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One or more particle arrestors are mounted in a curved radial flow portion of a gas turbine starter annular flow passage, between a fluid inlet and a fluid outlet. The one or more arrestor rings block line of sight paths between the turbine wheel and the annular flow passage outlet. Thus, the one or

One or more particle arrestors are mounted in a curved radial flow portion of a gas turbine starter annular flow passage, between a fluid inlet and a fluid outlet. The one or more arrestor rings block line of sight paths between the turbine wheel and the annular flow passage outlet. Thus, the one or more arrestor rings substantially inhibit relatively high energy particles from exiting the turbine housing, thus substantially inhibiting collateral damage to surrounding equipment and structure.

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1. A particle arrestor for an air turbine starter having a fluid flow passage with a curved radial flow portion proximate to a turbine with blades mounted inside the air turbine starter, the particle arrestor comprising:a main body having an inner peripheral edge and an outer peripheral edge and a w

1. A particle arrestor for an air turbine starter having a fluid flow passage with a curved radial flow portion proximate to a turbine with blades mounted inside the air turbine starter, the particle arrestor comprising:a main body having an inner peripheral edge and an outer peripheral edge and a wall therebetween sized for mounting within the curved radial flow portion of the air turbine starter. 2. The particle arrestor of claim 1, wherein the main body of the particle arrestor is dimensioned so as to extend substantially along an entire length of the curved radial flow portion, extending away from a position proximate to the turbine blades, when installed in the air turbine starter. 3. The particle arrestor of claim 1, wherein the main body of the particle arrestor has at least two flange members formed therein, each flange member having a substantially flat portion. 4. The particle arrestor of claim 3, wherein each flange member has an opening extending therethrough for receiving fasteners. 5. The particle arrestor of claim 1, wherein the main body is ring shaped and the inner peripheral edge and the outer peripheral edge each define an opening. 6. The particle arrestor of claim 1, wherein the main body of the particle arrestor has a generally tapered shape. 7. A particle arrestor for an air turbine starter having a fluid flow passage with a curved radial flow portion proximate to a turbine with blades mounted for rotation inside the air turbine starter, the particle arrestor comprising:a ring-shaped main body having an inner peripheral edge and an outer peripheral edge and a wall therebetween sized for mounting within the curved radial flow portion of the air turbine starter;and wherein the inner peripheral edge of the main body and the outer peripheral edge of the main body each define a generally circular opening. 8. The particle arrestor of claim 7, wherein the main body of the particle arrestor is dimensioned so as to extend substantially along an entire length of the curved radial flow portion, extending away from a position proximate to the turbine blades, when installed in the air turbine starter. 9. The particle arrestor of claim 7, wherein the main body of the particle arrestor has at least two flange members formed therein, each flange member having a substantially flat portion. 10. The particle arrestor of claim 9, wherein each flange member has an opening extending therethrough for receiving fasteners. 11. The turbine of claim 7, wherein each of the particle arrestor rings blocks a line of sight path between the turbine wheel and the flow passage outlet port. 12. A particle arrestor for an air turbine starter having an annular fluid flow passage extending from a fluid inlet port through a substantially axial flow portion and then through a substantially curved radial flow portion to a fluid outlet port, and having a turbine wheel rotationally mounted within the air turbine starter and having at least two turbine blades extending radially into the axial flow portion, the particle arrestor comprising:a ring-shaped main body portion having an inner peripheral edge and an outer peripheral edge for mounting within the curved radial flow portion of the air turbine starter proximate to the turbine wheel, the main body having a generally tapered shape and having a substantially curved cross section extending between the inner peripheral edge and the outer peripheral edge of the main body. 13. The particle arrestor ring of claim 12, wherein the main body of the particle arrestor is dimensioned so as to extend substantially along the entire length of the curved radial flow portion of the air turbine starter, from proximate to the turbine blades to proximate the fluid outlet port, when installed in the turbine housing. 14. The particle arrestor of claim 12, wherein the main body of the particle arrestor wall has at least two flange members formed therein, each flange member having a substantially flat portion. 15. The particle arrestor of claim 14, wherein each flange portion has an opening extending therethrough for receiving fasteners. 16. The turbine of claim 12, wherein each particle arrestor ring main body portion has at least two flange members formed therein, each flange member having a substantially flat portion.