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Importance of correct use of manual tilt in order to detect and avoid significant areas of ice crystals

25 Jul 2016
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.
Source Skybrary

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