YANKTON, S.D. (AP) — Officials say the pilot of a small helicopter was killed in a crash in southeastern South Dakota. The Federal Aviation Administration said the AG-915 Spartan helicopter went down Tuesday morning near the Chan Gurney Municipal Airport in Yankton. Officials say only the pilot was on board. Yankton Assistant Fire Chief Larry Nickels tells WNAX radio the aircraft was destroyed upon impact. Nickels says the FAA and the National Transportation Safety Board have been called to investigate because a fatality is involved.