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A system for selectively supplying air between separate plena of a gas turbine engine includes a gas turbine engine, a door, and a bi-metallic door actuator. The gas turbine engine comprises at least a first plenum and a second plenum, and has an opening between the first plenum and the second plenu

A system for selectively supplying air between separate plena of a gas turbine engine includes a gas turbine engine, a door, and a bi-metallic door actuator. The gas turbine engine comprises at least a first plenum and a second plenum, and has an opening between the first plenum and the second plenum. The is door mounted in the gas turbine engine and is movable between a closed position, in which air is prevented from flowing through the opening, and an open position, in which air may flow though the opening. The bi-metallic door actuator is coupled to the door and is configured to selectively move the door between the closed position and the open position.

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1. A system for selectively supplying air between separate plena of a gas turbine engine, comprising: a gas turbine engine comprising at least a first plenum and a second plenum, and having an opening between the first plenum and the second plenum;a door mounted in the gas turbine engine and movable

1. A system for selectively supplying air between separate plena of a gas turbine engine, comprising: a gas turbine engine comprising at least a first plenum and a second plenum, and having an opening between the first plenum and the second plenum;a door mounted in the gas turbine engine and movable between a closed position, in which air is prevented from flowing through the opening, and an open position, in which air may flow though the opening; anda bi-metallic door actuator coupled to the door and configured to selectively move the door between the closed position and the open position, the bi-metallic door actuator comprising: a first metallic member comprised of a first metallic material, the first metallic material having a first coefficient of thermal expansion, anda second metallic member comprised of a second metallic material, the second metallic material having a second coefficient of thermal expansion that is unequal to the first coefficient of thermal expansion, the second metallic member including a first section and a second section, the first section coupled to the first metallic member, the second section extending away from the first section and coupled to the door. 2. The system of claim 1, wherein the bi-metallic door actuator is configured to as a passive actuator. 3. The system of claim 1, wherein the bi-metallic door actuator is configured as an active actuator. 4. The system of claim 1, wherein: the door includes a leading edge and a trailing edge; andthe system further comprises a position-assisting pilot pivotally mounted on the leading edge, whereby the position-assisting pilot may pivot about the leading edge independent of the door. 5. The system of claim 1, wherein: the door includes a leading edge and a trailing edge; andthe system further comprises a position-assisting pilot pivotally mounted on the trailing edge, whereby the position-assisting pilot may pivot about the trailing edge independent of the door. 6. The system of claim 1, wherein the bi-metallic actuator is configured to selectively modulate the position of the door between the closed position and a full-open position. 7. The system of claim 1, wherein the bi-metallic actuator is configured to selectively move the door only between the closed position and a single open position. 8. A system for supplying turbine cooling air flow, comprising: a turbofan engine including an engine case and a bypass flow passage, the engine case having an inner volume within which at least a gas turbine engine is mounted, the bypass flow passage defined by an outer fan duct and an inner fan duct and configured to direct fan air flow therethrough;a heat exchanger disposed within the inner fan duct and including a heat exchanger first flow passage and a heat exchanger second flow passage, the heat exchanger first flow passage coupled to receive engine air from within the engine case, the heat exchanger second flow passage coupled to selectively receive fan air from the bypass flow passage, the heat exchanger configured to transfer heat between the engine air and the fan air;a door movably mounted in the inner fan duct and movable between a closed position, in which the cooling air will not flow into the heat exchanger second flow passage, and an open position, in which the cooling air may flow into the heat exchanger second flow passage; anda bi-metallic door actuator coupled to the door and configured to selectively move the door between the closed an open positions, the bi-metallic door actuator comprising: a first metallic member comprised of a first metallic material having a first coefficient of thermal expansion, anda second metallic member comprised of a second metallic material having a second coefficient of thermal expansion that is unequal to the first coefficient of thermal expansion, the second metallic member including a first section and a second section, the first section coupled to the first metallic member, the second section extending away from the first section and coupled to the door. 9. The system of claim 8, wherein the bi-metallic door actuator is configured to as a passive actuator. 10. The system of claim 8, wherein the bi-metallic door actuator is configured as an active actuator. 11. The system of claim 8, wherein: the door includes a leading edge and a trailing edge; andthe system further comprises a position-assisting pilot pivotally mounted on the leading edge, whereby the position-assisting pilot may pivot about the leading edge independent of the door. 12. The system of claim 8, wherein: the door includes a leading edge and a trailing edge; andthe system further comprises a position-assisting pilot pivotally mounted on the trailing edge, whereby the position-assisting pilot may pivot about the trailing edge independent of the door. 13. The system of claim 8, wherein the bi-metallic actuator is configured to selectively modulate the position of the door between the closed position and a full-open position. 14. The system of claim 8, wherein the bi-metallic actuator is configured to selectively move the door only between the closed position and a single open position.