System and method for limiting movement of a retaining ring

1. A method, comprising:

installing a blade outer air seal (“BOAS”) support into a case before installation of a retaining ring assembly;

installing a key system on a retaining ring to create the retaining ring assembly;

installing the retaining ring assembly in the case;

rotating the retaining ring assembly in the case until the key system is aligned with a case slot; and

tightening the key system to the retaining ring and cause the key system to engage the case slot.

2. The method of claim 1 , wherein the key system comprises a key washer.

3. The method of claim 1 , wherein the BOAS support comprises a support tab.

4. The method of claim 3 , wherein the retaining ring comprises a support.

5. The method of claim 4 , wherein the support of the retaining ring is aligned with the support tab in response to the sliding of the retaining ring.

6. The method of claim 5 , wherein the support tab is configured to restrain radial motion of the retaining ring assembly.

7. The method of claim 2 , wherein the key washer has a shape that corresponds to the case slot.

8. The method of claim 2 , wherein the key system further comprises a fastener and a nut.

9. The method of claim 8 , wherein the key washer has a shape that corresponds to the case slot.

10. The method of claim 9 , wherein the fastener mounts flush in a first side of the retaining ring and protrudes through second side of the retaining ring to engage the key washer and receive the nut.

11. The method of claim 8 , wherein the fastener is installable through the retaining ring to mount the key washer to the retaining ring.

12. The method of claim 11 , wherein the engagement of the case slot is configured to restrain circumferential motion of the retaining ring assembly.