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A cover plate for use in a cabin air compressor is a generally cylindrical body with 19 holes extending through the body and an inner bore defining an inner diameter centered on a center axis. The body has a thickness in a dimension measured perpendicular to the central axis. The inner diameter is 1

A cover plate for use in a cabin air compressor is a generally cylindrical body with 19 holes extending through the body and an inner bore defining an inner diameter centered on a center axis. The body has a thickness in a dimension measured perpendicular to the central axis. The inner diameter is 14.840 inches (37.693 centimeters) plus/minus .005 inch (0.013 centimeter). A diffusor housing, a cabin air compressor and a method of replacing a cover plate are also disclosed.

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1. A cover plate for use in a cabin air compressor comprising: a generally cylindrical body with 19 holes extending through said body, and an inner bore defining an inner diameter centered on a center axis, said body having a thickness in a dimension measured perpendicular to said central axis; ands

1. A cover plate for use in a cabin air compressor comprising: a generally cylindrical body with 19 holes extending through said body, and an inner bore defining an inner diameter centered on a center axis, said body having a thickness in a dimension measured perpendicular to said central axis; andsaid inner diameter is 14.840 inches (37.693 centimeters) plus/minus .005 inch (0.013 centimeter). 2. The cover plate as set forth in claim 1, wherein said body is formed of corrosion resistant steel. 3. The cover plate as set forth in claim 2, wherein said body having a thickness in a dimension measured perpendicular to said central axis, and a ratio of said inner diameter to said thickness being between 592.8 and 593.2. 4. The cover plate as set forth in claim 3, wherein said thickness is 0.025 inch (0.0635 centimeter) plus/minus 0.001 inch (0.00254 centimeter). 5. The cover plate as set forth in claim 1, wherein said body having a thickness in a dimension measured perpendicular to said central axis, and a ratio of said inner diameter to said thickness being between 592.8 and 593.2. 6. The cover plate as set forth in claim 5, wherein said thickness is 0.025 inch (0.0635 centimeter) plus/minus 0.001 inch (0.00254 centimeter). 7. A diffuser assembly for use in a cabin air compressor comprising: a diffuser housing having a forward face including a circumferential groove and a plurality of slots formed through a thickness of said diffuser housing in said groove, said diffuser housing having a plurality of static pins;a plurality of vanes mounted on said static pins;a drive ring, said drive ring having moving pins extending through said slots and into openings in said plurality of vanes;an actuator for causing said drive ring to rotate, with said moving pins moving within said slots in said diffuser housing to adjust said plurality of vanes; anda cover plate mounted in said circumferential groove, said cover plate having 19 holes, and said moving pins extending through said holes and into said openings in said plurality of vanes, and said cover plate being cylindrical and having an inner bore defining an inner diameter, and said inner diameter is 14.840 inches (37.693 centimeters) plus/minus .005 inch (0.013 centimeter). 8. The diffuser assembly as set forth in claim 7, wherein said cover plate is formed of corrosion resistant steel. 9. The diffuser assembly as set forth in claim 8, wherein said cover plate having a thickness in a dimension measured perpendicular to said central axis, and a ratio of said inner diameter to said thickness being between 592.8 and 593.2. 10. The diffuser assembly as set forth in claim 9, wherein said thickness is 0.025 inch (0.0635 centimeter) plus/minus 0.001 inch (0.00254 centimeter). 11. The diffuser assembly as set forth in claim 7, wherein said cover plate having a thickness in a dimension measured perpendicular to said central axis, and a ratio of said inner diameter to said thickness being between 592.8 and 593.2. 12. The diffuser assembly as set forth in claim 11, wherein said thickness is 0.025 inch (0.0635 centimeter) plus/minus 0.001 inch (0.00254 centimeter). 13. A cabin air compressor comprising: an electric motor for rotation about a central axis, said electric motor driving a shaft to, in turn, drive a compressor impeller, said compressor impeller rotating within a diffuser housing, said diffuser housing having a forward face including a circumferential groove and a plurality of slots formed through a thickness of said diffuser housing in said groove, said diffuser housing having a plurality of static pins;a plurality of vanes mounted on said static pins;a drive ring, said drive ring having moving pins extending through said slots and into openings in said plurality of vanes;an actuator for causing said drive ring to rotate, with said moving pins moving within said slots in said diffuser housing to adjust said plurality of vanes; anda cover plate mounted in said circumferential groove, said cover plate having 19 holes, and said moving pins extending through said holes and into said openings in said plurality of vanes, and said cover plate being cylindrical and having an inner bore defining an inner diameter, and said inner diameter is 14.840 inches (37.693 centimeters) plus/minus .005 inch (0.013 centimeter). 14. The cabin air compressor as set forth in claim 13, wherein said cover plate is formed of corrosion resistant steel. 15. The cabin air compressor as set forth in claim 14, wherein said cover plate having a thickness in a dimension measured perpendicular to said central axis, and a ratio of said inner diameter to said thickness being between 592.8 and 593.2. 16. The cabin air compressor as set forth in claim 15, wherein said thickness is 0.025 inch (0.0635 centimeter) plus/minus 0.001 inch (0.00254 centimeter). 17. The cabin air compressor as set forth in claim 13, wherein said cover plate having a thickness in a dimension measured perpendicular to said central axis, and a ratio of said inner diameter to said thickness being between 592.8 and 593.2. 18. The cabin air compressor as set forth in claim 17, wherein said thickness is 0.025 inch (0.0635 centimeter) plus/minus 0.001 inch (0.00254 centimeter). 19. A method of replacing a cover plate comprising the steps of: removing a cover plate from a diffuser assembly which includes a diffuser housing having a forward face including a circumferential groove and a plurality of slots formed through a thickness of said diffuser housing in said groove, said diffuser housing having a plurality of static pins, a plurality of vanes being mounted on said static pins, a drive ring having rotating pins extending through said slots and into openings in said plurality of vanes, an actuator for causing said drive ring to rotate, with said moving pins moving within said slots in said diffuser housing to adjust said plurality of vanes, the cover plate being previously mounted in said circumferential groove; andthen replacing said removed cover plate with a new cover plate having 19 holes, and said moving pins extending through said holes and into said openings in said diffuser vanes, and said new cover plate being cylindrical and defining an inner diameter, and said inner diameter is 14.840 inches (37.693 centimeters) plus/minus .005 inch (0.013 centimeter). 20. The method as set forth in claim 19, wherein said cover plate is formed of a corrosion resistant steel, and having a thickness defined perpendicular to a central axis of said cover plate, with a ratio of said inner diameter to said thickness being between 592.8 and 593.2.