Ethiopian 737 MAX 8 crash
#301
Gets Weekends Off
Joined APC: Jun 2017
Posts: 659
What would of happened if they left the flaps down longer, 1-3000’+ AGL, and done much of the climbout without the autopilot? Of course we’ll naturally keep that nose parked up to control airspeed.
Those 2 things and we wouldn’t be talking about this.
I know, hindsite is easy.
Those 2 things and we wouldn’t be talking about this.
I know, hindsite is easy.
The flight the night before the Lion Ait crash had stick shaker start at rotation, with associated stall warnings which leads one to believe the airspeed is unreliable. Once they climbed away and raised the flaps, MCAS started trimming nose down. The crew the night before used the stab trim cutout switches and landed.
#302
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Joined APC: Jan 2006
Posts: 222
Seems like a bigger horizontal stabilizer with a bigger elevator or maybe replace both with a stabilator would be the definitive fix. The first would be expensive, the second really expensive, but either solution would be cheaper than what is going to be spent resolving these two accidents. Saying you are going to fix the problem by wiring in another AOA indicator and adding some more software just seems unacceptable.
When Beech was developing the King Air series throughout the years the FAA required three separate Type Certificates as the models grew and became more complex. Maybe the MAX needs to start from scratch.
When Beech was developing the King Air series throughout the years the FAA required three separate Type Certificates as the models grew and became more complex. Maybe the MAX needs to start from scratch.
#303
#304
Software update to the MCAS is like a band-aid solution for a band-aid solution. The 737 has grown too much to fit in the original type, IMO. The elevator should be redesigned to be able to overpower the full nose down stab trim as well as full nose up stab trim in a stall. Then there is no need for MCAS.
Dollars to donuts they come up with a better bandaid.
#305
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Joined APC: Nov 2008
Position: UnemploymentJet
Posts: 313
#306
"All we can say definitely is that the trim was in a position similar to the position found on the Lion Air airplane"
So if not full down, seriously out of trim in the nose down direction, of a magnitude known to have caused the plane to crash once before.
#307
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Joined APC: Mar 2014
Posts: 281
At one time Boeing was looking at developing a lighter weight 757. Think the number of passengers was to be about the same as the MAX is now. Not sure the MAX is really fixable without major airframe design changes. By the time you made those changes you would have.......a lighter weight 757.
#308
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Joined APC: Jun 2017
Posts: 659
At one time Boeing was looking at developing a lighter weight 757. Think the number of passengers was to be about the same as the MAX is now. Not sure the MAX is really fixable without major airframe design changes. By the time you made those changes you would have.......a lighter weight 757.
But hey maybe you’re right and they’ll test and then retrofit new wings, landing gear, tail, and cockpit onto hundreds of planes to make “a lighter weight 757”.
#309
My guess:
1. Comparator logic, so that MCAS uses data from BOTH AoA vanes. In the event of disagreement, it would either be inhibited, or an alert. Possibly a disable-switch added.
2. Mandatory sim-training where the MCAS runs away.
3. I think it will happen in phases. AoA mod will happen quickly...I believe it’s there, just needs to be modded in the software.
A disable switch would take a year to get delivered airplanes modded. New would include it.
Sim training: they’ll give them six months to train everyone.
Flying again by May 15.
Just a guess.
1. Comparator logic, so that MCAS uses data from BOTH AoA vanes. In the event of disagreement, it would either be inhibited, or an alert. Possibly a disable-switch added.
2. Mandatory sim-training where the MCAS runs away.
3. I think it will happen in phases. AoA mod will happen quickly...I believe it’s there, just needs to be modded in the software.
A disable switch would take a year to get delivered airplanes modded. New would include it.
Sim training: they’ll give them six months to train everyone.
Flying again by May 15.
Just a guess.
#310
At one time Boeing was looking at developing a lighter weight 757. Think the number of passengers was to be about the same as the MAX is now. Not sure the MAX is really fixable without major airframe design changes. By the time you made those changes you would have.......a lighter weight 757.
Still not clear if the NMA will even be launched, but it's looking highly possible in the next year.
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