Tony writes:

Just a word or two of caution, folks. Sound levels in SEL airplanes
can exceed 90 dB A at the pilot's ear, and prolonged exposure to that
level can lead to hearing loss. I stuff a couple of thousand bucks
worth of electronics in each ear now, partly because I didn't use a
headset in the airplane in my younger days (lots of gun fire and some
evidence of family hearing loss are also factors). Even if you're not
using the radio, protect your hearing.

Lower levels can also damage hearing over long periods. From what I've seen
of measured sound levels in GA aircraft (and some larger aircraft), many
pilots are risking significant hearing loss over the long term unless they
wear effective protection against cockpit noise.

In small aircraft, passengers should also wear ear protection.

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