..many thanks for the reply on a subject very dear to my heart!
As a regular Motorcyclist, and owner of vintage Motor Cars, I am well aware of experiencing Carburettor Icing under certain atmospheric conditions, cold, damp weather.
On my Motor cars the effect was to freeze and shrink the aluminium bodies of my SU Carburettors, thereby jamming the close-fitting suction pistons in the chambers, and causing a serious unbalance in the Air/Petrol mixture passed into the engine.
On my Motorcycles the effect was to create ice build-up in the carburettor air intakes, especially at low throttle/high vacuum settings, restricting the air flow, exactly the same as normally aspirated aircraft Carburettors.
It may seem strange, but even in my Flight Simulators, I automatically apply Carburettor Heat when reducing throttle settings prior to landing, and be ready to immediately cancel the setting to obtain maximum power if an abandoned landing and go-around is required,
The effects of Carburettor Icing age are so deadly that it comes as second nature to me now...even though it is not recognised by the Flight Simulators!
And a regular application of Carburettor Heat during the cruise to check for any possibility of ice build-up.
Its reason for the (fatal) crash cannot be ascertained because the ice will have melted by the time the aircraft is inspected!
Many of the amazing Screen shots here, showing small aircraft with normally aspirated engines, appearing in what appears to be very unsuitable weather conditions, unfit for safe flying!
If flying conditions are not suitable for a safe flight, then stay on the ground...(and abandon the screen shot)....trust me!...
Keep a wary eye on those clouds up there...(and watch out for icing/blockage in the Pitot Tube and Static Port affecting your instruments!).
Paul...A Wise Weather Watcher....
P.S...I hate cold, damp weather.!....
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.