Horizontal Stabilizer (Tail) Stall Warning
10-20-2009, 08:33 PM
#1
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Horizontal Stabilizer (Tail) Stall Warning
Greetings,
Just a thought; If wings can stall, and therefore have stall warning devices on them, why not on the tail?
A tail stall is rare, but quite dangerous, and mixing up a "regular" stall from tail stall is deadly.
I don't want to dig too far into the Colgan loss, but maybe if the aircraft had installed BOTH wing and tail stall warning vanes the crew would have been able to accurately differentiate between the two stalls and apply appropriate stall recovery.
This is an 'easier said than done' issue I realize, BUT---the importance of such a system cannot be overlooked especially for Flight Into Known Ice aircraft.
A tail stall warning device would stack the deck in OUR favor.
With honor and respect for the Colgan passengers AND crew,
block30
Just a thought; If wings can stall, and therefore have stall warning devices on them, why not on the tail?
A tail stall is rare, but quite dangerous, and mixing up a "regular" stall from tail stall is deadly. I don't want to dig too far into the Colgan loss, but maybe if the aircraft had installed BOTH wing and tail stall warning vanes the crew would have been able to accurately differentiate between the two stalls and apply appropriate stall recovery.
This is an 'easier said than done' issue I realize, BUT---the importance of such a system cannot be overlooked especially for Flight Into Known Ice aircraft.
A tail stall warning device would stack the deck in OUR favor.
With honor and respect for the Colgan passengers AND crew,
block30
10-20-2009, 08:43 PM
#2
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Joined APC: Jul 2009
Posts: 55
Greetings,
Just a thought; If wings can stall, and therefore have stall warning devices on them, why not on the tail? A tail stall is rare, but quite dangerous, and mixing up a "regular" stall from tail stall is deadly.
I don't want to dig too far into the Colgan loss, but maybe if the aircraft had installed BOTH wing and tail stall warning vanes the crew would have been able to accurately differentiate between the two stalls and apply appropriate stall recovery.
This is an 'easier said than done' issue I realize, BUT---the importance of such a system cannot be overlooked especially for Flight Into Known Ice aircraft.
A tail stall warning device would stack the deck in OUR favor.
With honor and respect for the Colgan passengers AND crew,
block30
Just a thought; If wings can stall, and therefore have stall warning devices on them, why not on the tail?
A tail stall is rare, but quite dangerous, and mixing up a "regular" stall from tail stall is deadly. I don't want to dig too far into the Colgan loss, but maybe if the aircraft had installed BOTH wing and tail stall warning vanes the crew would have been able to accurately differentiate between the two stalls and apply appropriate stall recovery.
This is an 'easier said than done' issue I realize, BUT---the importance of such a system cannot be overlooked especially for Flight Into Known Ice aircraft.
A tail stall warning device would stack the deck in OUR favor.
With honor and respect for the Colgan passengers AND crew,
block30
10-20-2009, 10:35 PM
#3
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Posts: 317
As for inaccuracies, I can only speculate, but I would assume if they developed the system those inaccuracies would and could be accounted for.
10-21-2009, 06:55 AM
#4
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I don't believe the colgan crew thought about a tail stall, much less tried to recover from one. I'm not sure either of them even knew there was such a thing as a tail stall.
I also don't think they had a tail stall...they just got real slow.
I also don't think they had a tail stall...they just got real slow.
10-21-2009, 07:15 AM
#5
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I just read an article that said the captain had watched NASAs icing video a few months previously. And for anyone who has watched that video, a large segment is dedicated to tail stalls.
I know particularly the video discusses a sign of tail stall is buffet in the controls versus an airframe buffet. Did the pilot confuse the shaker with a control wheel buffet? I don't know. I think he is being written off as an idiot waaaay too easily from our spot here on terra firma.
God bless.
10-21-2009, 07:20 AM
#6
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As far as inaccuracies due to ice; The wing stall warning system needs to be heated correct? Does that stall warning system work well in icing conditions?
I'm sure that is hard to tell because not many people have gotten truly close to stall in real icing conditions!
But I would think the same principle would apply to a tail stall warning device. The warning device should be heated.
Once again easier said than done, but it sure seems like a great cost to benefit ratio if these would be installed.
I'm sure that is hard to tell because not many people have gotten truly close to stall in real icing conditions!
But I would think the same principle would apply to a tail stall warning device. The warning device should be heated.
Once again easier said than done, but it sure seems like a great cost to benefit ratio if these would be installed.
10-21-2009, 02:47 PM
#7
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The evidence does point to a plain old wing stall versus tail stall, but what did the crew think was happening? Most importantly can we prevent other crews from thinking the wrong thing?
I just read an article that said the captain had watched NASAs icing video a few months previously. And for anyone who has watched that video, a large segment is dedicated to tail stalls.
I know particularly the video discusses a sign of tail stall is buffet in the controls versus an airframe buffet. Did the pilot confuse the shaker with a control wheel buffet? I don't know. I think he is being written off as an idiot waaaay too easily from our spot here on terra firma.
God bless.
I just read an article that said the captain had watched NASAs icing video a few months previously. And for anyone who has watched that video, a large segment is dedicated to tail stalls.
I know particularly the video discusses a sign of tail stall is buffet in the controls versus an airframe buffet. Did the pilot confuse the shaker with a control wheel buffet? I don't know. I think he is being written off as an idiot waaaay too easily from our spot here on terra firma.
God bless.
So, the more important question is, how do we get crews to succesfully identify and react appropiately to WING STALLS?
Why are people so stuck on the tail ice problems? It has NOTHING to do with this accident.
This accident was about a complete lack of professionalism in the cockpit, a complete loss of situational awareness, and the pilots incorrecty reacting to an aural and physical warning system that was trying to alert the pilots to the rapid loss of airspeed.
10-21-2009, 05:45 PM
#8
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Playing devil's advocate here;
Let's look at this another way, the crew did everything correctly for a tail stall (possibly minus the full power). Was that just coincidence or did they believe there was a tail stall?
Did the crew mis-diagnose the problem? Obviously. Would a tail stall warning device help others in the future? That is the main point.
Let's look at this another way, the crew did everything correctly for a tail stall (possibly minus the full power). Was that just coincidence or did they believe there was a tail stall?
Did the crew mis-diagnose the problem? Obviously. Would a tail stall warning device help others in the future? That is the main point.
10-21-2009, 07:06 PM
#9
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I don't think they diagnosed anything at all. If the CA concluded he had a tail stall, which is a very unusual aerodynamic condition, he would have told the FO so that she would know why he was doing all the wrong things relative to their training.
It might help somebody in the future, but it will not be mandated without a new smoking hull accident which can be attributed directly to tail stall. I don't think colgan is going to qualify.
10-21-2009, 07:54 PM
#10
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That's too bad. Further, there is likely no company who will pony up the money to take the initiative in this realm. A tail stall warning system *seems* like a fairly simple risk management tool that could clear up confusion at a very critical time. At least in my mind the system would.
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