Explanation for VFR, MVFR, IFR, and LIFR?

Rules in aviation?

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  • 8 years ago
    Best Answer

    visual flight rules: flying with visual reference to the ground.

    instrument flight rules: flying without visual reference to the ground.

    marginal vfr: vmc with visibility less than 5 nautical miles and/or ceiling less than 3000 feet.

    people are often sloppy on vfr (visual flight rules) and vmc (visual meteorological conditions). ditto imc/ifr and low ifr, imc with very low ceiling/visibility.

    ever heard of a search engine? are you from india or something?

  • 8 years ago

    VFR - Visual Flight Rules

    Flying and navigating the aircraft, by reference to the natural horizon and features on the ground or water.

    NVFR - Night Visual Flight Rules

    Flying the aircraft, by visual reference however at night... However at night because you can't see the horizon as well or features on the ground or water, especially if its a moonless night... about 50%- 80% is done on instruments, depending on where you are.

    To fly VFR or NVFR a pilot must maintain what is known as Visual Meteorological Conditions (VMC) the pilot must maintain a certain visibility and vertical and horizontal distance from cloud at all times.. Otherwise s/he would be breaking the law

    IFR - Instrument Flight Rules

    Flying and navigating the aircraft by sole reference to the instruments only.. Only the take off and landing are done visually,

    Its mainly for bad weather, where visibility is reduced and you cant see the horizon to maintain the aircraft attitude and ground features to navigate..

    Keep is mind, you may also fly IFR even if the weather is good... It is just a set of rules pilots follow..

    To be able to fly IFR, you also need an Instrument rating.. Because flying under instruments requires a fair bit of skill

    ... VFR is the default form of flying when a pilot is issued a licence..

  • 8 years ago

    VFR stands for Visual Flight Rules. This means that the airport is allowing planes to navigate using the horizon and ground below. You can always use your instruments to help- VFR just allows the alternative.

    MVFR stands for Marginal VFR. This means that it is still ok to not rely on your instruments, but you should use caution, as conditions could change to IFR.

    IFR stands for Instrument Flight Rules. This means that you must use your instruments to help detect planes and navigate.

    LIFR stands for Low IFR. This means that the ceiling (cloud height) is very low. (<500 ft MSL)

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