Hush kits are acoustic suppression packages retrofitted to turbofan and turbojet engines to attenuate jet and fan noise to meet ICAO Chapter 3 or Chapter 4 certification standards, comprising inlet and exhaust duct acoustic liners, multi-lobe mixer nozzles, and treated nacelle panels incorporating sound-absorbing honeycomb core composites and perforate-face-sheet constructions tuned to target noise frequencies.
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