French passenger jet gone missing from radar screens........

French passenger jet gone missing from radar screens........

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anonymous-user

56 months

Saturday 28th April 2012
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Mojocvh said:
el stovey said:
MercScot said:
Whatever anyone says, it does seem obvious this was serious pilot error, did they face any more of a challenge than Eric Moody? Somehow I doubt it.

(For those of you who are much younger than me and have no idea who Eric Moody is, Google his name and/or BA flight 9)


Moody's (not that he was even in the flight deck when the engines stopped) situation was much more straight forward. All the crew had to do was descend at a safe speed and keep trying to relight the engines.

The air france crash was a much more confusing situation. They had an aircraft in bad weather with unreliable instruments and stall warning systems telling the pilots conflicting information that couldn't clearly indicate to them whether the aircraft was stalled or not. What's the point in a warning system if THREE pilots can't easily understand what's going on? That's very poor design.
But it did tell them they were stalled. The fact that their SA had broken down so much [or never got there in the first place] that they somehow couldn't recognize their descending altitude is just so unsettling. There will be a number of holes lined up here and by far and above the majority will be for training, lack of system knowledge and poor airmanship.
The warning system certainly told them they were stalled along with all the other conflicting information from other instruments and other warnings going off.

Then when the speed got really low the stall warning stopped as the aircraft thought it was on the ground. The pilots reasonably thought it was now un-stalled. Then when the speed increased, the stall warning started all over again again. As I said before, that's a very very poor design. It's prime purpose is to alert the crew the aircraft has stalled but two, possibly three trained and qualified experienced pilots were unable to understand quickly and clearly what was going on.

I've practiced this event in a simulator and it was horrendous. That's being wide awake during the day and knowing in advance we were going to do it. Add night time some convective weather and it's very nasty indeed.

The pilots certainly made mistakes but It seems odd to me that you appear to be very intent on blaming them. It's not the sort of viewpoint I would expect a casual observer to have enough background knowledge to enable him/her to do. You must be fairly knowledgeable about these aircraft and their operation to be confident in arguing your point. In particular your assertions about Air France's pilots and their training. Do you have (or have ever had) any connection to airbus or EADS?


bitchstewie

52,255 posts

212 months

Saturday 28th April 2012
quotequote all
The more I read about this and other accidents the more I think it comes down to two combinations - aircraft that have more and more technology combined with pilots that perhaps don't actually have that much experience flying using the stick.

I've no experience or knowledge of aircraft beyond documentaries, but it just seems that there is too much going on sometimes to just fly the plane when the st hits the fan.

Mojocvh

16,837 posts

264 months

Saturday 28th April 2012
quotequote all
"the aircraft thought it was on the ground."

False.

The stall warning is [as I am sure you know] inhibited below 60kts. Such a low threshold being deemed as an acceptable parameter as a stall warning is triggered [as I am sure you know] not by airspeed but by angle of attack.

ALawson

7,820 posts

253 months

Saturday 28th April 2012
quotequote all
mybrainhurts said:
That was covered on TV ages ago. Nothing new there.
Didn't see it, sobering none the less, that a pilot can forget the basics.

jbi

12,682 posts

206 months

Saturday 28th April 2012
quotequote all
ALawson said:
mybrainhurts said:
That was covered on TV ages ago. Nothing new there.
Didn't see it, sobering none the less, that a pilot can forget the basics.
it's not about forgetting the basics...

modern commercial pilots are trained to rely on their instruments completely... Flying by instinct is pretty much bred out as a "bad habit"

Mojocvh

16,837 posts

264 months

Saturday 28th April 2012
quotequote all
jbi said:
ALawson said:
mybrainhurts said:
That was covered on TV ages ago. Nothing new there.
Didn't see it, sobering none the less, that a pilot can forget the basics.
it's not about forgetting the basics...

modern commercial pilots are trained to rely on their instruments completely... Flying by instinct is pretty much bred out as a "bad habit"
That's not what the pilots are saying at all, they WANT to fly either by hand or instruments BUT the beancounters and managers won't let them exercise their skills by opting out of the automatics that have been built in by the manufacturers [a&b] on litigate grounds.

At present the industry is in a mess in Europe, North America and some regions of the Pacific Rim. Beyond that you take your life in your own hands!

Murcielago_Boy

1,996 posts

241 months

Monday 30th April 2012
quotequote all
IMO, surely people should be asking "why did the damn pitot tubes fail?" - what a crap system...
If all it takes is some bloody ice (which is ultimately responsible) for one of the worlds most advanced passenger jets coming down then we need to think about that FIRST...Everything (pilot error etc) was a result of THAT failure....?




davepoth

29,395 posts

201 months

Monday 30th April 2012
quotequote all
Murcielago_Boy said:
IMO, surely people should be asking "why did the damn pitot tubes fail?" - what a crap system...
If all it takes is some bloody ice (which is ultimately responsible) for one of the worlds most advanced passenger jets coming down then we need to think about that FIRST...Everything (pilot error etc) was a result of THAT failure....?
That has been rectified as I understand it. Iced pitot tubes do not make a plane fall out of the sky though.

harry010

4,423 posts

189 months

Monday 30th April 2012
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I found this article very interesting

http://www.popularmechanics.com/technology/aviatio...

tonyvid

9,870 posts

245 months

Monday 30th April 2012
quotequote all
harry010 said:
I found this article very interesting

http://www.popularmechanics.com/technology/aviatio...
Ready that makes me feel queasy frown

LukeBird

17,170 posts

211 months

Monday 30th April 2012
quotequote all
tonyvid said:
Ready that makes me feel queasy frown
Me too.
The last few lines of the transcript are chilling.

MitchT

15,979 posts

211 months

Monday 30th April 2012
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Article said:
The two copilots discuss the unusually elevated external temperature, which has prevented them from climbing to their desired altitude...
Can anyone explain to a layman why an unusually high temperature would prevent a plane from climbing?

magpie215

4,458 posts

191 months

Monday 30th April 2012
quotequote all
MitchT said:
Can anyone explain to a layman why an unusually high temperature would prevent a plane from climbing?


Warmer air is less dense = reduced lift from the wings and lower thrust from the engines

fathomfive

9,973 posts

192 months

Tuesday 1st May 2012
quotequote all
LukeBird said:
tonyvid said:
Ready that makes me feel queasy frown
Me too.
The last few lines of the transcript are chilling.
It is very sobering indeed.

anonymous-user

56 months

Tuesday 1st May 2012
quotequote all
davepoth said:
Murcielago_Boy said:
IMO, surely people should be asking "why did the damn pitot tubes fail?" - what a crap system...
If all it takes is some bloody ice (which is ultimately responsible) for one of the worlds most advanced passenger jets coming down then we need to think about that FIRST...Everything (pilot error etc) was a result of THAT failure....?
That has been rectified as I understand it. Iced pitot tubes do not make a plane fall out of the sky though.
Any accident is a combination of a number of factors. All the holes in the cheese line up to end up in a crash.

The 'holes' here are design faults in the airbus warning systems, the weather, the time of day, the pitot tube heat, AF training and probably numerous others. Any one of them if rectified would have stopped that crash. All of them happening at the same time led to a crash.

Certainly if the probes hadn't iced up there wouldn't have been a crash.

croyde

23,201 posts

232 months

Tuesday 1st May 2012
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I was reading that and willing the pilot to stop pulling back on the stick. Awful frown

theboss

6,954 posts

221 months

Tuesday 1st May 2012
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As somebody who has followed the investigation and this thread with great interest, but as a complete layperson with regards to aviation, the one thing that has me really puzzled is the failure to acknowledge the falling altitude. The captain makes an observation at 10,000ft but this doesn't appear to have concerned them greatly. Everyone is saying that they were confused about air speed, angle of attack, etc. and I accept they were completely disorientated, but how did they manage to miss the fact that they were plummeting out of the sky until the very last minute? Apologies to the qualified amongst us if I have misunderstood something obvious. As somebody who already posessed a completely irrational fear of flying I find this accident deeply unsettling.

Steameh

3,155 posts

212 months

Tuesday 1st May 2012
quotequote all
theboss said:
As somebody who has followed the investigation and this thread with great interest, but as a complete layperson with regards to aviation, the one thing that has me really puzzled is the failure to acknowledge the falling altitude. The captain makes an observation at 10,000ft but this doesn't appear to have concerned them greatly. Everyone is saying that they were confused about air speed, angle of attack, etc. and I accept they were completely disorientated, but how did they manage to miss the fact that they were plummeting out of the sky until the very last minute? Apologies to the qualified amongst us if I have misunderstood something obvious. As somebody who already posessed a completely irrational fear of flying I find this accident deeply unsettling.
If they thought the pitots were completely fubar, they could have believed they were getting erroneous altitude indications, similar to that of AeroPeru 603

Tiggsy

10,261 posts

254 months

Tuesday 1st May 2012
quotequote all
Is the question above more like "did the plane not feel like it was crashing" - I wondered what the onboard sensation would be to fall that fast or would they not notice? In my mind all the passengers are stuck to the ceiling like a cartoon lift but i suppose its not like that!

Super Slo Mo

5,368 posts

200 months

Tuesday 1st May 2012
quotequote all
Tiggsy said:
Is the question above more like "did the plane not feel like it was crashing" - I wondered what the onboard sensation would be to fall that fast or would they not notice? In my mind all the passengers are stuck to the ceiling like a cartoon lift but i suppose its not like that!
I would guess that once it's started to drop, it'll at pretty much a uniform speed, so the passengers would not feel the descent, as there's no acceleration (not after the first few seconds anyway)