Patent ID: 11964752
Assignee: THE BOEING COMPANY
Field: Transport (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 9:
10. An aircraft comprising:
a fuselage;
one or more wings attached to the fuselage;
one or more main landing gear retractably coupled to a center undercarriage portion of the fuselage;
a nose landing gear retractably coupled to a nose undercarriage portion of the fuselage;
one or more acoustically treated landing gear doors, each comprising:
a landing gear door attached to the fuselage, the landing gear door associated with one of, the one or more main landing gear, and the nose landing gear;
an acoustic treatment assembly integrated on an inner mold line of an interior side of the landing gear door, and extending within an interior cavity of the landing gear door, the acoustic treatment assembly comprising:
a core structure comprising:
a first side and a second side;
a plurality of core cells extending between the first side and the second side;
one or more porous septum layers coupled to one or more of the plurality of core cells; and
a drainage system configured to evacuate fluid from the core structure, the drainage system having a plurality of drainage paths coupled to one or more drainage exits, the plurality of drainage paths interconnected between the plurality of core cells, and the one or more drainage exits located at one or more perimeter portions of the landing gear door;
an acoustic facesheet coupled atop the first side of the core structure, the acoustic facesheet allowing fluid communication between an external environment and the plurality of core cells; and
a nonporous backsheet directly coupled between the second side of the core structure and a portion of the interior cavity of the landing gear door,

wherein the landing gear door comprises a placard printed on a portion of the acoustic facesheet, the placard having an exterior placard surface displaying markings that are legible, while maintaining a controlled porosity, and
wherein each of the one or more acoustically treated landing gear doors reduces noise created by acoustic waves emanating from one of, the one or more main landing gear, and the nose landing gear, in a deployed position, by absorbing the acoustic waves through the acoustic facesheet and the core structure of the acoustic treatment assembly, and reflecting the acoustic waves off the nonporous backsheet of the acoustic treatment assembly.