A method of manufacturing an aircraft component, the method comprising: performing, by Additive Manufacturing apparatus, an Additive Manufacturing process to form an initial object, the initial object comprising: an inner tube comprising a first end, a second end opposite to the first end, and a first intermediate portion between the first end and the second end; an outer tube comprising a third end, a fourth end opposite to the third end, and a second intermediate portion between the third end and the fourth end; wherein the inner tube is inside the outer tube; the inner tube and the outer tube are attached together in such a way that only the first end and the third end are attached together and the second end and the fourth end are attached together, and such that the first intermediate portion and the second intermediate portion are spaced apart and not directly connected together; and there is a chamber between the first intermediate portion and the second intermediate portion, the chamber having a chamber opening; establishing, within the chamber, via the chamber opening, a predetermined environment; and thereafter, sealing the chamber opening so as to maintain, within the chamber, the established environment, thereby producing the aircraft component. performing, by Additive Manufacturing apparatus, an Additive Manufacturing process to form an initial object, the initial object comprising: an inner tube comprising a first end, a second end opposite to the first end, and a first intermediate portion between the first end and the second end; an outer tube comprising a third end, a fourth end opposite to the third end, and a second intermediate portion between the third end and the fourth end; wherein the inner tube is inside the outer tube; the inner tube and the outer tube are attached together in such a way that only the first end and the third end are attached together and the second end and the fourth end are attached together, and such that the first intermediate portion and the second intermediate portion are spaced apart and not directly connected together; and there is a chamber between the first intermediate portion and the second intermediate portion, the chamber having a chamber opening; an inner tube comprising a first end, a second end opposite to the first end, and a first intermediate portion between the first end and the second end; an outer tube comprising a third end, a fourth end opposite to the third end, and a second intermediate portion between the third end and the fourth end; wherein the inner tube is inside the outer tube; the inner tube and the outer tube are attached together in such a way that only the first end and the third end are attached together and the second end and the fourth end are attached together, and such that the first intermediate portion and the second intermediate portion are spaced apart and not directly connected together; and there is a chamber between the first intermediate portion and the second intermediate portion, the chamber having a chamber opening; establishing, within the chamber, via the chamber opening, a predetermined environment; and thereafter, sealing the chamber opening so as to maintain, within the chamber, the established environment, thereby producing the aircraft component.