An actuator system, comprising: a pressure actuator having a piston, at least a first port and second port, wherein the first port is on a first pressure side of the piston and the second port is on a second pressure side of the piston; and a first valve and a second valve in selective fluid communication with the first port and the second port of the pressure actuator via at least one first port line and at least one second port line, wherein each of the first and second valve (109, 111) has a first open state, a second open state, and a closed state such that the first open state allows a pressure differential between the first port and the second port such that the actuator is biased to an extended position when one of the first and second valves is in fluid communication with the actuator and in the first open state, wherein the second open state allows a pressure differential between the first port and the second port such that the actuator is biased to a retracted position when one of the first and second valves is in fluid communication with the actuator and in the second open state, the actuator system further comprising a selection valve in fluid communication between the actuator and the first and second valves (109, 111), wherein the selection valve is configured to move between at least a first selection state to select the first valve to fluidly communicate with the actuator and a second selection state to select the second valve to fluidly communicate with the actuator, characterised in that: the first valve includes a first null state in the event of a failure of the first valve such that first null state allows a pressure differential between the first port and the second port such that the actuator is biased to a first direction when the first valve is in fluid communication with the actuator and is in the first null state, and in that the second valve includes a second null state in the event of a failure of the second valve such that second null state allows a pressure differential between the first port and the second port such that the actuator is biased to a second direction when the second valve is in fluid communication with the actuator and is in the second null state. a pressure actuator having a piston, at least a first port and second port, wherein the first port is on a first pressure side of the piston and the second port is on a second pressure side of the piston; and a first valve and a second valve in selective fluid communication with the first port and the second port of the pressure actuator via at least one first port line and at least one second port line, wherein each of the first and second valve (109, 111) has a first open state, a second open state, and a closed state such that the first open state allows a pressure differential between the first port and the second port such that the actuator is biased to an extended position when one of the first and second valves is in fluid communication with the actuator and in the first open state, wherein the second open state allows a pressure differential between the first port and the second port such that the actuator is biased to a retracted position when one of the first and second valves is in fluid communication with the actuator and in the second open state, the actuator system further comprising a selection valve in fluid communication between the actuator and the first and second valves (109, 111), wherein the selection valve is configured to move between at least a first selection state to select the first valve to fluidly communicate with the actuator and a second selection state to select the second valve to fluidly communicate with the actuator, characterised in that: the first valve includes a first null state in the event of a failure of the first valve such that first null state allows a pressure differential between the first port and the second port such that the actuator is biased to a first direction when the first valve is in fluid communication with the actuator and is in the first null state, and in that the second valve includes a second null state in the event of a failure of the second valve such that second null state allows a pressure differential between the first port and the second port such that the actuator is biased to a second direction when the second valve is in fluid communication with the actuator and is in the second null state.