Dual pin support for blade outer air seal and method

A dual pin loaded blade outer air seal (BOAS), comprising:

• a ceramic matrix composite (CMC) BOAS base having a first end and a second end;
• a pair of CMC BOAS rails extending transversely from the CMC BOAS base, the CMC BOAS rails being substantially parallel and extending from the first end to the second end, with each CMC BOAS rail having a first pair of holes adjacent the first end and a second pair of holes adjacent the second end;
• a first metallic rotatable support engaging each of the first pair of holes;
• and
• a second metallic rotatable support engaging each of the second pair of holes, wherein each of the first and second rotatable metallic supports includes:
• a first central support pin and a second central support pin disposed on a first axis, the first and second central support pins configured to rotate about the first axis when engaged within respective holes on a support;
• a pair of parallel pins having a first end connected to the first central support pin and a second end connected to the second central support pin, respectively, wherein the pair of parallel pins are configured to engage a respective pair of holes in each CMC BOAS rail.

A method of supporting a ceramic matric composite (CMC) blade outer air seal (BOAS), the CMC BOAS having a substantially π-shaped cross-section with a base and a pair of rails, the method comprising:

• providing an aligned pair of holes in first and second ends of the rails, the aligned pairs of holes being disposed outside of an intermediate temperature zone adjacent the base;
• providing a first pair of parallel metallic pins extending through the aligned pair of holes in the first end of the rails;
• providing a second pair of parallel metallic pins extending through the aligned pair of holes in the second end of the rails;
• supporting the first and second ends of the first pair of parallel metallic pins with axially-aligned first central support pins;
• and
• supporting the first and second ends of the second pair of parallel metallic pins with axially-aligned second central support pins,
• wherein the axially-aligned first and second central support pins are disposed parallel to each other and are configured to permit rotation of the first and second pairs of parallel metallic pins in response to thermal bending of the CMC BOAS.