An air turbine starter for starting an engine , comprising: a housing defining an inlet , an outlet , and a flow path extending between the inlet and the outlet for communicating a flow of gas there through; a turbine member journaled within the housing and disposed within the flow path for rotatably extracting mechanical power from the flow of gas; a gear train drivingly coupled with the turbine member ; a drive shaft operably coupled with the gear train and having ramped teeth on its output end ; and a decoupler , comprising: an output shaft having a first end with mating ramped teeth that are selectively operably coupled to the drive shaft and a second end configured to be operably coupled to and rotate with the engine , the ramped teeth allow for driving torque transfer from the drive shaft to the output shaft and the ramped teeth slide on each other when back driving torque is transmitted such that the output shaft is moved away from the drive shaft ; a connector having a body with a first end coupled to the output shaft and a second end ; and a magnetic coupling selectively linking the second end of the connector to the drive shaft , when driving torque is transmitted the connector is magnetically linked to the drive shaft via the magnetic coupling and when back driving torque is transmitted the connector is moved away from at least a portion of the magnetic coupling . a housing defining an inlet , an outlet , and a flow path extending between the inlet and the outlet for communicating a flow of gas there through; a turbine member journaled within the housing and disposed within the flow path for rotatably extracting mechanical power from the flow of gas; a gear train drivingly coupled with the turbine member ; a drive shaft operably coupled with the gear train and having ramped teeth on its output end ; and a decoupler , comprising: an output shaft having a first end with mating ramped teeth that are selectively operably coupled to the drive shaft and a second end configured to be operably coupled to and rotate with the engine , the ramped teeth allow for driving torque transfer from the drive shaft to the output shaft and the ramped teeth slide on each other when back driving torque is transmitted such that the output shaft is moved away from the drive shaft ; a connector having a body with a first end coupled to the output shaft and a second end ; and a magnetic coupling selectively linking the second end of the connector to the drive shaft , when driving torque is transmitted the connector is magnetically linked to the drive shaft via the magnetic coupling and when back driving torque is transmitted the connector is moved away from at least a portion of the magnetic coupling . an output shaft having a first end with mating ramped teeth that are selectively operably coupled to the drive shaft and a second end configured to be operably coupled to and rotate with the engine , the ramped teeth allow for driving torque transfer from the drive shaft to the output shaft and the ramped teeth slide on each other when back driving torque is transmitted such that the output shaft is moved away from the drive shaft ; a connector having a body with a first end coupled to the output shaft and a second end ; and a magnetic coupling selectively linking the second end of the connector to the drive shaft , when driving torque is transmitted the connector is magnetically linked to the drive shaft via the magnetic coupling and when back driving torque is transmitted the connector is moved away from at least a portion of the magnetic coupling . <EOS>