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-   -   Stick shacker test making bad muscle memory? (https://www.airlinepilotforums.com/regional/40070-stick-shacker-test-making-bad-muscle-memory.html)

RichieAshburn 05-15-2009 05:21 PM


Originally Posted by Killer51883 (Post 611509)
there is no reason to ever have a stick shaker unless your in the sim. every one knows how slow you need to be going to even get close to a shaker. From every transport category airplane i have flown if your slower than 200-180 kt range your aoa is starting to get uncomfortably high and that is an OBVIOUS clue to start adding flaps or putting in power.


Not a very accurate statement. I've had 3 stick shakers go off. All 3 were on t/o in very gusty/convective conditions. Two times I was the PF, once the PM. One was in the CRJ700 and 2x's in the DC-9. ALL THREE TIMES we were above our Vfto speeds. A sudden gust, the AOA indicator moves, the shaker goes off.

Now granted, we were no where close to a stalled condition, it was a momentary gust. But in all 3 instances the PF had a natural reaction to reduced the AOA slightly to stop the shaker.

My main point...the INITIAL(and natural) REACTION to the shaker was to REDUCE THE AOA.

In YOUR statement, it seems YOU'RE only considering a shaker condition in an approach/landing situation. I am more concerned with the reaction to the situation.

The Juice 05-15-2009 08:23 PM

Any of you guys ever experience severe wind shear? The correct procedure for that is to firewall and ride the stick shaker out of it. That involves a pulling back on the yoke to get the shaker....

just a thought

ExperimentalAB 05-15-2009 10:09 PM


Originally Posted by The Juice (Post 611724)
Any of you guys ever experience severe wind shear? The correct procedure for that is to firewall and ride the stick shaker out of it. That involves a pulling back on the yoke to get the shaker....

just a thought

True...but in that case you are intentionally trying to keep it as close to stall AOA as possible. Probably the only time I'd want to be that close...

rickair7777 05-16-2009 05:38 AM


Originally Posted by 250 or point 65 (Post 611499)
I'm sorry, but that is ridiculous. There is no way that this task should in any way negate the automatic response to an imminent stall. Pushing is in our nature.

We are so ingrained to push that many in my class, including myself, found it very difficult to hold the aircraft in the shaker and let the engines take care of the airspeed during a stall recovery in the ERJ.

Stall recovery is one of the most automatic procedures in all of flying.

Between regular reinforcement to pull back during recurrent sim and regular pusher override tests, I think we could easily develop a spring-loaded response to do the wrong thing here.

I agree that a pilot SHOULD respond to a stall with nose-down inputs, but I suspect that in this case stall and pusher have become separate events as far as muscle-memory goes.

I suspect that for many of us, stall is something that happens in a 172.

You might need to make a conscious decision to override your natural shaker/pusher instinct and go into true stall recovery techniques.

250 or point 65 05-16-2009 05:48 AM

i understand the idea, but I still just find it hard to believe. of course, theres no way for me to prove it.

StillLearning 05-16-2009 07:28 AM

KISS - Keep It Simple Stupid
 
I think we are making a simple situation more complicated with discussions of muscle memory and what we think we were trained to do in the event of stick shaker.

Stick Shaker = Slow Flight

Recovery is increasing the power and maintaining the pitch while the airplane accelerates. As lift overcomes weight/drag, you'll have to push forward on the controls and/or trim nose down to maintain level flight.

Don't pull back and increase the pitch. You'll end up in a pilot induced pitch oscillation that at the upper pitch attitude will engage the stick pusher.

Stick Pusher = Imminent Aerodynamic Stall

The airplane is automatically doing what pilots would do in successful recoveries of imminent or full aerodynamic stalls.

It's not rocket surgery;)

FlyJSH 05-16-2009 07:46 AM


Originally Posted by 250 or point 65 (Post 611829)
i understand the idea, but I still just find it hard to believe. of course, theres no way for me to prove it.

There is no way to prove either side of this question. I was just asking for opinions, as "ridiculous" as that may be.

fit29 05-16-2009 03:26 PM


Originally Posted by 250 or point 65 (Post 611499)
I'm sorry, but that is ridiculous. There is no way that this task should in any way negate the automatic response to an imminent stall. Pushing is in our nature.

We are so ingrained to push that many in my class, including myself, found it very difficult to hold the aircraft in the shaker and let the engines take care of the airspeed during a stall recovery in the ERJ.

Stall recovery is one of the most automatic procedures in all of flying.

Bingo, when I went to the sim for the 190 coming straight from the right seat of a 152 I had a hard time with the stalls, it went against my second nature.


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