Order 7110.65P, Air Traffic Control, with changes

Pilot/Controller Glossary 2/19/04Regulations Part 91, prescribes standard takeoff rulesfor certain civil users. At some airports, obstructionsor other factors require the establishment of nonstandardtakeoff minimums, departure procedures, orboth to assist pilots in avoiding obstacles duringclimb to the minimum en route altitude. Thoseairports are listed in FAA/DOD Instrument ApproachProcedures (IAPs) Charts under a section entitled“IFR Takeoff Minimums and Departure Procedures.”The FAA/DOD IAP chart legend illustrates thesymbol used to alert the pilot to nonstandard takeoffminimums and departure procedures. When departingIFR from such airports or from any airports wherethere are no departure procedures, DPs, or ATCfacilities available, pilots should advise ATC of anydeparture limitations. Controllers may query a pilotto determine acceptable departure directions, turns,or headings after takeoff. Pilots should be familiarwith the departure procedures and must assure thattheir aircraft can meet or exceed any specified climbgradients.IF/IAWP− Intermediate Fix/Initial Approach Waypoint.The waypoint where the final approach courseof a T approach meets the crossbar of the T. Whendesignated (in conjunction with a TAA) this waypointwill be used as an IAWP when approaching theairport from certain directions, and as an IFWP whenbeginning the approach from another IAWP.IFWP− Intermediate Fix WaypointILS−(See INSTRUMENT LANDING SYSTEM.)ILS CATEGORIES− 1. ILS Category I. An ILSapproach procedure which provides for approach toa height above touchdown of not less than 200 feetand with runway visual range of not less than 1,800feet.− 2. ILS Category II. An ILS approach procedurewhich provides for approach to a height abovetouchdown of not less than 100 feet and with runwayvisual range of not less than 1,200 feet.− 3. ILSCategory III:a. IIIA.−An ILS approach procedure which providesfor approach without a decision height minimumand with runway visual range of not less than700 feet.b. IIIB.−An ILS approach procedure which providesfor approach without a decision heightminimum and with runway visual range of not lessthan 150 feet.c. IIIC.−An ILS approach procedure which providesfor approach without a decision height minimumand without runway visual range minimum.ILS PRM APPROACH− An instrument landingsystem (ILS) approach conducted to parallel runwayswhose extended centerlines are separated by less than4,300 feet and the parallel runways have a PrecisionRunway Monitoring (PRM) system that permitssimultaneous independent ILS approaches.IM−(See INNER MARKER.)IMC−(See INSTRUMENT METEOROLOGICALCONDITIONS.)IMMEDIATELY− Used by ATC or pilots when suchaction compliance is required to avoid an imminentsituation.INCERFA (Uncertainty Phase) [ICAO]− A situationwherein uncertainty exists as to the safety of anaircraft and its occupants.INCREASE SPEED TO (SPEED)−(See SPEED ADJUSTMENT.)INERTIAL NAVIGATION SYSTEM− An RNAVsystem which is a form of self-contained navigation.(See Area Navigation/RNAV.)INFLIGHT REFUELING−(See AERIAL REFUELING.)INFLIGHT WEATHER ADVISORY−(See WEATHER ADVISORY.)INFORMATION REQUEST− A request originatedby an FSS for information concerning an overdueVFR aircraft.INITIAL APPROACH FIX− The fixes depicted oninstrument approach procedure charts that identifythe beginning of the initial approach segment(s).(See FIX.)(See SEGMENTS OF AN INSTRUMENTAPPROACH PROCEDURE.)INITIAL APPROACH SEGMENT−(See SEGMENTS OF AN INSTRUMENTAPPROACH PROCEDURE.)INITIAL APPROACH SEGMENT [ICAO]− Thatsegment of an instrument approach procedurePCG I−2