Petty Officer 1st Class Matthew Sheline (center), of Vero Beach, Fla., an instructor at the Coast Guard's Aviation Electronics Technician "A" School, explains use of the helicopter's internal communication systems to two of his students, Airman Evandro da Costa Filho (left), of Delray Beach, Fla., and Airman Lawrence Felton, of Pawleys Island, N.C., aboard an MH-65 Dolphin simulator March 19, 2014. The 56-week AET school, one of three Class "A" Schools at ATTC that provide initial rate-specific training, teaches students entry-level ability to inspect, service and maintain a wide variety of aircraft electrical, communication, navigation, auto flight and sensor avionics systems. In the third phase of the school, which lasts seven weeks, students learn about avionics and navigation systems. Following graduation, AETs may be assigned to either rotary or fixed-wing aircraft, where they might fill aircrew positions including navigator, flight mechanic, radio operator, sensor systems operator or basic aircrewman.