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Started By
Message
re: Boeing Reportedly Will Warn That the 737 Max Can 'Abruptly Dive' by Mistake
Posted on 11/7/18 at 9:08 am to Jim Rockford
Posted on 11/7/18 at 9:08 am to Jim Rockford
quote:
Increasingly complex systems do increasingly unpredictable things.
Stick pushers aren't new technology, though. They've been around for decades and are very mature technology on airliners.
1
Posted on 11/7/18 at 9:09 am to EST
quote:
I watched an Al Jazeera report about Boeing planes assembled in South Carolina as being unsafe because they are sacrificing quality to meet deadlines.
Probably a pro-union/SC hates union type story.
I bet Al Jazeera had nothing but glowing reviews of the Washington assembly plant.
This post was edited on 11/7/18 at 9:10 am
Posted on 11/7/18 at 9:10 am to just1dawg
quote:
Stick pushers aren't new technology, though. They've been around for decades and are very mature technology on airliners.
don't know about the max, but newer gen airliners are way past stick pushers, and obviously the fly by wire jets don't use that technology either
Posted on 11/7/18 at 10:17 am to brass2mouth
quote:
I take most of what the media says with a grain of salt but I can’t even muster a credible bone in my body for them.
Are you kidding? They are actually one of the better media sources out there.
Posted on 11/7/18 at 11:45 am to aileron
quote:
With autopilot off, the pilot is hand flying the airplane. The controls are hydraulically assisted but not computer controlled.
I believe that is incorrect. In manual flight, if the AoA sensor detects a nose too high stall, the computer will trim the elevators without pilot input causing the nose down pitch.
This is actually the concern of what happened to this flight. The pilots can over power the automatic elevator trim but it will repeat the trim every 10 seconds. The pilots must understand what is happening though.
Posted on 11/7/18 at 11:48 am to GeauxxxTigers23
quote:
If the plane “abruptly dove” due to some crazy flight monitoring software malfunction then the pilots should have simply turned off the autopilot and pulled up.
I think bad readings led to improper inputs.
Posted on 11/7/18 at 11:51 am to BHM
quote:
. In manual flight, if the AoA sensor detects a nose too high stall, the computer will trim the elevators without pilot input causing the nose down pitch.
correct, and again, not familiar with the max, but using airbus as an example, the solution is to take the computers out of the equation to give you an old fashioned airplane to fly
Posted on 11/7/18 at 11:54 am to Longstreet
Why the pilots didn’t disengage the autopilot is beyond me. Or at least they did it too late.
Posted on 11/7/18 at 11:55 am to jcaz
quote:
Why the pilots didn’t disengage the autopilot is beyond me.
not necessarily the solution in a lot of modern jets
Posted on 11/7/18 at 12:00 pm to 777Tiger
I’d be curious to see the positioning of the flight director. Plane senses stall due to false high AoA reading so nose dives to compensate for airspeed?
Posted on 11/7/18 at 12:01 pm to Tempratt
quote:
Weren't there 2 accidents with 737's years back
I recall something like that as well with a couple of earlier gen 737's. Something about while descending and coming close to final approach and a little jet wash from planes in front of them caused them to get stuck and crash....I think 2 of them crashed and the FAA couldn't figure it out and a 3rd one the pilot recovered and they identified the problem.
Posted on 11/7/18 at 12:03 pm to jcaz
quote:
Plane senses stall due to false high AoA reading so nose dives to compensate for airspeed?
could have been an undue activation of protection by the flight control computer(s) due to erroneous interpretation of AoA position
This post was edited on 11/7/18 at 12:26 pm
Posted on 11/7/18 at 12:06 pm to geaux88
quote:
Weren't there 2 accidents with 737's years back
quote:
I recall something like that as well with a couple of earlier gen 737's.
those were rudder hard overs caused by defective PCUs
Posted on 11/7/18 at 1:42 pm to jcaz
quote:
Why the pilots didn’t disengage the autopilot
This particular issue happens when autopilot is off.
Posted on 11/7/18 at 2:36 pm to 777Tiger
I remember watching that air emergency (I think that’s the show name?) then having to get on a 737 the next day 
Posted on 11/7/18 at 3:10 pm to jbgleason
quote:
Story came out after the bell. You can look up a stock price and can’t look that up? Get back to me tomorrow afternoon
Boeing's stock closed at $372 today. Up $5.
Hope you didn't drop all your shares, Warren.
Posted on 11/7/18 at 3:14 pm to 777Tiger
I want to say that those were in Colorado Springs and Pittsburgh and the crashes weren't very far apart?
If you want you can listen to the audio of the cockpit recorder in the Pittsburgh crash USAir Flight 427 on youtube.
If you want you can listen to the audio of the cockpit recorder in the Pittsburgh crash USAir Flight 427 on youtube.
Posted on 11/7/18 at 3:51 pm to Tubedog13
quote:
want to say that those were in Colorado Springs and Pittsburgh and the crashes weren't very far apart?
yes, another in LaGuardia, on takeoff, same thing , rudder issues, Feds try to blame it on everything but the PCUs, but that's when they started fixing them
Posted on 11/7/18 at 7:40 pm to 777Tiger
Link below is a great video of a similar event and how pilots should react. Video shows a simulator of a runaway stabilizer which is similar to the recommended stabilizer issue being discussed.
The two pilots should have noticed the trim wheels spinning as the plane was trying to prevent what it thought was a stall. I am convinced that this plane did not crash simply due to the AoA false reading and subsequent nose down pitch.
youtube.com
The two pilots should have noticed the trim wheels spinning as the plane was trying to prevent what it thought was a stall. I am convinced that this plane did not crash simply due to the AoA false reading and subsequent nose down pitch.
youtube.com
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