FAA Private Pilot Test Prep

Correct answer: B. 121.5 and 243 Mhz. The frequency is standard so that when an ELT emits a signal, planes and ground vehicles can conduct an emergency search. Remember that a hard landing could jostle the ELT. So if you have a hard landing and before you shut down the radio stack, turn to 121.5 to see if the ELT is going off. Otherwise Search and Rescue could show up at the airplane after you have left for the day.