Buonasera Pietro!
The Mi-8/17 are twin-engine helicopters (I suppose three if you include the APU!
).
You are correct, the crew have blanked-off the main engine air intakes "B" (above and to the rear of the cockpit roof), the APU air intake "A" (abaft and central to the aforementioned engine air intakes) and the engine exhaust ports "C" which, on the Mi-8/17, are just for'ard of the main rotor mast/gearbox.
In the illustration below, the engine air intakes "B" are covered with the 'mushroom' style inlet covers which are also heated and perform a basic de-icing function but, as can be seen, the accident aircraft is not fitted with these.
