The Sierra Academy of Aeronautics in Atwater received three warning letters from the Federal Aviation Administration since 2005 for lapses in aircraft maintenance and inspections and for other violations.

The flight school at Castle Airport recently created headlines twice in a three-week period when its flight instructors made emergency landings near Turlock Municipal Airport and Turlock Lake following engine failures. Neither the flight instructors nor trainees were injured during the incidents, which occurred Wednesday and Jan. 27.

In November, a 26-year-old Sierra Academy student was killed when a plane's propeller hit him in the head.

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