When are non-rechargeable batteries of an emergency locator transmitter (ELT) required to be replaced?
A
Every 24 months.
B
When 50 percent of their useful life expires.✓ Correct Answer
C
At the time of each 100-hour or annual inspection.
Explanation
14 CFR 91.207(c) requires ELT batteries to be replaced when the transmitter has been in use for more than 1 cumulative hour or when 50 percent of their useful life has expired (or, for rechargeable batteries, 50 percent of useful life of charge). There is no fixed 24-month or every-inspection replacement rule.
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