Importance of correct use of
manual tilt in order to detect and
avoid significant areas of ice
crystals
On
3 February 2013, a crew in the cruise in equatorial
latitudes at FL340 in IMC
failed to use their weather
radar properly and entered an area of ice crystal
icing
outside the prevailing icing envelope. A short period of
unreliable
airspeed indications on displays dependent
on the left side pitot probes
followed with a brief
excursion above FL340 and reversion to Alternate
Law.
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