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Search: Posts Made By: HazelNuts39
Showing results 1 to 35 of 48
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Forum: Tech Log
9th Aug 2011, 20:13
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Interesting as personal preferences as to what...

Interesting as personal preferences as to what autotrim should do or not do may be, I fail to understand what relevance to AF447 these have. Between 02:11:40 and 02:12:10 the PF pulled the sidestick...
Forum: Tech Log
9th Aug 2011, 11:09
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Angle of attack data processing algorithms

According to the ATSB interim accident report on QF72, the FCPC treats AoA differently from the other parameters (which was an important factor in the QF72 occurrence):
Forum: Tech Log
5th Aug 2011, 21:29
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Page 45 again

For me the previous two graphs (thanks for your comments) were just 'stepping stones' to the graph I was working on: AF447 cL-alpha prior to and post-stall...
Forum: Tech Log
5th Aug 2011, 15:46
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Yes it does. I chose a wind speed and direction...

Yes it does. I chose a wind speed and direction that produced a match between the calculated Mach and the recorded Mach pior to the airplane going to very large AoA, keeping an eye on the wind...
Forum: Tech Log
5th Aug 2011, 14:23
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

LF vs AoA

For whom it may interest: a crossplot of normal load factor (gee) against AoA at entry into stall from the graph on page 45 of the french report #3 - LF vs AoA at stall entry...
Forum: Tech Log
5th Aug 2011, 11:32
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

JD-EE; Agreed, almost. If you have AoA or next...

JD-EE; Agreed, almost. If you have AoA or next best, valid stall warning on/off as a substitute of it, I would put leveling the wings third. If you let yourself be guided by AoA, you don't really...
Forum: Tech Log
5th Aug 2011, 09:58
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Roll control is problematic in the stall. When...

Roll control is problematic in the stall. When you're stalled, unstall first, then level the wings.
Forum: Tech Log
5th Aug 2011, 08:20
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Airspeed from groundspeed

Hi takata,
Airspeed from groundspeed, V/S, windspeed and temperature is shown on this graph: CASfromGS...
Forum: Tech Log
4th Aug 2011, 13:06
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Hi takata, With reference to this question and...

Hi takata,
With reference to this question and your reply, how do you explain (on page 112 of the french report, also on page 113) the cycling of 'Mach selecté' between 02:00:00 and 02:09:55? Is...
Forum: Tech Log
4th Aug 2011, 00:40
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

The altitude tape scrolling down at an unusual...

The altitude tape scrolling down at an unusual rate, the 'vario' at the negative peg?
Forum: Tech Log
3rd Aug 2011, 23:43
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Correct, but don't forget that static pressures...

Correct, but don't forget that static pressures are affected also, reading high. Pitot minus static can become negative in extreme cases, as mentioned in one of the BEA reports.
Forum: Tech Log
3rd Aug 2011, 21:57
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Stall warning drop-out

Let's put this into perspective. Certification requirements, airplane systems design and airline pilot's training primarily seek to avoid stalling the airplane. Limiting myself to system design,...
Forum: Tech Log
1st Aug 2011, 08:31
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

That's another intriguing thing. The ADR's...

That's another intriguing thing. The ADR's calculate Mach and CAS quasi-simultaneously from the same pitot and static pressures. Why would there be a delay of two seconds between Mach and CAS?
...
Forum: Tech Log
31st Jul 2011, 10:04
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Events around AP disconnect

With the DFDR data released in Interim Report no.3, it is now time to add a few observations to my july 10 post #30 on page 2 of this thread. While the earlier post was for still air, the new element...
Forum: Tech Log
30th Jul 2011, 22:56
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

More on V/S

PJ2 and DJ77, my thanks to you both. I understand that the recorded changes of selected V/S do not indicate a pilot action, and have no effect on the aircraft with AP OFF. Would they affect the FD...
Forum: Tech Log
30th Jul 2011, 21:26
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Hi Takata, Txs for yr kind reply. Do I note...

Hi Takata,

Txs for yr kind reply. Do I note correctly from the picture of the ISIS that it doesn't show a 'variom`etre'?
Forum: Tech Log
30th Jul 2011, 19:23
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Selected V/S

I'm puzzled by something. I would like to know what significance it has and would welcome any comments: -

Page 114 (Annexe 4 - Paramètres longitudinaux):
The "Vitesse verticale selectée" starts...
Forum: Tech Log
29th Jul 2011, 15:15
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

From the BEA press release: To achieve a rate of...

From the BEA press release: To achieve a rate of climb of 7000 ft/min, then reduce it to 700 ft/min in the time allocated in BEA's note, requires a level of "gee" that brought the AoA very close to...
Forum: Tech Log
29th Jul 2011, 12:57
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Of course you need to have valid airspeed to set...

Of course you need to have valid airspeed to set the green/red correctly.
Forum: Tech Log
25th Jul 2011, 23:36
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Your first sentence reminds me of D.P.Davies: "If...

Your first sentence reminds me of D.P.Davies: "If you can choose between stalling and something else, choose something else" (IIRC). IMHO your second sentence needs to be qualified: At M.82 the...
Forum: Tech Log
25th Jul 2011, 23:02
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

You'd be disappointed. The point is - if the wind...

You'd be disappointed. The point is - if the wind speed is horizontal and constant in magnitude and direction, there is absolutely no effect on the airplane, except that the center of the circles...
Forum: Tech Log
25th Jul 2011, 14:04
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Going round in circles

As a student I piloted gliders. These routinely fly tight circles to stay in thermals. In a strong wind there is no airspeed loss turning downwind, nor gain turning upwind. I've never quite figured...
Forum: Tech Log
23rd Jul 2011, 16:14
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Is this your reference? - BEA Interim #2,...

Is this your reference? -
BEA Interim #2, 1.16.3 Study of losses of or temporary anomalies in indicated speeds:
Forum: Tech Log
17th Jul 2011, 23:14
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

According to the AAIB report there was indeed a...

According to the AAIB report there was indeed a short overspeed condition but overspeed protection was never active. The zoom climb was due to the AoA exceeding alpha-prot due to turbulence, and the...
Forum: Tech Log
16th Jul 2011, 11:15
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Gums' point is illustrated in this graph:...

Gums' point is illustrated in this graph: cLalphaM06.gif (https://docs.google.com/leaf?id=0B0CqniOzW0rjMTVlZGNiMDEtYzA3NC00MTkwLWI1ODEtZWZlODExMDk2NzBm&hl=en_GB)

It should be noted that only the...
Forum: Tech Log
15th Jul 2011, 22:34
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Hi takata, Thank you again for your patience...

Hi takata,

Thank you again for your patience with me. I'm quite happy to let the matter rest, simply because the available documentation apparently doesn't provide the answers we are looking for....
Forum: Tech Log
15th Jul 2011, 22:06
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Sorry takata, I am unclear which 'last...

Sorry takata,

I am unclear which 'last sentence' you are referring to. I quoted from the section on "High Angle of Attack Protection", which ends with "Pour terminer, ... givrage des sondes...
Forum: Tech Log
15th Jul 2011, 21:08
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

I did. We're not discussing any protection, but...

I did. We're not discussing any protection, but the indication of Vsw on the PFD. But thanks anyway.
Forum: Tech Log
15th Jul 2011, 17:10
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

takata, Hmmm, may be the AB engineers cited in...

takata,
Hmmm, may be the AB engineers cited in the ACA memo don't understand their aircraft, but they say explicitly on page 6: "Sur les PFD les vitesses VaPROT et VaMAX sont remplacés par Vsw".
Forum: Tech Log
15th Jul 2011, 12:23
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Stall always involves the boundary layer. It...

Stall always involves the boundary layer. It wouldn't occur in friction-less flow, but there wouldn't be any lift either. To comment on the Mach involved - I noted a while back that alpha-max is...
Forum: Tech Log
14th Jul 2011, 22:35
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

takata; I think I basically agree with what...

takata;

I think I basically agree with what you wrote. I just wasn't aware of it and thanks for patiently clarifying this point. However, I'm left with a few grey areas which may be relevant for...
Forum: Tech Log
14th Jul 2011, 20:26
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Thanks Takata, can you please provide a...

Thanks Takata,

can you please provide a reference?
Forum: Tech Log
14th Jul 2011, 20:05
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Maybe I'm misreading that sentence, or else I...

Maybe I'm misreading that sentence, or else I would like to clarify that Vsw is shown on the PFD in Alternate Law, it is not shown in Normal Law. Perhaps it's just a typo, and the intended speed is...
Forum: Tech Log
14th Jul 2011, 10:40
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

RetiredF4; Please have a look at Figure6...

RetiredF4;

Please have a look at Figure6 (http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20050214373_2005208658.pdf), originally linked by
zumBeispiel...
Forum: Tech Log
13th Jul 2011, 21:35
Replies: 1,998
Views: 509,540
Posted By HazelNuts39

Thx Henra, I wasn't aware of that. In the case of...

Thx Henra, I wasn't aware of that. In the case of AF447, when the pilot 'maintained nose-up inputs' after 2:10:51, and continued that '15 seconds later', reaching a pitch attitude of 16 degrees, and...
Showing results 1 to 35 of 48
 
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