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  2. Visual flight rules - Wikipedia

    en.wikipedia.org/wiki/Visual_flight_rules

    The pilot is required to maintain VFR separation distances from other aircraft and, by requesting SVFR, asserts that they can do so despite the marginal conditions. For departing flights, the pilot must be flying in VMC by the time they leave the surface footprint of the controlled airspace (otherwise they would be flying VFR in IMC which is ...

  3. Instrument meteorological conditions - Wikipedia

    en.wikipedia.org/wiki/Instrument_meteorological...

    Conditions that are above VMC minima but relatively close to one or more of them are sometimes referred to as marginal VMC, and flight in such conditions is referred to as marginal VFR. [2] Summary of United States VMC minima (14 CFR 91.155), providing requirements for minimum visibility and separation from clouds for different airspace classes.

  4. Visual meteorological conditions - Wikipedia

    en.wikipedia.org/wiki/Visual_meteorological...

    VFR / VMC visibility requirements in the US. In aviation, visual meteorological conditions (VMC) is an aviation flight category in which visual flight rules (VFR) flight is permitted—that is, conditions in which pilots have sufficient visibility to fly the aircraft maintaining visual separation from terrain and other aircraft.

  5. Instrument flight rules - Wikipedia

    en.wikipedia.org/wiki/Instrument_flight_rules

    In the US, weather conditions are forecast broadly as VFR, MVFR (marginal visual flight rules), IFR, or LIFR (low instrument flight rules). [ 11 ] The main purpose of IFR is the safe operation of aircraft in instrument meteorological conditions (IMC).

  6. Special visual flight rules - Wikipedia

    en.wikipedia.org/wiki/Special_visual_flight_rules

    It usually happens when the aircraft is inside controlled airspace, and the local weather is less than the minimums required for flight under visual flight rules (VFR) within the airspace in question. [5] Note that an aircraft might be able to fly under SVFR even in Class A airspace, where instrument flight rules (IFR) flight is the norm. [6]

  7. METAR - Wikipedia

    en.wikipedia.org/wiki/METAR

    Marginal VFR Between 3 and 5 mi and/or between 1,000 and 3,000 ft AGL IFR: 1 mi or more but less than 3 mi and/or 500 ft or more but less than 1,000 ft

  8. What Is the Marginal vs. Effective Tax Rate? - AOL

    www.aol.com/finance/marginal-vs-effective-tax...

    Marginal Tax Rate vs. Effective Tax Rate: Key Differences. Your effective tax rate will always be lower than your marginal tax rate because the IRS taxes your income at the lowest rate first ...

  9. VFR over-the-top - Wikipedia

    en.wikipedia.org/wiki/VFR_Over-The-Top

    The Canadian rules specify that an aircraft may be operated in VFR OTT flight during the cruise portion of the flight during the day, at a vertical distance from clouds of at least 1000 feet. When the aircraft is operated between two cloud layers, the vertical distance between the layers must be at least 5000 feet.