Abstract. The paper presents the design features of helicopter rotors, varieties of color sensors, including those made on the basis of hydrogenated amorphous silicon films with spectral sensitivity of the human eye, a block diagram of a device that monitors the quality of helicopter engine oil and turbidity, which determines the loss of alignment of the helicopter rotor with the engine shaft.

Keywords: helicopter, main rotor, color sensor, bearings, oil in helicopter engine, reference oil, fiber optic, LED, aircraft, temperature.