Patent ID: 8813607

Claim:
A gearbox comprising: an outer housing including a manual rotation access passage; a manual rotation shaft having at least a portion thereof located within the outer housing, the manual rotation shaft for manually rotating a spool of an engine; a sealing system coupled to the outer housing that includes a flapper valve translatable from a closed position to an open position to allow a rotation tool to pass through the manual rotation access passage and contact the manual rotation shaft and translatable from the open position to the closed position after the rotation tool is removed from the manual rotation access passage to prevent a lubricant from escaping from the outer housing via the manual rotation access passage; and wherein the sealing system includes a valve housing to which the flapper valve is coupled and the valve housing is coupled to the outer housing; wherein the manual rotation shaft is rotatably coupled to the outer housing by a bearing; wherein the lubricant is stored in a lubrication reservoir formed by the outer housing and a first side of the bearing and the sealing system is located between a portion of the outer housing and a second side of the bearing that is opposite the first side.