Although it differs from engine to engine, a standard passenger plane (the Boeing 727 in this case) creates around 165 dB under 15,000 lbs of thrust.
The American Speech-Language-Hearing Association lists a jet engine as measuring in at 140 decibels. This level is considered “painful,” as opposed to “extremely loud” (lawn mower), “very loud” (vacuum cleaner), “moderate” (dishwasher), and “faint” (whisper). Thus it is important to protect your hearing around jet engines such as by wearing noise-reducing ear plugs.
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