Noise attenuating device to reduce noise generated by an opening in a skin of an aircraft

A noise attenuating device for reducing excitation of acoustic resonance in a cavity of an aircraft, the cavity having an opening in a skin of the aircraft, the opening defining a first surface area and an opening peripheral edge, the noise attenuating device comprising:

• a connection mechanism for securing the noise attenuating device in proximity to the opening in the skin of the aircraft;
• and
• an exterior surface that defines:
• a second surface area that is less than the first surface area of the opening;
• and
• a device peripheral edge comprising:
• i) a first section having an edge profile complimentary to at least a portion of the opening peripheral edge;
• and
• ii) a second section having an indented edge profile in relation to the first section such that when the noise attenuating device is secured within the opening, at least one gap is formed between the device peripheral edge and the opening peripheral edge.