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7th May 2019, 05:18
Replies: 461
Views: 899,439
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: 461
Views: 899,439
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: 5,129
Views: 10,227,216
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: 5,129
Views: 10,227,216
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: 5,129
Views: 10,227,216
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: 5,129
Views: 10,227,216
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: 5,129
Views: 10,227,216
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: 5,129
Views: 10,227,216
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: 5,129
Views: 10,227,216
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: 5,129
Views: 10,227,216
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: 5,129
Views: 10,227,216
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: 5,129
Views: 10,227,216
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: 5,129
Views: 10,227,216
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...
9th Apr 2019, 15:18
Replies: 5,129
Views: 10,227,216
Posted By bsieker

737 Driver, infrequentflyer789, I stand...

737 Driver, infrequentflyer789, I stand corrected. Thanks!

I have amended my previous post.

The posted diagrams are quite inconclusive because the various switches are only labelled with...
9th Apr 2019, 13:34
Replies: 5,129
Views: 10,227,216
Posted By bsieker

Not all opposing electric trim is stopped. Only...

Not all opposing electric trim is stopped. Only main electric (control wheel switch) and autopilot trim. STS is not the autopilot.

And you can also use the...
9th Apr 2019, 12:56
Replies: 5,129
Views: 10,227,216
Posted By bsieker

You can always trim (within electric trim range)...

You can always trim (within electric trim range) in the same direction as control column deflection:



... and ...



So there's a "control-column-actuated-stabilizer-trim-cutout-switch...
9th Apr 2019, 10:03
Replies: 5,129
Views: 10,227,216
Posted By bsieker

Yes, so it will heat up, and eventually the...

Yes, so it will heat up, and eventually the wiring will burn up / melt /otherwise fail. But that will take a while. Being essential, that motor will be dimensioned rather larger to avoid such...
9th Apr 2019, 07:41
Replies: 5,129
Views: 10,227,216
Posted By bsieker

Probably not. What would be the point? It is a...

Probably not. What would be the point? It is a vital pitch control surface. Why would you intentionally make it unavailable because it might fail at some later time? It is better to have it...
9th Apr 2019, 07:32
Replies: 22
Views: 16,710
Posted By bsieker

If you look at how jet engines work, with...

If you look at how jet engines work, with differential pressures across all seals (driving any contaminants away from the gas path, even if seals leak), and from where bleed air is taken (before fuel...
8th Apr 2019, 16:19
Replies: 5,129
Views: 10,227,216
Posted By bsieker

Well, that assumption turned out to be false for...

Well, that assumption turned out to be false for the A330. It was in this spectacular upset, with indicated airspeed < 60 kts, for almost 3 minutes with only short interruptions. During almost the...
8th Apr 2019, 14:45
Replies: 5,129
Views: 10,227,216
Posted By bsieker

I'm not sure what gave you that idea. There are...

I'm not sure what gave you that idea. There are various levels of criticality for different pieces of software.

However, there are bigger issues at stake. MCAS has the potential, without quick and...
8th Apr 2019, 13:39
Replies: 5,129
Views: 10,227,216
Posted By bsieker

That is possibly the worst suggestion so far. ...

That is possibly the worst suggestion so far.

Assembly code is almost impossible to analyse for correctness in any meaningful way. It is far better (and provably so) to write in a well-specified...
8th Apr 2019, 13:25
Replies: 5,129
Views: 10,227,216
Posted By bsieker

In hindsight that is probably a shortcoming of...

In hindsight that is probably a shortcoming of the risk and hazard assessment of the ADIRUs of the A330, yes. But the rationale for regarding all air data invalid at indicated air speed below 60...
8th Apr 2019, 08:56
Replies: 5,129
Views: 10,227,216
Posted By bsieker

In general, the industry does, and overall does a...

In general, the industry does, and overall does a very good job of it. Input value filtering is normal, and even the A330 that nose-dived in cruise had computers which did. It was done...
6th Apr 2019, 13:24
Replies: 80
Views: 57,678
Posted By bsieker

Sure, no problem. And thanks for the operational...

Sure, no problem. And thanks for the operational details.

Bernd
Showing results 1 to 25 of 474
 


 
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