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Air Turbine Starter (ATS) systems are provided, as gas turbine engines including ATS systems. In one embodiment, a gas turbine engine includes an accessory gearbox (AGB) and an integrated Air Turbine Starter (ATS) system. The AGB includes a gearbox gear train within a gearbox housing. The integrated

Air Turbine Starter (ATS) systems are provided, as gas turbine engines including ATS systems. In one embodiment, a gas turbine engine includes an accessory gearbox (AGB) and an integrated Air Turbine Starter (ATS) system. The AGB includes a gearbox gear train within a gearbox housing. The integrated ATS system is removably installed on the AGB and includes an ATS having an air turbine and an output shaft coupled thereto. An ATS clutch module is coupled to the ATS output shaft. The ATS clutch module is further within the gearbox housing and mechanically couples the ATS output shaft to the gearbox gear train when the integrated ATS system is installed on the AGB.

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1. A gas turbine engine, comprising: an accessory gearbox (AGB), comprising: a gearbox housing; anda gearbox gear train within the gearbox housing;an integrated Air Turbine Starter (ATS) system removably installed on the AGB, the integrated ATS system comprising: an ATS including an air turbine and

1. A gas turbine engine, comprising: an accessory gearbox (AGB), comprising: a gearbox housing; anda gearbox gear train within the gearbox housing;an integrated Air Turbine Starter (ATS) system removably installed on the AGB, the integrated ATS system comprising: an ATS including an air turbine and an ATS output shaft coupled thereto, the ATS output shaft having a mating end portion received in the gearbox housing when the integrated ATS system is installed on the AGB; andan ATS clutch module coupled to the ATS output shaft, the ATS clutch module received within the gearbox housing and mechanically coupling the ATS output shaft to the gearbox gear train when the integrated ATS system is installed on the AGB, the ATS clutch module comprising: a plurality of unidirectional clutch elements distributed around a rotational axis of the ATS clutch module; anda central opening configured to receive the mating end portion of the output shaft, the mating end portion of the output shaft engaging the plurality of unidirectional clutch elements when inserted into the central opening; an oil recirculation system fluidly coupled to the AGB, the oil recirculation system having an oil outlet positioned to direct a jet of oil into an open side of the ATS clutch module and onto the mating end portion of the ATS output shaft during operation of the gas turbine engine. 2. The gas turbine engine of claim 1 wherein the ATS clutch module comprises: a first race formed on the mating end portion of the ATS output shaft;a second race co-axial with the first race; anda plurality of unidirectional clutch elements captured between the first and second races. 3. The gas turbine engine of claim 2 wherein the ATS clutch module further comprises a splined ring on which the second race is formed. 4. The gas turbine engine of claim 3 wherein the gearbox gear train comprises: an input gear; anda splined interface coupled to the input gear and engaging the splined ring to provide a rotationally fixed coupling when the integrated ATS is installed on the AGB. 5. The gas turbine engine of claim 4 wherein the input gear has a central opening into which the ATS clutch module and the mating end portion of the ATS output shaft are inserted when the integrated ATS is installed on the AGB. 6. The gas turbine engine of claim 5 wherein the splined interface is formed on an inner circumferential surface of the input gear around the central opening, wherein the first race is an inner race, and wherein the second race is an outer race. 7. The gas turbine engine of claim 1 wherein the mating end portion of the output shaft is removable from the ATS clutch module without disassembly thereof. 8. The gas turbine engine of claim 1 wherein the ATS further comprises a decoupler mechanism integrated into the ATS output shaft and limiting the rate of rotation between the air turbine and the ATS clutch module in at least one rotational direction. 9. The gas turbine engine of claim 8 wherein the air turbine is fixedly coupled to the output shaft such that that the ratio of rotation between the air turbine and the output shaft is 1:1. 10. The gas turbine engine of claim 1 the ATS clutch module is configured to rotationally disengage the ATS from the gearbox gear train after main engine start of the gas turbine engine. 11. An integrated Air Turbine Starter (ATS) system for usage in conjunction with an accessory gearbox (AGB) having a gearbox housing containing a gearbox gear train, the integrated ATS system comprising: an ATS comprising: an air turbine; andan ATS output shaft coupled to the air turbine, the ATS output shaft having a mating end portion received in the gearbox housing when the integrated ATS system is installed on the AGB; and an ATS clutch module coupled to the ATS output shaft, the ATS clutch module received in the gearbox housing and mechanically coupling the ATS output shaft to the gearbox gear train when the integrated ATS system is installed on the AGB, the ATS clutch module comprising: a first race formed on a mating end portion of the ATS output shaft;a second race co-axial with the first race; anda plurality of unidirectional clutch elements captured between the first and second races; wherein the mating end portion of the ATS output shaft is imparted with a smooth annular surface, which serves as a race for the ATS clutch module and which can be withdrawn from the ATS clutch module along an insertion/withdrawal axis to disconnect the ATS from the ATS clutch module. 12. The integrated ATS system of claim 11 wherein the ATS module comprises a splined ring member, which circumscribes the plurality of unidirectional clutch elements. 13. The integrated ATS system of claim 11 wherein the ATS clutch module can further be withdrawn from the AGB along the insertion/withdrawal axis to disconnect ATS clutch module from the gearbox gear train. 14. A gas turbine engine, comprising: an accessory gearbox (AGB), comprising: a gearbox housing; anda gearbox gear train within the gearbox housing;an integrated Air Turbine Starter (ATS) system removably installed on the AGB, the integrated ATS system comprising: an ATS including an air turbine and an ATS output shaft coupled thereto, the ATS output shaft having a mating end portion received in the gearbox housing when the integrated ATS system is installed on the AGB; andan ATS clutch module coupled to the ATS output shaft, the ATS clutch module received within the gearbox housing and mechanically coupling the ATS output shaft to the gearbox gear train when the integrated ATS system is installed on the AGB; and wherein the ATS clutch module comprises:a plurality of unidirectional clutch elements distributed around a rotational axis of the ATS clutch module; anda central opening configured to receive the mating end portion of the ATS output shaft, the mating end portion of the ATS output shaft engaging the plurality of unidirectional clutch elements when inserted into the central opening. 15. The gas turbine engine of claim 14 wherein the mating end portion of the ATS output shaft is imparted with a smooth annular surface, which serves as a race for the ATS clutch module and which can be withdrawn from the ATS clutch module along an insertion/withdrawal axis to disconnect the ATS from the ATS clutch module; and wherein the ATS clutch module can further be withdrawn from the AGB along the insertion/withdrawal axis to disconnect ATS clutch module from the gearbox gear train. 16. The gas turbine engine of claim 14 further comprising an oil recirculation system fluidly coupled to the AGB, the oil recirculation system having an oil outlet positioned to direct a jet of oil into an open side of the ATS clutch module when the integrated ATS system is installed on the AGB. 17. The gas turbine engine of claim 14 further comprising: an input gear included in the gearbox gear train; anda splined interface formed between the input gear and the ATS clutch module, the splined interface providing a rotationally fixed coupling between the input gear and the ATS clutch module when the integrated ATS system is installed on the AGB.