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Terms for subject Aviation (1801 entries)

transition	trn
true airspeed	The airspeed of an aircraft relative to undisturbed air. It is used primarily in flight planning and the en route portion of flight. When used in pilot/controller communications, it is referred to as "true airspeed" and not shortened to "airspeed."
true Mach number	A ratio of the true airspeed of an aircraft to the local speed of sound at the flight altitude
TOT	turbine outlet temperature	'More
turbojet aircraft	An aircraft having a jet engine in which the energy of the jet operates a turbine, which, in turn, operates the air compressor
turboprop aircraft	An aircraft that derives most of its propulsive power from the thrust developed by a turbojet engine having a turbine-driven propeller
turn circle	The radius of the turn circle
turnoff taxiway	A long-radius taxiway designed and provided with lighting or marking to define the path of aircraft, travelling at high speed (up to 60 kt) from the runway centre to a point on the centre of a taxiway. The high speed taxiway is designed to expedite aircraft turning off the runway after landing, thus reducing runway occupancy time.
twr	tower
ultrahigh frequency	The frequency band between 300 and 3000 MHz
ultralight aeroplane	An advanced ultralight aeroplane or a basic ultralight aeroplane
uncertainty phase	A phase that begins when: (a) with the exception of an arrival report, no communication has been received from an aircraft within 30 min after the time a communication should have been received, or from the time an unsuccessful attempt to establish communication with such aircraft was first made, whichever is the earlier; (b) a flight plan (FP) has been filed and no arrival report has been received by the area control centre (ACC) within 1 hr after the estimated time of arrival (ETA) last notified to or estimated by the ACC, whichever is later; (ii) at the search and rescue (SAR) time requested by the originator,whichever is earlier; (c) a flight itinerary (FI) has been filed and no arrival report has been received by the ACC (i) within 24 hrs after the latest ETA; or (ii) at the SAR time requested by the originator, whichever is earlier; (d) an FP or FI has been filed and it is determined that no arrival report can be expected either because there is no communication system serving the point of arrival or the system serving the airport is inoperative
uncertainty phase	A situation wherein uncertainty exists as to the safety of an aircraft and its occupants
uncontrolled aerodrome	An aerodrome at which a control tower has not been established. This designation also applies during the non-operational period when an established control tower is on reduced hours (part time)
uncontrolled airspace	Class G and specified Class F airspace within which ATC service is not provided
under the hood	An expression indicating that the pilot is using a hood to restrict visibility outside the cockpit while simulating instrument flight. An instrument-rated pilot is required in the other control seat while this operation is being conducted.
underway	The state of being on the surface of the water but not moored or fastened to any fixed object on the land or in the water
unducted fan	UDF	Michae­lBurov
Uniform Code of Military Justice (The legal systems governing the conduct of all members of the U.S. Armed Forces)	UCMJ
uninterruptible power supply	In ATS operations, a power system that is not subjected to any interruption when a break occurs in the normal powersupply