N21SG - 1976 Cessna 421C Aircraft Registration

N21SG is a 1976 Cessna 421C, a twin-engine reciprocating (piston) aircraft registered to Two One Sierra Golf LLC in Seattle, WA. This aircraft holds a standard airworthiness certificate issued by the Federal Aviation Administration on April 18, 1984. The registration certificate was issued on September 18, 2012. The registration is set to expire on September 30, 2028. Powered by a Cont Motor GTSIO-520 SER engine producing 435 horsepower, N21SG is. The aircraft's Mode S transponder code is A1B8C0 (hex), used for ADS-B identification and flight tracking. N21SG was last tracked by AviatorDB near King County International Airport - Boeing Field (KBFI) on March 21, 2026. The FAA registry record for N21SG was last updated on June 10, 2023. AviatorDB monitors aircraft positions through ADS-B surveillance data and updates records as new position data is received.

The Cessna 421 Golden Eagle was a pressurized twin-engine aircraft that brought high-altitude comfort to the business aviation market at a fraction of turboprop costs. First flown on May 1, 1967, it was a low-wing monoplane powered by two Continental GTSIO-520 turbocharged engines, seating six to eight occupants. With a service ceiling of 30,000 feet and cruise speed of 277 mph, the 421 spanned 43 feet 2 inches with a length of approximately 39 feet. Cessna Aircraft Company manufactured 1,901 examples between 1967 and 1985. AviatorDB tracks 80,556 Cessna aircraft currently registered in the FAA database. The ICAO type designator for this aircraft model is C421.

AviatorDB has found no NTSB accident or incident reports involving N21SG. AviatorDB cross-references all FAA registration data with NTSB accident and incident reports, providing a comprehensive safety overview for every registered aircraft in the United States.