Icing tape - lessons learned.

On 2007-02-07, BDS wrote:
I didn't listen to the tape but the descriptions that mentioned a sudden out
of control dive sure sound like a tailplane stall to me. It can take a
tremendous amount of force on the yoke to recover, and recovery technique is
not intuitive because it is not the same as the technique(s) used for a
normal wing stall.

Other nasty things can happen in icing too. You may remember the
incident with the ATR in Roselawn, Indiana (which has a substantially
similar airfoil to a Caravan, I'd imagine). Ice built up behind the
area behind the deicing boots in a ridge. The aircraft was on autopilot.
When the autopilot disconnected, the ailerons underwent a "hinge moment
reversal" - so instead of wanting to remain neutral, snapped to full
control deflection very suddenly. The plane went inverted, and the crew
split-S'd out of it. Unfortunately, the aircraft disintegrated during
the split S from the G forces.

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"Peter R." wrote in message
...
On 2/6/2007 6:28:30 PM, "Capt. Geoffrey Thorpe" wrote:
In regards to the pilot of the Caravan, her brain was already
oversaturated
by the crisis of the aircraft stalling and falling. It is understandable
to
me that her brain did not register that perhaps the pitot heat was not on
or
had failed. I had the luxury of only having to deal with that one problem;
the Caravan pilot had a much bigger problem on her hands.

I'm not convinced anything at all happened, except she got disoriented
trying to make sense of her failed instruments, and then "recovered" from
stable, level flight into a diving, screaming series of over reactions and
recoveries. (Ask me how I know. And then tell me how is it you were spared
this particular learning experience.