Air turbine starter with decoupler

An air turbine starter for starting an engine, the air turbine starter comprising:

• a housing with an air flow path extending between an inlet and an outlet;
• a turbine member located within the housing and having a turbine shaft and a plurality of blades extending from the turbine shaft, with at least a portion of the plurality of blades extending into the air flow path;
• a drive shaft assembly operably coupled to the turbine member, and having an interior portion;
• a hollow shaft disposed within the interior portion extending between a closed end and an open end with a female threaded portion defining a threaded interior;
• an output shaft extending between a first end and a second end, the output shaft movable between a first position, where the first end is coupled to the engine, and a second position, where the second end is disposed within the interior portion and the first end is uncoupled from the engine and wherein the output shaft comprises a male threaded portion and the male threaded portion and the female threaded portion form a threaded connection;
• and
• a decoupler assembly comprising a retainer connecting the drive shaft assembly to the output shaft, when the output shaft is in the first position, and disconnecting the drive shaft assembly from the output shaft, when a driving torque transmitted from the drive shaft assembly to the output shaft loads the retainer over a torque limit causing the output shaft to move into the second position.