main supply axis
головна вісь постачання (головна артерія постачання - This road was clearly a main supply axis, from port to port; but it was also an axis of main movement for forces.- The Memoirs of Field Marshal Montgomery, 1958)
pitch axis / transverse axis / lateral axis
setting angle of the longitudinal axis with respect to the aircraft axis
main defense area (line) / main defensive position
main gear box / main rotor transmission
main rotor transmission / main gear box
main-rotor head / main-rotor hub