takeoff. TAS True Airspeed. 38th parallel A convenient cartographic line used to divide Korea in half at the end of World War II. The Soviet Union accepted the surrender of all Japanese forces north of the 38th parallel; the United States accepted the surrender of all Japanese forces to the south. thrust The amount of power being produced by an aircraft's engine. thrust vectoring Directing the engine's exhaust to help maneuver an aircraft through tight turns. tilt-rotor aircraft Propeller aircraft which utilizes V/STOL technology. (See also V/STOL.) Tomcat Grumman F-14. trailing edge The rearmost edge of an airfoil. TRAM Target Recognition and Attack Multisensor trap A successful, arrested landing aboard an aircraft carrier. trim To balance an aircraft in flight by adjusting the control surfaces and setting tabs to keep them in fixed