PPRuNe Forums - View Single Post - AF 447 Thread No. 6
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Old 19th September 2011 | 20:24
  #936 (permalink)  
GarageYears
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Joined: Jun 2009
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From: VA, USA
Lyman... exasperated!

Are you at all interested in what PNF meant: "What was that?" How about PF: "I think we have some crazy speed".....

You are satisfied with the presumption that the THS stayed where it was due lack of loiter at NU with the Stick?

As a sound professional whose goal is to challenge and improve the industry, you seem easily satisfied.
Hi Lyman, well I thought we had said our goodbyes, but here you are....

As a sound professional I am constrained by the limits of the data presented to me. I cannot analyze what I do not have recorded, I cannot simulate that which I cannot hear, etc. In other words, beyond a certain point I am making !!!!! up. I try to avoid that.

I appreciate the comments you mention might be sound related, but don't I have enough information to definitively state what is or isn't going on? I think not. Can I hazard a guess?

Perhaps...

PNF: "What was that?" --- no, here I can't. Having heard the stall warning from the FWC, it is hard to imagine this being misunderstood, if that is your implication. The Cricket_Stall warning is a unique dual-tone that is interrupted by the spoken word "Stall" repeated every second, so you get something like, "de-da-de-da-STALL-de-da-de-da-STALL...etc". It's alarming and clear. Anyone that ignored that is pretty focused! Did the PNF hear something else? See something else?


PNF: "I think we have some crazy speed" --- yes, my guess is something like this > Once in the stall, the vertical speed would have introduced an unusual and unfamiliar wind-rush sound. Given the AoA, this sound would have had an unusual direction and I suspect character. Perhaps this was mistaken for overspeed. A stall-induced, vertical speed sound is NOT simulated in any flight simulator I have ever been inside.

As for where the THS stayed. Surely we have discussed the behavior? You hold NU for long enough and the THS trims NU, hold ND for long enough and THS trims down. What else do you need to be told?

Last edited by GarageYears; 19th September 2011 at 21:13.
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