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  2. Instantaneous wave-free ratio - Wikipedia

    en.wikipedia.org/wiki/Instantaneous_wave-free_ratio

    The instantaneous wave-free ratio (iFR, sometimes referred to as the instant wave-free ratio or instant flow reserve) is a diagnostic tool used to assess whether a stenosis is causing a limitation of blood flow in coronary arteries with subsequent ischemia. iFR is performed during cardiac catheterisation (angiography) using invasive coronary pressure wires which are placed in the coronary ...

  3. Instrument rating in the United States - Wikipedia

    en.wikipedia.org/wiki/Instrument_Rating_in_the...

    Under FAR 61.57, to be eligible to fly in Instrument Meteorological Conditions (IMC) an IFR-rated pilot must accomplish and log at least the following IFR procedures under actual or simulated IMC every 6 months: 6 instrument approaches. Holding procedures. Intercepting and tracking courses through the use of navigation systems.

  4. Instrument flight rules - Wikipedia

    en.wikipedia.org/wiki/Instrument_flight_rules

    The U.S. Federal Aviation Administration's (FAA) Instrument Flying Handbook defines IFR as: "Rules and regulations established by the FAA to govern flight under conditions in which flight by outside visual reference is not safe. IFR flight depends upon flying by reference to instruments in the flight deck, and navigation is accomplished by ...

  5. Instrument rating - Wikipedia

    en.wikipedia.org/wiki/Instrument_rating

    Instrument rating refers to the qualifications that a pilot must have in order to fly under instrument flight rules (IFR). It requires specific training and instruction beyond what is required for a private pilot certificate or commercial pilot certificate, including rules and procedures specific to instrument flying, additional instruction in meteorology, and more intensive training in flight ...

  6. Visual flight rules - Wikipedia

    en.wikipedia.org/wiki/Visual_flight_rules

    The pilot must be able to operate the aircraft with visual reference to the ground, and by visually avoiding obstructions and other aircraft. [ 1 ] If the weather is less than VMC, pilots are required to use instrument flight rules , and operation of the aircraft will be primarily through referencing the instruments rather than visual reference.

  7. Attitude indicator - Wikipedia

    en.wikipedia.org/wiki/Attitude_indicator

    AI with pitch and roll reference lines (left) and the AI relationship to aircraft orientation (right) The attitude indicator ( AI ), also known as the gyro horizon or artificial horizon , is a flight instrument that informs the pilot of the aircraft orientation relative to Earth's horizon , and gives an immediate indication of the smallest ...

  8. Instrument approach - Wikipedia

    en.wikipedia.org/wiki/Instrument_approach

    An "approach plate" depicting an instrument approach procedure for an ILS approach to Tacoma Narrows Airport in the United StatesIn aviation, an instrument approach or instrument approach procedure (IAP) is a series of predetermined maneuvers for the orderly transfer of an aircraft operating under instrument flight rules from the beginning of the initial approach to a landing, or to a point ...

  9. Integral fast reactor - Wikipedia

    en.wikipedia.org/wiki/Integral_fast_reactor

    Most of the radioactive fission products produced by an IFR have much shorter half-lives: they are intensely radioactive in the short term but decay quickly. Through many cycles, the IFR ultimately causes 99.9% of the uranium and transuranium elements to undergo fission and produce power; so, its only waste is the nuclear fission products ...