Gas turbine engine exhaust nozzle having a noise attenuation device driven by shape memory material actuators

A gas turbine engine exhaust nozzle arrangement for the flow of exhaust gases therethrough between an upstream end and a downstream end thereof comprising a nozzle, a downstream portion and a plurality of tabs, each tab extending in a generally axial direction from the downstream portion of the nozzle wherein the nozzle further comprises an actuation mechanism capable of moving the tabs between a first deployed position, with in the first position the tabs interacting with a gas stream to reduce exhaust noise thereof, and a second non-deployed position, in the second position the tabs being substantially aerodynamically unobtrusive, said tabs being made of a material that upon exposure to an elevated temperature causes the material to assume a position to place said tabs in said first position and to move the tabs to said second respective position upon the absence or reduction of the temperature.