main rotor transmission / main gear box

main gear box / main rotor transmission

main-rotor head / main-rotor hub

main-rotor hub / main-rotor head

transmission / gear box

rotor (system) gear box

tail rotor gear box

main gear box oil temperature indicator

gear reduction transmission

helical gear transmission

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

main transmission oil temperature gauge

rotor gear pump

gearbox / gear box

aircraft accessory gear box

engine accessory gear box

intermediate gear box

intermediate reduction gear box

aft main rotor

main rotor brake

main rotor hub

blade tip light / main-rotor blade tip light

five-blade main rotor

forward main rotor

main rotor noise

main-rotor (hydraulic) collective pitch actuator

main-rotor axis

main-rotor blade

main-rotor blade durability

main-rotor blade tip light blade tip light

main-rotor brake

main-rotor collective pitch control rod

main-rotor diameter