Patent ID: 8061119

Claim:
An actuation mechanism for use in a convertible gas turbine propulsion system, the actuation mechanism comprising: a plenum for receiving pressurized air from the convertible gas turbine propulsion system; a pneumatically powered drive body connected to the plenum to receive pressurized air for axially moving the drive body in a first direction; a cowling comprising: an annular compartment for receiving the pneumatically powered drive body; and a port for receiving pressurized air from the plenum; and a spring system connected to the drive body for axially moving the drive body in a second direction; wherein the pneumatically powered drive body comprises: an elongate main body disposed within the annular compartment; a tail disposed at an aft end of the elongate main body configured for connecting with the spring system; and a leaf spring for retaining the elongate main body within the annular compartment and for sealing the pressurized air within the annular compartment such that pressurized air from the plenum biases the elongate main body in the first direction.