When must the battery in an emergency locator transmitter (ELT) be replaced (or recharged if the battery is rechargeable)?
A
After one-half the battery's useful life.✓ Correct Answer
B
During each annual and 100-hour inspection.
C
Every 24 calendar months.
Explanation
14 CFR 91.207(c) requires ELT batteries to be replaced (or recharged, if rechargeable) when the transmitter has been in use for more than 1 cumulative hour or when 50 percent of the battery's useful life has expired. There is no fixed 24-month or every-inspection replacement rule; 91.207(d) requires an annual ELT inspection, not a new battery.
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