Integrated variable area fan nozzle and thrust reversal actuation system and method of operating movable structures of a nacelle

An integrated variable area fan nozzle (VAFN) and thrust reversing actuation system (TRAS) system (15) includes movable surfaces (46) for adjusting an exit area (48) for bypass flow and cowls (52) moved for directing discharge flow in a reverser manner. The movable surfaces of the VAFN and TRAS systems are both coupled for movement by a common actuator arrangement. A power drive unit (68) drives each of the actuators (56A-B,53A-B;96A-B,98A-B) through a gearbox (64A-B,66A-B;112) or other linkage such that one common motor (72) or motor combination is utilized for driving all of the actuators. A series of redundant and separately actuateable locks (84A-B,86A-B;108,110) control deployment of the surfaces of the thrust reverse system (50) such that thrust reversing system (50) can move to an open or deployed position only in response to each of the locks being actuated to an unlocked condition.