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Search: Posts Made By: bsieker
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25th Mar 2022, 09:33
Replies: 563
Views: 946,668
Posted By bsieker

Officials at the press conference (in the CGTN...

Officials at the press conference (in the CGTN live stream linked above) just stated that they were going to release the report(s) in English, as well as Chinese. Chinese is an ICAO working language,...
22nd Mar 2022, 18:12
Replies: 563
Views: 946,668
Posted By bsieker

[in reply to a questions about Chinese accident...

[in reply to a questions about Chinese accident investigation quality]



I agree. Also keep in mind that under ICAO rules they are required to allow representatives from the country of aircraft...
22nd Mar 2022, 14:17
Replies: 563
Views: 946,668
Posted By bsieker

The recorders will almost certainly not be...

The recorders will almost certainly not be serviceable, i. e. they will be destroyed and will not work.

But the memory modules will almost certainly still be readable; they are in some of the...
8th Mar 2021, 16:37
Replies: 285
Views: 216,551
Posted By bsieker

That's thermoacoustic imaging...

That's thermoacoustic imaging (https://en.wikipedia.org/wiki/Thermoacoustic_imaging). That wikipedia article links to the article about the P&W technique called thermal acoustic imaging...
8th Mar 2021, 07:11
Replies: 285
Views: 216,551
Posted By bsieker

Not exactly. It is well-known that such internal...

Not exactly. It is well-known that such internal cracks can cause catastrophic blade failures.


Internal cracks is exactly what the Thermal-Acousting Imaging process is designed to find, before...
24th Feb 2021, 11:02
Replies: 32
Views: 28,532
Posted By bsieker

Turbine blades have been hollow for a very long...

Turbine blades have been hollow for a very long time, much longer than fan blades. For different reasons (cooling), but still.
24th Feb 2021, 09:35
Replies: 285
Views: 216,551
Posted By bsieker

DaveReidUK That is probably related to the...

DaveReidUK

That is probably related to the Netherlands incident, which was a PW4000-powered B744. There is little information available, but it looks like multiple turbine blades and/or vanes (and...
24th Feb 2021, 09:28
Replies: 32
Views: 28,532
Posted By bsieker

It's a technical term concerning the energy and...

It's a technical term concerning the energy and direction of the fragments that leave the engine. It is of crucial importance for certification and also important to the integrity of the rest of the...
23rd Feb 2021, 14:05
Replies: 285
Views: 216,551
Posted By bsieker

Dan Winterland What makes you think it was a...

Dan Winterland

What makes you think it was a part of the fan blade that struck the fairing? Lots of other pieces fell off from the nacelle.

And is that really true about forward ejection? It...
23rd Feb 2021, 13:35
Replies: 285
Views: 216,551
Posted By bsieker

billovitch There are several fundamental...

billovitch

There are several fundamental problems with that idea: what would hold such a band or cord in place? If it is attached to the blades, it only increases the weight of the blades, and...
23rd Feb 2021, 12:27
Replies: 285
Views: 216,551
Posted By bsieker

Less Hair Possible damage to some bolts and...

Less Hair

Possible damage to some bolts and some superficial scratches. This will undergo a very detailed and careful inspection but my first guess would be that the airframe structure was not...
23rd Feb 2021, 08:30
Replies: 285
Views: 216,551
Posted By bsieker

Less Hair The airplane was not hit by...

Less Hair

The airplane was not hit by high-energy fragments. Those would have gone straight through. A non-structural fairing was hit by a low-energy fragment. Not something you want, but not a...
23rd Feb 2021, 08:25
Replies: 285
Views: 216,551
Posted By bsieker

darobstacraw The PW4077 as used on the...

darobstacraw

The PW4077 as used on the 777-200 is a unique sub-variant as it is the only one to use hollow titanium alloy fan blades (similar to many RR Trent engines).

The 744 case in...
23rd Feb 2021, 07:52
Replies: 32
Views: 28,532
Posted By bsieker

Looking at the latest picture on avherald: ...

Looking at the latest picture on avherald:
https://cimg7.ibsrv.net/gimg/pprune.org-vbulletin/750x563/longtail_b744_vq_bwt_maastricht_210220_6_7b0deeb6797a6a5401a844e2d2c780d1a710cd88.jpg
which...
22nd Feb 2021, 21:52
Replies: 848
Views: 866,856
Posted By bsieker

Longtimer Yes they did, at a truly alarming...

Longtimer

Yes they did, at a truly alarming rate.

Of the 737-200, around 1000 were built, and over 120 of them suffered hull-loss accidents, although not all of them fatal.

Roughly 2000...
21st Feb 2021, 11:39
Replies: 285
Views: 216,551
Posted By bsieker

blancolirio channel said that the fire continued...

blancolirio channel said that the fire continued on the ground. Assuming all shutoff valves worked, all fuel in the engine should have burned off by the time and/or been flushed out, so I think it...
21st Feb 2021, 11:36
Replies: 285
Views: 216,551
Posted By bsieker

It is not a structural part, and as such is a...

It is not a structural part, and as such is a very lightweight honeycomb structure and has a large surface area. So yes, rather parachute-y.
21st Feb 2021, 11:20
Replies: 285
Views: 216,551
Posted By bsieker

clareprop Nobody argues that it was not a...

clareprop

Nobody argues that it was not a catastrophic failure, but "uncontained" vs. "contained" have specific technical meanings for a good reason. No matter what the press calls it, we should...
10th Feb 2021, 11:50
Replies: 848
Views: 866,856
Posted By bsieker

Indeed, the OM says in the Autothrottle System...

Indeed, the OM says in the Autothrottle System description:

So I would expect this to be common knowledge among 737 Classic drivers.

I wonder where the seemingly widespread idea originates that...
10th Feb 2021, 08:55
Replies: 848
Views: 866,856
Posted By bsieker

And the problems were "fixed" by cleaning the...

And the problems were "fixed" by cleaning the contacts. This is reminiscent of the "fixes" done to the Inertial Reference Systems before the AdamAir accident in 2007. From the Final Report...
16th Sep 2019, 09:49
Replies: 6
Views: 5,792
Posted By bsieker

Yes, but according to the announcer on the...

Yes, but according to the announcer on the meeting, they only had light injuries and I think they were taken to hospital only for observation to make sure they didn't suffer from any late...
16th Sep 2019, 09:10
Replies: 6
Views: 5,792
Posted By bsieker

I was there, and also took some photos. I have no...

I was there, and also took some photos. I have no problems posting them when there are no serious injuries or deaths, but they don't really show a lot more than the press photos.

There's some...
7th May 2019, 05:18
Replies: 483
Views: 986,503
Posted By bsieker

Very unlikely for a short-haul airliner. They...

Very unlikely for a short-haul airliner. They usually can land at maximum takeoff weight (or very slightly less) without any problems to allow very short hops without the need to refuel at every...
6th May 2019, 16:35
Replies: 483
Views: 986,503
Posted By bsieker

Not sure about that "far less fuel" on board,...

Not sure about that "far less fuel" on board, because 6,750 kg of fuel did leak, and it was probably sheer luck that it did not ignite. To be precise, the fuel apparently did not leak from the tanks,...
12th Apr 2019, 13:18
Replies: 5,120
Views: 10,810,202
Posted By bsieker

I find it quite remarkable that it takes such a...

I find it quite remarkable that it takes such a long windup to finally conclude that the crew did not do everything perfectly. Duh. No human ever does.

And then it just stops. What is the point of...
12th Apr 2019, 10:16
Replies: 5,120
Views: 10,810,202
Posted By bsieker

Well, sure, there's also terrain, overrun areas,...

Well, sure, there's also terrain, overrun areas, possible emergency landing locations and whatnot, but I didn't want to make it longer than it already was. I could have added "and other parameters"...
12th Apr 2019, 10:14
Replies: 5,120
Views: 10,810,202
Posted By bsieker

Yes, It was perhaps a bit unfair towards...

Yes, It was perhaps a bit unfair towards Professor Nickelsburg, and I apologise. What annoyed me is that Bloomberg even put it in the context of the accidents, even going so far as to claim that "it...
12th Apr 2019, 08:05
Replies: 5,120
Views: 10,810,202
Posted By bsieker

That's just a red herring. It talks about "short...

That's just a red herring. It talks about "short runways". Nobody in their right mind would think a 3700 m runway was short. It is a sales pitch for the MAX 7, and it has nothing at all to do with...
11th Apr 2019, 09:13
Replies: 5,120
Views: 10,810,202
Posted By bsieker

Thank you. I agree completely. I would add...

Thank you. I agree completely.

I would add to the list of references any of Sidney Dekker's works, in particular The Field Guide to Understanding 'Human Error'...
10th Apr 2019, 18:25
Replies: 5,120
Views: 10,810,202
Posted By bsieker

Have you ever looked at the nose of an A350? It...

Have you ever looked at the nose of an A350? It clearly has a lot of mechanical vanes, three alone for sideslip angle, and some combined probes (pitot plus mechanical vane). Same for the A380. So no,...
10th Apr 2019, 16:02
Replies: 5,120
Views: 10,810,202
Posted By bsieker

And what do you think is the reason the use of...

And what do you think is the reason the use of these is not more widespread? I would assume that the main reasons are: mechanical vanes are straightforward, and a standby instrument can just display...
10th Apr 2019, 14:50
Replies: 5,120
Views: 10,810,202
Posted By bsieker

And what are the alternatives to angle of attack...

And what are the alternatives to angle of attack vanes? Would you mind showing us your engineering analysis for use on commercial airliners, and the hazard and risk assessment showing that they are...
10th Apr 2019, 12:58
Replies: 5,120
Views: 10,810,202
Posted By bsieker

The line referring to the alpha vanes explicitly...

The line referring to the alpha vanes explicitly only lists Original and Classic models (-100/-200/-300/-400/-500). Not NG (or MAX).

Bernd
10th Apr 2019, 12:47
Replies: 5,120
Views: 10,810,202
Posted By bsieker

I don't recall anyone having said that there is a...

I don't recall anyone having said that there is a delay between fulfillment of MCAS activation criteria and the (first) trim input. There is only a 5 second inhibition of further trim inputs after...
10th Apr 2019, 12:43
Replies: 5,120
Views: 10,810,202
Posted By bsieker

Yes, and this has been discussed a dozen times...

Yes, and this has been discussed a dozen times here. Of course one reason for the certification requirement for certain control forces at increasing angles of attack is there to make it harder to...
Showing results 1 to 35 of 496
 


 
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