rotor (system) gear box

main gear box / main rotor transmission

main rotor transmission / main gear box

tail rotor gear box

lateral dual rotor system / side-by-side rotor helicopter

main-rotor head / main-rotor hub

main-rotor hub / main-rotor head

rotor gear pump

gearbox / gear box

aircraft accessory gear box

engine accessory gear box

intermediate gear box

intermediate reduction gear box

main gear box oil temperature indicator

transmission / gear box

camshaft gear (timing gear)

gear reduction unit / gear-reduction unit

rotor system

lateral dual rotor system

tandem-rotor system

fire extinguishing system sprinkler system and fire alarm system

brake rotor

tail rotor blade

tilt rotor aircraft

turbine disc / rotor /wheel

idle rotor

inner rotor

aft main rotor

main rotor brake

rotor support damper

coaxial-rotor helicopter

single-rotor helicopter

tandem-rotor helicopter