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Can you please help me, how do you understand correction factor reducing OAT by 4°C for power check performed on SD2 equipped with FDC filters (ref. RFMS 1350-2200)? Engine performance physically is reduced when FDC is installed. So based RFMS it is allowed to operate helicopter conditionally in the case when power check results doesn't meet Soloy SD2 RFMS Basic Performance, then several conditions must be met: - more often power check - power check results with OAT 4°C reduction must be positive. But it doesn't make sense in my opinion because when we reduce OAT by 4°C the result wil