15 passengers injured QANTAS stick shaker !
- Thread starter Shannow
- Start date
- Status
I am a certified FAA Controller, Air Traffic and Airspace Manager, and Aircraft Accident Investigator.
I'm looking forward to the results of the ATSB's investigation.
Activation of the stick shaker is normally a serious thing.
Good thing they recovered the aircraft into stable flight (normally why it kicks in..)
There was an accident years ago, where the stick shaker activated, and the pilots pulled that yoke right up and
stalled her out..
I'm looking forward to the results of the ATSB's investigation.
Activation of the stick shaker is normally a serious thing.
Good thing they recovered the aircraft into stable flight (normally why it kicks in..)
There was an accident years ago, where the stick shaker activated, and the pilots pulled that yoke right up and
stalled her out..
Last edited:
Originally Posted By: dlundblad
This is why you always stay buckled in when seated even if the fasten seat belt sign is off.
+1, and keep it snug.
This is why you always stay buckled in when seated even if the fasten seat belt sign is off.
+1, and keep it snug.
Not enough in the article to speculate.
The 747 stick shaker activates when AOA vanes on the airplane measure an AOA exceeding a threshold value, which is just before the wing actually stalls. A stick shaker in flight could be from exceeding a near stall AOA, or from a failure in the system. False warnings are exceedingly rare.
The 747 stick shaker activates when AOA vanes on the airplane measure an AOA exceeding a threshold value, which is just before the wing actually stalls. A stick shaker in flight could be from exceeding a near stall AOA, or from a failure in the system. False warnings are exceedingly rare.
Originally Posted By: Timo325
There was an accident years ago, where the stick shaker activated, and the pilots pulled that yoke right up and
stalled her out..
Colgan 3407 in Buffalo. Absolute morons in the cockpit for multiple reasons. There's a "worst" in every job out there.....they were that for certain.
There was an accident years ago, where the stick shaker activated, and the pilots pulled that yoke right up and
stalled her out..
Colgan 3407 in Buffalo. Absolute morons in the cockpit for multiple reasons. There's a "worst" in every job out there.....they were that for certain.
- Joined
- Jul 2, 2007
- Messages
- 5,293
Affordable AOA warning indicators have made it down to single engine piston a/c these days. Highly valuable avionic.
I fly transpacific flights regularly and always have my seat belt on when seated. Last year we hit turbulence out of the blue while over the Aluetians. The plane experienced a 1-2 second drop before recovering. No injuries on that flight but some were floating in the cabin plus a lot of screams just like a fair ride.
You buckle up not only for your safety but for others as well. Who knows where you or who you will land on.
You buckle up not only for your safety but for others as well. Who knows where you or who you will land on.
Yeah. That's the rule. Buckle up when seated. Remain seated and buckled when I've got the sign on.
I say it to the passengers on every flight.
Lots of people ignore those instructions. I don't care that much if they hit the ceiling, I only care a little, but it's hard to care...Ignore my direction? In a metal tube going nearly 600 MPH?
You're an idiot.
Sadly, those people present a risk to their fellow passengers. And that bothers me.
I say it to the passengers on every flight.
Lots of people ignore those instructions. I don't care that much if they hit the ceiling, I only care a little, but it's hard to care...Ignore my direction? In a metal tube going nearly 600 MPH?
You're an idiot.
Sadly, those people present a risk to their fellow passengers. And that bothers me.
Originally Posted By: Pop_Rivit
Originally Posted By: Shannow
So what's the go here ?
Simple-it is impossible to know for certain until the event is investigated.
Thankyou for your as always well considered andtrollfull thoughtful comments.
I was hoping to elicit from those who actually do things (like fly planes) what the protective mechanism was, when they are likely to activate, and what pilots need to do in these events.
The media down here don't understand it, as the inference is that the passengers were injured by the "stick shaker", which I believe is really the incident that LEAD to the stick shaker.
Originally Posted By: Shannow
So what's the go here ?
Simple-it is impossible to know for certain until the event is investigated.
Thankyou for your as always well considered and
I was hoping to elicit from those who actually do things (like fly planes) what the protective mechanism was, when they are likely to activate, and what pilots need to do in these events.
The media down here don't understand it, as the inference is that the passengers were injured by the "stick shaker", which I believe is really the incident that LEAD to the stick shaker.
Originally Posted By: Astro14
The 747 stick shaker activates when AOA vanes on the airplane measure an AOA exceeding a threshold value, which is just before the wing actually stalls. A stick shaker in flight could be from exceeding a near stall AOA, or from a failure in the system. False warnings are exceedingly rare.
Ta mate...
The 747 stick shaker activates when AOA vanes on the airplane measure an AOA exceeding a threshold value, which is just before the wing actually stalls. A stick shaker in flight could be from exceeding a near stall AOA, or from a failure in the system. False warnings are exceedingly rare.
Ta mate...
Originally Posted By: OneEyeJack
Originally Posted By: dlundblad
This is why you always stay buckled in when seated even if the fasten seat belt sign is off.
+1, and keep it snug.
I do the same.
Originally Posted By: dlundblad
This is why you always stay buckled in when seated even if the fasten seat belt sign is off.
+1, and keep it snug.
I do the same.
Originally Posted By: Shannow
I was hoping to elicit from those who actually do things (like fly planes) what the protective mechanism was, when they are likely to activate, and what pilots need to do in these events.
The media down here don't understand it, as the inference is that the passengers were injured by the "stick shaker", which I believe is really the incident that LEAD to the stick shaker.
Was thinking the same thing, I don't fly airliners, but I do work in Avionics. As I'm sure you know, the normal function of the stick shaker doesn't change the pitch of the aircraft. There is also a stick pusher, if the shaker doesn't get your attention. Obviously it will attempt to get the nose down. I don't recall if the 747 has a stick pusher. As Astro said either they were in a place they shouldn't have been, or there was a system malfunction, which is interesting. For the later to happen, usually at least two independent systems need to agree to activate.
And yes, if my butt is in the seat, the belt is on.
I was hoping to elicit from those who actually do things (like fly planes) what the protective mechanism was, when they are likely to activate, and what pilots need to do in these events.
The media down here don't understand it, as the inference is that the passengers were injured by the "stick shaker", which I believe is really the incident that LEAD to the stick shaker.
Was thinking the same thing, I don't fly airliners, but I do work in Avionics. As I'm sure you know, the normal function of the stick shaker doesn't change the pitch of the aircraft. There is also a stick pusher, if the shaker doesn't get your attention. Obviously it will attempt to get the nose down. I don't recall if the 747 has a stick pusher. As Astro said either they were in a place they shouldn't have been, or there was a system malfunction, which is interesting. For the later to happen, usually at least two independent systems need to agree to activate.
And yes, if my butt is in the seat, the belt is on.
Last edited:
As has been mentioned, a stick shaker (in this case a "yoke" shaker) goes off when the angle of attack is too high, just preceding a stall. It could be induced by pulling back on the yoke too hard, or more commonly in a big airplane like this, being too slow. The natural and normally correct response if at altitude is to push the yoke forward to lower the angle of attack, and push up the throttles if the airspeed is low. Even if it's a false warning, the pilot is likely to immediately push forward on the yoke to lower angle of attack while he evaluates the situation. If the pilot did this rapidly he could easily have put the aircraft in a zero or negative G condition. At zero G, the unbelted passengers would likely become airborne. The stick shaker didn't injure anybody, zero or negative G on the aircraft as a response to the shaker might have.
http://www.perthnow.com.au/news/western-...98bd7ed02fd2377
Suggested wake turbulence as the aircraft entered a holding pattern before landing in HK.
Suggested wake turbulence as the aircraft entered a holding pattern before landing in HK.
The stick shaker itself is simply a warning mechanism. It's a small motor with an eccentric weight. When the threshold AOA is exceeded, the motor spins and the stick itself vibrates...it's annoying...loud...obvious...and absolutely unmistakeable.
Now, false warnings of low airspeed have happened, like AIr France, with incorrect crew response.
If you shove forward on the yoke, you will unload the airplane, perhaps to negative G...so...that's a possibility...
But, of course, that's hard to tell yet, unless, as unlikely as it might seem, the press has gotten the details wrong where airplanes are concerned...
Edit: missed your link.
Turbulence, caused by jet wash/wake is what they're saying now....that makes more sense...and could cause momentary AOA excursions that activate the stick shaker....
Hmm...facts coming out days after the event? Facts that completely that change the story? In aviation? Nah...that never happens...
Now, false warnings of low airspeed have happened, like AIr France, with incorrect crew response.
If you shove forward on the yoke, you will unload the airplane, perhaps to negative G...so...that's a possibility...
But, of course, that's hard to tell yet, unless, as unlikely as it might seem, the press has gotten the details wrong where airplanes are concerned...
Edit: missed your link.
Turbulence, caused by jet wash/wake is what they're saying now....that makes more sense...and could cause momentary AOA excursions that activate the stick shaker....
Hmm...facts coming out days after the event? Facts that completely that change the story? In aviation? Nah...that never happens...
Last edited:
- Status
