When does the Emergency Locator Transmitter (ELT) activate?

• A. During routine maintenance
• B. At 15 gs
• C. At 30+ gs
• D. When manually activated

Answer: (C)

The Emergency Locator Transmitter (ELT) is designed to activate automatically during significant impact or crash conditions to aid in locating an aircraft in distress. Specifically, it typically activates at accelerations above a certain threshold, which is around 30 g's. This threshold is set to ensure that the ELT only activates following severe incidents, thereby reducing the chances of false alerts during normal operation or minor mishaps.

This threshold ensures that the ELT will transmit a distress signal and make it easier for search and rescue teams to locate the aircraft. Manual activation is also a feature, but it does not cover the automatic activation scenario that is critical for emergency responses. Other options, such as routine maintenance or a lower g force, do not typically trigger the ELT, as these would not indicate a situation requiring immediate search and rescue efforts. Therefore, recognizing the correct activation threshold reflects an understanding of the safety systems designed to enhance aircraft survivability in emergencies.