Has to be overnight I would say. Wind driven, cold, wet air would do it. Wouldn't need to be snowing per se, but it would help I guess. Time to get out the windscreen scraper.
Definitely caused by either a night stop in BOS (possibly due WX?), or by a long layover during the day.
It certainly wouldn't happen in flight. The flightdeck windows are electrically heated to eliminate condensation and ice buildup.
Also, at 35000 feet, the air outside is so dry that any ice buildup would usually be on the inside - which you may have noticed form on the pax windows in flight.
Ice buildup on the outside of an aircraft in flight usually happens at lower altitudes if the air is humid enough, and when flying in cloud.
Cheers,
Mike
It certainly wouldn't happen in flight. The flightdeck windows are electrically heated to eliminate condensation and ice buildup.
Also, at 35000 feet, the air outside is so dry that any ice buildup would usually be on the inside - which you may have noticed form on the pax windows in flight.
Ice buildup on the outside of an aircraft in flight usually happens at lower altitudes if the air is humid enough, and when flying in cloud.
Cheers,
Mike
Cant comment on this particular flight but if it was at Boston then must have ahd an extended ground time for one reason or other.Even on the ground the windscreens are normally heated. Obviously all this snow and ice would be removed before flight, usually by use of a hot de-ice fluid. Sometimes seen being done just before a flight mainly on the wings though.
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