direct speed gear

idler direct speed gear

direct drive gear

supersonic speed (exceeds speed of sound / Mach 1)

variable-speed with speed control

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

cruise speed / cruising speed

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

gear speed decreaser

fourth and fifth speed gear synchronizer

landing gear placard speed

third-speed gear

camshaft gear (timing gear)

gear reduction unit / gear-reduction unit

alternating current-direct current (AC-DC) converter

direct action (DA)

direct approach

direct approaches

direct commercial sales (DCS)

direct current

direct damage assessment

direct effect of blast wave

direct exchange (DX) (logistics)

direct fire range

direct fire support

direct fire weapon

direct force

direct hit

direct laying fire

direct laying position

direct liaison authority (DIRLAUTH)

direct maintenance support

direct military threat