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Old 3rd May 2008, 19:44
  #993 (permalink)  
Oluf Husted
 
Join Date: Aug 2007
Location: DK 4200 Slagelse
Age: 82
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BA38s engines "Hesitated"

Dear beseiker, (Bernd)

Flight time from TOD to 780 ft. (incl. one holding) is app. 30 min, but the metal in the very front-end of the core engine was 10 degrees lower (due to the pressure drop) than the outside temp (minus 66 to +0 C.) during descent.
So if the engine anti-ice system is not "on" or not effective at flight idle, the cloud water content clings to stator and rotor-blades, even better/worse, than when on ground in freezing fog.

My theory then is, that BA38 had just enough ice to destroy the aerodynamics and hesitate, but not to shred and damage the blades, that ice would long be gone before the AAIB ever came around.

Oluf Husted (only PPRuNer by name)?
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