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Search: Posts Made By: HazelNuts39
Showing results 1 to 35 of 77
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Forum: Tech Log
11th Apr 2012, 10:36
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

The obvious reason is that the local static...

The obvious reason is that the local static temperature increases. As the thrust at an RPM as well as the maximum thrust decreases with increasing ambient temperature, it could become insufficient to...
Forum: Tech Log
10th Apr 2012, 16:36
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

An 'annonce' can be in writing, e.g. the small...

An 'annonce' can be in writing, e.g. the small ads in a newspaper. Good point, nevertheless.
Found this in the "Lexique-bilingue" on the Dassault-Aviation website:

ANNONCIATEUR DE MODE DE VOL:...
Forum: Tech Log
7th Apr 2012, 10:51
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

The trigger was that the system detected a sudden...

The trigger was that the system detected a sudden drop in one of the three airspeed values. The "all pitot probe pressures are different" occurred much later at 2:12:xx when the ADR DISAGREE message...
Forum: Tech Log
5th Apr 2012, 10:58
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

That's not what I said or meant. The Airbus...

That's not what I said or meant. The Airbus requirement (ice crystals) in your diagram covers the atmospheric conditions of AF447 (FL350; SAT -38.8). I was thinking about obstructed static ports,...
Forum: Tech Log
5th Apr 2012, 06:52
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

Not all UAS scenarios are as obvious as AF447....

Not all UAS scenarios are as obvious as AF447. The high altitude / ice particle scenario is a relatively recent addition to the family.
Forum: Tech Log
2nd Apr 2012, 21:10
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

PJ2; In AF447 pressure errors developed in...

PJ2;

In AF447 pressure errors developed in the pitot/static system as the AoA exceeded approx. 25 deg, causing the IAS to drop rapidly, to below 60 kt at about 41 deg AoA. I gather that AoA in...
Forum: Tech Log
2nd Apr 2012, 19:39
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

PJ2; Thanks for contributing your valuable...

PJ2;
Thanks for contributing your valuable exercise to the discussion. I was wondering: Do you have to rely on your notes and memory, or does the sim have a facility for recording the flight, e.g....
Forum: Tech Log
2nd Apr 2012, 18:51
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

CONF iture; Strange, my version of PJ2's...

CONF iture;

Strange, my version of PJ2's post reads: The other strange thing about it is that per S/W schedule (the ADR's were turned back on after the stall) the warning should stop at 6.1 deg...
Forum: Tech Log
2nd Apr 2012, 08:55
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

PJ2's sim pitched down with "full forward stick...

PJ2's sim pitched down with "full forward stick applied and held (...) from an AoA of 40deg to 10deg (in) 24 seconds", i.e. at an agonizingly slow rate of 1.25 deg/second. How are you going to...
Forum: Tech Log
31st Mar 2012, 19:45
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

The buffet onset envelope is determined in flight...

The buffet onset envelope is determined in flight test before the type is released into service. It is scheduled in the AFM, the FCOM, the QRH and in the FMEGC. Stall warning is set to occur at an...
Forum: Tech Log
31st Mar 2012, 17:59
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

Maybe you should ask a pilot which I'm not. The...

Maybe you should ask a pilot which I'm not. The trace of V/S Selected on page 111 prior to A/P disconnect shows 0 fpm with regular 'spikes' to -5000 fpm (the much debated 'zipper'). After A/P...
Forum: Tech Log
31st Mar 2012, 16:05
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

mm43; The "high frequency component of an...

mm43;
The "high frequency component of an amplitude increasing to until about 0.1 g peak-to-peak,"(...) "vibrations that might correspond to buffeting" that BEA speaks about on pages 43-44 have a...
Forum: Tech Log
31st Mar 2012, 08:24
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

If you are responding to my post #1084, I suspect...

If you are responding to my post #1084, I suspect we are talking about different things. The airplane encountered "low speed" buffet at 02:10:53 at Mach 0.68. I believe that buffet was caused by "an...
Forum: Tech Log
30th Mar 2012, 21:31
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

No, I don't expect that will be the case. We are...

No, I don't expect that will be the case. We are engaging in an academic discussion that is only remotely relevant to AF447 whose pilots apparently never realized they were in a stalled situation.
...
Forum: Tech Log
30th Mar 2012, 17:31
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

It depends. When you have plenty of altitude you...

It depends. When you have plenty of altitude you would play it safe to avoid secondary stalls.

When the ground is approaching fast, my strategy as a non-pilot engineer would be (I've been shot...
Forum: Tech Log
30th Mar 2012, 08:14
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

The AF447 pilots probably mistook it for an...

The AF447 pilots probably mistook it for an indication of overspeed. At high altitude there isn't any appreciable difference between high-speed and low-speed buffet as both are caused by the same...
Forum: Tech Log
29th Mar 2012, 13:56
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

@TTex600: Same on A330: Picture and description...

@TTex600:
Same on A330: Picture and description of FCU are on page 45 of IR#2.

@Machinbird:
Maybe so, but that doesn't make the English version a correct translation of the French original text.
Forum: Tech Log
29th Mar 2012, 12:24
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

PJ2's reference to IR3, (p72 - 76) made me read...

PJ2's reference to IR3, (p72 - 76) made me read those pages again. I was puzzled by the following reference to the FPV, since the trace on page 107 shows that HDG-VS selected all the time (my...
Forum: Tech Log
28th Mar 2012, 20:50
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

BEA simply describes the condition of the...

BEA simply describes the condition of the airplane, and doesn't in any way suggest that the pilots had that information.

Between 02:11:00 and 02:11:45 PF applied nose-up and nose-down inputs to...
Forum: Tech Log
28th Mar 2012, 19:43
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

jcjeant, That's about the lawyers request...

jcjeant,

That's about the lawyers request (Les principaux extraits...), nothing about the judge's response, nor about BEA's responsibility in this. Doesn't the judge makes his or her own...
Forum: Tech Log
28th Mar 2012, 17:28
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

The sole objective (of BEA's investigation) is to...

The sole objective (of BEA's investigation) is to draw lessons from this occurrence which may help to prevent future accidents. Obviously it needs to be selective in presenting the data that have a...
Forum: Tech Log
26th Mar 2012, 22:11
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

Non surtout ne ne (les) sors pas

Non surtout ne ne (les) sors pas
Forum: Tech Log
25th Mar 2012, 20:53
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

Hmmm, key assumption?? The "on the threshold of...

Hmmm, key assumption?? The "on the threshold of stall warning" trajectory with specific excess thrust (T-D)/W = 0.15 results in level off after 15 s (was 18s) at FL76, Mach 0.51, 295 kCAS, az=2,24 g....
Forum: Tech Log
24th Mar 2012, 09:26
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

It hasn't been tested and therefore, in the...

It hasn't been tested and therefore, in the absence of reliable data, it's really anybody's guess. In the TAROM A-310 incident at Orly the airplane pitched down at (more than) 5°/s, so perhaps 1100...
Forum: Tech Log
23rd Mar 2012, 23:55
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

I may be able to do that, but first I have to...

I may be able to do that, but first I have to explain that I don't necessarily agree with your proposed approach. I agree that you accelerate rapidly when you reduce the AoA to zero lift (or nearly),...
Forum: Tech Log
19th Mar 2012, 12:48
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

Machinbird, Thanks for an interesting...

Machinbird,

Thanks for an interesting reference (http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19770017109_1977017109.pdf).
Forum: Tech Log
18th Mar 2012, 21:44
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

Once the airplane was deeply into the stall, I...

Once the airplane was deeply into the stall, I think a distinction has to be be made between whether the airplane was physically able to recover, and what psychologically the pilots could reasonably...
Forum: Tech Log
17th Mar 2012, 21:20
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

What are your reasons for suspecting that the FD...

What are your reasons for suspecting that the FD causes the second pull up, when the vertical Flight Mode is ALT CRZ, selected altitude is FL350, actual altitude is 37500 ft? I must admit that my...
Forum: Tech Log
16th Mar 2012, 19:40
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

In the A330 the vertical speed indicator is to...

In the A330 the vertical speed indicator is to the right of the altitude tape and counter on the PFD. See for example page 48 of the second interim report. It consists of (1) an analog pointer that...
Forum: Tech Log
15th Mar 2012, 22:20
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

Hi Lyman, I'm impressed. Another quote from...

Hi Lyman,
I'm impressed. Another quote from Interim Report #2:
We don't know if and when all three ADR were rejected by the FCPC's(*), but IMHO it is unlikely to have occurred before 02:11:40. The...
Forum: Tech Log
15th Mar 2012, 20:38
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

No, it isn't.

No, it isn't.
Forum: Tech Log
12th Mar 2012, 07:04
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

The second stall warning came at 02:10:51, 2...

The second stall warning came at 02:10:51, 2 seconds after he began pulling up again.
Forum: Tech Log
11th Mar 2012, 21:57
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

If I may ask as a non-pilot: If you're struggling...

If I may ask as a non-pilot: If you're struggling with roll control and your scan has narrowed to the ADI, is it plausible that you miss pitch altogether? Is it possible that he was aware of...
Forum: Tech Log
11th Mar 2012, 18:30
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

Looking back at an earlier post...

Looking back at an earlier post (http://www.pprune.org/tech-log/466259-af447-final-crew-conversation-thread-no-1-a-66.html#post7019936) makes me wonder whether 20 seconds or so of dead reckoning to...
Forum: Tech Log
4th Mar 2012, 08:07
Replies: 1,353
Views: 298,847
Posted By HazelNuts39

Very attractive at first sight. We just have to...

Very attractive at first sight. We just have to settle on a few details of implementation:
(1) Oh Oh, lost the airspeeds! >>> Based on a single speed (the median)?
(2) Wait, we are in cruise,...
Showing results 1 to 35 of 77
 
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