The ELT transmits a signal for how many hours once activated?

• A. 48 hours
• B. 12 hours
• C. 24 hours
• D. 72 hours

Answer: (A)

When an ELT is activated, it is designed to keep transmitting for about 48 hours. This duration ensures the distress signal remains detectable long enough for search and rescue to locate the beacon, even if it takes time to reach the crash site or remote areas. The 48-hour standard helps balance battery life, weight, and reliability, so satellites and ground teams have a solid window to pick up the signal. Shorter durations like 12 or 24 hours could miss delayed rescues, while a 72-hour life would require a larger, heavier battery and isn’t the typical specification for most ELTs.