Hi,
This forum is titled "Tech Log" as it is normal that all the technical assumptions are discussed here. Many hypothesis have been advanced .. so that even someone qualified can be confused by their number and diversity. There's just a fact that caused all these technical discussions .. it's the pilot performance in the first seconds after the autopilot go off This in my opinion is the most important fact Does this fact is explained by all the technical assumptions in posts? I doubt it strongly. As I said earlier - the BEA can be said to have handled a single AF/Airbus incident "badly", though personally speaking I wouldn't have wanted any part in that political minefield. That incident was 23 years ago and they're still dealing with the damage that did their reputation today. It would be utter madness for them to try to do so again, so I say again, give them a chance. They have this chance .. but they already begin to ruin it by the release of their last note. And this chance was again badly wounded by the statement of a member of the french political body (Mr Mariani directly involved in the following of AF447 cause his position in the government) |
Originally Posted by wallybird7
(Post 6521843)
Just for the record, the mission of EVERY investigating body, is to gather the facts and make a determination of Probable Cause and to recommend a fix, but NOT to affix blame, fault, or liability, which is left to legal venues.
However, I don't see anywhere in the post you quoted where I referred to "blame". I was very careful in the word I chose, and said "finding", using the language common to the AAIB, NTSB et al. As a pilot all I want is all the given facts and then I can make my own conclusion regarding what to do about it. In this case avoid thunderstorms at all costs. Period. Seriously though, when they've got facts worthy of release - I suspect they'll release them. It has long been common practice in aviation accident investigation to cover as much ground as they can so that as much can be learned as possible - that's the reason it tends to take a while. For example, the AAIB's final report on the BA038 incident took 2 years and one month to produce. In that case, they had the entire airframe more-or-less intact, both flight recorders and the QAR to hand, as well as the entire crew and passenger list available for interview - but the lack of evidence regarding icing on the heat exchangers meant that there was a significant hole in the available data and thus there was a seemingly "inexplicable" element to the incident. The BEA produced their initial interim report on AF447 with small fragments of wreckage, a set of ACARS messages and no flight recorder data. Now that they have more wreckage and the flight recorders they are probably going to have to do a lot of rewriting of their assumptions, as well as a whole battery of human factors testing in relation to what they've learned from the CVR. As an aside, the discussion on BA038 on here went back and forth for those entire two years, and speaking for myself I learned a lot of new and surprising things from that discussion - but at no point did any contributor demand that the raw data traces were released or chide the AAIB for not doing so. Now was that because it was the AAIB doing the investigation and not the BEA? Was it because the aircraft involved was a Boeing 777 and not a member of the Airbus FBW family? Or was it because there's an understanding that these things take time and should not be rushed. Being on here for as long as I have, I suspect it was a combination of all three. Finally, there were theories doing the rounds (that ended up in the BBC/NOVA "Lost" documentary on AF447 back in 2009) that the thunderstorm cells were obscured on radar by a smaller cell in front of the cell they entered - what do you do in that situation if avoidance beomes impossible? when in fact they won’t even allow pilots to practise “hand flying” in the simulator at altitude, let alone in the airplane.
Originally Posted by jcjeant
(Post 6521877)
Just a tought
They have this chance .. but they already begin to ruined it by the release of their last note. And this chance was again badly wounded by the statement of a member of the french political body (Mr Mariani directly involved in the following of AF447 cause his position in the government) The problem is that there are some on here that remain wedded to the idea that the BEA will always try to find against the pilot before anything else - something that is not supported by any evidence gathered over the last 20 years at least. Yes, their paycheques are ultimately signed by an entity that has a controlling stake in the manufacturer and airline involved, but the same was true to some degree of the old UK AIB (in the days when the UK made airframes and BA was state-owned), as well as the NTSB prior to the mid '70s (Boeing/McD-Douglas and Lockheed were privately owned, but heavily dependent on government/military contracts). |
Finally, there were theories doing the rounds (that ended up in the BBC/NOVA "Lost" documentary on AF447 back in 2009) that the thunderstorm cells were obscured on radar by a smaller cell in front of the cell they entered - what do you do in that situation if avoidance beomes impossible? Regards |
Deficient Documentary
Dozy:
Finally, there were theories doing the rounds (that ended up in the BBC/NOVA "Lost" documentary on AF447 back in 2009) that the thunderstorm cells were obscured on radar by a smaller cell in front of the cell they entered - what do you do in that situation if avoidance beomes impossible? |
Hi,
"Badly wounded" how? They released all the information they could determine after just a few days looking at the data The note released it's just some fragments of the CVR record. Unless the CVR had recording problems ... we can't tell the BEA released all the information provided by the CVR This is why all those posts trying to fill the gaps open by this incomplete release. If I quote one of your message incompletely .. you will complain of context .. ♫♪la la la♪♫ Same for a incomplete BEA release .... |
A half truth is a whole lie (yiddish proverb)
Hi,
They had time to carefully select and release the "right information" taking into account all all possible implications. Trying to secure a big and comfortable "room to maneuver". From 2 h 10 min 05 , the autopilot then auto-thrust disengaged and the PF said "I have the controls". The airplane began to roll to the right and the PF made a left nose-up input....The airplane’s pitch attitude increased progressively beyond 10 degrees and the plane started to climb....The PF made nose-down control inputs and alternately left and right roll inputs.The vertical speed, which had reached 7,000 ft/min, dropped to 700 ft/min and the roll varied between 12 degrees right and 10 degrees left. At 2 h 10 min 51, the stall warning was triggered again. The thrust levers were positioned in the TO/GA detent and the PF maintained nose-up inputs...The PF continued to make nose-up inputs. The airplane’s altitude reached its maximum of about 38,000 ft, its pitch attitude and angle of attack being 16 degrees...The PF made an input on the sidestick to the left and nose-up stops, which lasted about 30 seconds..." And in emphasizing persistent NU commands seems as to considering as the "major cause", coherent to LF leak, deviating the focus from plane malfunction(s). This was IMO a tentative to gradually prepare public opinion and timely to the big "interests involved in Paris Air Show". The seriousness because the LF leak was too early (IIRC in the Monday subsequent the first analysis during the weekend). Probably an opportunistic attitude from one(s) representing the huge interests" behind. With risk (and probably, intentions) in creating a "frame" for BEA "output". Human machine interface issues, "software issues", etc. would be considered "machine faults"? System processing of "ridiculous Pitot redundancy" has chances to be considered "machine fault"? All this are "against crew" and makes easier the work of the "high rocks" at FR government and it´s personnel (including BEA top managers). Most of us yet now could imagine the Report and it´s recommendations. Certainly BEA is "ahead of the schedule" on that. They seems to be navigating very well in this turbulent weeks since wreckage location. |
Originally Posted by Graybeard
(Post 6521936)
I just want to repeat that documentary was rubbish. Just reading the pilot's guide for the Wx radar on 447 would have given them real info about the radar capabilities. Instead, they went off on an ill-founded theory about the "storm behind the storm."
Originally Posted by jcjeant
(Post 6521961)
I disagree about this
The note released it's just some fragments of the CVR record. Unless the CVR had recording problems ... we can't tell the BEA released all the information provided by the CVR This is why all those posts trying to fill the gaps open by this incomplete release. If I quote one of your message incompletely .. you will complain of context .. ♫♪la la la♪♫ Same for a incomplete BEA release .... Case in point - I remember an accident described in the "Black Box" book* that accompanied the C4 series of the same name in 1996. The investigators in that case released CVR data where the pilots were complaining of being tired - this got picked up by the press and the accident was written up as fatigue-induced pilot error. Another angle they were working at the time was that the altimeter fitted to the aircraft in question was known to occasionally misread by up to 1,000 ft and there was plenty of evidence that this had indeed happened. As such, they recommended replacing that model of altimeter, but because public perception had already accepted the "fatigue" explanation, the regulator wasn't interested. This is about the fifth time I've asked this question and I've yet to get an answer - why are there demands for raw data being made of the BEA in this instance from some quarters on this forum, when to my memory no such demands have ever been made of the NTSB or AAIB? @RR_NDB : I note that when journalistic "tittle-tattle", as it applies to piloting and aircraft operations, is brought up on here it tends to be treated with the scorn it deserves, except in very exceptional circumstances. Why should press hearsay about the motivations of the BEA and the French government be any different? [EDIT : Just had a quick squiz on Google, and as far as I can see the "Paris Air Show" connection was made at the end of a paragraph in a Flight International article, and all that said was that the timing of the discovery "could have come out of a film script" - no connection to the possible release of information to protect Airbus or Air France has been made outside of the speculation on this forum.] * - The book was heavily oversimplified and wasn't really all that - but my local Waterstone's was getting rid of it for 2 quid... |
Re: A Half Truth
RR_NDB
Perhaps a more appropriate saying: Do not be desirous of having things done quickly. Do not look at small advantages. Desire to have things done quickly prevents their being done thoroughly. Looking at small advantages prevents great affairs from being accomplished. |
This was actually predated by the noted Far Eastern scholar, Wo Phuc, who noted:
"If you want it badly, you'll get it badly." |
Invisible Thunderstorms
Dozy:
What do you do about the thunderstorm you can't see? Was it that the AF pilots didn't receive adequate training in use of their Wx radar? Was it that AF didn't upgrade to the latest radar that has special processing for tropical storms? Do you believe there are thunderstorms with no rainfall or ice pellets? |
@Graybeard : The context of my question is that if enough people thought it was a possibility, even if it doesn't turn out to have much of a bearing on the case, would it not be a good idea to look into remedying the situation - whether that be via training or technology?
I've got no answers to your other questions, other than a nagging suspicion that for all our knowledge, nature will always find a way of surprising us - sometimes not in a good way. |
Thanks OK465,
That is the message, very concise. :ok: |
Originally Posted by DozyWannabe
The BEA were the ones who released that information publicly when their initial interim report was released a couple of years back - if they really wanted to "stitch up" the pilots then they would never have released that information.
Originally Posted by RR NDB
Probably an opportunistic attitude from one(s) representing the huge interests" behind. With risk (and probably, intentions) in creating a "frame" for BEA "output".
http://i25.servimg.com/u/f25/11/75/17/84/af447_10.jpg Three lies in one single image :
|
Originally Posted by CONF iture
(Post 6522305)
Did they have any choice really when ACARS + Air Caraibes report were all over the Net … FIRST.
Three lies in one single image :
Let me know what you think of the stuff I PM'ed you! |
Harry Hawker to his designers
To RR_NDB's (post 4/150), should be added Harry Hawker's suggestion to his designers:
"Simplify, and add lightness." ( I'll try to remember that, if I post again :~? ) |
Three lies in one single image :
|
I will repeat my opinion that the release by BEA was 'mischievous'. As I have said, they have the CVR and FDR. By limiting the CVR info they neatly 'imply' that PF pitched to 10 deg, and climbed 3000' (above optimum and possibly above max) without a single word being said by either pilot about it. Either that is the case, which I positively doubt, or there is some reason why this part of the conversation has not been released. It would have saved pages of PPRune. Without it we are all guessing in the dark
|
Hi BOAC,
I will repeat my opinion that the release by BEA was 'mischievous'. Something similar happened with the B777 at LHR 2008 pprune discussions. It's not the BEA who are mischievous - it's us - the pprune posters. http://www.pprune.org/rumours-news/3...crash-lhr.html |
Originally Posted by BOAC
I will repeat my opinion that the release by BEA was 'mischievous'
As a minor detail, BEA said : "The airplane's pitch attitude increased progressively beyond 10 degrees ..." (to 13 degrees according to my 'simulation'). |
Originally Posted by BOAC
(Post 6522558)
I will repeat my opinion that the release by BEA was 'mischievous'
|
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