Instrument Flight Rules Turbulence Visual Meteorological Conditions (VMC) 
Pilot Institute
MARCH 6, 2025
IFR Instrument Flight Rules IFR is the set of rules that allow pilots to fly by reference to instruments in the flight deck when flying by visual reference is not safe. These conditions can affect the performance of smaller or less equipped aircraft. A SIGMET is usually valid for four hours.
Professional Pilot
JANUARY 2, 2025
Additional operational modes include instrument meteorological conditions (IMC) navigation guidance, primary mode for all flight phases, and visual meteorological conditions (VMC) mode for visual glideslope display to the runway touchdown point, which is ideal for night approaches.
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