Aviation and air traffic control terminology · MLC-0104

Aviation and air traffic control terms: I (49)

I say againThe message will be repeated.
IAF, see Initial approach fix (IAF)
IAP, see Instrument approach procedure
IAWPInitial Approach Waypoint
ICAO, see International Civil Aviation Organization [ICAO]
ICAO 3LD, see ICAO three-letter designator (3LD)
ICAO three-letter designator (3LD)An ICAO 3LD is an exclusive designator that, when used together with a flight number, becomes the aircraft...
IcingThe accumulation of airframe ice.
IDAC, see Integrated departure/arrival capability (IDAC)
IdentA request for a pilot to activate the aircraft transponder identification feature. This will help the...
Ident featureThe special feature in the Air Traffic Control Radar Beacon System (ATCRBS) equipment. It is used to...
Identification [ICAO]The situation which exists when the position indication of a particular aircraft is seen on a situation...
IF, see Intermediate fix
If no transmission received for (time)Used by ATC in radar approaches to prefix procedures which should be followed by the pilot in event of lost...
IF/IAWPIntermediate Fix/Initial Approach Waypoint. The waypoint where the final approach course of a T approach...
IFR, see Instrument flight rules (IFR)
IFR aircraftAn aircraft conducting flight in accordance with instrument flight rules.
IFR conditionsWeather conditions below the minimum for flight under visual flight rules.
IFR departure procedure, see IFR takeoff minimums and departure procedures
IFR flight, see IFR aircraft
IFR landing minimums, see Landing minimums
IFR military training routes (IR)Routes used by the Department of Defense and associated Reserve and Air Guard units for the purpose of...
IFR takeoff minimums and departure proceduresTitle 14 Code of Federal Regulations, part 91, prescribes standard takeoff rules for certain civil users. At...
IFWPIntermediate Fix Waypoint
ILS, see Instrument landing system (ILS)
ILS categories1. Category I. An ILS approach procedure which provides for approach to a height above touchdown of not less...
IM, see Inner marker
IMC, see Instrument meteorological conditions (IMC)
ImmediatelyUsed by ATC or pilots when such action compliance is required to avoid an imminent situation.
INCERFA (uncertainty phase) [ICAO]A situation wherein uncertainty exists as to the safety of an aircraft and its occupants.
Increase speed to (speed), see Speed adjustment
Increased separation required (ISR)Indicates the confidence level of the track requires 5 NM separation. 3 NM separation, 1 ½ NM separation, and...
Inertial navigation system (INS)An RNAV system which is a form of self-contained navigation.
Inflight refueling, see Aerial refueling
Inflight services [FSS]Services provided to or affecting aircraft inflight or otherwise operating on the airport surface. This...
Inflight weather advisory, see Weather advisory
Information request (INREQ)A request originated by an FSS for information concerning an overdue VFR aircraft.
Initial approach fix (IAF)The fixes depicted on instrument approach procedure charts that identify the beginning of the initial...
Initial approach segment, see Segments of an instrument approach procedure
Initial approach segment [ICAO]That segment of an instrument approach procedure between the initial approach fix and the intermediate...
Inland navigation facilityA navigation aid on a North American Route at which the common route and/or the noncommon route begins or...
Inner markerA marker beacon used with an ILS (CAT II) precision approach located between the middle marker and the end of...
Inner marker beacon, see Inner marker
INREQ, see Information request (INREQ)
INS, see Inertial navigation system (INS)
Instrument approach, see Instrument approach procedure
Instrument approach operations [ICAO]An approach and landing using instruments for navigation guidance based on an instrument approach procedure...
Instrument approach procedureA series of predetermined maneuvers for the orderly transfer of an aircraft under instrument flight...
Instrument approach procedure charts, see Aeronautical chart
Instrument approach procedure [ICAO]A series of predetermined maneuvers by reference to flight instruments with specified protection from...
Instrument departure procedure (DP)A preplanned instrument flight rule (IFR) departure procedure published for pilot use, in graphic or textual...
Instrument departure procedure (DP) charts, see Aeronautical chart
Instrument flight rules [ICAO]A set of rules governing the conduct of flight under instrument meteorological conditions.
Instrument flight rules (IFR)Rules governing the procedures for conducting instrument flight. Also a term used by pilots and controllers...
Instrument landing system (ILS)A precision instrument approach system which normally consists of the following electronic components and...
Instrument meteorological conditions (IMC)Meteorological conditions expressed in terms of visibility, distance from cloud, and ceiling less than the...
Instrument runwayA runway equipped with electronic and visual navigation aids for which a precision or nonprecision approach...
Instrument runway [ICAO]One of the following types of runways intended for the operation of aircraft using instrument approach...
Integrated departure/arrival capability (IDAC)A Tower/TRACON departure scheduling capability within TBFM that allows departures to be scheduled into either...
IntegrityThe ability of a system to provide timely warnings to users when the system should not be used for navigation.
Intermediate approach segment, see Segments of an instrument approach procedure
Intermediate approach segment [ICAO]That segment of an instrument approach procedure between either the intermediate approach fix and the final...
Intermediate fixThe fix that identifies the beginning of the intermediate approach segment of an instrument approach...
Intermediate landingOn the rare occasion that this option is requested, it should be approved. The departure center, however...
International airportRelating to international flight, it means:
International airport [ICAO]Any airport designated by the Contracting State in whose territory it is situated as an airport of entry and...
International Civil Aviation Organization [ICAO]A specialized agency of the United Nations whose objective is to develop the principles and techniques of...
International noticeA notice containing flight prohibitions, potential hostile situations, or other international/foreign oceanic...
InterrogatorThe ground-based surveillance radar beacon transmitter-receiver, which normally scans in synchronism with a...
Intersecting runwaysTwo or more runways which cross or meet within their lengths.
Intersectiona. A point defined by any combination of courses, radials, or bearings of two or more navigational aids.
Intersection departureA departure from any runway intersection except the end of the runway.
Intersection takeoff, see Intersection departure
IR, see IFR military training routes (IR)
Irregular surfaceA surface that is open for use but not per regulations.
ISR, see Increased separation required (ISR)

49 of 1,122 terms in Aviation and air traffic control terminology (MLC-0104). Request the full dataset.