Abstract: A method of manufacturing a last chance screen for an aircraft engine includes forming an array of holes through a metal sheet with a wire electrode using electrical discharge machining. The array of holes comprises a plurality of holes. Each hole of the plurality of holes comprises a first end and a second end and is surrounded by a wall section such that the last chance screen is defined by the plurality of holes and the plurality of wall sections. The first and second end of each hole are widened by either applying a flow of an abrasive flow medium to the array of holes in two directions or using a conical sinker electrode on either side of the metal sheet. Shaping the first and second end of each hole results in an airfoil-shaped cross-section of each wall section.

Abstract: A heat exchanger core includes a plurality of first medium channels along which a first medium is directed from a first first medium channel end to a second first medium end, and a plurality of second medium channels along which a second medium is directed from a first second medium channel end to a second second medium channel end. The first medium channels and/or the second medium channels are formed to have a first portion having a first cross-sectional shape and one or more second portions having a second, different cross-sectional shape. The channel transitions smoothly from the first to the second cross-sectional shape.

Abstract: A method of forming a degassing system includes the step of forming a bundle of hollow tube membrane members by wrapping hollow tube membrane members to form the bundle at a temperature above 100° F. (38° C.). Another method of forming a degassing system includes the step of the inserting bundle into an outer canister at a temperature above 100° F. (38° C.). A fuel supply system made by these methods is also disclosed.

Abstract: A gas removal system includes an interior baffle with an outside surface having flow channels and a central fluid receiving chamber. A membrane fiber bundle with an inside surface is placed outwardly of the interior baffle. The member fiber bundle is formed of fibers that allow the passage of gas through an outer wall, but resist the passage of fluid with the inside surface of the fiber bundle partially contacting the outside surface of the baffle. The interior baffle and the fiber bundle extend between axial ends. A changed diameter portion is intermediate the axial ends wherein each of the outside surface of the interior baffle and the inside surface of the membrane fiber bundle change in diameter in a first direction and then return in a second direction changing diameter in an opposite radial direction from the first direction, and such that the changed diameter portion is intermediate the axial ends. A fuel system is also disclosed.

Abstract: A method of manufacturing a last chance screen for an aircraft engine includes forming an array of holes through a metal sheet with a wire electrode using electrical discharge machining. The array of holes comprises a plurality of holes. Each hole of the plurality of holes comprises a first end and a second end and is surrounded by a wall section such that the last chance screen is defined by the plurality of holes and the plurality of wall sections. The first and second end of each hole are widened by either applying a flow of an abrasive flow medium to the array of holes in two directions or using a conical sinker electrode on either side of the metal sheet. Shaping the first and second end of each hole results in an airfoil-shaped cross-section of each wall section.

Abstract: A method of forming a degassing system includes the step of forming a bundle of hollow tube membrane members by wrapping hollow tube membrane members to form the bundle at a temperature above 100° F. (38° C.). Another method of forming a degassing system includes the step of the inserting bundle into an outer canister at a temperature above 100° F. (38° C.). A fuel supply system made by these methods is also disclosed.

Abstract: A fiber de-gassing membrane includes a plurality of membrane fibers. At least one of the membrane fibers has a first stiffness. The membrane includes reinforcing fibers. The reinforcing fibers are positioned adjacent to at least one of the membrane fibers. The reinforcing fibers have a second stiffness. The second stiffness is greater than the first stiffness.