On 7 July 2016, a right engine fire warning was annunciated as a Boeing 757-200 got airborne from New York JFK and after shutting the engine down in accordance with the corresponding checklist, an emergency declaration was followed by an immediate and uneventful return to land. After an external inspection confirmed there was no sign of an active fire, the aircraft was taxied to a terminal gate for normal disembarkation. The Investigation found that a fuel-fed fire had occurred because an O-ring had been incorrectly installed on a fuel tube during maintenance prior to the flight.