Propeller/rotor modulation error. Certain propeller rpm settings or helicopter rotor speeds can cause the VOR course deviation indicator (CDI) to fluctuate as much as 6 . Slight changes to the rpm setting will normally smooth out this roughness.
Defining the Language of Aviation
Propeller/rotor modulation error. Certain propeller rpm settings or helicopter rotor speeds can cause the VOR course deviation indicator (CDI) to fluctuate as much as 6 . Slight changes to the rpm setting will normally smooth out this roughness.
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