Order 7110.65P, Air Traffic Control, with changes

2/17/05Pilot/Controller Glossaryproceed under specified traffic conditions withincontrolled airspace. The pilot-in-command of anaircraft may not deviate from the provisions of avisual flight rules (VFR) or instrument flight rules(IFR) air traffic clearance except in an emergency orunless an amended clearance has been obtained.Additionally, the pilot may request a differentclearance from that which has been issued by airtraffic control (ATC) if information available to thepilot makes another course of action more practicableor if aircraft equipment limitations or companyprocedures forbid compliance with the clearanceissued. Pilots may also request clarification oramendment, as appropriate, any time a clearance isnot fully understood, or considered unacceptablebecause of safety of flight. Controllers should, insuch instances and to the extent of operationalpracticality and safety, honor the pilot’s request.14 CFR Part 91.3(a) states: “The pilot in commandof an aircraft is directly responsible for, and is thefinal authority as to, the operation of that aircraft.”THE PILOT IS RESPONSIBLE TO REQUEST ANAMENDED CLEARANCE if ATC issues a clearancethat would cause a pilot to deviate from a rule orregulation, or in the pilot’s opinion, would place theaircraft in jeopardy.(See ATC INSTRUCTIONS.)(See ICAO term AIR TRAFFIC CONTROLCLEARANCE.)AIR TRAFFIC CONTROL− A service operated byappropriate authority to promote the safe, orderly andexpeditious flow of air traffic.(See ICAO term AIR TRAFFIC CONTROLSERVICE.)AIR TRAFFIC CONTROL CLEARANCE [ICAO]−Authorization for an aircraft to proceed underconditions specified by an air traffic control unit.Note 1: For convenience, the term air traffic controlclearance is frequently abbreviated to clearancewhen used in appropriate contexts.Note 2: The abbreviated term clearance may beprefixed by the words taxi, takeoff, departure, enroute, approach or landing to indicate the particularportion of flight to which the air traffic controlclearance relates.AIR TRAFFIC CONTROL SERVICE−(See AIR TRAFFIC CONTROL.)AIR TRAFFIC CONTROL SERVICE [ICAO]− Aservice provided for the purpose of:a. Preventing collisions:1. Between aircraft; and2. On the maneuvering area between aircraftand obstructions.b. Expediting and maintaining an orderly flow ofair traffic.AIR TRAFFIC CONTROL SPECIALIST− A personauthorized to provide air traffic control service.(See AIR TRAFFIC CONTROL.)(See FLIGHT SERVICE STATION.)(See ICAO term CONTROLLER.)AIR TRAFFIC CONTROL SYSTEM COMMANDCENTER− An Air Traffic Tactical Operations facilityresponsible for monitoring and managing the flowof air traffic throughout the NAS, producing a safe,orderly, and expeditious flow of traffic whileminimizing delays. The following functions arelocated at the ATCSCC:a. Central Altitude Reservation Function(CARF). Responsible for coordinating, planning,and approving special user requirements under theAltitude Reservation (ALTRV) concept.(See ALTITUDE RESERVATION.)b. Airport Reservation Office (ARO). Responsiblefor approving IFR flights at designated highdensity traffic airports (John F. Kennedy, LaGuardia,and Ronald Reagan Washington National) duringspecified hours.(Refer to 14 CFR Part 93.)(Refer to AIRPORT/FACILITY DIRECTORY.)c. U.S. Notice to Airmen (NOTAM) Office.Responsible for collecting, maintaining, and distributingNOTAMs for the U.S. civilian and military, aswell as international aviation communities.(See NOTICE TO AIRMEN.)d. Weather Unit. Monitor all aspects of weatherfor the U.S. that might affect aviation including cloudcover, visibility, winds, precipitation, thunderstorms,icing, turbulence, and more. Provide forecasts basedon observations and on discussions with meteorologistsfrom various National Weather Service offices,FAA facilities, airlines, and private weather services.AIR TRAFFIC SERVICE− A generic term meaning:a. Flight Information Service.b. Alerting Service.c. Air Traffic Advisory Service.d. Air Traffic Control Service:PCG A−5