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Search: Posts Made By: HazelNuts39
Showing results 1 to 35 of 62
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Forum: Tech Log
9th Jul 2011, 09:21
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Agreed, and everybody seems to think of the...

Agreed, and everybody seems to think of the pitots misreading at high AoA, forgetting that airspeed is derived from the difference between two pressures: pitot and static. Sometime ago someone posted...
Forum: Tech Log
8th Jul 2011, 22:08
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

I don't think it has. According to BEA's Update:...

I don't think it has. According to BEA's Update: Also, there are two ways to move the THS. The first is to push the sidestick forward sufficiently to cause the elevator to move to an AND deflection,...
Forum: Tech Log
8th Jul 2011, 10:32
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

From the BEA Update:Do you assume the captain did...

From the BEA Update:Do you assume the captain did not hear the warning when he entered the Flight Deck?
Forum: Tech Log
7th Jul 2011, 14:30
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

So what? Level at 250?

So what? Level at 250?
Forum: Tech Log
7th Jul 2011, 14:07
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Lonewolf 50; No, I've no ideas about that,...

Lonewolf 50;

No, I've no ideas about that, it's just physics. But why would airspeed not become usable while pitching down?
Forum: Tech Log
7th Jul 2011, 13:52
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Pull up

Recovery - (from FL 350, M.4/130 kCAS, 10,000 fpm at 2:11:40) - a few 'ballpark' figures:

1. First you have to reduce AoA to unstall. Let's say pitch down 30 degrees from 15 NU to 15 ND, 20...
Forum: Tech Log
6th Jul 2011, 21:43
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Mr Optimistic; Pls check your calcs.

Mr Optimistic;

Pls check your calcs.
Forum: Tech Log
6th Jul 2011, 20:08
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Just in case my post #792 (p.40) was unclear: I...

Just in case my post #792 (p.40) was unclear:
I was referring to the point where v/s had been reduced to 700 fpm, before climb was resumed. I believe stall occurred around 02:11:00 just before...
Forum: Tech Log
5th Jul 2011, 07:08
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

At that point they had about 215 kCAS and were...

At that point they had about 215 kCAS and were not stalled. If they had maintained that nose-down push a few seconds longer they would have avoided the stall altogether. Instead they pulled nose-up,...
Forum: Tech Log
4th Jul 2011, 23:16
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

At that point the original UAS condition was no...

At that point the original UAS condition was no longer present, the pitots had returned to normal. But there was anew ADR DISAGREE condition due to high AoA, that also caused the low IAS value.
Forum: Tech Log
4th Jul 2011, 23:06
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

BEA's 275 kCAS at FL350 equates to M=0.808. Yes,...

BEA's 275 kCAS at FL350 equates to M=0.808. Yes, pitching up results in an increase of AoA and vertical acceleration, and FPA, for example AoA=4.5, FPA=5.5, Pitch =10 degrees at about 1.33 g.

All...
Forum: Tech Log
4th Jul 2011, 20:19
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

About 40 seconds later at 2:10:51 the stall...

About 40 seconds later at 2:10:51 the stall warning was triggered again. The airplane probably stalled between 5 - 10 seconds after that, just before reaching its apogee of FL380 at 2:11:06. The...
Forum: Tech Log
4th Jul 2011, 19:18
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Stall warning means that the AoA has exceeded a...

Stall warning means that the AoA has exceeded a threshold that is several degrees below the AoA at which the airplane stalls. Stall warning continues until the AoA is below that threshold value. IMHO...
Forum: Tech Log
3rd Jul 2011, 17:55
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Chris Scott; Just to add a few elements from...

Chris Scott;

Just to add a few elements from the Upset Recovery Training Aid to your as usual excellent explanation:

The use of rudder to correct roll is not advised on large jet transports....
Forum: Tech Log
3rd Jul 2011, 12:40
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

IIRC 'low speed stability' is the only anti-stall...

IIRC 'low speed stability' is the only anti-stall feature left in ALT(1). Is is a 'soft' resistance to stalling, overridable by the pilot. It is lost in ALT(2) in case of failure of 2 ADRs.
Forum: Tech Log
3rd Jul 2011, 11:11
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

A stall ...?

A stall ...?
Forum: Tech Log
3rd Jul 2011, 08:29
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

The original French reads: "Le PF exerce une...

The original French reads: "Le PF exerce une action sur le manche en butée à gauche et à cabrer, qui dure environ 30 secondes."
Perhaps this can be read either way, but if the BEA meant what you...
Forum: Tech Log
3rd Jul 2011, 08:14
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Like feet-on-pedals, the sidestick is not...

Like feet-on-pedals, the sidestick is not normally held in the hand in cruise.
Excellent idea! I wonder if it was ever considered in the design.
Forum: Tech Log
1st Jul 2011, 10:22
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

The manoeuvre is driven entirely by AoA, assuming...

The manoeuvre is driven entirely by AoA, assuming thrust=drag throughout. From time 0, AoA increases linearly in about 3 seconds from the 1g value of about 2.5 degrees to the stall warning threshold...
Forum: Tech Log
30th Jun 2011, 22:44
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Phugoid

Further to my post#545 (p.28), this is how a Phugoid (https://docs.google.com/leaf?id=0B0CqniOzW0rjYjk3N2QyNmItNDdjYy00YzdjLTkwNmQtZTFjMjg3NjY2MDFj&hl=en_GB) looks like.

Any resemblance to the...
Forum: Tech Log
30th Jun 2011, 08:18
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

PJ2; Thanks for replying. Yes, we agree...

PJ2;

Thanks for replying. Yes, we agree completely on what you wrote in your #548 and #559, except for the phrase I quoted and which I may have misunderstood. The only thing I commented on, as a...
Forum: Tech Log
29th Jun 2011, 20:49
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Pitch and power and coffin corner

Ian_w and PJ2;

With all due respect to you both, I cannot fully agree with your views. In my view, disregarding ECAM messages has to do with setting priorities and the different roles that PF and...
Forum: Tech Log
29th Jun 2011, 19:27
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Since the problem may be caused (in part) by...

Since the problem may be caused (in part) by heating (ice particles clinging to heated surfaces), maybe cycling the heat (as ice detectors do) is an option to consider?
Forum: Tech Log
29th Jun 2011, 18:51
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Not rhetorical at all. Stall speeds are...

Not rhetorical at all. Stall speeds are determined power off. The ability to maintain level flight is not part of the definition. Nothing in the report indicates the airplane went below Vs1g....
Forum: Tech Log
29th Jun 2011, 12:44
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Maybe so, but high AoA protection has priority...

Maybe so, but high AoA protection has priority over all others.
Forum: Tech Log
29th Jun 2011, 10:43
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Sensor validation; Does the report say that...

Sensor validation;

Does the report say that airspeed fell below stall speed? IIRC it only stated that airspeed fell below VLS (lowest selectable speed).

The report explicitly states that...
Forum: Tech Log
28th Jun 2011, 13:58
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

There is evidence of turbulence - I think it...

There is evidence of turbulence - I think it caused the "stall warning twice in a row" shortly after 2:10:05. There is evidence of the absence of a strong, sustained updraft that "pushed" the...
Forum: Tech Log
28th Jun 2011, 12:06
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

BOAC; I resign.

BOAC;

I resign.
Forum: Tech Log
28th Jun 2011, 11:28
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Maybe you haven't fully digested my sentence: ...

Maybe you haven't fully digested my sentence: Otherwise, what would you propose for the protection to do once it has been activated?
Forum: Tech Log
28th Jun 2011, 10:46
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

The function of the High AoA protection is to...

The function of the High AoA protection is to keep the airplane out of the stall. So it is entirely logical that this function is activated at an AoA that is sufficiently close to alpha-max so as not...
Forum: Tech Log
28th Jun 2011, 09:44
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

The DFDR data released in the BEA Update point in...

The DFDR data released in the BEA Update point in the direction of an initial climb that was commanded but unintentional and unnoticed. The performance charts you refer to show the rate of climb...
Forum: Tech Log
27th Jun 2011, 15:23
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

DozyWannabe's #451 describes very well my own...

DozyWannabe's #451 describes very well my own thinking on the matter. I've had no professinal involvement with FBW but witnessed that evolution from the sidelines. I saw the evolution from fully...
Forum: Tech Log
27th Jun 2011, 12:47
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Turbulence caused a momentary excursion of "phase...

Turbulence caused a momentary excursion of "phase advanced" AoA beyond alpha-prot, and that put the FCS into alphaprot law (High AoA protection). That protection is lost in Alternate Law 2. I believe...
Forum: Tech Log
27th Jun 2011, 08:43
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

Are you sure? From the AAIB report: In cruise,...

Are you sure? From the AAIB report:
In cruise, VLS is a speed that provides a certain margin (0,3 g?) to buffet onset. The zoom climb occurred because the FCS entered into alpha-prot law and then...
Forum: Tech Log
26th Jun 2011, 14:49
Replies: 1,069
Views: 280,389
Posted By HazelNuts39

A33Zab; Your "Chronology of events @ 5 sec...

A33Zab;

Your "Chronology of events @ 5 sec interval." has a column headed "STALL AoA". I presume that is 'alpha-max', which is not stall AoA but somewhat less. Alphamax varies with Mach number as...
Showing results 1 to 35 of 62
 
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