Power transmission arrangement

A power transmission arrangement (20) comprises a first power transmission member (24) connectable to a first main shaft (28) of an engine (10). The arrangement (20) also includes a second power transmission member (26) connectable to a second main shaft (30) of the engine and to a third power transmission member (44). A coupling assembly (36) is provided which has a selectable coupling condition to couple the first power transmission member (24) to the second power transmission member (26) to allow power to be transmitted from the third power transmission member (44) to the first main shaft (28) of the engine via the first power transmission member. The coupling assembly (36) has a decoupling condition to decouple the first power transmission member (24) from the second power transmission member (26) to allow power to be transmitted from the main shaft (30) of the engine to the third power transmission member (44) via the second power transmission member (26).