26.

As shown in FIGS. 3 and 4, the first attachment flange 50 defines an axially-forward facing surface 54 facing toward the fourth flange 42 of the carrier segment 26 and an axially-aft facing surface 56 facing toward the second flange 38 of the carrier segment 26. The first attachment flange 50 is formed to define a first recess 58. The first recess 58 extends axially forward into the first attachment flange 50 from the axially-aft facing surface 56 toward the axially-forward facing surface 54 thereof. As shown in FIGS. 4 and 6, the first recess 58 is formed at a first circumferential end 50A of the first attachment flange 50. In this way, the first recess 58 is open at the first circumferential end 50A of the first attachment flange 50. The first recess 58 is also formed at a radial outer edge 50B of the first attachment flange 50. In this way, the first recess 58 is open at the first circumferential end 50A and at the radial outer edge 50B of the first attachment flange 50.

The first recess 58 is defined by an engagement surface 59, a first wall 61, and a second wall 63, as shown in FIGS. 4 and 6. The engagement surface 59 is spaced apart axially forward from the axially-aft facing surface 56 of the first attachment flange 50. In some embodiments, the engagement surface 59 is substantially parallel to the axially-aft facing surface 56. The engagement surface 59 is illustratively a machined surface.

The first wall 61 and the second wall 63 interconnect the engagement surface 59 and the axially-aft facing surface 56, as shown in FIGS. 4 and 6. In some embodiments, the first wall 61 and the second wall 63 are substantially perpendicular to the engagement surface 59 and the axially-aft facing surface 56. The first wall 61 extends axially forward from the axially-aft facing surface 56 to the engagement surface 59, as shown in FIG. 4. The first wall 61 extends circumferentially along the first attachment flange 50 from the first circumferential end 50A thereof, as shown in FIG. 6. The first wall 61 defines a radial inner boundary of the first recess 58.

The second wall 63 extends axially forward from the axially-aft facing surface 56 to the engagement surface 59, as shown in FIG. 4. The second wall 63 extends radially along the first attachment flange 50 from the radial outer edge 50B thereof to the first wall 61, as shown in FIG. 6. The second wall 63 defines a circumferential boundary of the first recess 58.

In some embodiments, the first wall 61 and the second wall 63 are substantially perpendicular to one another, as shown in FIG. 6. The first wall 61 and the second wall 63 may be curved at ends thereof to form a curved connection between the first wall 61 and the second wall 63.

As shown in FIGS. 6 and 8, the first attachment flange 50 is further formed to define a second recess 60. The second recess 60 is circumferentially spaced apart from the first recess 58. The second recess 60 extends axially forward into the first attachment flange 50 from the axially-aft facing surface 56 toward the axially-forward facing surface 54 thereof. As shown in FIGS. 4 and 6, the second recess 60 is formed at a second circumferential end 50C of the first attachment flange 50 opposite the first circumferential end 50A thereof. In this way, the second recess 60 is open at the second circumferential end 50C of the first attachment flange 50. The second recess 60 is also formed at the radial outer edge 50B of the first attachment flange 50. In this way, the second recess 60 is open at the second circumferential end 50C and at the radial outer edge 50B of the first attachment flange 50.

The second recess 60 is defined by an engagement surface 65, a first wall 67, and a second wall 69, as shown in FIG. 6. The engagement surface 65 is spaced apart axially forward from the axially-aft facing surface 56 of the first attachment flange 50. In some embodiments, the engagement surface 65 is substantially parallel to the axially-aft facing surface 56 and the engagement surface 59. The engagement surface 65 is illustratively a machined surface. The first wall 67 and the second wall 69 interconnect the engagement surface 65 and the axially-aft facing surface 56, as shown in FIG. 6. In some embodiments, the first wall 67 and the second wall 69 are substantially perpendicular to the engagement surface 65 and the axially-aft facing surface 56. The first wall 67 extends axially forward from the axially-aft facing surface 56 to the engagement surface 65. The first wall 67 extends circumferentially along the first attachment flange 50 from the second circumferential end 50C thereof, as shown in FIG. 6. The first wall 67 defines a radial inner boundary of the second recess 60.

The second wall 69 extends axially forward from the axially-aft facing surface 56 to the engagement surface 65, as shown in FIG. 6. The second wall 69 extends radially along the first attachment flange 50 from the radial outer edge 50B thereof to the first wall 67, as shown in FIG. 6. The second wall 69 defines a circumferential boundary of the second recess 60.

In some embodiments, the first wall 67 and the second wall 69 are substantially perpendicular to one another, as shown in FIG. 6. The first wall 67 and the second wall 69 may be curved at ends thereof to form a curved connection between the first wall 67 and the second wall 69.

The mount assembly 30 includes two retainers 62 that are circumferentially spaced apart from one another, as shown in FIGS. 5 and 8. Each retainer 62 includes a mount pin 64 and a pin retention plug 66. Each mount pin 64 extends into the carrier segment 26 and the blade track segment 28 to couple the blade track segment 28 to the carrier segment 26. Each pin retention plug 66 is press fit into the carrier segment 26 axially aft of the respective mount pin 64 and circumferentially aligned with the respective mount pin 64 to block removal of the respective mount pin 64 from the carrier segment 26 and the blade track segment 28 and to block axial movement of the respective mount pin