There is provided a latch mechanism (200) for joining two portions (110, 120) of a gas turbine engine, the latch mechanism being moveable between an open and a closed position. The latch mechanism comprises a first member (210) configured to be attachable to a first portion (110) of a gas turbine engine; a second member (220) pivotally attached to the first member (210), wherein the first member (210) is attached to the second member (220) at a first position (221); a handle (240) pivotally attached to the second member (220), wherein the handle (240) is attached to the second member (220) at a second position (222); and a third member (230) pivotally attached to the second member (220). The third member (230) is attached to the second member (220) at a third position (223), the third position (223) being between the first position (221) and the second position (222), and wherein the third member (230) comprises securing means (231) for securing the third member (230) to a second portion (120) of a gas turbine engine. The latch mechanism further comprises a locking device comprising retaining means (251) configured to retain the latch mechanism (200) in its closed position.