not just based from physical data, but from reconstructing the flight profile from all of the sensors and seeing the AoA readings not match up.
Posted on 4/4/19 at 4:52 am to tigerinthebayou
quote:
Is a planes ability to make a successful flight really that reliant on this one sensor being functional?
The problem is that the plane isn’t really being flown by the pilot. It’s flown by a computer that even in manual mode just take general direction from the pilot.
So what the control surfaces actually do is dictated by both pilot input and what the system views the current situation as.
Depending on the programming, that mix with a faulty sensor could lead to counterintuitive responses.
This post was edited on 4/4/19 at 4:53 am
Posted on 4/4/19 at 5:02 am to Volvagia
quote:
The problem is that the plane isn’t really being flown by the pilot. It’s flown by a computer that even in manual mode just take general direction from the pilot. So what the control surfaces actually do is dictated by both pilot input and what the system views the current situation as. Depending on the programming, that mix with a faulty sensor could lead to counterintuitive responses.
Not to derail the thread, but this is exactly why I don’t see 100% autonomous cars ever being a thing. An alert driver/pilot must be there to take over control should the technology fail.
If a 100 million dollar plane can’t work autonomously, then it will never be economically possible in a car that is affordable to the masses.
Posted on 4/4/19 at 5:07 am to RummelTiger
quote:
..fascinated at how they can determine parts of a plane were damaged prior to violently slamming into the earth.
I've always thought that being an air crash investigator would be fascinating and depressing job to have.
Posted on 4/4/19 at 5:33 am to Kimist
quote:
Something wrong with one sensor caused the system to essentially fly the plane into the ground.
Solid fail safe plan
Posted on 4/4/19 at 5:34 am to MikeBRLA
quote:
Not to derail the thread, but this is exactly why I don’t see 100% autonomous cars ever being a thing. An alert driver/pilot must be there to take over control should the technology fail.
But on the other side, the technology in the manner I described has been in place for nearly 40 years. Its not like what you are seeing now is the product of getting the bugs out of a new product.
And performing a similar function in a car is massively different from a plane. The car doesn’t have to track the craft in 3 dimentional space, monitor environmental conditions, monitor car’s response to environmental conditions, analyze difference between expected and actual values to extrapolate condition of the craft, use this value in future calculations....etc etc, and if it doesn’t do all this correctly the car crashes.
Additionally logically think about what you said. How many people die every day from careless/distracted driving daily? Hundreds? Including fender benders, do you think the number of incident rate reaches a thousand daily?
And you are pointing to an example that has occurred fewer than a dozen times in 30 years with tens of thousands of flights as the reason autonomous driving won’t ever get essentially universally adopted? Are you equating the driving ability of a flight captain with a methhead?
Posted on 4/4/19 at 5:39 am to RollTide1987
So its a software issue.
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