A nacelle assembly comprising: a thrust reverser moveable between a stowed position and a deployed position; a variable area fan nozzle; a first motor operable to move the thrust reverser between the stowed position and the deployed position; a second motor operable to move the variable area fan nozzle relative to the thrust reverser; a drive shaft including a first portion coupled to the second motor and a second portion coupled to the variable area fan nozzle; a clutch mechanism that couples the first portion of the drive shaft and the second portion of the drive shaft when the thrust reverser is in the stowed position to allow movement of the variable area fan nozzle relative to the thrust reverser, and decouples the first portion of the drive shaft from the second portion of the drive shaft when the thrust reverser is in the deployed position; the clutch mechanism including a first feature connected to the first portion of the drive shaft and a second feature connected to the second portion of the drive shaft, the first feature having a first shape and the second feature having a second shape, the first shape engaging the second shape when the drive shaft is coupled, one of the first feature and second feature movable along a longitudinal axis of the drive shaft to engage and disengage from the other of the first and second feature; a compression spring disposed in an opening of the drive shaft, to compensate for any overstow compression; the nacelle assembly being characterised in that it further comprises brakes operable to limit rotation of the second portion of the drive shaft when the drive shaft is decoupled; and a control configured to: send a first signal to the first motor to move the thrust reverser to the deployed position and to disengage the clutch mechanism and send a second signal to the brakes to prevent movement of the variable area fan nozzle relative to the thrust reverser when the drive shaft is decoupled; and send a third signal to the first motor to move the thrust reverser to the stowed position and to engage the clutch mechanism and a fourth signal to the brakes to allow an amount of movement of the variable area fan nozzle relative to the thrust reverser while the drive shaft is coupled. a thrust reverser moveable between a stowed position and a deployed position; a variable area fan nozzle; a first motor operable to move the thrust reverser between the stowed position and the deployed position; a second motor operable to move the variable area fan nozzle relative to the thrust reverser; a drive shaft including a first portion coupled to the second motor and a second portion coupled to the variable area fan nozzle; a clutch mechanism that couples the first portion of the drive shaft and the second portion of the drive shaft when the thrust reverser is in the stowed position to allow movement of the variable area fan nozzle relative to the thrust reverser, and decouples the first portion of the drive shaft from the second portion of the drive shaft when the thrust reverser is in the deployed position; the clutch mechanism including a first feature connected to the first portion of the drive shaft and a second feature connected to the second portion of the drive shaft, the first feature having a first shape and the second feature having a second shape, the first shape engaging the second shape when the drive shaft is coupled, one of the first feature and second feature movable along a longitudinal axis of the drive shaft to engage and disengage from the other of the first and second feature; a compression spring disposed in an opening of the drive shaft, to compensate for any overstow compression; the nacelle assembly being characterised in that it further comprises brakes operable to limit rotation of the second portion of the drive shaft when the drive shaft is decoupled; and a control configured to: send a first signal to the first motor to move the thrust reverser to the deployed position and to disengage the clutch mechanism and send a second signal to the brakes to prevent movement of the variable area fan nozzle relative to the thrust reverser when the drive shaft is decoupled; and send a third signal to the first motor to move the thrust reverser to the stowed position and to engage the clutch mechanism and a fourth signal to the brakes to allow an amount of movement of the variable area fan nozzle relative to the thrust reverser while the drive shaft is coupled. send a first signal to the first motor to move the thrust reverser to the deployed position and to disengage the clutch mechanism and send a second signal to the brakes to prevent movement of the variable area fan nozzle relative to the thrust reverser when the drive shaft is decoupled; and send a third signal to the first motor to move the thrust reverser to the stowed position and to engage the clutch mechanism and a fourth signal to the brakes to allow an amount of movement of the variable area fan nozzle relative to the thrust reverser while the drive shaft is coupled.