When must batteries in an emergency locator transmitter (ELT) be replaced or recharged, if rechargeable?
A
After any inadvertent activation of the ELT.
B
When the ELT has been in use for more than 1 cumulative hour.✓ Correct Answer
C
When the ELT can no longer be heard over the airplane's communication radio receiver.
Explanation
Under 14 CFR 91.207(c), ELT batteries must be replaced (or recharged, if rechargeable) when the transmitter has been in use for more than 1 cumulative hour, or when 50 percent of their useful life (or charge life) has expired. A single inadvertent activation or a weak signal on the radio is not the regulatory trigger.
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