Transborder = Refers to transportation between Canada and the USA.

 Transbarder Rate = Rates appiicablo between Canada and the  USA.

 Transfer = Movement of cargo from one carrierto another against a trasfer manifest.

 Transter Manifest = Means the document executed by the trasferring carrier upon transfer of interLine cargo and endorsed by the receiving carrier as a receipt for the consignment transferred.

 Transfer of control pomi = A defined point Iocated along the flight path of an aircraft, at which the responsibility for providing airtraffic control service to the aircraft Is transferred from one control unit or control position to the next.

 Trasterring carrier = The participating carrier transferring the consignment tu another carrier at a transfer point.

 Translerring unii = Air traffic contro! unit in the process of transferring the responsibility for providing air traffic control service to an aircraft to the next air traffic contro! unit along the route offlight.

 Transferring unit/controller = Air traffic control unit/air traffic controiier in the process of transferring the responsibility for providing airtraffic controi service to an aircraft to the next airtraffic control unit/air traffic controiler along the route of fiight.

 Transhipment Freight that switches aircraft before final destination, often tu take advantage of cheaper rates.

 Transhipment The unloading of cargo from one fLight and Ioading onto another for oncarriage.

 Transit = A route stopping piace where cargo remains un board.

 Transit air cargo manitest (TACM) = Produres under which air cargo imports move through the gateway city tu the city of tinai U.S. Cistoms destination forthe coliection of duty and other import processing, thereby expediting shipment movements, reducing gateway congestion, and saving expense for importers, the Customs Bureau, and the airlines.

 Transition altitude = The aititude at or beiow which the verticai position of an aircraft is controiied by reference to aititudes.

 Transition Iayer = The airspace between the transition aititude and the transition ievei.

 Transition Ievel = The iowest flight ievei avai!abie for use above the transition aititude.

Transit time = The eLapsed time between the instant of filing a message with an AFTN statiun for trasmission un the network, and the instant that it Is made avaiiable tu the addresses.

 Transmission rate = The average number of puise pairs transm?tted from the transponder per second.

 Transport Index = The number expressing the maximum radiatiun ievei in a package of ULD.

 Transportation = (Aiso known as Carriage) This means the carriage of cargo by air, whether gratuitosly or for reward.

 Transportation Dacuments = Transportation receipts or transpurtatiun contracts issued by carriers.

 TRC = Cathode-ray tube.

 TRF = Transfer (ed) (ing) (Transhipment) foiiowed by date and air carrier tu whom transferred, e.g. ?TRF1 400TAA?.

 Tributary station = An aeronautica! fixed statico that may receive or transmit messages and/or digital data but which does nut relay exceptforthe purpose of servig simiiarstations connectedthrough it tu a communication centre.

 Trip = The entire passage consisting of one or more fiight iegs, from ieaving the airport of origin tu arrivai at the airport uf finai destination and operated under one fiight number.

 TRM = Transfer Manifest.

 Trouble = An unactual or suspected malfunction, falLire or defect.

 Trouhleshooting = Locating and diagnusing maifunctions or breakdowns in equipment by means ot systematic checking or analysis.

TRSB = Time reference scanning beam.

 Truck/Air service = The surface movement of air treight tu and from airpurts and origin and destination puints beyond the terminai area uf pickup and delivery service. Directory listing cities served is avaiiable throught your locai airline office.

 TT = Teietypewriter.

 TU = Tunis Air.

 Turn back air (Technical) = The return uf an aircraft tu the airpurt of urigin as a resuit uf the maifunction or suspected maifunctiun of any item un the aircraft.

Note: The term Air Turn Back refers tu specific type uf Air interruptiun.  

Turn hack ground (Technical) = A ground turn back occurs when an aircraft Ieaves the block and returns for a technical reason before stanting its takeoff roII.

Note.? if the takeoff roiI has started but the aircraft returns before takeoff, the result is an Aborted takeoff. The term ground turn back refers to a specific type of ground interruption. 

TW = Trans World Airiines Inc.

 TX = Taxes (Charges Codes).

 Type = The unique designation given to aircraft on the Type Certificato, or, for equipment, the equivalent approvai certificate, granted by an airworthiness authority. lt Is the highest ieve? of identity.

Note: ?Type? could be subdivided into: Model, Series, Mark, Version, or other subdivision as may be appropriato.

 Twa-i requency glide path system = An ILS glide path in which coverage Is achieved by the use of two independent radiation field patterns spaced on separate carrier frequencies within the particuiar glide path channel.

 Twa-i requency Iacalizer system = A localizer system in which coverage is achieved by the uso of two independent radiation field patterns spaced on separate carrier frequencies within the particular localizer VHF channel.

 U = Pivot Weight and applicable Pivot Weight Charge (Rate Class Codes).

 U.L.D. (Unit Load Device) = Term commonly used when referring to containers and pallets.

 UA = United Airlines.

 UAR Upper air route.

 UBAG = Unaccompanied Baggage.

 UC = LADECO - Linea A?rea del Cobre SA.

 UH = ULD Handling (Charges Codes).

 UHF Uitra-high frequencies.

 UIAA = International Union of Avition Insurers.

 UIC = Upper information centro.

 UIR = Upper flight information region.

UK = Air UK.

 UKACC = United Kingdom Air Cargo Club.

 ULD = Unit Load Device. Any type of container or pallet, as defined in Rule 3.1 0.2 in which a consignment can be transported, whether or not such container is considered as aircraft equipment.

 Ultimate load = The limit load multiplied by the appropriato factor of safety.

 UN = Unable, Flight does not operate.

 UN number = The four-digit number assigned by the United

Nations Committee of Experts on the Transport of Dangerous

Goodsto identify a substance ora particulargroup of substances.

 Unaccampanied baggage = Baggage carried as cargo (see Rule 3.7.8).

 Unburned hydrocarbans = The total of hydrocarbons compounds of all classes and molecular weights contained in a gas sample, calculated as if they were in the form of methane.

 Uncertainty phase = A situation wherein uncertainty exists as to the safety of an aircraft and its occupants.

 Under cammand = An aeroplano on the surface of the water Is ?under command when It is able to execute manoeuvres as required by the international Regulations for Preventing Collisions at Sea for the purpose of avoiding other vessels.

 Under way = An aeroplane on the surface of the water Is ?under way? when it Is not aground or moored to the ground orto any fixed object on the land or in the water.

 Unii = Any self-contained part, combination of parts, subassemblies or units, which perform a distinctive function necessary to the operation of a system.

 Unii Line Replaceahle = A unit which can be readily changed on an aircraft during lino maintenance operations.

 Unitisation The packing of single or multiple 000signments into ULD or pallets.

 Uniizatian = The practice or technique of consolidating many small pieces of freight into a single unit.

 Unii Laad Device (ULD) = Any type of container or paliet, as defined in Rule 3.10.2 in which a consignment can be transported, whether or not such container Is considered as aircraftequipment.