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Search: Posts Made By: chrisl137
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Forum: Accidents and Close Calls
5th Feb 2024, 16:51
Replies: 1,950
Views: 935,775
Posted By chrisl137

Subcontractor/vendor whatever. Legally it's all...

Subcontractor/vendor whatever. Legally it's all subcontracts, sometimes with standard terms sometimes with negotiated terms.



It was a random made up example for how incomplete hardware ships....
Forum: Accidents and Close Calls
5th Feb 2024, 14:57
Replies: 1,950
Views: 935,775
Posted By chrisl137

Suppose you have an aircraft factory and you sub...

Suppose you have an aircraft factory and you sub out your fuselages to an outside vendor. Now suppose their delivery for a bunch of units is held up because one of the components, say the full exit...
Forum: Accidents and Close Calls
4th Feb 2024, 16:48
Replies: 1,950
Views: 935,775
Posted By chrisl137

That's probably correct, but in your post that I...

That's probably correct, but in your post that I was responding to you used the word "irretrievably" stuck out the window. I looked up the NTSB report and they unfortunately don't show the cabin...
Forum: Accidents and Close Calls
4th Feb 2024, 00:04
Replies: 1,950
Views: 935,775
Posted By chrisl137

On 1380 the passenger was pulled back into the...

On 1380 the passenger was pulled back into the aircraft by flight attendants with the help of two passengers (https://en.wikipedia.org/wiki/Southwest_Airlines_Flight_1380). There aren't a lot of...
Forum: Accidents and Close Calls
2nd Feb 2024, 02:01
Replies: 1,950
Views: 935,775
Posted By chrisl137

At about 0:42 I see something that looks like a...

At about 0:42 I see something that looks like a stop fitting on the upper part of the left side of the door, but I don't see one on the lower part of the door. So that might be transmitting the load...
Forum: Accidents and Close Calls
1st Feb 2024, 20:45
Replies: 1,950
Views: 935,775
Posted By chrisl137

Probably not. But that wasn’t the point when I...

Probably not. But that wasn’t the point when I brought it up in the first place. Is there an exit door on any modern aircraft where a wedged plug geometry supports the pressure load? They all seem...
Forum: Accidents and Close Calls
1st Feb 2024, 15:01
Replies: 1,950
Views: 935,775
Posted By chrisl137

Sure. There are plenty now that show the door...

Sure. There are plenty now that show the door being ejected and I never said otherwise. But even if that's universal now, it wasn't always. My original specific reference was to back in the old days...
Forum: Accidents and Close Calls
1st Feb 2024, 06:45
Replies: 1,950
Views: 935,775
Posted By chrisl137

I used to see emergency cards that said to put...

I used to see emergency cards that said to put them on the seats. For real. For years.

Much later I also read the reason why: most of the times they get opened in emergencies in emergencies that...
Forum: Accidents and Close Calls
1st Feb 2024, 02:37
Replies: 1,950
Views: 935,775
Posted By chrisl137

Not particularly. There have just been...

Not particularly.

There have just been many posts and comments here (and many other places) about how the plug should be like "other" plug doors that are wedge shaped and can't be blown out...
Forum: Accidents and Close Calls
31st Jan 2024, 14:47
Replies: 1,950
Views: 935,775
Posted By chrisl137

Yes, but the implication of the post I was...

Yes, but the implication of the post I was responding to was that adding stops to the door would make it not blow out. It would just blow out at some other weak point in the bulkhead, since the...
Forum: Accidents and Close Calls
31st Jan 2024, 06:36
Replies: 1,950
Views: 935,775
Posted By chrisl137

I think it's less about the size of the features...

I think it's less about the size of the features that hold the plug in place and more about the structure that holds them in place. As far as I understand it, the bulkhead between the cockpit and...
Forum: Accidents and Close Calls
30th Jan 2024, 23:44
Replies: 1,950
Views: 935,775
Posted By chrisl137

From all the various things I've seen, the story...

From all the various things I've seen, the story of what happened to the bolts seems to be at serious risk of being a case of citogenesis (https://xkcd.com/978/). It would be nice to get an NTSB...
Forum: Accidents and Close Calls
30th Jan 2024, 20:32
Replies: 1,950
Views: 935,775
Posted By chrisl137

Were there ever really "true plugs" in commercial...

Were there ever really "true plugs" in commercial jets? The 737 main door looks like a plug, but the structural part that holds the door against pressure is the same stop and pin arrangement as the...
Forum: Accidents and Close Calls
29th Jan 2024, 18:37
Replies: 1,950
Views: 935,775
Posted By chrisl137

It's not obvious that replacing the plug with a...

It's not obvious that replacing the plug with a door (active or inactivated) is lower risk than the plug.

An openable door assembly mounts in much the same way as the plug - it still uses the...
Forum: Accidents and Close Calls
26th Jan 2024, 03:09
Replies: 1,950
Views: 935,775
Posted By chrisl137

I think the few I've seen are the same ones and...

I think the few I've seen are the same ones and as far as I can tell aren't safety critical, but would mostly be annoying to a mechanic who had to pop the plug out if the had uncoupled the springs...
Forum: Accidents and Close Calls
25th Jan 2024, 18:12
Replies: 1,950
Views: 935,775
Posted By chrisl137

Latches can also fail - example: my car has had a...

Latches can also fail - example: my car has had a couple recalls related to latches. And safety critical latches normally have some additional active mechanism to keep them closed - cars have locks,...
Forum: Accidents and Close Calls
25th Jan 2024, 16:47
Replies: 1,950
Views: 935,775
Posted By chrisl137

Sounds like what happens in any kind of review -...

Sounds like what happens in any kind of review - you get a bunch of action item assignments with varying degrees of specificity and then do whatever the assignment is and provide documentation that...
Forum: Accidents and Close Calls
24th Jan 2024, 06:29
Replies: 1,950
Views: 935,775
Posted By chrisl137

Physical location doesn't necessarily correlate...

Physical location doesn't necessarily correlate with acceptance, and delivery doesn't necessarily lock a record. In other parts of aerospace it's not unusual for something to get delivered to the...
Forum: Accidents and Close Calls
24th Jan 2024, 04:25
Replies: 1,950
Views: 935,775
Posted By chrisl137

Everybody in aerospace has some kind of quality...

Everybody in aerospace has some kind of quality management system, and in general workers from any particular company are going to do work on their own paper, even if it's at a customer facility....
Forum: Accidents and Close Calls
23rd Jan 2024, 05:08
Replies: 1,950
Views: 935,775
Posted By chrisl137

If it does all turn out to be true, it does...

If it does all turn out to be true, it does suggest deeper process problems. If a fastener requires inspection when it's installed, then any procedure that removes and reinstalls that fastener should...
Forum: Accidents and Close Calls
22nd Jan 2024, 06:50
Replies: 1,950
Views: 935,775
Posted By chrisl137

As long as the plug were still in vertical...

As long as the plug were still in vertical alignment, the load would transfer to the stops after deforming the guides and hinge rods (or the bolts), possibly resulting in some deformation of the door...
Forum: Accidents and Close Calls
22nd Jan 2024, 03:32
Replies: 1,950
Views: 935,775
Posted By chrisl137

What the NTSB reported in their last briefing...

What the NTSB reported in their last briefing that's on YouTube was that it was clear that the plug translated up and cleared the stops before blowing out and fracturing the roller guides. The roller...
Forum: Accidents and Close Calls
21st Jan 2024, 04:17
Replies: 1,950
Views: 935,775
Posted By chrisl137

They may have it a little easier than that....

They may have it a little easier than that. They've verified that the starboard side plug was correctly installed with all the fasteners. It's the same age and has been through as close to an...
Forum: Accidents and Close Calls
21st Jan 2024, 03:38
Replies: 1,950
Views: 935,775
Posted By chrisl137

The only argument I see against that is if the...

The only argument I see against that is if the springs are strong enough to lift the plug over the stop fittings. If that's true, it should have launched on its first flight.

My working...
Forum: Accidents and Close Calls
20th Jan 2024, 21:18
Replies: 1,950
Views: 935,775
Posted By chrisl137

I'd be surprised if they're doing structural...

I'd be surprised if they're doing structural testing on the plug itself, since there's no evidence of structural failure. If they want to know if the bolts failed, they'd have to pull a bunch of...
Forum: Accidents and Close Calls
20th Jan 2024, 20:46
Replies: 1,950
Views: 935,775
Posted By chrisl137

I looked at the article and the "or testing to...

I looked at the article and the "or testing to the exact point of failure" was not a quote from Homendy, but looks like a clarification written by the author. I haven't found a transcript or video...
Showing results 1 to 26 of 26


 
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