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see also: instrument approach waypoints

Fr: point de cheminement d’approche initiale
initial contact The initial voice contact between a facility and an aircraft, using the identification of the unit being called and the unit initiating the call. Fr: contact initial
initial point
On the H-hour control line, the point at which the faker route portion of the exercise begins.
. abbreviation: IP
Fr: point initial
inland navigation fix A fix on a North American route (NAR) at which the common route or the non-common route begins or ends.
. abbreviation: INF
Fr: repère de navigation intérieure
inner marker U.S.: A marker beacon used with an instrument landing system (ILS) (CAT II) precision approach located between the middle marker and the end of the ILS runway, transmitting a radiation pattern keyed at six dots per second and indicating to the pilot, both aurally and visually, that he/she is at the designated decision height (DH), normally 100 ft above the touchdown zone elevation, on the ILS CAT II approach. It also marks progress during a CAT III approach.
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abbreviation: IM

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also called: inner marker beacon

inner marker beacon U.S.: Other expression for: inner marker (IM)
INREQ Abbreviation for: information request Fr: INREQ
instrument approach Other expression for: instrument approach procedure (IAP)
instrument approach chart An aeronautical chart that depicts the aeronautical data required to execute an instrument approach procedure (IAP) to an airport. These charts depict the procedures, including all related data, and the airport diagram. Each procedure is designated for use with a specific type of electronic navigation system, including non-directional beacon (NDB), tactical air navigation aid (TACAN), VHF omnidirectional range (VOR), instument landing system (ILS)/microwave landing system (MLS), and area navigation (RNAV). These charts are identified by the type of NAVAID providing final approach guidance. Fr: carte d’approche aux instruments
instrument approach procedure A series of predetermined manoeuvres by reference to flight instruments with specified protection from obstacles from the initial approach fix, or where applicable, from the beginning of a defined arrival route to a point from which a landing can be completed and thereafter, if a landing is not completed, to a position at which holding or en route obstacle clearance criteria apply.
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abbreviation: IAP

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also called: instrument approach

Fr: procédure d’approche aux instruments
instrument approach waypoints Geographic positions, given in degrees of latitude and longitude, used in defining instrument approach procedures (IAP). Waypoints may be coded in aircraft navigation data bases and depicted on instrument approach charts as either fly-by waypoints (turn anticipation permitted) or fly-over waypoints (turn anticipation not permitted). Waypoints that define the missed approach point (MAP) and the missed approach holding waypoint (MAHWP) shall be coded as fly-over waypoints.