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Search: Posts Made By: henra
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Forum: Tech Log
14th Jun 2011, 20:31
Replies: 2,070
Views: 613,550
Posted By henra

I seriously hope you are not flying any of those!...

I seriously hope you are not flying any of those!
A twin engine propeller aircraft with a conventional tail will almost 100% sure not stay in an unrecoverable deep stall.
What will be unrecoverable...
Forum: Tech Log
14th Jun 2011, 20:12
Replies: 2,070
Views: 613,550
Posted By henra

JD-EE Honestly I don't know the motivation...

JD-EE

Honestly I don't know the motivation behind it.
It could simply be that they wanted to give some upfront information to the public as the interest in the causes of this accident were...
Forum: Tech Log
13th Jun 2011, 09:53
Replies: 2,070
Views: 613,550
Posted By henra

Hmm, sounds logical at first glance. On the...

Hmm, sounds logical at first glance.
On the other hands sales of transport aircraft is not a spontaneous decision made in the morning at 10am during an Airshow visit.

These are long running...
Forum: Tech Log
13th Jun 2011, 09:21
Replies: 2,070
Views: 613,550
Posted By henra

Agreed that this deduction by the media is...

Agreed that this deduction by the media is baseless and unfounded with the information at hand.
But we should not reduce our level to the one of the mass media.

Please let's discuss it on what...
Forum: Tech Log
12th Jun 2011, 16:54
Replies: 2,070
Views: 613,550
Posted By henra

I would expect that NU input would not unstall...

I would expect that NU input would not unstall the THS as the AoA at the leading edge remains unchanged. And that is where the separation occurs at a stall.What happens downstream won't change that....
Forum: Tech Log
12th Jun 2011, 16:30
Replies: 2,070
Views: 613,550
Posted By henra

I think it is not acceptable to post this kind of...

I think it is not acceptable to post this kind of rubbish about what you call a sub-standard aircraft configuration based on the limited amount of data we have at the moment.
There was a really...
Forum: Tech Log
11th Jun 2011, 08:18
Replies: 2,070
Views: 613,550
Posted By henra

He is probably referring to a different accident....

He is probably referring to a different accident.
In this one it took more than 1 minute to deeply stall the aircraft (Alpha >>10°) and there is no indication it was unrecoverable.
Forum: Tech Log
9th Jun 2011, 19:27
Replies: 2,070
Views: 613,550
Posted By henra

Yes, would probably have been the better...

Yes, would probably have been the better choice....

It is hardly conceivable that this roll momentum would have been so violent that they would have ended upside down within seconds.

And then...
Forum: Tech Log
7th Jun 2011, 20:36
Replies: 2,070
Views: 613,550
Posted By henra

To me it seems there are two aspects to Auto...

To me it seems there are two aspects to Auto Trim.
One is the normal behaviour of 1g Trim.

So the system tries to trim for 1g vertical acceleration.
This can theoretically only happen if the...
Forum: Tech Log
4th Jun 2011, 21:06
Replies: 2,070
Views: 613,550
Posted By henra

Hmmm, are you sure you read the same report as...

Hmmm, are you sure you read the same report as everybody else ?
Where exactly did you read that the automatics quit when they reached their limits of trim and control ???
They quit right at the...
Forum: Tech Log
2nd Jun 2011, 21:53
Replies: 2,070
Views: 613,550
Posted By henra

At the point of stall Flight law Auto- Trim was...

At the point of stall Flight law Auto- Trim was active for all that we know.
The only point where it might have reverted to manual was when Alpha = 30° was exceeded at around 2:11:35.
If the BEA...
Forum: Tech Log
2nd Jun 2011, 10:41
Replies: 2,070
Views: 613,550
Posted By henra

Even if it gets tiring: Could you point me to...

Even if it gets tiring:
Could you point me to any indication the Crew identified that they were in a stall and that it was the THS trim that defeated their vigorous Nose Down command on the elevator...
Forum: Tech Log
29th May 2011, 19:45
Replies: 2,070
Views: 613,550
Posted By henra

JD-EE: Great Post !!!

JD-EE:

Great Post !!!
Forum: Tech Log
29th May 2011, 19:16
Replies: 2,070
Views: 613,550
Posted By henra

Thanks HazelNuts ! Interesting Data Point! ...

Thanks HazelNuts !

Interesting Data Point!

Back in the old thread I did a calculation based on projected surface of an A330 and a weight of 210t:


I have now new empirical data which is...
Forum: Tech Log
29th May 2011, 16:17
Replies: 2,070
Views: 613,550
Posted By henra

That is at least consistent with the way Auto-...

That is at least consistent with the way Auto- Trim is supposed to behave under normal conditions and therefore a likely scenario.

At least before probably entering into Abnormal Law when the AoA...
Forum: Tech Log
29th May 2011, 10:24
Replies: 2,070
Views: 613,550
Posted By henra

Regarding the initial stall warning: and ...

Regarding the initial stall warning:

and
These two paragraphs make me wonder if the stall alarms were really spurious.
At that altitude the buffet margin at M0.82 for G - onset should be around...
Forum: Tech Log
28th May 2011, 12:53
Replies: 2,070
Views: 613,550
Posted By henra

The reference was at FL350 @ ~200t and for the...

The reference was at FL350 @ ~200t and for the Mach assuming still air to show how wide the difference is regarding TAS.

at FL380 it was probably indeed down to 30kts but going there was not a...
Forum: Tech Log
28th May 2011, 12:29
Replies: 2,070
Views: 613,550
Posted By henra

Where do you take the 30kts from? WRT to ground...

Where do you take the 30kts from?
WRT to ground speed the margin is roughly 100kts GS. (~M0,68 - ~M0,86)
The mistake you made is the same one sees over and over again. the 30kts range is IAS. For...
Forum: Tech Log
28th May 2011, 11:17
Replies: 2,070
Views: 613,550
Posted By henra

No nothing wrong with it. You need to...

No nothing wrong with it.
You need to distinguish between the ADR disagree due to the icing which was the event that lastet less than a minute and initiated this accident and the invalid airspeed...
Forum: Tech Log
28th May 2011, 11:05
Replies: 2,070
Views: 613,550
Posted By henra

I was also puzzled about this fact. On the one...

I was also puzzled about this fact. On the one hand the text says A/THR failure.
I am not sure if this is the same as A/THR disconnect or if it strictly means failure.
On the other hand there...
Forum: Tech Log
28th May 2011, 08:41
Replies: 2,070
Views: 613,550
Posted By henra

Hmmm, looking through all the ACARS and the...

Hmmm, looking through all the ACARS and the information we have at the moment I surely must have overseen the part where it was stated that all PRIM's were deactivated. I have seen PRIM1 and SEC1 but...
Forum: Tech Log
28th May 2011, 08:03
Replies: 2,070
Views: 613,550
Posted By henra

The pilots did NOT fight the trim. Please read...

The pilots did NOT fight the trim.
Please read the Report!
They produced/aggravated the trim.
Had they pushed the stick forward the NU trim would have been reduced by the Auto- trim.
There is NO...
Forum: Tech Log
27th May 2011, 21:49
Replies: 2,070
Views: 613,550
Posted By henra

Agreed ! That is indeed a bit mysterious why...

Agreed !
That is indeed a bit mysterious why the 16° NU at that altitude was allowed to develop.
Probably it is linked to the general question why NU was commanded.
Fear of Overspeed after some...
Forum: Tech Log
27th May 2011, 20:59
Replies: 2,070
Views: 613,550
Posted By henra

From GarageYears Link: and ...

From GarageYears Link:


and



So with the double ADR fail even Vsw prot would be lost thereby effectively losing basically all stall protection.

It has to be noted that Alt1+2 are...
Forum: Tech Log
27th May 2011, 20:13
Replies: 2,070
Views: 613,550
Posted By henra

Hmmm, maybe I misinterpreted your post. If that...

Hmmm, maybe I misinterpreted your post. If that is the case, I do apologise.
I understood your post pointing to a non-functioning of attitude indication.
And that is where I get a bit sick and...
Forum: Tech Log
27th May 2011, 19:35
Replies: 2,070
Views: 613,550
Posted By henra

That would be the natural reaction of auto-trim...

That would be the natural reaction of auto-trim to a nose-up command by the PF.
That seems to match the description by BEA that stick-command was predominantly nose-up. Auto-trim wiould try to...
Forum: Tech Log
27th May 2011, 19:26
Replies: 2,070
Views: 613,550
Posted By henra

Ohhh, nooooo! Not again!! Where oh where...

Ohhh, nooooo!
Not again!!

Where oh where does this rubbish with the lost horizon come from????

It has been mentioned time and again that there is not the slightest indication that happened....
Forum: Tech Log
27th May 2011, 19:05
Replies: 2,070
Views: 613,550
Posted By henra

The reply to that question is probably given in...

The reply to that question is probably given in that part of the BEA report:


My explanation:
After the AoA exceeded 40° the airstream to the pitot probably totally collapsed/stalled, leading...
Forum: Tech Log
27th May 2011, 18:17
Replies: 2,070
Views: 613,550
Posted By henra

Sorry if I have to be rude to you: Did you care...

Sorry if I have to be rude to you:
Did you care to read the report of BEA ???

What do you think 'Nose-up Input maintained by the PF' means ??

What is ambiguous about this statement ?

I'm...
Showing results 1 to 29 of 29


 
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