140993 on one its last flights before being retired to Davis-Monthan. It was sold as N3982Y and later became the prototype for the stretched Convair 5800 developed by Kelowna Flightcraft. Photo from: National Archives at College Park, Maryland

The aircraft was retired to MASDC in July 1980, its last USN duty being with the Naval Air Reserve Unit Naval Air Station North Island, hence the NARU NORIS markings. It was civilianised as N3982Y July 1983 and converted to CV580 configuration becoming C-FKFS with Kelowna Flightcraft. Selected as the prototype for the CV5800 stretch conversion it was re-registered N5800, making its first flight as such in November 1991. After testing was completed, it reverted to C-FKFS and operated for Kelowna until June 1998 when was sold as N381FL with Contract Air Cargo with whom it still serves.