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 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 being subjected to the compressive axial force. <EOS>