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Boeing 737 Max8 Aircraft Crashes and Investigations [Part 8] 24

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Sparweb

Aerospace
May 21, 2003
5,131
This post is the continuation from this series of previous threads:

thread815-445840
thread815-450258
thread815-452000
thread815-454283
thread815-457125
thread815-461989
thread815-466401

This topic is broken into multiple threads due to the length to be scrolled, and images to load, creating long load times for some users and devices.
If you are NEW to this discussion, please read the above threads prior to posting, to avoid rehashing old discussions.

Thank you everyone for your interest! I have learned a lot from the discussion, too.

Some key references:
Ethiopian CAA preliminary report (Link from Ethiopia is now broken. See link from NTSB Investigations below)

Indonesian National Transportation Safety Committee preliminary report

NTSB Investigations

NTSB Safety Recommendation Report: Assumptions Used in the Safety Assessment Process and the
Effects of Multiple Alerts and Indications on Pilot Performance


A Boeing 737 Technical Site

Washington Post: When Will Boeing 737 Max Fly Again and More Questions

BBC: Boeing to temporarily halt 737 Max production in January

Pulitzer Prize, For groundbreaking stories that exposed design flaws in the Boeing 737 MAX that led to two deadly crashes and revealed failures in government oversight.


 
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These airframes are the ones that were produced and then were sitting in the parking lot after they stopped delivering them.
 
Well now there seems to a problem with rivet heads on the 777 they want to change the airworthiness directive.
This proposed AD would require doing a detailed inspection of the left and right side sloping pressure deck at certain stations for any damaged solid rivets, and applicable on-condition actions.

“…loss of sloping pressure deck panels, causing decompression and pressure loss, and loss of the hydraulic systems in the area for wheel brakes (both normal and alternate) and steering, and potentially leading to runway departure and adversely affecting the structural integrity of the airplane.

and also some concerned about the fuel quantity processor units (FQPUs) on the 737 MAX.


Best Regards A

“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
 
This thing with the manufacturing issue that could affect the operation of a backup power control unit.
Seems to be the unit that controls the generators and external power use.

Not shore if this is the right one.

BPCU_e9cexf.jpg


BR A

“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
 
Looks like the old foundation wall review syndrome... new construction and someone finds a crack in an existing foundation wall... in looking, the owner finds lots of new cracks... I've done investigations where the 'new' cracks have old debris and cobwebs in them... but, once you start looking... I have no idea of how long this will continue.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik
 
Yes I am not shore sure how old this 777:s are, but the airworthiness directive is like a maintenance plan, so that it get reviewed and changed when things turn up, is as it should be.
It is good that it is done.

This thing with the fuel quantity processor units at the 737 MAX, not shore sure what that is.

/A

“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
 
The aircraft measures how much fuel it's burning and keeps a running total and then cross checks it against what it see's in the tanks. If the tanks are going down faster than it thinks you are using it then it triggers a fuel leak caution.
 
Off Topic, for RedSnake: I know English isn't your first language, so I intend this to be helpful. As Far As I Know there's no private message system, otherwise I wouldn't post spelling corrections publicly. "Shore" is a synonym for "coast", it's the bit where a body of water meets land. "Sure" is the word you want, meaning a feeling of certainty. They sound quite similar in most dialects. "Shore" would be /ʃɔɹ/, "sure" would be /ʃʊɹ/ (General American accent, Received Pronunciation and other accents will differ) in the International Phonetic Alphabet.
 
Thanks Eufalconimorph for pointing it out :)
No problem, I did have high grades in speaking and understanding English, but not in spelling and grammars, it's the same with Swedish. [lol]
Maybe at least I can offer someone a good laugh from time to time. ;-)
I can't promise that I will remember it for ever, but I will try.
My dear departed CH he would really have scolded me for something like that, he was a real language genius, I am more for numbers.

Best Regards A

“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
 
Your English is a hell of a bunch better than my Swedish... You're doing great and your comments are appreciated. Don't worry about it, unless you want to learn English a bit better. I remember the English that a lot of the computer hardware manuals had when they first came out 30 years back...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik
 
No, built by JPL. Software update likely because the people who built and designed it kept thinking about the code after launch, and had some bright ideas or found some potential flaws that they wanted to correct. Pretty typical of a one-off unit, and for NASA. The various probes, from Mariner onwards, have had numerous updates for a variety of reasons. When the bearings wore out on the Voyager probe, the thrusters were used to pan the s/c camera for passages at Uranus, and that required testing and reprogramming of the software to accomplish. So it's really a cool thing, not a flaw or anything to be dissappointed about.
 
RedSnake,
The Swedish starts at 1:20
Link

Brad Waybright

The more you know, the more you know you don't know.
 
I read that they were getting some issues on the high rotor speed tests. So the software update might be to sort that out.

I love following the JPL work.
 
OK - I figure this thread has run its course.
We haven't quite satisfied Godwin's law yet, but in the past month this thread has more about the king of Sweden and rugby players than it does about one particular model of aircraft. Let's shut it down before anything goes wrong.

Thank you to everyone who participated! This subject earned a healthy 8 chapters, as the long saga unwound. Not to everyone's satisfaction, clearly. I learned a lot, and hope you all did, too.



Please remember: we're not all rednecks!
 
I agree. I certainly learnt a whole heap about airplanes I never knew before but the plane's back flying and hasn't fallen out of the sky due to the same issue (yet), The FAA had spoken and any further issues can have their own post.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
To be honest we would be better with a general Boeing engineering failure thread pretty much every fleet from the last 20 years has issues now. And production issues.
 
I remember, (was it about a year ago now?) when the MAX was being presented as "The Safest Plane" due to the scrutiny of the regulators and Boeing.
Now we find that Boeing is guilty of another unauthorized and unreported short cut, and the FAA didn't catch it until now.
So much for the "Safest plane" due to the "Intense scrutiny".
Quite some time ago, when it looked like Boeing was on track to get the Max back in the air, I was thinking;
"With all these issues so far, have all the problems been found? Will there be another undisclosed issue? What and when will be next."
Is this Boeing bashing or fair comment?
"If it's Boeing. I'm not going."
Boeing bashing or prudent self preservation based on Boeing's history of rule breaking and Boeing's disregard for the safety of the flying public.?
What will be the next safety issue caused by some cost cutting measure, or rule avoidance?
Wait for it!
(And if I had said that a year ago I would have expected to be pooh-poohed.
Now?
Fair comment based on Boeing's history and corporate culture.)

Bill
--------------------
Ohm's law
Not just a good idea;
It's the LAW!
 
THE END​
---------------​

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
_________________________________AND THEN THEY LIVED HAPPILY EVER AFTER_____________________________or............

“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
 
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