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The mysterious crash with the A320

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EHM-1749 Hector:
Hi,
maybe this could explain what happens in these situations:
http://www.pprune.org/forums/archive/index.php/t-218633.html
Hector

EHM-2173 Bastiaan:
I think I'm going to report the crash soon. I think I'll go with Robert that is a mailfunction of the IAS hold system due to a sudden change of wind or perhaps even turbulence. The problem occured before but not on such a massive scale, when my airplane gets kicked so my speed rapidly increases or decreases.

I think it hasn't anything to do with the change of pressure, my experience tells me that those problems only occure above FL340. When te plane started to behave strange it was not likely that it was high enough that a VS of 1200-1500 causes such immens problems. In my 120 hour pilot carreer I never experienced such a thing.

EHM-1883 Matt:
I had exactly the same over Singapore once during an event...in an A380.

EHM-2198 Didimo:
I experienced that problem several time with an A320 from iFDG if left in autopilot it tended to suddenly (at random) go unstable and initiate a horrible dive of nearly 10,000'

With a previous model (also iFDG) I also noticed the a/c going in sinousoidal waves up and down several hundred feet when left in A/P to hold altitude.

Later on I saw on Air Crash Investigation that these are called "Phugoid Cycles" I am not sure if I spelled it correctly but it sounds like "Fu-gooid"

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