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-   -   B737MAX Recertification - Archive (https://www.flyertalk.com/forum/united-airlines-mileageplus/2031779-b737max-recertification-archive.html)

DenverBrian Apr 4, 2019 7:10 pm


Originally Posted by FlyngSvyr (Post 30966050)
What did you expect them to do? Disavow any responsibility?

I expected them to stall and say the planes were safe like they did after the first 189 people died. I kind of expected them to slapdash a software "fix" to get the planes rolling off the assembly line again, and only a third crash killing 150-200 would have actually, finally, sunk in.

I want my airplane manufacturers to lean forward and be proactive. <shrugs>

BF263533 Apr 4, 2019 7:36 pm


Originally Posted by DenverBrian (Post 30966234)
I expected them to stall and say the planes were safe like they did after the first 189 people died. I kind of expected them to slapdash a software "fix" to get the planes rolling off the assembly line again, and only a third crash killing 150-200 would have actually, finally, sunk in.

I want my airplane manufacturers to lean forward and be proactive. <shrugs>

Isn't Boeing going for just a software fix? Sure there will be training, but no statement that they will retest stability and any lift issues at high aoa's. If Boeing felt a very robust MCAS was needed & could not be individually disabled, there must have been some significant factors driving their initial decisions. By admitting liability, providing new software and providing for training, they are cutting off a lot of discovery and investigation into causation.

AirbusFan2B Apr 4, 2019 7:48 pm


Originally Posted by BF263533 (Post 30966286)
Isn't Boeing going for just a software fix? Sure there will be training, but no statement that they will retest stability and any lift issues at high aoa's. If Boeing felt a very robust MCAS was needed & could not be individually disabled, there must have been some significant factors driving their initial decisions. By admitting liability, providing new software and providing for training, they are cutting off a lot of discovery and investigation into causation.

Boeing’s admission of guilt is helpful though overdue. Many things went wrong here from design to regulatory approval. And now questions are emerging about other features with the aircraft. I’d be most comfortable with a full review of the MAX’s airworthiness rather than the previous, chummy Boeing-FAA summary version.

username Apr 4, 2019 10:24 pm


Originally Posted by DenverBrian (Post 30965681)
Boeing finally, finally, moves in front with this apology and admission of responsibility.

https://www.usatoday.com/story/news/...ng/3361880002/

They did not move in front. They are way way way behind, just ahead of Jussie Smollett.


Originally Posted by FlyngSvyr (Post 30966050)
What did you expect them to do?...


Originally Posted by DenverBrian (Post 30966234)
I expected them to stall and say the planes were safe like they did after the first 189 people died...

...and as late as 3/18...https://boeing.mediaroom.com/2019-03...tion-Community

In addition to the human tolls, this shows how screwed up the company is - with design, with the arrogant attitude, with crisis handling, with integrity and ethics...did they think they could get away with this?

It will be interesting to see what happens at the annual shareholder's meeting later this month. It seems the company really needs a change of leadership.

jmastron Apr 4, 2019 11:03 pm


Originally Posted by rdchen (Post 30964860)
So if the ET pilots first used the thumb trim switch to counter the malfunctioning​​​​​​ MCAS, then cutoff the electric trim switches, the end result might be different?


Originally Posted by LarryJ (Post 30965538)
That's how I would do it and is consistent with the information contained in today's preliminary report.

Do we know if MCAS stops trimming down during the entire time the pilot is holding the electric trim switch (only starting up 5 seconds after the pilot stops), or if it stops for 5 seconds then restarts regardless of whether the trim switch is still being used? That's a critical detail, and I suspect the latter. Does anyone have the full instructions/procedures that Boeing (finally) gave out? Separately, does MCAS turn the trim at a higher or lower *rate* than the electric trim switches?


Originally Posted by n198ua (Post 30965988)
So if you lockout the jackscrew in full nose-down orientation, how long would it take to manually adjust it to a neutral flying position ?

My understanding from both statements here and watching some videos of runaway stabilizer trim is that from full nose-down: A long time to spin the manual wheel back, longer than you might have at only a couple thousand feet AGL, AND requiring a lot more force than even two pilots might be able to leverage, given they would have had to also apply significant then later overwhelming force to also hold back the yoke in the meantime. Which I suspect is what led the ET crew in desperation, out of other options, to try turning the electric trim back on, praying it worked the first way above.

worldclubber Apr 4, 2019 11:08 pm


Originally Posted by username (Post 30966621)
In addition to the human tolls, this shows how screwed up the company is - with design, with the arrogant attitude, with crisis handling, with integrity and ethics...did they think they could get away with this?

Unfortunately, the answer is yes.

„arrogant attitude“ is one of the main problems at Boeing. Witnessed this many times ...

cesco.g Apr 4, 2019 11:15 pm

Re the 777-X mentioned further up: Is that design also sold as "same like older 777 models - no significant pilot retraining required" ??

BF263533 Apr 5, 2019 12:22 am


Originally Posted by cesco.g (Post 30966711)
Re the 777-X mentioned further up: Is that design also sold as "same like older 777 models - no significant pilot retraining required" ??

Also, is this another airframe being stretched and re-engined at the limits of safety for the sake of profits and fuel efficiency?

username Apr 5, 2019 12:57 am


Originally Posted by jmastron (Post 30966683)
...My understanding from both statements here and watching some videos of runaway stabilizer trim is that from full nose-down: A long time to spin the manual wheel back, longer than you might have at only a couple thousand feet AGL, AND requiring a lot more force than even two pilots might be able to leverage, given they would have had to also apply significant then later overwhelming force to also hold back the yoke in the meantime. Which I suspect is what led the ET crew in desperation, out of other options, to try turning the electric trim back on, praying it worked the first way above.

For those who say "how come they turned the power back on when the checklist did not say to do it", isn't the problem that even after the Lion Air crash and Boeing sort of told people about MCAS, Boeing did not go into how it works exactly (i.e. endless retries with more push each time)?

Even if the ET crew knew that, would it have been too late to recover after what MCAS did? This kind of reminds me of the NTSB hearing scene in "Sully" where multiple crews tried to get a better outcome than the Hudson and could not.

I still don't understand why Boeing designed it this way (never-ending retries and more severe each time - and seems like a design change last minute?) and it seems there is some bigger reason we don't know yet....

Then the lack of redundancy part.... The whole thing makes no sense and really makes you wonder.

I know some companies which try to get rid of more experienced engineers to save money run into experience gaps. Is Boeing suffering from that?

Maybe we should all feel safe now that the CEO risked his life to be on the test flight on Thursday?

fly18725 Apr 5, 2019 3:25 am


Originally Posted by BF263533 (Post 30966824)
Also, is this another airframe being stretched and re-engined at the limits of safety for the sake of profits and fuel efficiency?

It is generally safer to modify what is known then creating something new.

worldclubber Apr 5, 2019 6:27 am


Originally Posted by fly18725 (Post 30967149)
It is generally safer to modify what is known then creating something new.

Not necessarily. Creating something from scratch considering only parameters that are well-known to make a plane stable can be better than tweaking a known design to its limits to save money/fuel/...



DenverBrian Apr 5, 2019 6:32 am


Originally Posted by fly18725 (Post 30967149)
It is generally safer to modify what is known then creating something new.

CNN reporting that Boeing mandated that the MAX not require simulator training, saving $1M per plane.

This is all cost shaving. Now they'll pay far, far more in settlements and judgments for 350 innocent people who paid for their misplaced frugality with their lives.

Bear96 Apr 5, 2019 6:40 am


Originally Posted by DenverBrian (Post 30966234)
I expected them to stall and say the planes were safe like they did after the first 189 people died. I kind of expected them to slapdash a software "fix" to get the planes rolling off the assembly line again, and only a third crash killing 150-200 would have actually, finally, sunk in.

I want my airplane manufacturers to lean forward and be proactive. <shrugs>

They are being proactive - about their future sales.

Looking ahead long-term, they know that most transport aircraft deliveries will be to non-US / "third-world" countries / China, and have realized that it might not be a good sales tactic to blame the lack of skill, experience and training of pilots in those countries or to imply that only US pilots are skilled enough to handle their finicky planes.

Ironically, I am sure Boeing is now very happy that Airbus' sales have been so robust lately - that has created a big backlog of orders for them.

DenverBrian Apr 5, 2019 6:43 am


Originally Posted by Bear96 (Post 30967555)
They are being proactive - about their future sales.

Looking ahead long-term, they know that most transport aircraft deliveries will be to non-US / "third-world" countries / China, and have realized that it might not be a good sales tactic to blame the lack of skill, experience and training of pilots in those countries or to imply that only US pilots are skilled enough to handle their finicky planes.

Ironically, I am sure Boeing is now very happy that Airbus' sales have been so robust lately - that has created a big backlog of orders for them.

Big companies also have risk assessment, and at this point, you gotta start thinking that Boeing might consider canceling the MAX.

If they don't, then for years to come, you'll have people screaming in panic to get off a swapped last-minute MAX at UA/AA and especially WN.

The decision will likely be made by which major airline cancels their MAX orders first. After all, the NG is still in production; I'm thinking many airlines will just go with NGs.

Bear96 Apr 5, 2019 6:49 am


Originally Posted by DenverBrian (Post 30967563)
Big companies also have risk assessment, and at this point, you gotta start thinking that Boeing might consider canceling the MAX.

If they don't, then for years to come, you'll have people screaming in panic to get off a swapped last-minute MAX at UA/AA and especially WN.

The decision will likely be made by which major airline cancels their MAX orders first. After all, the NG is still in production; I'm thinking many airlines will just go with NGs.

Yes Boeing quite a big mess on its hands. It will be interesting to see how they deal with this over the next few years.

Last I heard (which was a week or so ago now so maybe this has changed) they were still rolling new MAXs off the production line and looking for places to store them because they can't deliver any. They might want to shut the line down for a bit, at least until the new planes can be produced with whatever fixes will finally be made.

It's too bad because they are nice planes (well, for a 737). I actually flew on one (on WN) during the couple of days between the ET crash and the US grounding.


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