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A blade outer air seal for use in a gas turbine engine, the BOAS including a plurality of first diffusion and impingement cooling air cavities separated by stiffener ribs, each diffusion and impingement cavity being connected to a cooling air supply cavity through a first metering and impingement ho

A blade outer air seal for use in a gas turbine engine, the BOAS including a plurality of first diffusion and impingement cooling air cavities separated by stiffener ribs, each diffusion and impingement cavity being connected to a cooling air supply cavity through a first metering and impingement hole. Each diffusion and impingement cavity is connected to a plurality of trenched diffusion slots that open onto the surface of the BOAS and form a series of V-shaped slots. A plurality of second metering and impingement holes connect each slot to the respective first diffusion and impingement cavity. The trenched diffusion slots are angularly offset from a normal direction to the BOAS surface, and the second metering and impingement holes are offset at about 90 degrees from the slots so that both diffusion and impingement cooling occurs within the slots. The array of separated diffusion and impingement cavities and metering holes allow for the cooling flows and pressures to be regulated for each area of the BOAS.

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I claim: 1. A blade outer air seal for use in a gas turbine engine, comprising: a trenched diffusion slot extending along and opening onto the BOAS lower surface; a metering hole in fluid communication with a cooling air supply cavity of the BOAS and opening into the trenched diffusion slot, the me

I claim: 1. A blade outer air seal for use in a gas turbine engine, comprising: a trenched diffusion slot extending along and opening onto the BOAS lower surface; a metering hole in fluid communication with a cooling air supply cavity of the BOAS and opening into the trenched diffusion slot, the metering hole being oriented with the trenched diffusion slot such that both diffusion and impingement cooling of the slot occurs; and, the trenched diffusion slot is offset at about a 45 degree angle from a perpendicular direction from the BOAS bottom surface. 2. The blade outer air seal of claim 1, and further comprising: the metering hole and the trenched diffusion slot form around a 90 degree angle with respect to each other. 3. A blade outer air seal for use in a gas turbine engine comprising: a main body segment including a surface on which a TBC is applied; a plurality of stiffener ribs forming a plurality of first diffusion and impingement cavities in the forward and aft direction and in the circumferential direction of the BOAS; a metering plate covering the plurality of first diffusion and impingement cavities; a first metering and impingement hole formed in the metering plate for each of the plurality of first diffusion and impingement cavities, the first metering and impingement holes connecting the cavities to a cooling air supply cavity; each of the first diffusion and impingement cavities connected to a plurality of trenched diffusion slots opening onto the surface of the BOAS through a second metering and impingement hole; and, the trenched diffusion slots are angled with respect to the surface of the BOAS and the second metering and impingement holes are angled with respect to the trenched diffusion slots such that cooling air passing from the cavity and out from the slot is diffused and impinged into the slot. 4. The blade outer air seal of claim 3, and further comprising: a plurality of forward trenched diffusion slots and a plurality of aft trenched diffusion slots having a V-shaped arranged looking from the bottom surface of the BOAS in which the two slots are separated at around the middle of the BOAS surface. 5. The blade outer air seal of claim 4, and further comprising: the V-shaped arrangement of trenched diffusion slots opens in the direction of rotation of the blade tip. 6. The blade outer air seal of claim 5, and further comprising: the forward trenched diffusion slot discharges the cooling air in a direction toward the blade tip rotation, and the aft trenched diffusion slot discharges the cooling air in a direction opposed to the blade tip rotation such that the cooling air discharged from the slots is directed substantially in the direction of the hot gas flow through the BOAS. 7. The blade outer air seal of claim 3, and further comprising: an end rail in the circumferential direction of the BOAS includes a mate face cooling hole in communication with the adjacent diffusion and impingement cavity to discharge cooling air to a mate face of an adjacent BOAS. 8. The blade outer air seal of claim 3, and further comprising: the BOAS includes at least four cavities in the circumferential direction and at least two cavities in the forward to aft direction of the BOAS. 9. A blade outer air seal for use in a gas turbine engine, comprising: a trenched diffusion slot extending along and opening onto the BOAS lower surface, the trenched diffusion slot being angularly offset from a normal direction of the BOAS bottom surface; a metering hole in fluid communication with a cooling air supply cavity of the BOAS and opening into the trenched diffusion slot, the metering hole being oriented with the trenched diffusion slot such that both diffusion and impingement cooling of the slot occurs; a metering plate with a first metering and impingement hole connecting the first diffusion and impingement cavity to the cooling air supply cavity, whereby cooling air from the cooling air supply cavity is metered through the first metering and impingement hole into the first diffusion and impingement cavity to provide impingement cooling to the BOAS, and then the cooling air flows through the metering hole that opens into the trenched diffusion slot and into the trenched diffusion slot to provide further impingement cooling to the BOAS; and, a plurality of trenched diffusion slots arranged substantially parallel to each other, each slot being connected to the first diffusion and impingement cavity through a plurality of metering holes that opens into the trenched diffusion slot. 10. A blade outer air seal for use in a gas turbine engine, comprising: a trenched diffusion slot extending along and opening onto the BOAS lower surface, the trenched diffusion slot being angularly offset from a normal direction of the BOAS bottom surface; a metering hole in fluid communication with a cooling air supply cavity of the BOAS and opening into the trenched diffusion slot, the metering hole being oriented with the trenched diffusion slot such that both diffusion and impingement cooling of the slot occurs; an array of first diffusion and impingement cavities each connected to a metering hole that opens into a trenched diffusion slot; the array of first diffusion and impingement cavities is covered by a metering plate that includes at least one first metering and diffusion hole to connect the cooling air supply cavity to each of the first diffusion and impingement cavities; and, a plurality of trenched diffusion slots arranged substantially parallel to each other, each slot being connected to the first diffusion and impingement cavity through a plurality of the metering holes that open into the trenched diffusion slot, whereby a plurality of slots and metering holes that open into the trenched diffusion slot are connected to each of the diffusion and impingement cavities such that each diffusion and impingement cavity provides cooling air to a plurality of trenched diffusion slots. 11. The blade outer air seal of claim 9 or 10, and further comprising: a forward trenched diffusion slot and an aft trenched diffusion slot having a V-shaped arranged looking from the bottom surface of the BOAS in which the two slots are separated at around the middle of the BOAS surface. 12. The blade outer air seal of claim 11, and further comprising: the V-shaped arrangement of trenched diffusion slots opens in the direction of rotation of the blade tip. 13. The blade outer air seal of claim 12, and further comprising: the forward trenched diffusion slot discharges the cooling air in a direction toward the blade tip rotation, and the aft trenched diffusion slot discharges the cooling air in a direction opposed to the blade tip rotation such that the cooling air discharged from the slots is directed substantially in the direction of the hot gas flow against the BOAS.