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Terms for subject Aviation (1846 entries)

". at pilot's discretion"	When used in conjunction with an aircraft operation on the airport apron or other surface, that is not under the control of ATC, means that it is the responsibility of the pilot to ensure that the operation is carried out safely with respect to traffic or other hazards that might be encountered during the operation
". at pilot's discretion"	When used in conjunction with altitude assignments, an expression meaning that ATC has offered the pilot the option of starting the climb or descent whenever the pilot wishes and conducting the climb or descent at any rate the pilot wishes. The pilot may temporarily level off at any intermediate altitude. However, once the pilot has vacated an altitude, the pilot may not return to that altitude.
". guard"	An expression used in radiocommunications to indicate emergency frequency 243.0 MHz.
". immediately"	An expression used by ATS when immediate compliance with an instruction is required to avoid imminent danger
". now"	An expression used by ATS when prompt compliance with an instruction is required
". position and hold"	Expression for "Line up and wait..."
"Acknowledge"	An expression used in radiocommunication meaning "Let me know that you have received and understood this message."
"Advise customs"	An expression used by pilots to request that ATS advise U.S. Customs on their behalf of the estimated time of landing at destination.
"Advise intentions"	An expression used in radiocommunication meaning "Tell me what you plan to do."
"Affirmative"	An expression used in radiocommunication meaning "Yes."
"Approved"	An expression used in radiotelecommunication meaning "Permission for proposed action granted."
"ATC clears"	An expression used to prefix an ATC clearance when it is relayed to an aircraft by someone other than the air traffic controller who issued the clearance. The expression is also used in direct controller-pilot communications (DCPC) to differentiate a clearance from an instruction.
"ATC requests"	An expression used to prefix an ATC request when it is relayed to an aircraft by someone other than the air traffic controller who made the request
"Break"	An expression used in radiocommunication meaning "I hereby indicate the separation between portions of the message."
"Break"	An expression used in radiocommunications to instruct a pilot to execute a rapid level turn
"Cancel my IFR flight plan"	An expression used by a pilot when flying on an IFR flight plan (FP) in the U.S. or landing at a Canadian airport that underlies airspace delegated to the control of the FAA, to discontinue providing IFR separation and close the FP.
"Cancelling IFR"	An expression used by a pilot, when flying on an IFR flight plan (FP) or flight itinerary (Fl) to change flight rules from IFR to VFR. As a result, ATC will discontinue providing IFR separation, but will not close the IFR FP or FI or open a VFR FP or FI.
"Chaff burst"	An expression used in radiocommunication to inform ATC of chaff drops at intervals short enough to appear on radar displays as an individual target
"Clear of runway"	In ground control, an expression indicating that a vehicle or an aircraft is at least 200 ft clear of the nearest edge of the runway in use, wherever practicable
"Clearance cancelled ..."	An expression used in radiocommunication to indicate a time specified by an ATC unit at which a clearance ceases to be valid unless the aircraft concerned has already taken action to comply therewith