Originally Posted by rudderrudderrat
Hi Clandestino,
Quote:
And what bearing on AF447 does it have?
The most important warning on that flight deck was "Stall Stall" - which appears to have been ignored / not acknowledged / not heard. (Similar to the You Tube "What's that Beeping?")
If their human auditory channel was filled to capacity with previous flight deck audio noises, (Cavalry Charge, ECAM Dings, ALT Alert etc), and the crew are attempting to verbally communicate whilst they trouble shoot - what is the point of having the only stall warning alert simply another verbal "Stall Stall"?
Even my iPhone has both audio ring plus Vibrator to get my attention.
Do most other aircraft have a stick shaker as a stall warning? If Apple can fit one into my phone, why was it not possible to fit something similar into the side sticks?
Before AF447 event, there was NO Stall Warning QRH procedure. The previous procedure was buried in FCOM.
The new QRH procedure emphasises reducing angle of attack, and does NOT recommend the use of TOGA power. (as the old FCOM procedure did)
Indeed, a major puzzle why ignore the stall warnings for 3 or 4 minutes? In the entire transcript of the incident not once was "stall" or "décrochage" ever mentioned by any of the 3 pilots.
Reasons
1. Both FOs overloaded for 4 minutes and did not hear it.
2. Both FOs heard it and ignored it as being false (as per recent QF72 etc malfunction.) But why not verbalize that?
3. Both FOs didn't understand it/unfamiliar "<Stall><Stall>. What's that?". Would the french
décrochage or flat line tone been better warning? Were they verbalizing that they did not understand it. Perhaps confused in the heat of the moment. Or did "What's that?" refer to something else.
4. Both FOs heard it and accepted it and did not know what to do. Again why not verbalize that?