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Search: Posts Made By: bsieker
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Forum: Rumours & News
4th Dec 2018, 16:49
Replies: 2,099
Views: 1,471,742
Posted By bsieker

No, not at all. This has nothing to do with the...

No, not at all. This has nothing to do with the tailplane stalling under positive lift. If the tailplane were so heavily loaded (with an inconceivably far rearward CoG) that it might be close to...
Forum: Rumours & News
4th Dec 2018, 10:46
Replies: 2,099
Views: 1,471,742
Posted By bsieker

Indeed a mystery. The CVR will hopefully shed...

Indeed a mystery. The CVR will hopefully shed some light on it, and provide valuable information on how diagnosing a problem like this can be made easier.

But really, the knowledge that leaving...
Forum: Rumours & News
4th Dec 2018, 10:14
Replies: 2,099
Views: 1,471,742
Posted By bsieker

Thanks, FCeng84. I'll replicate your 4...

Thanks, FCeng84.

I'll replicate your 4 points from before for reference:


Still trying to understand what you are saying: so your point 3. above is really just implicit: they probably didn't...
Forum: Rumours & News
4th Dec 2018, 09:04
Replies: 2,099
Views: 1,471,742
Posted By bsieker

During pitch-up and high-AoA maneuvers (and in...

During pitch-up and high-AoA maneuvers (and in statically stable / dynamically damped aircraft also in neutral flight), the tailplane exerts a downwards force, even in a rearward CoG situation. If it...
Forum: Rumours & News
4th Dec 2018, 07:53
Replies: 2,099
Views: 1,471,742
Posted By bsieker

This would not replace the installed FDR/CDR, but...

This would not replace the installed FDR/CDR, but complement it, with somewhat lower dependability requirements, rather more on the level of QARs already installed in most aircraft anyway. But in...
Forum: Rumours & News
4th Dec 2018, 07:37
Replies: 2,099
Views: 1,471,742
Posted By bsieker

For an engineering description (going by your...

For an engineering description (going by your username) this seems oddly vague.

Do all these things have to happen exactly in order? That would mean MCAS would never do more than one trim...
Forum: Rumours & News
28th Nov 2018, 13:10
Replies: 2,099
Views: 1,471,742
Posted By bsieker

This confuses me. The 737 (all versions) has...

This confuses me. The 737 (all versions) has direct mechanical flight controls (hydraulically assisted). They have no provision for "using" air data of any kind, except for the strength of the...
Forum: Rumours & News
28th Nov 2018, 07:44
Replies: 2,099
Views: 1,471,742
Posted By bsieker

Possibly true, but largely irrelevant, because...

Possibly true, but largely irrelevant, because this could as well have happened on the first flight with the AoA problem.


There was no checklist for "unexpected MCAS trim", only for runaway...
Forum: Rumours & News
27th Nov 2018, 14:05
Replies: 2,099
Views: 1,471,742
Posted By bsieker

[/left] Perhaps. But it is much better to have...

[/left]
Perhaps. But it is much better to have an aircraft where this cannot happen at any airline.

There are always multiple factors, and if either of them can be fixed, it reduces the total...
Forum: Rumours & News
27th Nov 2018, 10:42
Replies: 2,099
Views: 1,471,742
Posted By bsieker

True, maintenance and operations will most likely...

True, maintenance and operations will most likely be found to be causal factors in this one, but so will the possible lack of adequate briefing for a new system and also the engineering design of...
Forum: Rumours & News
16th Nov 2018, 11:16
Replies: 2,099
Views: 1,471,742
Posted By bsieker

In hindsight you can often find issues with...

In hindsight you can often find issues with annunciations, but it is a highly non-trivial problem. Cognitive overload is a huge issue, and a lot of effort is put into answering the questions of what...
Forum: Rumours & News
15th Nov 2018, 12:49
Replies: 2,099
Views: 1,471,742
Posted By bsieker

Because it has not been established that...

Because

it has not been established that MCAS operation was a causal factor in this accident and
even if it were, it has not been established that knowledge of MCAS operation would then have...
Forum: Rumours & News
15th Nov 2018, 07:44
Replies: 2,099
Views: 1,471,742
Posted By bsieker

The diameter of the GTF is not necessarily the...

The diameter of the GTF is not necessarily the (only) reason: the LEAP isn't really significantly smaller. Both are very-high bypass turbofan engines, they just achieve the low fan rpm by different...
Forum: Rumours & News
13th Nov 2018, 13:57
Replies: 2,099
Views: 1,471,742
Posted By bsieker

Perhaps. I'm not judging the MCAS either way, I...

Perhaps. I'm not judging the MCAS either way, I was just trying to clear up the misconception that the stick shaker was designed to be used as a failure indicator, whereas here it was just an...
Forum: Rumours & News
13th Nov 2018, 13:51
Replies: 2,099
Views: 1,471,742
Posted By bsieker

That's really the epitome of double-think: "This...

That's really the epitome of double-think: "This airplane crashed and killed almost 200 people because of a Boeing system idiosyncrasy, but Boeing is better than Airbus, because this other accident...
Forum: Rumours & News
13th Nov 2018, 11:54
Replies: 2,099
Views: 1,471,742
Posted By bsieker

This misconception has been floating around for...

This misconception has been floating around for long. The stick shaker is not an annunciation of a sensor failure.

It is the normal approach-to-stall warning triggered by a high AoA value. It does...
Forum: Rumours & News
12th Nov 2018, 08:41
Replies: 2,099
Views: 1,471,742
Posted By bsieker

I don't know if it has been changed for the MAX...

I don't know if it has been changed for the MAX (probably not), so the following is for the NG:

The stick shaker has multiple inputs. Primarily AoA, but also other ADIRU inputs, thrust, flap/slat...
Forum: Rumours & News
12th Nov 2018, 08:27
Replies: 2,099
Views: 1,471,742
Posted By bsieker

The stick shaker is simply caused by a high AoA...

The stick shaker is simply caused by a high AoA reading, regardless of its validity, which, in this particular case can be a symptom of a faulty sensor, when otherwise there are no indications of a...
Forum: Rumours & News
12th Nov 2018, 07:59
Replies: 2,099
Views: 1,471,742
Posted By bsieker

If the computer could decide that one was "out of...

If the computer could decide that one was "out of range", it should also decide not to use it as an input to any kind of stall-prevention or stability assistance function, or whatever it is called.
...
Forum: Rumours & News
12th Nov 2018, 07:57
Replies: 2,099
Views: 1,471,742
Posted By bsieker

Qantas Flight 72...

Qantas Flight 72 (https://en.wikipedia.org/wiki/Qantas_Flight_72), as mentioned before.

Although the aircraft did not crash, it was nevertheless an accident, because there were several serious...
Forum: Rumours & News
12th Nov 2018, 07:44
Replies: 2,099
Views: 1,471,742
Posted By bsieker

I think all this is missing the point. The...

I think all this is missing the point. The problems mostly occur when AoA data is faulty. So what is displaying the faulty data going to achieve?

As I see it there are two possibilities:

AoA...
Forum: Rumours & News
9th Nov 2018, 14:04
Replies: 2,099
Views: 1,471,742
Posted By bsieker

We should keep in mind that this is an Emergency...

We should keep in mind that this is an Emergency Airworthiness Directive. The point here is to get what is perceived to be critical information out to the operators as fast as possible. In the course...
Forum: Rumours & News
9th Nov 2018, 06:50
Replies: 2,099
Views: 1,471,742
Posted By bsieker

The "animal" in humans does quite definitively...

The "animal" in humans does quite definitively NOT understand or feel the physical reality of three-dimensional flight. Not even close.

I recommend this report by the ATSB...
Forum: Rumours & News
8th Nov 2018, 11:15
Replies: 2,099
Views: 1,471,742
Posted By bsieker

EASA has adopted/re-published the FAA EAD without...

EASA has adopted/re-published the FAA EAD without change:
https://ad.easa.europa.eu/ad/US-2018-23-51

I guess that means it applies to European operators, as well.


Bernd
Forum: Rumours & News
5th Nov 2018, 07:55
Replies: 2,099
Views: 1,471,742
Posted By bsieker

And what is the purpose of this post? We don't...

And what is the purpose of this post? We don't even know what happened, and yet you already assert that the flight crew screwed up. Oh, if only we could find enough pilots who never make any mistake,...
Forum: Rumours & News
1st Nov 2018, 00:30
Replies: 2,099
Views: 1,471,742
Posted By bsieker

Sometimes their list defaults to having "C" (for...

Sometimes their list defaults to having "C" (for crash) occurrences disabled when loading the front page. Just click on the red "C" button on top (the row of colored buttons after "Filter:") and it...
Forum: Rumours & News
31st Oct 2018, 14:13
Replies: 2,099
Views: 1,471,742
Posted By bsieker

A good read, thanks. I wonder how well his model...

A good read, thanks. I wonder how well his model holds up for abnormal attitudes.

My guess is: not at all, seeing the various iterations they had to go through to get even normal flight attitudes...
Forum: Rumours & News
31st Oct 2018, 13:36
Replies: 2,099
Views: 1,471,742
Posted By bsieker

A number of reasons, one of the simplest is so...

A number of reasons, one of the simplest is so that they don't get blown off in a storm.

Another is that it will make people skip the checks, statistically only slightly more often than with...
Showing results 1 to 28 of 28


 
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