основні площини керування
clipped-delta tail-control surfaces
secondary control surfaces
flight control surfaces
outer surfaces
primary control surface
gunner's primary sight (GPS)
officer of primary responsibility
primary (fire) position
primary arm
primary armament
primary burn
primary sector of fire
primary high explosive
primary military occupational specialty (MOS)
primary mission
primary reserve
primary target
primary target line (PTL)
primary trainer
primary weapon
primary position
primary, alternate, contingency, emergency (PACE)
primary level training (PLT)
primary venturi
primary defect
primary cause
primary great circle spherical coordinate system
primary rainbow
primary runway
primary VHF radio
primary failure
integration of primary and secondary radar data