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Search: Posts Made By: incompleteness
Showing results 1 to 35 of 38
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Forum: Accidents and Close Calls
10th Feb 2024, 03:08
Replies: 1,950
Views: 935,649
Posted By incompleteness

That is absoultely what I thought too until I...

That is absoultely what I thought too until I zoomed in on the upper line and saw it seems to extend onto the painted surface of the fastener hole, so it looks like its been drawn on. It could be...
Forum: Accidents and Close Calls
10th Feb 2024, 01:48
Replies: 1,950
Views: 935,649
Posted By incompleteness

Something I noticed in the picture in post 1632...

Something I noticed in the picture in post 1632 (https://www.pprune.org/accidents-close-calls/656760-alaska-airlines-737-900-max-loses-door-flight-out-pdx-41.html#post11591676) is that the failure...
Forum: Accidents and Close Calls
7th Feb 2024, 19:36
Replies: 1,950
Views: 935,649
Posted By incompleteness

It's funny how we read the same thing and drew...

It's funny how we read the same thing and drew opposite conclusions. I find the language passive as if they were saying the bolts would have had to be removed. Figure 14 is too low res for me to see...
Forum: Accidents and Close Calls
6th Feb 2024, 20:39
Replies: 1,950
Views: 935,649
Posted By incompleteness

Im not sure the Times read the report correctly....

Im not sure the Times read the report correctly. I don't think the report specifically says they removed 4 bolts, it just says they opened the plug. If the bolts weren't there to begin with they...
Forum: Accidents and Close Calls
4th Feb 2024, 12:42
Replies: 1,950
Views: 935,649
Posted By incompleteness

This is a really great question. The FAA is...

This is a really great question. The FAA is calling this an accident, not any incident. "Accident" is anything that involves death, serious injury, or substantial damage to the aircraft, "incident"...
Forum: Accidents and Close Calls
2nd Feb 2024, 15:30
Replies: 1,950
Views: 935,649
Posted By incompleteness

The picture reminds me of a missionization I...

The picture reminds me of a missionization I worked on once. The shop kept miss-drilling holes so we figured their drilling procedure was: two guys with headsets, one on the outside with a drill, one...
Forum: Accidents and Close Calls
1st Feb 2024, 00:47
Replies: 1,950
Views: 935,649
Posted By incompleteness

In the time it takes for air to evacuate from a...

In the time it takes for air to evacuate from a breached compartment, there is leakage from adjacent compatments into the beached one. The leakage is through natural and purpose-designed passages and...
Forum: Accidents and Close Calls
31st Jan 2024, 18:53
Replies: 1,950
Views: 935,649
Posted By incompleteness

FAR 25.365...

FAR 25.365 (https://www.ecfr.gov/current/title-14/chapter-I/subchapter-C/part-25#25.365) is the reg. The formula in there works out to about 4 square feet for the 737, which is less than the door...
Forum: Accidents and Close Calls
31st Jan 2024, 17:50
Replies: 1,950
Views: 935,649
Posted By incompleteness

Emphasis mine. I'm not convinced there were any...

Emphasis mine. I'm not convinced there were any engineering failures leading to the plug departure. On the resulting decompression, there is a lot we don't know.

Re the decompression, things to...
Forum: Accidents and Close Calls
29th Jan 2024, 15:01
Replies: 1,950
Views: 935,649
Posted By incompleteness

The RNC process (report of non-conformance, maybe...

The RNC process (report of non-conformance, maybe called something else at Boeing) is really human-dependent. Quality writes up the issue and it can be as little as "chipped paint around rivet...
Forum: Accidents and Close Calls
29th Jan 2024, 13:34
Replies: 1,950
Views: 935,649
Posted By incompleteness

Red emphasis mine. It think the attempt by Spirit...

Red emphasis mine. It think the attempt by Spirit to get away with a cosmetic 'repair' cuts right to the heart of the cultural conundrum that Boeing faces. I think we all realize this is about more...
Forum: Accidents and Close Calls
28th Jan 2024, 05:35
Replies: 1,950
Views: 935,649
Posted By incompleteness

Different versions of that have been around for...

Different versions of that have been around for years, the one I posted is just what I happened to find first.
Forum: Accidents and Close Calls
26th Jan 2024, 18:56
Replies: 1,950
Views: 935,649
Posted By incompleteness

By far the most common types of rivets in civil...

By far the most common types of rivets in civil aluminium skin installation are MS20426AD (flush) and good old MS20470AD (protruding). AD means the material is 2117-T4 which is driven as-is (not...
Forum: Accidents and Close Calls
24th Jan 2024, 18:26
Replies: 1,950
Views: 935,649
Posted By incompleteness

Do they get budget and schedule time for these...

Do they get budget and schedule time for these quality reforms? Based on experience, I wonder.

Airbus has an anonymous tip line and specific training that nobody can be pushished for speaking up.
Forum: Accidents and Close Calls
23rd Jan 2024, 15:15
Replies: 1,950
Views: 935,649
Posted By incompleteness

It is depressed WRT the skin because it moves...

It is depressed WRT the skin because it moves outwards to nominally flush when pressurized. The light is from the front causing a shadow on the front edge but not the back, giving the illusion of...
Forum: Accidents and Close Calls
22nd Jan 2024, 22:18
Replies: 1,950
Views: 935,649
Posted By incompleteness

I don't think there's a latch fitting on the...

I don't think there's a latch fitting on the frame. That would have to be installed which might be a big deal if the backup intercostals also need to be installed. That would be a large-ish...
Forum: Accidents and Close Calls
21st Jan 2024, 23:55
Replies: 1,950
Views: 935,649
Posted By incompleteness

There is one terrible possibility that I'm not...

There is one terrible possibility that I'm not sure how they are going to address, and that is: what if the bolts were installed but they were bogus parts? Made from some very low strength, low...
Forum: Accidents and Close Calls
21st Jan 2024, 03:55
Replies: 1,950
Views: 935,649
Posted By incompleteness

If my memory isn't failing me, Homendy said...

If my memory isn't failing me, Homendy said earlier that lab examination of the plug components would reveal whether or not the bolts were installed. I think that was a little optimistic. As far as i...
Forum: Accidents and Close Calls
17th Jan 2024, 23:35
Replies: 1,950
Views: 935,649
Posted By incompleteness

To point 2: those bolts are loosened/tightened...

To point 2: those bolts are loosened/tightened for rigging of the door. The fitting and the frame pad it is bolted to have matching serrated surfaces as seen in a picture I pulled from post 569:
...
Forum: Accidents and Close Calls
17th Jan 2024, 15:29
Replies: 1,950
Views: 935,649
Posted By incompleteness

Are you sure that's a seal retainer? I have to...

Are you sure that's a seal retainer? I have to admit I've stared at that thing that goes up over the door cutout for a few hours and my best guess is it provides attachment points for interior panels...
Forum: Accidents and Close Calls
15th Jan 2024, 22:32
Replies: 1,950
Views: 935,649
Posted By incompleteness

I think I could make out on one of the NTSB field...

I think I could make out on one of the NTSB field photos one of the aft post guide fitting bolts with the head pulled off. So I feel like the nutplates were actually strong enough in tension.

The...
Forum: Accidents and Close Calls
15th Jan 2024, 11:44
Replies: 1,950
Views: 935,649
Posted By incompleteness

One thing the NTSB lab photo shows, I think, is...

One thing the NTSB lab photo shows, I think, is that the lower hinge post guide fittings are attached to the door with one-lug nutplates. You can see them beside the NTSB lady's arm.

Something...
Forum: Accidents and Close Calls
14th Jan 2024, 23:30
Replies: 1,950
Views: 935,649
Posted By incompleteness

That image is weird. The v-stab is perforated and...

That image is weird. The v-stab is perforated and its got odd blobbiness all over like you see in AI images.
Forum: Accidents and Close Calls
14th Jan 2024, 03:31
Replies: 1,950
Views: 935,649
Posted By incompleteness

Some people must have looked at the two empty...

Some people must have looked at the two empty seats beside the big gaping hole and asked themselves "I can't remember, were there people in those seats before?"

People do absolutely random things...
Forum: Accidents and Close Calls
13th Jan 2024, 18:34
Replies: 1,950
Views: 935,649
Posted By incompleteness

I'm not sure what diameter the arrestor bolts are...

I'm not sure what diameter the arrestor bolts are because my eyeballing skills aren't up to it, but they must at least be 6/32. Your basic vanilla 6/32 bolt has a shear strength around 2000 lbs. The...
Forum: Accidents and Close Calls
13th Jan 2024, 09:51
Replies: 1,950
Views: 935,649
Posted By incompleteness

That kind of c-shaped hinge is usually called a...

That kind of c-shaped hinge is usually called a "gooseneck". Looking at the video it seems to me the operable door has dampers that control the opening. Ie, it doesn't just fall open and hit the...
Forum: Accidents and Close Calls
12th Jan 2024, 17:32
Replies: 1,950
Views: 935,649
Posted By incompleteness

Yes this is about the biggest step the FAA could...

Yes this is about the biggest step the FAA could take short of pulling selected Boeing delegations of authority, which it also looks like they are threatening to do.

There are probably some ex...
Forum: Accidents and Close Calls
11th Jan 2024, 23:55
Replies: 1,950
Views: 935,649
Posted By incompleteness

In this latest video, Chris talks about the lack...

In this latest video, Chris talks about the lack of documentation for cockpit door opening under rapid decompression. The AMM says the door "is able to withstand the pressure difference due to the...
Forum: Accidents and Close Calls
11th Jan 2024, 02:38
Replies: 1,950
Views: 935,649
Posted By incompleteness

Why does the door plug look overdesigned, with...

Why does the door plug look overdesigned, with heavy machinged members? The main reason is because it works as a curved plate to carry the pressure, which means there is a lot of plate bending in the...
Forum: Accidents and Close Calls
10th Jan 2024, 20:34
Replies: 1,950
Views: 935,649
Posted By incompleteness

I don't think those are bushings, those are the...

I don't think those are bushings, those are the bolts, and it's interesting. First of all, it looks like the failure mode was tension in these two, not shear. I say it because one looks like it has...
Forum: Accidents and Close Calls
10th Jan 2024, 09:25
Replies: 1,950
Views: 935,649
Posted By incompleteness

I think I can help with your question. There is...

I think I can help with your question. There is often a tug of war between the design office and the stress office with regard to hole tolerances. Design wants sloppy holes for ease of assembly and...
Forum: Accidents and Close Calls
9th Jan 2024, 05:07
Replies: 1,950
Views: 935,649
Posted By incompleteness

[/list] If any of the bolts were installed and...

[/list]
If any of the bolts were installed and were pushed out of the way by some mysterious and huge force, they would have elongagted the holes, no question. If they are looking at holes that seem...
Forum: Accidents and Close Calls
8th Jan 2024, 20:30
Replies: 1,950
Views: 935,649
Posted By incompleteness

What it does tell us is that the door is intact...

What it does tell us is that the door is intact and didn't collapse. So, the failure was *not* collapse of the door which is a huge relief. Unless the other side shows the stop fittings failed, which...
Forum: Accidents and Close Calls
8th Jan 2024, 19:26
Replies: 1,950
Views: 935,649
Posted By incompleteness

Thoughts on the decompression: There is a...

Thoughts on the decompression:

There is a rule in the FARs, 25.365, that lays out what decompression conditions that pressurized compartments have to be able to withstand.

There's a handy...
Forum: Accidents and Close Calls
8th Jan 2024, 03:27
Replies: 1,950
Views: 935,649
Posted By incompleteness

Before it was laid out in the latest Chris Brady...

Before it was laid out in the latest Chris Brady video I was convinced there was a "locking insert' in the roller guide fitting that was held by the pin, with the insert countoured to the radius of...
Showing results 1 to 35 of 38
 
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