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Noun1.sweep-second - a second hand that is mounted on the same center as the hour and minute hand and is read on the minutes
second hand - hand marking seconds on a timepiece
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205(d) author Elaine Kauh wrote: "Technically, the clock displaying hours, minutes, and seconds with a sweep-second pointer or digital presentation' is supposed to be certified, installed equipment, meaning it has to be the original clock or an approved replacement, and it has to be operational for legal IFR flight.
So, OK, the folks at CDC could have provided a little more certainty by referring us to the sweep-second hand on the clock, not leaving us to wonder.
Nothing beats the sophistication of an analog watch with its gold or silver case and matching band and sweep-second hand.