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Old 10th Feb 2005, 16:07
  #43 (permalink)  
valenii
 
Join Date: Aug 2001
Location: London
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En-route stalls / spins

The Cirrus fleet is clocking up hours like no other aircraft type, so its not supprising that the whole of the flight envelope is being explored, probably inadvertantly by pilots that make mistakes.

I know of two en-route stall/spin incidents, resulting from bad weather at high altitude.

One was over heavy convective weather in California. One was over the rocky mountains at night.

In both cases I think the aircraft was flying very high on autopilot and caught in severe downdrafts/mountain waves.

An AP in altitude hold will pitch up when experiencing negative VSI, which at high altitude can cause an aircraft to stall at normal cruise power settings. Torque/Fuel Imbalance/Turbulance/Pilot Panic etc can then make things worse.

In both these cases the pilots pulled the Chute and walked away. The Mountain incident was two adults and two children saved, the california incident was a CFII and his wife.

If they had been in a traditional aircraft design, the AAIB would still be trying to work out what went wrong, and their families would be greaving.

Ian

BTW you can recover from a spin in a Cirrus, but its slightly unconventional, like a chipmunk! However it has not been proved that all spins are recoverable, without pulling the chute (which was tested in an inverted spin)
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