The Australian Transport Safety Bureau (ATSB) notified the NTSB of an incident involving a Boeing 737 that took place on December 12, 2016, in Adelaide, Australia. Because the aircraft is a Boeing design, the NTSB appointed a U.S. Accredited Representative to support the ATSB investigation in accordance with ICAO Annex 13. The aircraft registration for this event is listed as UNK.