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IFR AIRCRAFT/IFR FLIGHT - An aircraft conducting flight in accordance with Instrument Flight Rules.
IFR CONDITIONS - Weather conditions below the minimum for flight under Visual Flight Rules. (See Instrument Meteorological Condition)
IFR DEPARTURE PROCEDURE - (see IFR Take-off Minimums and Departure Procedures)
IFR MILITARY TRAINING ROUTES (IR) - 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 IFR and VFR weather conditions below 10,000 feet Mean Sea Level at airspeeds in excess of 250 knots indicated airspeed.
IFR TAKEOFF MINIMUMS AND DEPARTURE PROCEDURES - Federal Air Regulations, Part 91, prescribes standard take-off rules for certain civil users. At some airports, obstructions or other factors require the establishment of nonstandard take-off minimums, departure procedures, or both, to assist pilots in avoiding obstacles during climb to the Minimum Enroute Altitude. These airports are listed in National Ocean Service/Department of Defense Instrument Approach Charts (IAPs) under a section entitled "IFR Takeoff Minimums and Departure Procedures." The National Ocean Service/Department of Defense Instrument Approach Procedure chart legend illustrates the symbol used to alert the pilot to nonstandard take-off minimums and departure procedures. When departing IFR from such airports, or from any airport where there are no departure procedures, Standard Instrument Departures, or Air Traffic Control facilities available, pilots should advise Air Traffic Control of any departure limitations. Controllers may query a pilot to determine acceptable departure directions, turns, or heading after take-off. Pilots should be familiar with the departure procedures and must assure that their aircraft can meet or exceed any specified climb gradients.
ILS CATEGORIES -
(1)
Instrument Landing System CATEGORY I - An Instrument Landing System approach procedure which provides for approach to a Height Above Touchdown of not less than 200 feet and with Runway Visual Range of not less than 1800 feet.
(2)
Instrument Landing System CATEGORY II - An Instrument Landing System approach procedure which provides for approach to a Height Above Touchdown of not less than 100 feet and with Runway Visual Range of not less than 1200 feet.
(3) Instrument Landing System CATEGORY III.
(a)
IIIA - An Instrument Landing System approach procedure which provides for approach without a Decision Height minimum and with Runway Visual Range of not less than 700 feet.
(b)
IIIB - An Instrument Landing System approach procedure which provides for approach without a Decision Height minimum and with Runway Visual Range of not less than 150 feet.
(c)
IIIC - An Instrument Landing System approach procedure which provides for approach without a Decision Height minimum and without Runway Visual Range minimum.
ILS PRM APPROACH (P/CG) - An instrument landing system (ILS) approach conducted to parallel runways whose extended centerlines are separated by less than 4,300 feet and the parallel runways have a Precision Runway Monitoring (PRM) system that permits simultaneous independent ILS approaches.
IMMEDIATELY - Used by Air Traffic Control when such action is required to avoid an imminent situation.
INCREASE SPEED TO (SPEED) - (See Speed Adjustment) INDIVIDUAL FLIGHT PLAN FROM THIS POINT/IFPFP (USAF) - The point at which the aircraft flying the route will proceed on an individual flight plan to the destination.
INFORMATION REQUEST/INREQ - A request originated by a Flight Service Station for information concerning an overdue Visual Flight Rules aircraft.
INITIAL APPROACH FIX/IAF - The fix(s) depicted on Instrument Approach Procedure charts that identifies the beginning of the initial approach segments(s). (See Fix, Segments of an Instrument Approach Procedure)
INITIAL APPROACH SEGMENT - (See Segments of an Instrument Approach Procedure)
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