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United finds loose bolts on plug doors during 737 Max 9 inspections

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Re: United finds loose bolts on plug doors during 737 Max 9 inspections

#111
post #81

Earlier quoted context omitted.

I doubt ever, consumers have been proven to select the cheapest airline ticket. The average once-a-year flier likely has no idea what aircraft they are even flying on.

I wonder what fraction of seats/revenue come from people who take one or fewer trips per year.

1% of people represent 50% of the ~~flights~~ emissions (see thread): https://www.theguardian.com/business/2020/nov/17/people-caus...

Re: United finds loose bolts on plug doors during 737 Max 9 inspections

#112

Earlier quoted context omitted.

You're catastrophizing a bit. This isn't an America problem it's a Boeing problem. American air travel is safer than it's ever been. Going years without a single fatality is now the norm, not an exception. The airlines are well run and do care deeply about safety. The regulators aren't perfect but generally do a good job. The NTSB is world-class. Boeing will continue to lose marketshare to Airbus and feel some pain w…

Working conditions in the USA have come to a point where many don't care because the company doesn't care about them. People are fired at will after working for 20+ years with zero shits given. There is zero loyalty and in return workers just don't care either. There are only so many checks and balances you can build in until this situation will catch up with you. Doesn't amazon have such a huge turn over that they a…

Thanks, Jack Welch. May you burn in hell for making the 21st century worker-employer relationship so adversarial.

Re: United finds loose bolts on plug doors during 737 Max 9 inspections

#113

Earlier quoted context omitted.

My beef is that torque specs are for factory assembly. If you’re using new parts, sure, but once they’re old/re-used parts with some corrosion due to dissimilar metals, age or salt belt, you’re flying blind and probably undertorquing if going by the book. Given the amount of (soft) aluminum on aircraft, (737 is 80% aluminum), it would be insane to not precisely consider torque. Steel on steel is more forgiving.

Why would the softness matter for torque, if there has been some shift or compression since original install the torque should still ensure the correct pressure between the fitting, no?

Soft materials develop wear more easily.

e.g. any slight boogering of the threads of a used fastener could translate into rotational torque that doesn't end up being converted to a clamping force.

(or in more extreme instances, some fasteners are torque to yield, and change shape after their first use, and must be replaced. But I'll presume that's not what they were talking about here)

Re: United finds loose bolts on plug doors during 737 Max 9 inspections

#114

It seems there's a sense of malaise falling over everything and everyone in the USA. People at large simply cannot be bothered to care about anything, including torque specs for freakin' AIRLINERS

The 'malaise' is the rot coming from uncurbed late-stage capitalism. Just about every single company only cares about short-term forecasts which leads to enshittification because there is no long-term planning or allowance for things like quality control.

Privately-owned companies or worker-owned companies are more resilient to this problem because the nature of their existence means a stronger focus on long term goals. Though there are still issues with publicly owned companies exerting enough influence to acquire and subsequently destroy private companies. For example, Rite-Aid acquiring Bartell Drugs then going bankrupt and proceeding to shutter most Bartell Drug stores leaving Seattle with a deficit of pharmacies.

Re: United finds loose bolts on plug doors during 737 Max 9 inspections

#116

Earlier quoted context omitted.

>People at large simply cannot be bothered to care about anything People care deeply about a lot of things, just not this. And why should they? When you have every business decision made either by private equity or public companies with a focus only on the next 90 days it turns out everything goes to shit. Wages are stagnant. Wealth inequality is massive. Our society is sick. Issues like this will only increase. Our…

Random aside: I looked up an Acela ticket this morning. $1000 for a first class ticket from DC to BOS. 6.5 hours. Same flight first class with Delta this week is $850. Also 6 hours with layover. Blows my mind first class rail travel is as much as first class air travel.

Do you mean that the train is _as cheap_ as taking a plane?

In my experience, in the UK, taking a train is more expensive than taking a flight (or driving, for that matter).

Re: United finds loose bolts on plug doors during 737 Max 9 inspections

#117

There were only 2 possible causes of the incident, either the bolts had been replaced with bolts made from an inappropriate material, so they broke, or the bolts had not been assembled correctly, and they became loose. It appears that the latter is what happened. Perhaps those who did the assembly of the doors at Boeing did not use the right kind of washers that are needed to prevent the unscrewing of the bolts, or t…

The torque or fastener spec could just be wrong in the face of unforeseen resonance or some other in-flight oddity cumulatively loosening the bolts.

I wouldn't be so certain it's installation error or mfr defect of the fasteners...

Re: United finds loose bolts on plug doors during 737 Max 9 inspections

#118

Earlier quoted context omitted.

You're catastrophizing a bit. This isn't an America problem it's a Boeing problem. American air travel is safer than it's ever been. Going years without a single fatality is now the norm, not an exception. The airlines are well run and do care deeply about safety. The regulators aren't perfect but generally do a good job. The NTSB is world-class. Boeing will continue to lose marketshare to Airbus and feel some pain w…

Working conditions in the USA have come to a point where many don't care because the company doesn't care about them. People are fired at will after working for 20+ years with zero shits given. There is zero loyalty and in return workers just don't care either. There are only so many checks and balances you can build in until this situation will catch up with you. Doesn't amazon have such a huge turn over that they a…

Sorry, but habe you ever worked in an aero assembly plant? You're making it sound like it's just like any other warehouse sweatshops job where you need to pee in a bottle while you work to meet your quotas when it's the furthest thing possible from that.

You definitely have enough time to work at leisurely pace and assemble every part right. There's not much rushing going on there. If workers get away with doing dodgy work you have a QA issue.

Re: United finds loose bolts on plug doors during 737 Max 9 inspections

#119

Doesn’t this call into question the manufacturing of ALL 737 MAX’s including the 7 and 8 since they must use the same manufacturing process?

Yeah this isn't a plane issue, it's a guy holding the drill issue as far as I understand it

Re: United finds loose bolts on plug doors during 737 Max 9 inspections

#120

Earlier quoted context omitted.

My beef is that torque specs are for factory assembly. If you’re using new parts, sure, but once they’re old/re-used parts with some corrosion due to dissimilar metals, age or salt belt, you’re flying blind and probably undertorquing if going by the book. Given the amount of (soft) aluminum on aircraft, (737 is 80% aluminum), it would be insane to not precisely consider torque. Steel on steel is more forgiving.

> If you’re using new parts, sure, but once they’re old/re-used parts Most service manuals require new bolts, fasteners and washers for torque-critical parts.

Skipping that part is even more ubiquitous than failure to properly torque. It takes a lot of effort to buy the correct bolts, only specialists have them to hand for a given make. Even dealers might not have every bolt. So it means you need to procure many more parts you would otherwise (the part you're replacing, plus 20 specific bolts with part numbers).. Most mechanics don't bother unless it's something really big like cylinder head bolts or an axle nut.
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