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Search: Posts Made By: Europa01
Showing results 1 to 35 of 40
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Forum: Accidents and Close Calls
22nd Feb 2024, 17:00
Replies: 1,950
Views: 931,638
Posted By Europa01

AMM

Given that this section of the AMM has been in circulation for a significant length of time you have to wonder why its errors have not been identified and corrected as the errors would have been...
Forum: Accidents and Close Calls
9th Feb 2024, 10:17
Replies: 1,950
Views: 931,638
Posted By Europa01

Yup - I’ll concede they do look flat in that...

Yup - I’ll concede they do look flat in that photo. Correction added to original post.
Forum: Accidents and Close Calls
9th Feb 2024, 08:04
Replies: 1,950
Views: 931,638
Posted By Europa01

https://cimg8.ibsrv.net/gimg/pprune.org-vbulletin/...

https://cimg8.ibsrv.net/gimg/pprune.org-vbulletin/945x889/img_0327_a06f5520d472f9851dd96f20e1d65848901d2914.jpeg

The stop pin faces are convex and the stop pad faces are concave giving a spherical...
Forum: Accidents and Close Calls
8th Feb 2024, 17:34
Replies: 1,950
Views: 931,638
Posted By Europa01

Door Closing

Thinking about this a bit more, whilst pulling the door down, the guide tracks will position the stop pins / pads correctly relative to each other at the top of the door but it is probably necessary...
Forum: Accidents and Close Calls
8th Feb 2024, 07:59
Replies: 1,950
Views: 931,638
Posted By Europa01

Door Closing

I agree about spring force but I’d like to see the action of the guide rollers and guide tracks included in the description of how the door closes. My understanding is that the door is pulled inwards...
Forum: Accidents and Close Calls
7th Feb 2024, 16:24
Replies: 1,950
Views: 931,638
Posted By Europa01

Cable Tie

I can’t agree - surely Boeing’s quality assurance required another cable tie on the other side of the door.

Seriously, if this turns out to be the case you can only imagine the press headlines.
Forum: Accidents and Close Calls
7th Feb 2024, 12:58
Replies: 1,950
Views: 931,638
Posted By Europa01

Lift Assist Spring Force

I’m quoting a quote here but the NTSB preliminary says:-
Overall, the observed damage patterns and absence of contact damage or deformation around holes associated with the vertical movement...
Forum: Accidents and Close Calls
7th Feb 2024, 09:45
Replies: 1,950
Views: 931,638
Posted By Europa01

Lift Assist Spring Force

I can only agree with all these comments on my earlier post (inc scifi & DaveReidUK). As far as I can see we are still left without a convincing explanation for why the door/plug departed when it did...
Forum: Accidents and Close Calls
6th Feb 2024, 20:57
Replies: 1,950
Views: 931,638
Posted By Europa01

Lift Assist Spring Force

I agree - your spring calcs must be in the right ball park. Now we can see that the lift assist force is not enough to lift the door/plug even depressurised. Is the likely reason that closing the...
Forum: Accidents and Close Calls
27th Jan 2024, 20:41
Replies: 1,950
Views: 931,638
Posted By Europa01

Nuts and Bolts

Whoops - forgot to include washer as about to lose Wi-Fi connection so was hurrying. A fine example of a) why critical procedures should not be prepared under unnecessary time constraints and b) the...
Forum: Accidents and Close Calls
27th Jan 2024, 08:56
Replies: 1,950
Views: 931,638
Posted By Europa01

Bolts

It is where I come from but how about:-

THIS TASK TO BE COMPLETED IN ACCORDANCE WITH WORK INSTRUCTION: 707- xxxxxxxxxxx
ALL STEPS TO BE CARRIED OUT AS SPECIFIED AND IN THE ORDER SPECIFIED
PLACE...
Forum: Accidents and Close Calls
25th Jan 2024, 16:31
Replies: 1,950
Views: 931,638
Posted By Europa01

Door Closure

Excellent - almost certainly idiot proof mechanical interlock. On the subject of door mechanics, I think we're almost certain that there were no bolts and as far as I can see there is no convincing...
Forum: Accidents and Close Calls
23rd Jan 2024, 16:00
Replies: 1,950
Views: 931,638
Posted By Europa01

As a practising mechanical engineer of far too...

As a practising mechanical engineer of far too many years I can see the unpleasant attraction of inserting a handy (un)suitable screwdriver, mandrel, sprag, bolt or something when re closing the...
Forum: Accidents and Close Calls
22nd Jan 2024, 19:38
Replies: 1,950
Views: 931,638
Posted By Europa01

Agree with all this post except, and I may be...

Agree with all this post except, and I may be wrong, I think the door has to be pulled inwards for the roller pin to be at the back of the guide fitting ie. before the door is pulled down placing the...
Forum: Accidents and Close Calls
21st Jan 2024, 20:07
Replies: 1,950
Views: 931,638
Posted By Europa01

Bolts and Stops

Agreed - the bolts could not have been sheared (unless they were made of toffee) or now I think of it perhaps some unsuitable temporary sprag which someone forgot to remove could have been...
Forum: Accidents and Close Calls
21st Jan 2024, 15:29
Replies: 1,950
Views: 931,638
Posted By Europa01

Many posts back the plug was stated to weigh 63...

Many posts back the plug was stated to weigh 63 lbs. The lift assist springs clearly lift the plug (photos in previous posts) so they exert more than 63 lbs (otherwise they would just sit in the...
Forum: Accidents and Close Calls
19th Jan 2024, 08:31
Replies: 1,950
Views: 931,638
Posted By Europa01

Empty Seats

Also as ST Dog pointed out in post #1108 “In both cases the wording is vague. No one assigned could mean the actual manifest shows the seats empty, not that no one had a tickets for those seats” . If...
Forum: Accidents and Close Calls
15th Jan 2024, 21:20
Replies: 1,950
Views: 931,638
Posted By Europa01

I think something like this has to explain the...

I think something like this has to explain the initial movement of the door and the damage to the rear hinge guide & door frame. I’d been wondering if the door could have pivoted around the last...
Forum: Accidents and Close Calls
13th Jan 2024, 21:20
Replies: 1,950
Views: 931,638
Posted By Europa01

QA

Unless I’m much mistaken most of this is already in place on modern car production lines. I’m at a total loss to understand why at least a functioning paperwork version of this was not in place for...
Forum: Accidents and Close Calls
13th Jan 2024, 08:49
Replies: 1,950
Views: 931,638
Posted By Europa01

Hinges

As this thread developed it seemed likely to me that the same hinge mechanism would have been used for both EE and the non-exit applications. HOWEVER having seen the photos of two types it is quite...
Forum: Accidents and Close Calls
11th Jan 2024, 17:26
Replies: 1,950
Views: 931,638
Posted By Europa01

Missing Bolts

Agreed. Having empty bolt holes in functioning EE doors certainly looks like a human factors trap when the bolts are so critical to the plug door arrangement.
Forum: Accidents and Close Calls
9th Jan 2024, 20:47
Replies: 1,950
Views: 931,638
Posted By Europa01

Hinge Assembly

Looking at Mudman’s photos it can be seen that the rear hinge guide is at top of its travel with the lift assist spring fully extended. The face of the hinge guide which is at the top photo is the...
Forum: Accidents and Close Calls
8th Jan 2024, 09:56
Replies: 1,950
Views: 931,638
Posted By Europa01

Certainly possible as this appears to be an...

Certainly possible as this appears to be an installation / maintenance cause - presumably the examination of the plug and its guide tracks will clarify this. Whilst thinking about this theory I...
Forum: Accidents and Close Calls
7th Jan 2024, 20:58
Replies: 1,950
Views: 931,638
Posted By Europa01

Locking Mechanism

Looking at the Chris Brady’s still of the outside of the aircraft it can be seen that both hinge posts are still attached to the floor. The hinge guide, the big stop washer, pair of lock nuts and...
Forum: Accidents and Close Calls
7th Jan 2024, 13:25
Replies: 1,950
Views: 931,638
Posted By Europa01

Looks very much as though this and flipfrog’s...

Looks very much as though this and flipfrog’s earlier post are correct. The roller pins in the fuselage frame clearly do engage in the door guide tracks although maybe not as far as you might expect...
Forum: Accidents and Close Calls
6th Jan 2024, 18:01
Replies: 1,950
Views: 931,638
Posted By Europa01

Likely Cause

I’d like to bet that someone in engineering at Boeing will have looked at the photos and already worked out exactly what happened.
Forum: Accidents and Close Calls
2nd Jan 2024, 19:00
Replies: 1,146
Views: 1,048,619
Posted By Europa01

Two things to note from the #257 video: i) after...

Two things to note from the #257 video: i) after the collision there is a large fire just behind the nose of the A350 - burning fuel loaded section of the -8 dragged by the mlg? or maybe just that...
Forum: Rumours & News
29th Mar 2022, 19:36
Replies: 604
Views: 1,071,853
Posted By Europa01

ywagd If you go to the Eaton.com website and...

ywagd
If you go to the Eaton.com website and search on B737 stabilizer trim upgrade there is a sales type technical description of 6355C trim motor. Not sure what your getting at in the context of...
Forum: Rumours & News
30th Sep 2019, 20:32
Replies: 4,656
Views: 4,799,026
Posted By Europa01

I note your reply on the clutch thanks. My logic...

I note your reply on the clutch thanks. My logic for my description of the clutch /trim wheel / stab motor went like this:-

If holding the trim wheel against rotation from the stab motor stops HS...
Forum: Rumours & News
29th Sep 2019, 14:19
Replies: 4,656
Views: 4,799,026
Posted By Europa01

To expand a little :- There will be an out of...

To expand a little :-
There will be an out of trim combination of HS AND position and aircraft speed which generates forces on the jack screw that are so large they can't be overcome by using the...
Forum: Rumours & News
29th Sep 2019, 12:15
Replies: 4,656
Views: 4,799,026
Posted By Europa01

Titter ye not etc. I believe there is a spring...

Titter ye not etc. I believe there is a spring loaded dog type clutch between the stab motor input to the jack screw gearbox and aft cable drum spindle which inputs directly.
Forum: Rumours & News
28th Sep 2019, 22:02
Replies: 4,656
Views: 4,799,026
Posted By Europa01

Titter ye not. Seems I haven't posted enough to...

Titter ye not. Seems I haven't posted enough to upload anything
Forum: Rumours & News
28th Sep 2019, 14:07
Replies: 4,656
Views: 4,799,026
Posted By Europa01

Agreed -this generic schematic shows a clutch. ...

Agreed -this generic schematic shows a clutch.
(sorry couldn't make the jpeg work - will try harder)
Forum: Rumours & News
28th Sep 2019, 12:19
Replies: 4,656
Views: 4,799,026
Posted By Europa01

Indulge me for a moment I'd like to suggest the...

Indulge me for a moment I'd like to suggest the following:-

As a matter of design principle the trim wheels are intended to be able to overcome a runaway stabiliser (i.e. If the stab motor is...
Forum: Rumours & News
8th Jul 2019, 21:54
Replies: 4,656
Views: 4,799,026
Posted By Europa01

Trim wheel forces

Walkon - you make a very good point about jackscrew torque. I think the information available tells us:-

For an aircraft not too far out of trim the trim wheels can just about overcome the Max...
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