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

theaircurrent.com

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

#31

This is reassuring news to me, as someone who has opted for Airbus over Boeing (and even paid extra for it) whenever given the choice since the first 737-MAX crashes in 2017.

How is this reassuring?! Are you sure you don't mean "vindicating" or similar? Hard to understand how anyone could feel reassured by this.

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

#32

At what point do consumers en-masse refuse to fly on these aircraft, if ever? When there's a few more fatal crashes?

Maybe when airlines start advertising that they don’t use the new 737s.

The more likely scenario is that the Chinese or Europeans will ground the new 737s until some very expensive fix is put into place and not accept any workarounds. That would probably make a difference.

FYI: https://qz.com/1569865/china-grounds-737-max-8-after-ethiopi...

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

#34
post #20

On at least 5 airplanes? Of one airline? Are loose bolts a minor issue, or is it as insane as it reads?

No, it's as insane as it reads. It means people were careless and sloppy during assembly. Think of it like seeing "one cockroach in your kitchen." It's not one cockroach. You just haven't opened up the rest of the walls.

Or it means the torque specs were a little too low, or too high and stripped, or the bolt threading was defective/spec’d wrong. Or bad metallurgy. Or the spec didn’t specify which order to tighten the bolts, so which direction you go causes different outcomes.

Lots of stuff is assembled consistently and carefully “wrong”, but as specified.

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

#35

Earlier quoted context omitted.

My money is on the window. It was compromised and then the plug/bolts/flanges structure was ripped out of the body.

How would compromise of the window encourage the plug to be ripped out?

My assumption is the decompression event would have put the velocity of that decompression on the door/bolts and they are going to be weaker - and the addition of a window into a plug/door like this adds structural mass to add to that which is being sucked out via the decompression putting them over spec load for that area - but since it was a plug, the surrounding structure was still sound - just that thing couldnt handle the load.

EDIT: Maybe the bolts have a really high shearing tolerance, but not as good of a tensile pull?

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

#36
post #20

On at least 5 airplanes? Of one airline? Are loose bolts a minor issue, or is it as insane as it reads?

No, it's as insane as it reads. It means people were careless and sloppy during assembly. Think of it like seeing "one cockroach in your kitchen." It's not one cockroach. You just haven't opened up the rest of the walls.

Assembly was loppy, management either ignored or, even worse, encouraged it while QA was asleep. Which is really bad...

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

#37
post #33

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

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

#38

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

I know of a pretty famous car tuner in the US (I won't get too specific for various reasons) and despite most people in my community going to him for service over the years, multiple people have come out and proved he rarely if ever torques anything to spec. For the longest time he even allowed customers to watch in the shop space as he worked on their cars and he'd hand-torque many things that the car manual was very clear needed to be specifically torqued for safety and operational reasons.

The fact that people would share this and it didn't curb the amount of business and referrals he got just proved to me what you've said for the longest time.

People don't like to be troubled with details and they'd rather be ignorant of them.

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

#39

This is reassuring news to me, as someone who has opted for Airbus over Boeing (and even paid extra for it) whenever given the choice since the first 737-MAX crashes in 2017.

How is this reassuring?! Are you sure you don't mean "vindicating" or similar? Hard to understand how anyone could feel reassured by this.

It's "reassuring" in the sense that I'm reassured I've been making the right decision... but yeah, "vindicating" is probably a more appropriate choice of word :)

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

#40
post #20

On at least 5 airplanes? Of one airline? Are loose bolts a minor issue, or is it as insane as it reads?

No, it's as insane as it reads. It means people were careless and sloppy during assembly. Think of it like seeing "one cockroach in your kitchen." It's not one cockroach. You just haven't opened up the rest of the walls.

> It means people were careless and sloppy during assembly.

Maybe. Could also be incorrect torque specs, bad parts, unexpected vibration in that area, etc.

Edit: Yes, none of these are good either. Just saying there are many possibilities.

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