IFR

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 and separation from other aircraft is provided by Air Traffic Control. It is an alternative to visual flight rules (VFR), where the pilot is ultimately responsible for navigation, obstacle clearance and traffic separation using the see-and-avoid concept. The primary benefit of these regulations allow an aircraft to safely fly through clouds, which is not permitted under VFR.
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An authorization by Air Traffic Control (ATC) requiring pilots to submit only that information needed for the purpose of ATC. It includes only a small portion of the usual Instrument Flight Rules (IFR) flight plan information. In certain instances, this may be only aircraft identification, location, and pilot request. Other information may be requested if needed by ATC for separation/control purposes. It is frequently used by aircraft which are airborne and desire an instrument approach or by aircraft which are on the ground and desire a climb to Visual Flight Rule (VFR)-on-top. (FAA4)

Rules governing the procedures for conducting instrument flight. Also a term used by pilots and controllers to indicate type of flight plan. (FAA2) (FAA4) (FAA6) (FAA13) (FAA14)

An aircraft conducting flight in accordance with instrument flight rules (IFR). (FAA8)

The number of Instrument Flight Rules (IFR) departures multiplied by two plus the number of IFR overs. This definition assumes that the number of departures (acceptances, extensions, and originations of IFR flight plans) is equal to the number of landings (IFR flight plans closed). (FAA2) (FAA13) (FAA14)

Weather conditions below the minimum for flight under visual flight rules (VFR). (14CFR1)

An Instrument Flight Rules (IFR) departure includes IFR flights originating in center's area, accepted by the center under SOLE EN ROUTE clearance procedures, and extended by the center. (FAA2) (FAA13) (FAA14)

An Instrument Flight Rules (IFR) flight that originates outside the Air Route Traffic Control Center (ARTCC) area and passes through the area without landing. (FAA2) (FAA13) (FAA14)

With respect to the operation of aircraft, means the operation of an aircraft over-the-top on an Instrument Flight Rules (IFR) flight plan when cleared by air traffic control to maintain "visual flight rules (VFR) conditions" or "VFR conditions on top." (14CFR1)

Federal Aviation Regulations, Part 91, prescribes standard takeoff rules for certain civil users. At some airports, obstructions or other factors require the establishment of nonstandard takeoff minimums, departure procedures, or both to assist pilots in avoiding obstacles during climb to the minimum en route altitude. Those airports are listed in National Airspace System (NAS)/Department of Defense (DOD) Instrument Approach Plate (IAP) Charts (W's) under a section entitled "IFR Takeoff Minimums and Departure Procedures." The IAP chart legend illustrates the symbol used to alert the pilot to nonstandard takeoff minimums and departure procedures. When departing Instrument Flight Rules (IFR) from such airports or from any airports where there are no departure procedures, standard instrument departures (SID's), or Air Traffic Control (ATC) facilities available, pilots should advise ATC of any departure limitations. Controllers may query a pilot to determine acceptable departure directions, turns, or headings after takeoff. Pilots should be familiar with the departure procedures and must assure that their aircraft can meet or exceed any specified climb gradients. (FAA4)

Routes used by the Department of Defense and associated Reserve and Air Guard units for the purpose of conducting low altitude navigation and tactical training in both Instrument Flight Rules (IFR) and Visual Flight Rules (VFR) weather conditions below 10,000 feet Main Sea Level (MSL) at airspeeds in excess of 250 knots Indicated Airspeed (IAS). (FAA4)

The lowest published altitude between radio fixes which assures acceptable navigational signal coverage and meets obstacle clearance requirements between those fixes. The Minimum En Route Altitude (MEA) prescribed for a federal airway, or segment thereof, area navigation low or high route, or other direct route applies to the entire width of the airway, segment, or route between the radio fixes defining the airway, segment or route. (FAA4) (FAA8)

Minimum altitudes for Instrument Flight Rules (IFR) operations as prescribed in Federal Aviation Regulations (FAR) Part 91. (FAA8)

Routes established between busier airports to increase system efficiency and capacity. They normally extend through one or more Air Route Traffic Control Center (ARTCC) areas and are designed to achieve balanced traffic flows among high density terminals. Instrument Flight Rules (IFR) clearances are issued on the basis of these routes except when severe weather avoidance procedures or other factors dictate otherwise. Preferred IFR Routes are listed in the Airport/Facility Directory. If a flight is planned to or from an area having such routes but the departure or arrival point is not listed in the Directory, pilots may use that part of a Preferred IFR Route which is appropriate for the departure or arrival point that is listed. Preferred IFR Routes are correlated with standard instrument departures (SID) and standard terminal arrival routes (STAR) and may be defined by airways, jet routes, direct routes between NAVAID's, Waypoints, NAVAID radials/distance measuring equipment (DME), or any combinations thereof. (FAA4)

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Instrument Flight Rules
  

Instrument Flight Rules