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Search: Posts Made By: HazelNuts39
Showing results 1 to 35 of 218
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Forum: Tech Log
22nd Apr 2011, 11:29
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

IIRC, in the weeks following the accident, AF CEO...

IIRC, in the weeks following the accident, AF CEO explained to the press that AF Maintenance first looked at the ACARS messages when they began routine preparations for the arrival of the flight in...
Forum: Tech Log
22nd Apr 2011, 10:28
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Chris, To begin with the last point, if a...

Chris,

To begin with the last point, if a pitot tube is blocked, but the drain hole(s) and the static are clear, that is very likely to result in an under-reading of airspeed. That was the case in...
Forum: Tech Log
21st Apr 2011, 07:06
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Khashoggi: PS: Just a flimsy...

Khashoggi:



PS: Just a flimsy illustration (https://docs.google.com/leaf?id=0B0CqniOzW0rjMTU0MDQyNzYtN2M2Yy00MzVkLWFhZWYtZmI1NGU4MjdjMTY5&hl=en_GB&authkey=COmi6eIM) to BJ-ENG's post.
Forum: Tech Log
20th Apr 2011, 08:29
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

The aerodynamics of the vertical tailplane are...

The aerodynamics of the vertical tailplane are similar to those of a wing: the drag force is of the order of one-twentieth of the sideforce (lift). And, as you say:


EDIT:: I.e. 0.8 m laterally...
Forum: Tech Log
19th Apr 2011, 13:32
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Stalled?

According to the ATSB incident report: Stall protection activated, stall warning and stickshaker activated, and indicated AoA reached 10.5 degrees.

The report doesn't say that the airplane...
Forum: Tech Log
15th Apr 2011, 22:07
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Just a guess: I think we are looking at the upper...

Just a guess: I think we are looking at the upper skin of the left wing tip, with aileron hinge brackets. The structure in the background could be a slat.
Forum: Tech Log
15th Apr 2011, 20:42
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Just to keep it simple, in water as in air, three...

Just to keep it simple, in water as in air, three forces and their moments are at play on a free-falling body: Weight, buoyancy and fluid dynamic force. Buoyancy is equal to the weight of the...
Forum: Tech Log
15th Apr 2011, 20:20
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Lonewolf; Look also at what appears to be wing...

Lonewolf;
Look also at what appears to be wing lower skin attached to MLG, with tank access holes.
Forum: Tech Log
14th Apr 2011, 12:22
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Speculation, hypotheses, fine with me, as long as...

Speculation, hypotheses, fine with me, as long as they make sense and open new perspectives on what might have happened. If they just go around in circles, repeating 'ad nauseam' what has been...
Forum: Tech Log
14th Apr 2011, 10:58
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

PJ2 and Bergerie1; I believe that the...

PJ2 and Bergerie1;

I believe that the aerodynamic 'mechanism' that I described in post #3447 is the same for high speed buffet and low speed buffet. The curves in the buffet boundary graph...
Forum: Tech Log
13th Apr 2011, 19:34
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Lonewolf_50; I believe pre-stall buffet at...

Lonewolf_50;

I believe pre-stall buffet at high altitude is (at least in part) a cyclic phenomenon. The airflow becomes locally supersonic in the 'peaky' part of the pressure distribution on the...
Forum: Tech Log
13th Apr 2011, 18:33
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Lonewolf_50; The purpose of my post was to...

Lonewolf_50;

The purpose of my post was to dispel a few popular misperceptions about stalling. As to what did happen, I adopt PJ2's wise words that we simply have to wait for CVR and DFDR to tell...
Forum: Tech Log
13th Apr 2011, 16:50
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Not surprising perhaps, but 'maintain pitch and...

Not surprising perhaps, but 'maintain pitch and power' is designed to avoid that, and usually does.
Forum: Tech Log
13th Apr 2011, 15:08
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

About stalling, generally speaking

Since we're likely to get into this again and again, a few words on stalling (apologies to all those for whom the following contains nothing they don't already know, several elements having been...
Forum: Tech Log
13th Apr 2011, 14:11
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Agreed, and not unreasonable too, but not a fact,

Agreed, and not unreasonable too, but not a fact,
Forum: Tech Log
13th Apr 2011, 11:26
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Where did you read that?

Where did you read that?
Forum: Tech Log
12th Apr 2011, 08:23
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

A double engine flameout after 2:14:26 would have...

A double engine flameout after 2:14:26 would have enabled the airplane to end up beyond The Circle. Evidently it didn't, so why theorize about that possibility?
Forum: Tech Log
11th Apr 2011, 20:24
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

CPC

PJ2;

Thank you for collecting and sharing so much fascinating information!

One question comes to mind. In order to generate the 1.5 minute advance warning, the CPC's need aircraft altitude (or...
Forum: Tech Log
11th Apr 2011, 17:30
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Hi Olivier, Thanks for your informed and...

Hi Olivier,

Thanks for your informed and elaborate reply. I've just one question. As far as I could find in the available documentation, the CPC has only one source for cabin pressure, i.e. its...
Forum: Tech Log
11th Apr 2011, 14:08
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Yes, Olivier, we discussed this at length...

Yes, Olivier,

we discussed this at length some time ago. The options are:

- if the negative relief valve opened, it is irrelevant what the cabin pressure control was doing.

- if it did not...
Forum: Tech Log
11th Apr 2011, 11:37
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

JD-EE; I seem to remember, but can't find...

JD-EE;

I seem to remember, but can't find the source right now, that:

- Somewhere in report #1 or #2, BEA says that all messages passed through the same satellite, and names that satellite. The...
Forum: Tech Log
10th Apr 2011, 09:03
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

In that case, what significance does it have in...

In that case, what significance does it have in the accident sequence?

And no damage anywhere else on fin, rudder and hinges?
Forum: Tech Log
9th Apr 2011, 19:04
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Hi Chris; As I replied to JPI33600, it's...

Hi Chris;

As I replied to JPI33600, it's basic flight mechanics, nothing more. I didn't look into the aspects you mention and expect that others, more qualified than I am in those things, will do...
Forum: Tech Log
9th Apr 2011, 16:20
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

JPI33600; It's just Flight Mechanics...

JPI33600;

It's just Flight Mechanics expanding on yours. Hopefully the DFDR and CVR will tell us what happened and why.
Forum: Tech Log
9th Apr 2011, 15:38
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

More turn radius

JPI33600;

Perhaps you would like to also look at a spiral dive. For 205t, FL350, M.82 the max. available loadfactor in normal law is n=1.662 corresponding to a bank angle of 53 degrees in a...
Forum: Tech Log
9th Apr 2011, 11:03
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Any thoughts as to how (at FL350) "the weather...

Any thoughts as to how (at FL350) "the weather alone would put suddenly this aircraft (in or) close to an "upset" attitude" in pitch, roll or yaw?

Regards,
HN39

PS1:: To illustrate what I have...
Forum: Tech Log
9th Apr 2011, 09:37
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Using full rudder would help getting the nose...

Using full rudder would help getting the nose down. You didn't forget to extend the flaps on the other wing to permit rolling it back to wings level?
Forum: Tech Log
9th Apr 2011, 09:13
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

It seems "loss of control" is now amply...

It seems "loss of control" is now amply explained.

How about arm '36g'?
Forum: Tech Log
8th Apr 2011, 16:05
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

bearfoil, I fear you need to go back to...

bearfoil,

I fear you need to go back to BEA's Report No.2, and to the extensive discussions we have had earlier on this thread. The V/S has three pairs of attachments. The front pair stayed with...
Forum: Tech Log
8th Apr 2011, 08:46
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Colours on meteosat images

For the interested reader there is more information in BEA Report No.1 Appendix 1 and Report No.2 Appendix 3. The first reference has this Note:
Forum: Tech Log
8th Apr 2011, 06:44
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

TCAS FAULT message

BEA Interim Report No.2, 1.6.11.6 Consequences of a drop in the measured total pressure, explains that a sudden drop in measured total pressure entails a sudden drop (300 ft) in indicated altitude,...
Forum: Tech Log
7th Apr 2011, 11:24
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

That it would do that is not in dispute, nor that...

That it would do that is not in dispute, nor that the extended gear would separate at high enough forward speed. (Some "deep stall" or "flat spin" adepts postulate near-zero forward speed). What I...
Forum: Tech Log
7th Apr 2011, 10:28
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Automatic trim

I believe you are referring to the A320 accident at Perpignan. In that accident the condition you describe developed because the AoA vanes were inoperative. If those vanes are free to move, automatic...
Forum: Tech Log
7th Apr 2011, 09:54
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

Shear pin

The rear attachment of the pylon of wing-mounted engines incorporates a shear pin. It is designed to break when the engine is hit from below in a crash, and allows the pylon and engine to pitch up...
Forum: Tech Log
6th Apr 2011, 22:08
Replies: 3,893
Views: 1,537,508
Posted By HazelNuts39

milsabords; BEA's Interim Report No.2...

milsabords;

BEA's Interim Report No.2 identifies the Make and model of the DFDR and says about the parameters: "The decoding document, supplied with this airplane, has around 1,300 parameters." It...
Showing results 1 to 35 of 218
 
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