Helicopters are used in a variety of tasks like sea, mountain and land search and rescue, civil transportation or military operations. Their amount is growing, their ceiling is usually low, however, the exhaust emission from their engines is not restricted by any directive. That is why an attempt was made to determine the real exhaust emission. The research was done on the W-3 helicopter during the preflight engine run. Based on the results set the standard was created which reflects the working conditions of the engines during the test cycle. The research allowed to establish the unit emission of toxic gasses and then the influence on environment of the engines
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