The point is: Why were the Flaps retracted with an active stick shaker, contrary to the "STALL RECOVERY" NNC ?
Because they looked out of the window and could see they were clearly not
in a stall situation?
How does looking out the window tell you that you aren't near stall? That sounds like the US Congress testimony that says looking out the window will tell you the AoA.
It might sound like that, but maybe you have forgotten that the stick shaker was active immediately following take-off. Looking out of the window whilst so close to the runway would give you some idea of your progress. Whereas when flying along at 4,000' AGL or higher, I agree you will have fewer clues.
Apart from the stick shaker, what indications of an approaching stall did they have?
In many situations, stick shaker will be the primary indication you're near stall. A 737 is not a Cessna.
Just the stick shaker? However did pilots manage before it's invention (1963) and widespread use (1980's?) Fortunately Morrisond is here now to discuss the finer points of how the 737 stalls. I'm hungry; buffet anyone?
Besides, even a false stick shaker tells you something is wrong with the airplane. The crew cannot continue to operate the airplane as if all is normal.
Great analysis! But which of the many many checklists do you apply. I'm not aware of one called "False stick shaker".
On the other hand, I can visualize plenty of crews who would continue their flight "as if all is normal" whilst troubleshooting minor problems. Isn't that why they have hotlines to their maintenance departments? Prior to these crashes, a false
stick shaker was probably defined as a minor problem. I suspect that is going to change from now on.
Hindsight is a such a beautiful thing.
No hindsight needed, just applying the appropriate NNC's for the cues the airplane is giving you.
No need to be so vague - just state exactly what the stall recovery NNC says. You came up with an imgur link but for some reason I like to see the actual words here on a.net
But if that's a problem. allow me to "initiate the recovery";
Boeing 737 FCOM Stall Recovery MAN.1.1 wrote:
1) Smoothly apply nose down elevator to reduce AoA until buffet or stick shaker stops.
There are further instructions as part of this procedure, but before considering them, I've got to ask; what is the procedure if the stick shaker doesn't stop?
I'm guessing you don't keep "smoothly applying the elevator" until the brown stuff meets the windscreen?
The problem seems to be that the NNC is treating it as if it was a stall situation, in which case it would be cured. Except it isn't.
Unfortunately nothing else on the list comes close to dealing with a stubbornly continuous stick shaker, and neither does this NNC specify which NNC to try next.
Presumably, without resorting to hindsight whatsoever, you have the answer to this too.
Is it by any chance execute a 180 and land a.s.a.p. to allow maint to sort the unknown problem?
You are the professional; I'm just here to learn.
Nothing to see here; move along please.