обчислювач висот точок опорної мережі
vertical сontrol operator
instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)
air traffic control operator
control tower operator
operator control unit (OCU)
control post operator
fire-control operator
dual operator control
aircraft control and warning operator
vertical control
early warning system (EWS) operator
identification operator
operator maintenance
operator’s pack
operator's permit
ship operator
telephone operator
radio telephone operator (RTO)
aiming rule operator
azimuth (deflection) display board operator
navigator-radio operator
air operator certificate
aircraft operator
airport operator
flight operator
flight radio operator
flight systems operator
operator D / Dt
operator communication
radar operator
traffic operator
operator