On September 15, 2017, an incident involving a Boeing 737-8AS, registration EI-DLV, took place in London, United Kingdom. The aircraft was operated by Ryanair.
Under the provisions of ICAO Annex 13, the NTSB appointed a U.S. Accredited Representative to support the investigation being conducted by the Air Accidents Investigation Branch (AAIB) of the United Kingdom, acting as the State of Manufacturer and Design.