FAA Ground School Practice Test

What should be monitored to ensure that the emergency locator transmitter (ELT) has not been activated?

1. VHF frequencies

2. 121.5 before engine shutdown

3. All emergency frequencies

4. Clear of all frequencies

The correct answer is: 121.5 before engine shutdown

Monitoring 121.5 MHz before engine shutdown is crucial because this frequency is specifically designated for emergency communications, including calls from emergency locator transmitters (ELTs). If an ELT has been activated, it will typically transmit a distress signal on this frequency, alerting nearby aircraft and ground stations to the emergency situation. Therefore, by checking this frequency before shutting down the engine, pilots can confirm that their ELT is not inadvertently broadcasting, which allows them to avoid possible search and rescue operations triggered by an activated ELT. The other responses, while related to emergency communications, do not specifically address the need to verify the status of the ELT as effectively as monitoring 121.5 does. For example, VHF frequencies encompass a wide range of communications but do not specifically target the emergency signals relevant for ELTs. Monitoring all emergency frequencies is broader and less focused, potentially missing the critical check intended with 121.5. Being clear of all frequencies implies avoiding any transmission, which does not provide the necessary step to confirm the ELT’s status.