Rosaviatsia updates Dec. 9 -
- aircraft suffered ADR #1, #2, #3 faults after takeoff, resulting in large excursions in roll and pitch
- aircraft was deiced in two stages. Type I fluid, then type IV. Fuselage was
NOT deiced, only airfoils.
- Suggestion that snow on fuselage, in particular cockpit windows, melted once window heat was turned on. This continued during taxiing.
The runoff then froze again lower on the nose, disrupting airflow to the pitot tubes.
Incident: S7 A21N at Magadan on Dec 2nd 2021, unreliable airspeed