Order 7110.65P, Air Traffic Control, with changes

Pilot/Controller Glossary 2/19/04This time will be updated in response to an aircraft’sprogress and its current relationship to other arrivals.TERMINAL AREA− A general term used to describeairspace in which approach control service or airporttraffic control service is provided.TERMINAL AREA FACILITY− A facility providingair traffic control service for arriving anddeparting IFR, VFR, Special VFR, and on occasionen route aircraft.(See APPROACH CONTROL FACILITY.)(See TOWER.)TERMINAL RADAR SERVICE AREA− Airspacesurrounding designated airports wherein ATC providesradar vectoring, sequencing, and separation ona full-time basis for all IFR and participating VFRaircraft. The AIM contains an explanation of TRSA.TRSAs are depicted on VFR aeronautical charts.Pilot participation is urged but is not mandatory.TERMINAL VFR RADAR SERVICE− A nationalprogram instituted to extend the terminal radarservices provided instrument flight rules (IFR)aircraft to visual flight rules (VFR) aircraft. Theprogram is divided into four types service referred toas basic radar service, terminal radar service area(TRSA) service, Class B service and Class C service.The type of service provided at a particular locationis contained in the Airport/Facility Directory.a. Basic Radar Service− These services are providedfor VFR aircraft by all commissioned terminalradar facilities. Basic radar service includes safetyalerts, traffic advisories, limited radar vectoringwhen requested by the pilot, and sequencing atlocations where procedures have been established forthis purpose and/or when covered by a letter ofagreement. The purpose of this service is to adjust theflow of arriving IFR and VFR aircraft into the trafficpattern in a safe and orderly manner and to providetraffic advisories to departing VFR aircraft.b. TRSA Service− This service provides, inaddition to basic radar service, sequencing of all IFRand participating VFR aircraft to the primary airportand separation between all participating VFR aircraft.The purpose of this service is to provideseparation between all participating VFR aircraft andall IFR aircraft operating within the area defined as aTRSA.c. Class C Service− This service provides, inaddition to basic radar service, approved separationbetween IFR and VFR aircraft, and sequencing ofVFR aircraft, and sequencing of VFR arrivals to theprimary airport.d. Class B Service− This service provides, inaddition to basic radar service, approved separationof aircraft based on IFR, VFR, and/or weight, andsequencing of VFR arrivals to the primary airport(s).(See CONTROLLED AIRSPACE.)(See TERMINAL RADAR SERVICE AREA.)(Refer to AIM.)(Refer to AIRPORT/FACILITY DIRECTORY.)TERMINAL-VERY HIGH FREQUENCY OMNI-DIRECTIONAL RANGE STATION− A very highfrequency terminal omnirange station located on ornear an airport and used as an approach aid.(See NAVIGATIONAL AID.)(See VOR.)TERRAIN FOLLOWING− The flight of a militaryaircraft maintaining a constant AGL altitude abovethe terrain or the highest obstruction. The altitude ofthe aircraft will constantly change with the varyingterrain and/or obstruction.TETRAHEDRON− A device normally located onuncontrolled airports and used as a landing directionindicator. The small end of a tetrahedron points in thedirection of landing. At controlled airports, thetetrahedron, if installed, should be disregardedbecause tower instructions supersede the indicator.(See SEGMENTED CIRCLE.)(Refer to AIM.)TF−(See TERRAIN FOLLOWING.)THAT IS CORRECT− The understanding you haveis right.360 OVERHEAD−(See OVERHEAD MANEUVER.)THRESHOLD− The beginning of that portion of therunway usable for landing.(See AIRPORT LIGHTING.)(See DISPLACED THRESHOLD.)THRESHOLD CROSSING HEIGHT− The theoreticalheight above the runway threshold at which theaircraft’s glideslope antenna would be if the aircraftmaintains the trajectory established by the mean ILSglideslope or MLS glidepath.(See GLIDESLOPE.)(See THRESHOLD.)PCG T−2