An electromechanical actuator comprising: a housing including a first end that extends to a second end through an intermediate portion that defines a longitudinal axis, the housing defining an internal cavity; an electric motor arranged within the internal cavity, the electric motor including a stator and a rotor, the rotor surrounding a shaft having a first shaft end and a second shaft end; a drive member arranged within the housing along the longitudinal axis, the drive member including an input shaft operatively coupled to the first shaft end and an output shaft; an output shaft member coupled to the output shaft of the drive member, the output shaft member extending out from the first end of the housing; and at least one bearing assembly (138;184) supporting one of the output shaft and the first shaft end; characterised in that the electromechanical actuator is an electromechanical rotary actuator; in that the output shaft member is configured and disposed to rotate about the longitudinal axis; and in that the electromechanical rotary actuator further comprises a preload member arranged within the housing and configured to apply a compressive axial force to the at least one bearing (138;184), the drive member and the electric motor, the preload member accommodating thermal expansion of the electromechanical rotary actuator along the longitudinal axis and a resolver operatively coupled to the one of the input shaft and the output shaft of the drive member; wherein the at least one bearing assembly includes a first bearing assembly supporting the first shaft end and a second bearing assembly supporting the output shaft member, and an end bearing assembly arranged to support the second shaft end, the first and second bearing assemblies (138,184) being subjected to the compressive axial force. a housing including a first end that extends to a second end through an intermediate portion that defines a longitudinal axis, the housing defining an internal cavity; an electric motor arranged within the internal cavity, the electric motor including a stator and a rotor, the rotor surrounding a shaft having a first shaft end and a second shaft end; a drive member arranged within the housing along the longitudinal axis, the drive member including an input shaft operatively coupled to the first shaft end and an output shaft; an output shaft member coupled to the output shaft of the drive member, the output shaft member extending out from the first end of the housing; and at least one bearing assembly (138;184) supporting one of the output shaft and the first shaft end; characterised in that the electromechanical actuator is an electromechanical rotary actuator; in that the output shaft member is configured and disposed to rotate about the longitudinal axis; and in that the electromechanical rotary actuator further comprises a preload member arranged within the housing and configured to apply a compressive axial force to the at least one bearing (138;184), the drive member and the electric motor, the preload member accommodating thermal expansion of the electromechanical rotary actuator along the longitudinal axis and a resolver operatively coupled to the one of the input shaft and the output shaft of the drive member; wherein the at least one bearing assembly includes a first bearing assembly supporting the first shaft end and a second bearing assembly supporting the output shaft member, and an end bearing assembly arranged to support the second shaft end, the first and second bearing assemblies (138,184) being subjected to the compressive axial force.