third-speed gear

third country national (TCN)

third-party logistics (services support) (TPLSS / 3PL)

3PL (third-party logistics)

captain third rank

one-third octave band system

third-party accident

third order intermodulation

third-class road

third echelon maintenance

A third party preset source is selected

supersonic speed (exceeds speed of sound / Mach 1)

variable-speed with speed control

instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)

Nr gauge (Nr = speed of rotation) / rotor speed sensor

Motor PWM speed separated from PID speed

gear speed decreaser

idler direct speed gear

direct speed gear

fourth and fifth speed gear synchronizer

landing gear placard speed

camshaft gear (timing gear)

gear reduction unit / gear-reduction unit

apparent speed

average speed

blade speed

convoy speed

critical speed

cross-country speed

endurance speed

exhaust speed

full speed (naut.)

group transit speed