instrument+visibility

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• Instrument meteorological conditions — (IMC), sometimes referred to as Blind flying, is an aviation term that describes weather conditions that normally require pilots to fly primarily by reference to instruments, and therefore under Instrument Flight Rules (IFR), rather than by… …   Wikipedia

• Instrument flight rules — (IFR) are a set of regulations and procedures for flying aircraft whereby navigation and obstacle clearance is maintained with reference to aircraft instruments only , while separation from other aircraft is provided by Air Traffic Control. In… …   Wikipedia

• Instrument rating — refers to the qualifications that a pilot must have in order to fly under IFR (Instrument Flight Rules). It requires additional training and instruction beyond what is required for a Private Pilot certificate or Commercial Pilot certificate,… …   Wikipedia

• Instrument approach — Terminal procedures for an ILS approach in the United States. (The disclaimers shown in red in the illustration do not appear on the original approach plate.) For aircraft operating under instrument flight rules (IFR), an instrument approach or… …   Wikipedia

• Instrument landing system — The Instrument Landing System (ILS) is a ground based instrument approach system that provides precision guidance to an aircraft approaching a runway, using a combination of radio signals and, in many cases, high intensity lighting arrays to… …   Wikipedia

• instrument runway/instrument approach runway — A runway equipped with visual and electronic navigational aids for which a precision or a nonprecision approach with straight in landing minimums has been approved. There may be more than one instrument runway on an airfield. The various types of …   Aviation dictionary

• Visibility — In meteorology, visibility is a measure of the distance at which an object or light can be clearly discerned. It is reported within surface weather observations and METAR code either in meters or statute miles, depending upon the country.… …   Wikipedia

• instrument landing — noun an aircraft landing made entirely by means of instruments • Hypernyms: ↑aircraft landing, ↑airplane landing * * * noun : a landing made with no external visibility and solely by means of instruments within an airplane and by ground radio… …   Useful english dictionary

• visibility meter — noun : an instrument for measuring visibility * * * any instrument for measuring the visual range through the atmosphere, as a transmissometer. [1955 60] …   Useful english dictionary

• instrument flying — noun navigation of an airplane solely by instruments (Freq. 1) • Hypernyms: ↑navigation, ↑pilotage, ↑piloting * * * noun : navigation solely according to information given by instruments within an airplane usually including radio or radar devices …   Useful english dictionary

• instrument landing system — ▪ aviation       electronic guidance system designed to help airline pilots align their planes with the centre of a landing strip during final approach under conditions of poor visibility. The ground equipment of the ILS consists of two… …   Universalium