16/09/2024
A preliminary report has been published regarding the ATR plane accident in S America.
It seems that the pilots failed to use the de-icing equipment correctly.
Modern aircraft have very efficient wings. Formula 1 enthusiasts will be aware of the advantages of streamlined structures. A matter of a millimetre or two in ‘shape’ can make an enormous difference in performance.
When an aircraft encounters icing conditions, that is to say moist air and temperatures below 0 deg C, ice builds up on the front of the wing and tail plane.
The presence of ice seriously affects the efficiency of the wings.
There are different methods of removing ice, for example hot air from the engines can be directed along the vulnerable areas to melt it.
On the ATR aircraft, rubber strips inflate and deflate to break up and remove ice.
(Imagine trying to remove dry mud from bicycle tyres. If the mud gathered when the tyres are deflated just pumping up the tyres will break off the dry mud.)
It appears that this crew failed to respond to the ice warnings that tell the pilots when ice is present and to operate the de-icing system.
As a result the aerodynamics of the wing were upset to the extent that the wings could not support the plane.
Warning: Google is good for directions and restaurant opening times. It is an UNRELIABLE source of information for aviation and medical conditions.
Keith
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