Fogbow

RTH10260 wrote: ↑Tue Jan 09, 2024 2:31 am Loose bolts? That may be a serious quality control problem at Boeing. The video by GG above shows that all bolts ought to be secured by a pin against accidential loosening.

neeneko wrote: ↑Tue Jan 09, 2024 6:05 am
I wonder if there is a certain element of zipf's law here. On the line I am familiar with, their big thing is making sure there is no debris in the aircraft. Signs all over the place about checking for parts or tools or garbage, but not a single sign highlighting that you have to tighten every single bolt.

Guide roller fittings on Alaska Max 9 door plug are fractured: NTSB

By Pilar Wolfsteller
9 January 2024

The US National Transportation Safety Board (NTSB) said that damage to a door plug which blew out of an in-flight Alaska Airlines Boeing 737 Max 9 last week includes fractured guide fittings that hold the plug in place.

In her third media briefing in as many days, NTSB chair Jennifer Homendy said on 8 January that while information is still being gathered on the cause of the blow-out, experts have been able to identify which parts of the aircraft’s door plug failed, after the piece was found in a yard in Portland, Oregon and recovered.

“We cannot tell you at this time how and why,” she says. “We will have that information, it’s going to take time, we are going to have to analyse the components.”

According to NTSB aerospace engineer Clint Crookshank, there are 12 stop pads on the door frame in the fuselage, and 12 stop pins on the door plug. For the door to be secured in place, they must meet and push against each other.

“To install that plug in the fuselage, you rotate it up so that the plug stop is above the door stop, it translates inboard and down so that the stops engage,” he says. “Four stop bolts are installed in the mechanism. There is a guide roller on each side, on the upper side of the door frame, that engages with a guide fitting on the plug.”

“The examination shows that all 12 stops became disengaged allowing [the door plug] to blow out of the fuselage. Both guide roller tracks were fractured,” Crookshank adds.

“The door translated up, disengaged from the stops, and fractured the fittings.”

“We have not yet recovered the four bolts that restrain it from its vertical movement, and we have not determined if they existed there,” Crookshank adds.

Why all that happened shortly after the aircraft took off is still a mystery, though, the investigators say.



https://www.flightglobal.com/safety/gui ... 07.article

Stone Cold Jane Austen
@AbbyHiggs

“When one door closes, another opens.”

— Boeing

RTH10260 wrote: ↑Tue Jan 09, 2024 2:31 am Loose bolts? That may be a serious quality control problem at Boeing. The video by GG above shows that all bolts ought to be secured by a pin against accidential loosening.

neeneko wrote: ↑Tue Jan 09, 2024 6:05 am

I wonder if there is a certain element of zipf's law here. On the line I am familiar with, their big thing is making sure there is no debris in the aircraft. Signs all over the place about checking for parts or tools or garbage, but not a single sign highlighting that you have to tighten every single bolt.

Frater I*I wrote: ↑Tue Jan 09, 2024 5:35 pm Not a sign per say, but such instructions would be in the tech data for the installation of the plug, something that the person installing it would have to have while doing the task per FAA regulations...

Boeing CEO acknowledges ‘mistake’ related to terrifying Alaska Airlines flight

Boeing CEO David Calhoun acknowledged the company’s “mistake” in the wake of the Alaska Airlines incident at a staff-wide “safety meeting” Tuesday.

“We’re going to approach this number one acknowledging our mistake,” Calhoun told staff, according to a partial readout of the meeting shared with CNN. “We’re going to approach it with 100% and complete transparency every step of the way. We are going to work with the NTSB who is investigating the accident itself to find out what the cause is.”

A company source told CNN that the company believes “the mistake in question” was introduced in the aircraft’s manufacturing supply chain, however it is not yet known if Calhoun identified any specific error during the presentation.

The source said the meeting also included a reminder of the seriousness of the situation. Employees were told that the company’s Chief Safety Officer is now in charge of the 737 Max fleet, the source said. Mike Delaney is Boeing’s Chief Aerospace Safety Officer.

neeneko wrote: ↑Tue Jan 09, 2024 5:47 pm

Frater I*I wrote: ↑Tue Jan 09, 2024 5:35 pm Not a sign per say, but such instructions would be in the tech data for the installation of the plug, something that the person installing it would have to have while doing the task per FAA regulations...

Sometimes people need large brighty coloured signs to remind them to do the thing they are already supposed to be doing.

neonzx wrote: ↑Tue Jan 09, 2024 6:28 pm And will they now release the 737 Max PRO edition?

I really hate that I have to check what equipment I am flying on when I book a flight.

Dr. Ben Braddock @GraduatedBen wrote: For the 777, Boeing put their heads of software engineering on the test flights.

For the 737 Max, Boeing outsourced the software testing to $9 an hour contractors in India.

Decline is a choice.

raison de arizona wrote: ↑Wed Jan 10, 2024 11:42 am
For the 777, Boeing put their heads of software engineering on the test flights.

For the 737 Max, Boeing outsourced the software testing to $9 an hour contractors in India.

Decline is a choice.

RTH10260 wrote: ↑Wed Jan 10, 2024 7:17 pm Software cannot compensate when hardware redundancy does not exist in the first place.

RTH10260 wrote: ↑Wed Jan 10, 2024 4:19 am NTSB at their press conference: they are not even sure that the missing bolts were even there

https://youtu.be/L92zwvkr1pQ

much ado wrote: ↑Wed Jan 10, 2024 7:58 pm

That was my guess, based on the lack of damage to the cams in the upper part, as shown in the video. Bolts don't really have to be tight, they just have to be present. As long as they are there, they prevent the plug from opening. But the video did not show the condition of the lower part of the opening where the other two bolt were...

So who did it? #1Was it during assembly at Boeing? #2 Or was it by maintenance checking for leaks? My guess is Boeing, which would probably mean at least two complete fuck-ups, #3first, the person who was supposed to put the bolts in place, and #4second, the person who was responsible for checking that the assembly was done correctly.

I'm sure frater knows better than I do.

Frater I*I wrote: ↑Wed Jan 10, 2024 8:36 pm #2:: the aircraft was never put into maintenance after the pressurization issues had be reported by the previous day's flight crew. It should have been.

And as I posted before the airline will be looking at fines for not adressing the issue when reported by the aforementioned flight crew...

United Airlines flight to Chicago makes emergency landing in Tampa after door indicator light turns on

Suranis wrote: ↑Thu Jan 11, 2024 1:48 pm

United Airlines flight to Chicago makes emergency landing in Tampa after door indicator light turns on

https://wgntv.com/news/national/united- ... ns-on/amp/

I cant read it as its region restricted. but apparently it was an Airbus, not a Boeing plane but the article barely mentions that.