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Search: Posts Made By: MechEngr
Showing results 1 to 35 of 89
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Forum: Accidents and Close Calls
18th Mar 2024, 16:08
Replies: 1,950
Views: 935,845
Posted By MechEngr

Since that photo was taken by Spirit and the...

Since that photo was taken by Spirit and the installed door is part of the Spirit supply of the fuselage and Spirit replaced the door seal, I'd say that the door was opened by Spirit as part of the...
Forum: Accidents and Close Calls
18th Mar 2024, 15:42
Replies: 1,950
Views: 935,845
Posted By MechEngr

What an odd observation to make. Not Mr. Tran in...

What an odd observation to make. Not Mr. Tran in his entirety, just his leg. I think I would be looking at the big picture about a suddenly unimpeded view of the universe twirling about Mr. Tran had...
Forum: Accidents and Close Calls
13th Mar 2024, 05:49
Replies: 1,950
Views: 935,845
Posted By MechEngr

"When asked about the report, Alaska Airlines...

"When asked about the report, Alaska Airlines said it could not find any record of a report of whistling coming from the plane."

Lots of documentation going missing.

The plot thickens.
Forum: Accidents and Close Calls
9th Mar 2024, 21:14
Replies: 1,950
Views: 935,845
Posted By MechEngr

There are photos of the door with the bolts in...

There are photos of the door with the bolts in place and the flags placed to indicate the rivets that needed to be reworked.

Unless you are being snarky - which I admit would also be justified....
Forum: Accidents and Close Calls
7th Mar 2024, 23:48
Replies: 1,950
Views: 935,845
Posted By MechEngr

"As previously reported by The Seattle Times,...

"As previously reported by The Seattle Times, Boeing employees opened the door plug to allow mechanics from supplier Spirit AeroSystems to fix some poorly installed rivets in the adjacent door frame....
Forum: Accidents and Close Calls
6th Mar 2024, 23:48
Replies: 1,950
Views: 935,845
Posted By MechEngr

It's more a matter of not performing factory work...

It's more a matter of not performing factory work without the paperwork. If it's not on the paper it doesn't get done.

It's the adult version of Simon Says. If Simon didn't say "remove the bolts"...
Forum: Accidents and Close Calls
6th Mar 2024, 18:11
Replies: 1,950
Views: 935,845
Posted By MechEngr

"On 6 March, Homendy also said the NTSB has...

"On 6 March, Homendy also said the NTSB has “engaged our attorneys” because Spirit failed to disclose that technicians who performed the rivet rework were not employed by Spirit, but rather by three...
Forum: Accidents and Close Calls
27th Feb 2024, 18:59
Replies: 1,950
Views: 935,845
Posted By MechEngr

ISO 9000 did not require a good process. It...

ISO 9000 did not require a good process. It required the company to follow the processes it has, good or not. Perhaps there has been an upgrade, but we still had workers with angle grinders on the...
Forum: Accidents and Close Calls
27th Feb 2024, 13:46
Replies: 1,950
Views: 935,845
Posted By MechEngr

At my company the response to getting ISO...

At my company the response to getting ISO certification (say what you do, do what you say) saw our QA head destroy 90% of the QA documentation that governed the factory. Can't be found to be not...
Forum: Accidents and Close Calls
27th Feb 2024, 07:48
Replies: 1,950
Views: 935,845
Posted By MechEngr

That report - if they don't name management...

That report - if they don't name management employees who are specifically responsible to make the changes, this is not an effective report. This is the sort of report that creates endless bulleted...
Forum: Accidents and Close Calls
11th Feb 2024, 19:03
Replies: 1,950
Views: 935,845
Posted By MechEngr

With the door in place the structure around the...

With the door in place the structure around the door sees the highest loads possible when pressurized. The door leaving removes the load applied by the door to the surroundings. As to magazines,...
Forum: Accidents and Close Calls
10th Feb 2024, 03:47
Replies: 1,950
Views: 935,845
Posted By MechEngr

It's looking at half a hole; there's no painted...

It's looking at half a hole; there's no painted hole surface along the break that faces the camera. There is a chunk missing from the hole edge as the unsupported edge gave way.

They have photo...
Forum: Accidents and Close Calls
10th Feb 2024, 02:44
Replies: 1,950
Views: 935,845
Posted By MechEngr

I think that V is the boundary between shear...

I think that V is the boundary between shear under compression and shear under tension, not sharpie.

Material inside the V is being piled up from being pushed and outside the V is being stretched...
Forum: Accidents and Close Calls
9th Feb 2024, 19:00
Replies: 1,950
Views: 935,845
Posted By MechEngr

It is a shearing failure. The roller cannot punch...

It is a shearing failure. The roller cannot punch a slot outward as the wall of the slot is only supported on one side. The only initial load that can be applied is at the end of the roller; the rest...
Forum: Accidents and Close Calls
8th Feb 2024, 18:54
Replies: 1,950
Views: 935,845
Posted By MechEngr

There is evidence of where the roller was when...

There is evidence of where the roller was when the fracture happened - the torn off tab has a reverse curvature to it that is below the bolt hole, where the middle arrow is pointing. This is where...
Forum: Accidents and Close Calls
8th Feb 2024, 17:22
Replies: 1,950
Views: 935,845
Posted By MechEngr

From the wire diameter and the depth of the slot...

From the wire diameter and the depth of the slot in the pin I think there is a matching slot in the door stop fitting, allowing 1/4th turn increments on adjusting the stop. That would be enough...
Forum: Accidents and Close Calls
8th Feb 2024, 17:09
Replies: 1,950
Views: 935,845
Posted By MechEngr

Spring rate is largely independent of compression...

Spring rate is largely independent of compression - it changes only a few percent with the change in geometry. We know the spring is near solid when fully compressed and that the maximum load the...
Forum: Accidents and Close Calls
8th Feb 2024, 04:12
Replies: 1,950
Views: 935,845
Posted By MechEngr

If the springs are not sufficient to lift the...

If the springs are not sufficient to lift the door clear of the stops then when closing the door they would have to lift the door to align with the roller guide rather than simply closing the door...
Forum: Accidents and Close Calls
7th Feb 2024, 20:29
Replies: 1,950
Views: 935,845
Posted By MechEngr

The upper and lower bolts were in the picture...

The upper and lower bolts were in the picture shown in figure 14. The upper are clearly visible against the white fittings while the lower ones are the grey blobs on the green background of the hinge...
Forum: Accidents and Close Calls
7th Feb 2024, 16:14
Replies: 1,950
Views: 935,845
Posted By MechEngr

When correctly installed there is a plastic...

When correctly installed there is a plastic bushing that is no longer in that hole. The bushing prevents contact between the hinge guide and the hinge guide bracket.

In this case the stop washer...
Forum: Accidents and Close Calls
7th Feb 2024, 14:12
Replies: 1,950
Views: 935,845
Posted By MechEngr

That looks very much like a smoking gun. Or lit...

That looks very much like a smoking gun. Or lit fuse.
Forum: Accidents and Close Calls
7th Feb 2024, 00:43
Replies: 1,950
Views: 935,845
Posted By MechEngr

Most loads are accelerating the airframe up,...

Most loads are accelerating the airframe up, pushing the door down, harder against the springs. At 16,000 feet they had 5 psi delta; about 4000 lbf against the stops; far more than mild turbulence....
Forum: Accidents and Close Calls
7th Feb 2024, 00:18
Replies: 1,950
Views: 935,845
Posted By MechEngr

Gotcha. Boeing kept on fitting the interior. ...

Gotcha. Boeing kept on fitting the interior.

Then with the interior almost closed up, the rivets are replaced, door is in place, inspector has blinders on as they only inspect what they are...
Forum: Accidents and Close Calls
6th Feb 2024, 20:37
Replies: 1,950
Views: 935,845
Posted By MechEngr

I had no doubt they were recorded and visible, if...

I had no doubt they were recorded and visible, if one zoomed up on them; but on a cell phone screen they are small dots no one is looking for, so no pinching and zooming and scrolling.

Shrink...
Forum: Accidents and Close Calls
6th Feb 2024, 20:25
Replies: 1,950
Views: 935,845
Posted By MechEngr

Looking at the photos and estimating the spring...

Looking at the photos and estimating the spring parameters:
10 coils
.125 inch diameter music wire
1.6 inch OD

Gives a fully compressed load of over 50 lbf per spring and a rate of about 10...
Forum: Accidents and Close Calls
6th Feb 2024, 19:44
Replies: 1,950
Views: 935,845
Posted By MechEngr

If everyone could "see" what was or wasn't there,...

If everyone could "see" what was or wasn't there, there would be no need for checklists. How big would the photo be on a cell phone screen? How many pixels would the fasteners take up? If they were...
Forum: Accidents and Close Calls
3rd Feb 2024, 23:57
Replies: 1,950
Views: 935,845
Posted By MechEngr

Those times passengers have left by the window,...

Those times passengers have left by the window, they functioned as plugs and were exposed to a significant amount of force, around 2.5 tons, due to the pressure difference.

As noted in the Aloha...
Forum: Accidents and Close Calls
3rd Feb 2024, 20:40
Replies: 1,950
Views: 935,845
Posted By MechEngr

On this topic: it was a great thing all near the...

On this topic: it was a great thing all near the door had their seat belts on.
Forum: Accidents and Close Calls
3rd Feb 2024, 05:57
Replies: 1,950
Views: 935,845
Posted By MechEngr

How about staying belted in as much as possible? ...

How about staying belted in as much as possible?

One feature I would like to see, but don't fly enough to know about anymore, is whether the aisle armrests can still be released as that alone is...
Forum: Accidents and Close Calls
1st Feb 2024, 22:12
Replies: 1,950
Views: 935,845
Posted By MechEngr

Just some support here - in the late 1970s I was...

Just some support here - in the late 1970s I was on 737s several times and recall the safety card told to bring the door inside and place it on the seat. It was on later operations that I was...
Forum: Accidents and Close Calls
31st Jan 2024, 06:03
Replies: 1,950
Views: 935,845
Posted By MechEngr

The door vents are to try to equalize pressure in...

The door vents are to try to equalize pressure in the event a front window leaves, so that they can open the door if necessary. There have been cases where additional help in the cockpit was useful...
Forum: Accidents and Close Calls
30th Jan 2024, 04:47
Replies: 1,950
Views: 935,845
Posted By MechEngr

Anyone have a part number for the stop screw?

Anyone have a part number for the stop screw?
Forum: Accidents and Close Calls
28th Jan 2024, 18:55
Replies: 1,950
Views: 935,845
Posted By MechEngr

Even if the roller guide and the hinge guide...

Even if the roller guide and the hinge guide didn't exist, the door fit would still provide the primary locating function. The door fit is unavoidably required; the roller guide and hinge guide are...
Forum: Accidents and Close Calls
28th Jan 2024, 18:00
Replies: 1,950
Views: 935,845
Posted By MechEngr

The door closes into a fuselage skin recess that...

The door closes into a fuselage skin recess that has little clearance side to side, so the entire face of the door provides a location restraint.
Forum: Accidents and Close Calls
26th Jan 2024, 08:22
Replies: 1,950
Views: 935,845
Posted By MechEngr

That is a large amount of airplane to X-ray,...

That is a large amount of airplane to X-ray, particularly on a factory floor with a lot of humans around and the extra intensity to penetrate metal.
Showing results 1 to 35 of 89
 
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