With reference to the influence of icing on the aircrafts performance it is true that

1. ✓Even minor pollution such as "sandpaper" surface of the carrier may have a dangerous effect on performanceCorrect answer
2. For aircraft icing appeared to affect the performance he must move in the clouds
3. Ice on the upper surface of the wing / rotor blades is less dangerous than the bottom
4. The main factor influencing the performance of aircraft is the mass deposited on them ice

Explanation

Icing on the wings disrupts the smooth airflow required to generate lift.

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