(4)
BASE LEG - A flight path at right angles to the landing runway off its approach end. The base leg normally extends from the downwind leg to the intersection of the extended runway centerline.

(5)
FINAL APPROACH - A flight path in the direction of landing along the extended runway centerline. The final approach normally extends from the base leg to the runway. An aircraft making a straight-in approach VFR is also considered to be on final approach.

(See Taxi Patterns, Straight-In Approach VFR) (Refer to Federal Air Regulations Part 91)
TRANSCRIBED WEATHER BROADCAST/TWEB - A continuous recording of meteorological and aeronautical information that is broadcast on L/MF and VOR facilities for pilots.
TRANSFER OF CONTROL (P/CG) - That action whereby the responsibility for the separation of an aircraft is transferred from one controller to another.
TRANSFER OF CONTROL (ICAO) - Transfer of responsibility for providing air traffic control service.
TRANSFERRING CONTROLLER/FACILITY (P/CG) - A controller/facility transferring control of an aircraft to another controller/facility.
TRANSFERRING UNIT/CONTROLLER (ICAO) - Air Traffic Control Unit/Air Traffic Controller in the process of transferring the responsibility for providing air traffic control service to an aircraft to the next Air Traffic Control Unit/Air Traffic Controller along the route of flight.
TRANSITION -
(1)
The general term that describes the change from one phase of flight or flight condition to another, e.g., transition from enroute flight to the approach or transition from instrument flight to visual flight.

(2)
A published procedure (SID Transition) used to connect the basic Standard Instrument Departure to one of several enroute airways/jet routes, or a published procedure (STAR Transition) used to connect one of several enroute

airways/jet routes to the basic Standard Terminal Arrival Route. (Refer to SID/STAR Charts)
TRANSITION ALTITUDE (NATO, ICAO) - The altitude in the vicinity of an aerodrome at or below which the vertical position of an aircraft is controlled by reference to altitudes.
TRANSITION AREA - (See Controlled Airspace)
TRANSITION LAYER (JCS, NATO, ICAO) - The airspace between the Transition Altitude and the Transition Level.
TRANSITION LEVEL (JCS, NATO, ICAO) - The lowest Flight Level available for use above the Transition Altitude.
TRANSITION POINT (P/CG) - A point at an adapted number of miles from the vertex at which an arrival aircraft would normally commence descent from its en route altitude. This is the first fix adapted on the arrival speed segments.
TRANSITIONAL AIRSPACE (P-CG) - That portion of controlled airspace wherein aircraft change from one phase of flight or flight condition to another.
TRANSMISSOMETER - An apparatus used to determine visibility by measuring the transmission of light through the atmosphere. It is the measurement source for determining Runway Visual Range (RVR) and Runway Visibility Value (RVV). (See Visibility)