Gearbox lubrication

A helicopter tail rotor gearbox comprising:

• a housing;
• an output shaft for connection to a tail rotor rotatably supported in the housing and having an open end therein;
• an input member rotatably supported in the housing;
• gearing providing a power transmitting connection between the input member and the output shaft;
• a pitch control shaft for effecting a change in the pitch of the tail rotor, the pitch control shaft being disposed at least partially within the output shaft, rotatable therewith, and movable relative thereto along the rotational axis of the output shaft;
• an actuating member able to be moved axially within the output shaft, wherein axial movement of the actuating member effects axial movement of the pitch control shaft thereby changing the pitch of the tail rotor, and wherein the actuating member is held against rotation relative to the output shaft;
• and
• a bearing assembly positioned in between the pitch control shaft and the actuating member for permitting relative rotation therebetween;
• wherein the gearbox includes at least one formation for diverting oil, dispersed within the housing in use, towards the open end of the output shaft.