Continental GTSIO-520 series
179 aircraft on the U.S. register carry a Continental GTSIO-520 series engine, rated at about 300 horsepower. The Cessna 421 Golden Eagle is the model most often fitted with it (164 aircraft). The aircraft carrying it were built between 1958 and 2025.
The FAA records engines by code, usually at the level of a series ("O-320 series") rather than the exact variant; this page gathers every FAA code that reads as Continental GTSIO-520 series (2 codes). FAA spellings: GTSIO-520 SER · GTSIO-520 SER.
Fitted to model families
Cessna 421 Golden Eagle164Cessna 4046Beechcraft A36 Bonanza1Beechcraft T-341Beechcraft V35 Bonanza1Cessna 180 Skywagon1Cessna 210 Centurion1Cessna 3051Costruzioni Aeronautiche Tecna P20121Grumman American Avn. Corp. G-1641Kosco Matthew LANCAIR IV1
Cessna 421 Golden Eagle · Cessna 404 · Beechcraft A36 Bonanza · Beechcraft T-34 · Beechcraft V35 Bonanza · Cessna 180 Skywagon · Cessna 210 Centurion · Cessna 305 · Costruzioni Aeronautiche Tecna P2012 · Grumman American Avn. Corp. G-164
Where they are owner's state
Texas27Florida17California15Delaware10Nevada8Montana8Oklahoma7Kansas7Michigan6Colorado5
Kind of aircraft
Piston twins171 (96%)Piston singles6 (3%)Turboprops2 (1%)
When the aircraft were built by decade
What the FAA has certified, ordered and been told about the Continental GTSIO-520 series the component layer
No FAA order in the current files names this engine series. Operators and repair shops have filed 94 failure reports with the FAA since 1995, 3 of them in the last ten years.
Failure reports 94 since · what operators and shops told the FAA
Parts most often reported as the reports name them
Cylinder10Crankcase8Adapter3Bellcrank3Engine3Alternator2Bearing2Bolt2Control Cable2Crankshaft2
Latest reports
2026-05-03Intake Duct: loose
2019-10-28Engine: malfunctioned
2018-07-31Actuator: failed
2016-05-10Alternator: failed
2015-11-09Intake Valve: failed
Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.
Connections how this engine series links to the rest of the register
Fitted to
- Cessna 421 Golden Eagle 164 with this engine series
- Cessna 404 6 with this engine series
- Beechcraft A36 Bonanza 1 with this engine series
- Beechcraft T-34 1 with this engine series
- Beechcraft V35 Bonanza 1 with this engine series
- Cessna 180 Skywagon 1 with this engine series
- Cessna 210 Centurion 1 with this engine series
- Cessna 305 1 with this engine series
Where they are
- Texas 27 of these aircraft
- Florida 17 of these aircraft
- California 15 of these aircraft
- Delaware 10 of these aircraft
- Nevada 8 of these aircraft
Biggest operators
- Dodson International Parts INC 4 of these aircraft
- Bas Part Sales LLC 3 of these aircraft
- South Aero INC 2 of these aircraft
- International Air Services INC Trustee 2 of these aircraft
Airworthiness
- Failure reports on the Continental GTSIO-520 series 94 reports since 1995
Analytics
These connections as data: /graph/engine/continental-gtsio-520-series.json · about the eFlight graph.
Aircraft newest certificates first · 179
| Tail no. | Maker and model | Group | Owner and base | Certificate | Registered | Status |
|---|---|---|---|---|---|---|
| N421ME | Cessna 421C |
Fixed-wing, multi-engine | Meisner Aircraft INC Janesville, Wisconsin |
Standard | 2026-09-23 | ValidFAA registration status code V: Valid registration. All codes |
| N4492U | Cessna 421C |
Fixed-wing, multi-engine | Aircraft & Aviation Professionals LLC Coldwater, Michigan |
Standard | 2026-08-29 | ValidFAA registration status code V: Valid registration. All codes |
| N421GL | Cessna 421C |
Fixed-wing, multi-engine | 421 Partners Georgia LLC Chatsworth, Georgia |
Standard | 2026-08-12 | ValidFAA registration status code V: Valid registration. All codes |
| N421MD | Cessna 421C |
Fixed-wing, multi-engine | Boss Contract Services LLC Terry, Montana |
Standard | 2026-07-28 | ValidFAA registration status code V: Valid registration. All codes |
| N421SF | Cessna 421C |
Fixed-wing, multi-engine | Co-owned owner Kansas |
Standard | 2026-06-18 | ValidFAA registration status code V: Valid registration. All codes |
| N421LK | Cessna 421C |
Fixed-wing, multi-engine | Paradise Flyers LLC Summerland Key, Florida |
Standard | 2026-04-18 | ValidFAA registration status code V: Valid registration. All codes |
| N5417C | Cessna 421C |
Fixed-wing, multi-engine | Executive Aircraft Management Services LLC Pompano Beach, Florida |
Standard | 2026-04-09 | ValidFAA registration status code V: Valid registration. All codes |
| N287TA | Costruzioni Aeronautiche Tecna P2012 TRAVELLER |
Fixed-wing, multi-engine | Sivad Holdings CORP Nacogdoches, Texas |
Standard | 2026-02-28 | ValidFAA registration status code V: Valid registration. All codes |
| N421GM | Cessna 421C |
Fixed-wing, multi-engine | Cjk Investment Holdings LLC Tallahassee, Florida |
Standard | 2026-02-05 | ValidFAA registration status code V: Valid registration. All codes |
| N342RC | Cessna 421C |
Fixed-wing, multi-engine | Hyland'S Pharmacy LLC Wheeler, Texas |
Standard | 2025-12-05 | ValidFAA registration status code V: Valid registration. All codes |
| N421ZM | Cessna 421C |
Fixed-wing, multi-engine | 3Tr Aviation LLC Longview, Texas |
Standard | 2025-11-23 | ValidFAA registration status code V: Valid registration. All codes |
| N1510G | Cessna 421B |
Fixed-wing, multi-engine | Gmr Leasing LLC Lincoln, Delaware |
Standard | 2025-11-06 | ValidFAA registration status code V: Valid registration. All codes |
| N228JH | Cessna 421C |
Fixed-wing, multi-engine | Buzzed Landing LLC Ocean Springs, Mississippi |
Standard | 2025-11-06 | ValidFAA registration status code V: Valid registration. All codes |
| N440DL | Cessna 421C |
Fixed-wing, multi-engine | 421 Partners LLC Crown Point, Indiana |
Standard | 2025-10-23 | ValidFAA registration status code V: Valid registration. All codes |
| N40RU | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Georgia |
Standard | 2025-10-20 | ValidFAA registration status code V: Valid registration. All codes |
| N6315X | Cessna 421C |
Fixed-wing, multi-engine | Eagle Aviation LLC Morristown, Tennessee |
Standard | 2025-10-10 | ValidFAA registration status code V: Valid registration. All codes |
| N421RH | Cessna 421B |
Fixed-wing, multi-engine | World Tradex INC Missoula, Montana |
Standard | 2025-08-18 | ValidFAA registration status code V: Valid registration. All codes |
| N413VV | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Michigan |
Standard | 2025-08-08 | ValidFAA registration status code V: Valid registration. All codes |
| N421AG | Cessna 421C |
Fixed-wing, multi-engine | Farm Flysician LLC Ardmore, Oklahoma |
Standard | 2025-07-11 | ValidFAA registration status code V: Valid registration. All codes |
| N26588 | Cessna 421C |
Fixed-wing, multi-engine | Golden Aero LLC Tarpon Springs, Florida |
Standard | 2025-06-18 | ValidFAA registration status code V: Valid registration. All codes |
| N200BN | Cessna 421C |
Fixed-wing, multi-engine | Rubber Duck Aviation LLC Brunswick, Georgia |
Standard | 2025-05-13 | ValidFAA registration status code V: Valid registration. All codes |
| N95GM | Cessna 421C |
Fixed-wing, multi-engine | Meinig High Club LLC Klamath Falls, Oregon |
Standard | 2025-05-09 | ValidFAA registration status code V: Valid registration. All codes |
| N160DC | Cessna 421C |
Fixed-wing, multi-engine | Pdii LLC Concord, North Carolina |
Standard | 2025-04-07 | ValidFAA registration status code V: Valid registration. All codes |
| N429GM | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 2025-03-24 | ValidFAA registration status code V: Valid registration. All codes |
| N21SS | Cessna 421C |
Fixed-wing, multi-engine | Co-owned owner Ohio |
Standard | 2025-02-18 | ValidFAA registration status code V: Valid registration. All codes |
| N6633T | Cessna 421C |
Fixed-wing, multi-engine | C C I C Aircraft Division One LLC Kalispell, Montana |
Standard | 2025-02-18 | ValidFAA registration status code V: Valid registration. All codes |
| N369RM | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Arizona |
Standard | 2025-02-14 | ValidFAA registration status code V: Valid registration. All codes |
| N520AB | Cessna 421C |
Fixed-wing, multi-engine | Golden Eagle Transportation LLC Lafayette, Louisiana |
Standard | 2025-02-12 | ValidFAA registration status code V: Valid registration. All codes |
| N422CM | Cessna 421C |
Fixed-wing, multi-engine | Aerostar Aviation LLC Tucson, Arizona |
Standard | 2025-02-10 | ValidFAA registration status code V: Valid registration. All codes |
| N422PJ | Cessna 421C |
Fixed-wing, multi-engine | Cra Aviation LLC Dickerson, Maryland |
Standard | 2025-02-09 | ValidFAA registration status code V: Valid registration. All codes |
| N877JB | Cessna 421C |
Fixed-wing, multi-engine | Og Flights LLC Dover, Delaware |
Standard | 2025-02-05 | ValidFAA registration status code V: Valid registration. All codes |
| N421MY | Cessna 421B |
Fixed-wing, multi-engine | Ozark Trails Youth Services INC West Plains, Missouri |
Standard | 2025-01-28 | ValidFAA registration status code V: Valid registration. All codes |
| N260RA | Cessna 421C |
Fixed-wing, multi-engine | Upward Aviation LLC Tulsa, Oklahoma |
Standard | 2025-01-27 | ValidFAA registration status code V: Valid registration. All codes |
| N605DC | Cessna 421C |
Fixed-wing, multi-engine | T&C Aviators LLC Green Cove Springs, Florida |
Standard | 2025-01-27 | ValidFAA registration status code V: Valid registration. All codes |
| N421VA | Cessna 421C |
Fixed-wing, multi-engine | Co-owned owner Michigan |
Standard | 2025-01-15 | ValidFAA registration status code V: Valid registration. All codes |
| N421VF | Cessna 421C |
Fixed-wing, multi-engine | N421Vf LLC Lindsay, Texas |
Standard | 2024-12-07 | ValidFAA registration status code V: Valid registration. All codes |
| N726LA | Cessna 421B |
Fixed-wing, multi-engine | Valiair Lc Trustee Casper, Wyoming |
Standard | 2024-11-21 | ValidFAA registration status code V: Valid registration. All codes |
| N1QM | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 2024-11-08 | ValidFAA registration status code V: Valid registration. All codes |
| N37RZ | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Colorado |
Standard | 2024-10-31 | ValidFAA registration status code V: Valid registration. All codes |
| N588TB | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Nevada |
Standard | 2024-10-19 | ValidFAA registration status code V: Valid registration. All codes |
| N421ML | Cessna 421C |
Fixed-wing, multi-engine | Lps Utilities INC DBA Woodstock, Illinois |
Special flight permit | 2024-10-08 | ValidFAA registration status code V: Valid registration. All codes |
| N464DC | Cessna 421C |
Fixed-wing, multi-engine | Co-owned owner Arizona |
Standard | 2024-08-08 | ValidFAA registration status code V: Valid registration. All codes |
| N6798V | Cessna 421C |
Fixed-wing, multi-engine | Gaylord Hangars LLC Gaylord, Michigan |
Standard | 2024-07-09 | ValidFAA registration status code V: Valid registration. All codes |
| N375KC | Cessna 421C |
Fixed-wing, multi-engine | Guittard Chocolate Holdings CO Burlingame, California |
Standard | 2024-06-25 | ValidFAA registration status code V: Valid registration. All codes |
| N664S | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 2024-06-25 | ValidFAA registration status code V: Valid registration. All codes |
| N116JJ | Cessna 421C |
Fixed-wing, multi-engine | Progress Aviation LLC Ellicott City, Maryland |
Standard | 2024-05-09 | ValidFAA registration status code V: Valid registration. All codes |
| N421TX | Cessna 421C |
Fixed-wing, multi-engine | Holly Factory Alachua, Florida |
Standard | 2024-04-25 | ValidFAA registration status code V: Valid registration. All codes |
| N485DS | Cessna 421C |
Fixed-wing, multi-engine | Encinal Aviation LLC Springfield, Missouri |
Standard | 2024-04-25 | ValidFAA registration status code V: Valid registration. All codes |
| N421KM | Cessna 421C |
Fixed-wing, multi-engine | Weatherproof Montana LLC Missoula, Montana |
Standard | 2024-04-17 | ValidFAA registration status code V: Valid registration. All codes |
| N915LP | Cessna 421B |
Fixed-wing, multi-engine | Lee Flight Services LLC Davie, Florida |
Standard | 2024-04-03 | ValidFAA registration status code V: Valid registration. All codes |
| N421VG | Cessna 421C |
Fixed-wing, multi-engine | Cooper421 LLC Haltom City, Texas |
Standard | 2024-03-02 | ValidFAA registration status code V: Valid registration. All codes |
| N421GJ | Cessna 421C |
Fixed-wing, multi-engine | Aeroventures 8 LLC Mount Carmel, Tennessee |
Standard | 2024-01-31 | ValidFAA registration status code V: Valid registration. All codes |
| N630AD | Cessna 421C |
Fixed-wing, multi-engine | T Machine LLC Livingston, Montana |
Standard | 2024-01-25 | ValidFAA registration status code V: Valid registration. All codes |
| N404NE | Cessna 404 |
Fixed-wing, multi-engine | Individual owner Florida |
Standard | 2024-01-01 | ValidFAA registration status code V: Valid registration. All codes |
| N880JS | Cessna 421C |
Fixed-wing, multi-engine | Dodson International Parts INC Rantoul, Kansas |
Standard | 2023-11-16 | ValidFAA registration status code V: Valid registration. All codes |
| N421GE | Cessna 421B |
Fixed-wing, multi-engine | Mels Priced Right Custom Carts Lakeland, Florida |
Standard | 2023-11-03 | ValidFAA registration status code V: Valid registration. All codes |
| N467DM | Cessna 421B |
Fixed-wing, multi-engine | Mustang Sally Aviation LLC Camden, South Carolina |
Standard | 2023-10-28 | ValidFAA registration status code V: Valid registration. All codes |
| N421J | Cessna 421C |
Fixed-wing, multi-engine | 421J LLC Chuckey, Tennessee |
Standard | 2023-09-27 | ValidFAA registration status code V: Valid registration. All codes |
| N1206N | Cessna 421C |
Fixed-wing, multi-engine | Capital Group INC Garden City, Idaho |
Standard | 2023-09-23 | ValidFAA registration status code V: Valid registration. All codes |
| N264DC | Cessna 421C |
Fixed-wing, multi-engine | Airdvm LLC Rcho Sta Marg, California |
Standard | 2023-09-20 | ValidFAA registration status code V: Valid registration. All codes |
| N421LE | Cessna 421C |
Fixed-wing, multi-engine | N421Le LLC High Springs, Florida |
Standard | 2023-09-15 | ValidFAA registration status code V: Valid registration. All codes |
| N859DM | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 2023-09-06 | ValidFAA registration status code V: Valid registration. All codes |
| N5443J | Cessna 421B |
Fixed-wing, multi-engine | Kg&C Investment LLC Saint Charles, Illinois |
Standard | 2023-08-16 | ValidFAA registration status code V: Valid registration. All codes |
| N459DM | Cessna 421C |
Fixed-wing, multi-engine | Stafford Wings LLC Fredericksburg, Virginia |
Standard | 2023-07-30 | ValidFAA registration status code V: Valid registration. All codes |
| N421SR | Cessna 421C |
Fixed-wing, multi-engine | Wing Aero LLC Dover, Delaware |
Standard | 2023-05-27 | ValidFAA registration status code V: Valid registration. All codes |
| N214CC | Cessna 421C |
Fixed-wing, multi-engine | Steele Aviation LLC Tuscaloosa, Alabama |
Standard | 2023-05-18 | ValidFAA registration status code V: Valid registration. All codes |
| N80BS | Cessna 404 |
Fixed-wing, multi-engine | Sonrise Aviation LLC Portland, Indiana |
Standard | 2023-04-22 | ValidFAA registration status code V: Valid registration. All codes |
| N2657N | Cessna 421C |
Fixed-wing, multi-engine | Loreto Aviation LLC Wahoo, Nebraska |
Standard | 2023-04-08 | ValidFAA registration status code V: Valid registration. All codes |
| N40ME | Cessna 421C |
Fixed-wing, multi-engine | Unlimited Boat Sales INC Page, Arizona |
Standard | 2023-04-06 | ValidFAA registration status code V: Valid registration. All codes |
| N567WA | Cessna 421C |
Fixed-wing, multi-engine | Jasper Aviation INC Jasper, Alabama |
Standard | 2023-04-03 | ValidFAA registration status code V: Valid registration. All codes |
| N821KA | Cessna 421C |
Fixed-wing, multi-engine | Ka Consulting LLC San Juan, Puerto Rico |
Standard | 2023-02-24 | ValidFAA registration status code V: Valid registration. All codes |
| N600DC | Cessna 421C |
Fixed-wing, multi-engine | Herron Aviation Group LLC Dexter, Michigan |
Standard | 2023-01-24 | ValidFAA registration status code V: Valid registration. All codes |
| N411MZ | Cessna 421C |
Fixed-wing, multi-engine | Songbird Air LLC Lakewood, Colorado |
Standard | 2023-01-17 | ValidFAA registration status code V: Valid registration. All codes |
| N12RJ | Cessna 421C |
Fixed-wing, multi-engine | Desert Air Ambulance INC Blythe, California |
Standard | 2023-01-16 | ValidFAA registration status code V: Valid registration. All codes |
| N284DM | Cessna 421C |
Fixed-wing, multi-engine | Dreamworks Aviation LLC Palm Beach Gardens, Florida |
Standard | 2023-01-06 | ValidFAA registration status code V: Valid registration. All codes |
| N723ES | Cessna 421C |
Fixed-wing, multi-engine | Es Owens LLC Mustang, Oklahoma |
Standard | 2022-12-28 | ValidFAA registration status code V: Valid registration. All codes |
| N577RJ | Cessna 421C |
Fixed-wing, multi-engine | Aviation Trust Company LLC Oklahoma City, Oklahoma |
Standard | 2022-12-19 | ValidFAA registration status code V: Valid registration. All codes |
| N421CX | Cessna 421C |
Fixed-wing, multi-engine | Patriot Aircraft Specialist LLC Boynton Beach, Florida |
Standard | 2022-12-08 | ValidFAA registration status code V: Valid registration. All codes |
| N421LQ | Cessna 421C |
Fixed-wing, multi-engine | Apex A & K LLC Englewood, Florida |
Standard | 2022-12-01 | ValidFAA registration status code V: Valid registration. All codes |
| N66CL | Cessna 421C |
Fixed-wing, multi-engine | Liberty Eagle LLC Helena, Montana |
Standard | 2022-10-21 | ValidFAA registration status code V: Valid registration. All codes |
| N43KT | Beech A36 |
Fixed-wing, single engine | Individual owner California |
Standard | 2022-10-19 | ValidFAA registration status code V: Valid registration. All codes |
| N421JW | Cessna 421C |
Fixed-wing, multi-engine | Wheels Up Aviation LLC Edmond, Oklahoma |
Restricted | 2022-09-02 | ValidFAA registration status code V: Valid registration. All codes |
| N554CC | Cessna 421C |
Fixed-wing, multi-engine | Amg/Sherfick Aviation LLC Noblesville, Indiana |
Standard | 2022-08-06 | ValidFAA registration status code V: Valid registration. All codes |
| N421TV | Cessna 421C |
Fixed-wing, multi-engine | Yuba City Solar Millennium Fund LLC Rocklin, California |
Standard | 2022-08-04 | ValidFAA registration status code V: Valid registration. All codes |
| N97FC | Cessna 180E |
Fixed-wing, single engine | Individual owner Texas |
Standard | 2022-07-18 | ValidFAA registration status code V: Valid registration. All codes |
| N878DM | Cessna 421C |
Fixed-wing, multi-engine | Fly North 421 LLC Helena, Montana |
Standard | 2022-07-08 | ValidFAA registration status code V: Valid registration. All codes |
| N994MZ | Cessna 421C |
Fixed-wing, multi-engine | Mahz Air LLC Laredo, Texas |
Standard | 2022-06-23 | ValidFAA registration status code V: Valid registration. All codes |
| N315M | Cessna 421B |
Fixed-wing, multi-engine | Duckwing LLC Reno, Nevada |
Standard | 2022-05-19 | ValidFAA registration status code V: Valid registration. All codes |
| N438EL | Cessna 421C |
Fixed-wing, multi-engine | 1 Stop Sod & Landscaping INC Orlando, Florida |
Standard | 2022-05-10 | ValidFAA registration status code V: Valid registration. All codes |
| N37JK | Cessna 421B |
Fixed-wing, multi-engine | Ssr LLC Incline Village, Nevada |
Standard | 2022-03-29 | ValidFAA registration status code V: Valid registration. All codes |
| N5962M | Cessna 421B |
Fixed-wing, multi-engine | Kitov Resources CORP Shorewood, Wisconsin |
Standard | 2022-03-28 | ValidFAA registration status code V: Valid registration. All codes |
| N421TF | Cessna 421C |
Fixed-wing, multi-engine | Intrepid Enterprises LLC Wichita, Kansas |
Standard | 2022-03-09 | ValidFAA registration status code V: Valid registration. All codes |
| N388BC | Beech V35B |
Fixed-wing, single engine | Aerospace Trust Management LLC Wilmington, Delaware |
Special flight permit | 2022-03-01 | ValidFAA registration status code V: Valid registration. All codes |
| N816LH | Cessna 421B |
Fixed-wing, multi-engine | L Howard Construction INC Abernathy, Texas |
Standard | 2022-02-22 | ValidFAA registration status code V: Valid registration. All codes |
| N31KS | Cessna 421B |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 2022-02-14 | ValidFAA registration status code V: Valid registration. All codes |
| N421TA | Cessna 421C |
Fixed-wing, multi-engine | Qualitair LLC Trustee Michelstadt, |
Standard | 2021-11-16 | ValidFAA registration status code V: Valid registration. All codes |
| N18T | Cessna 421 |
Fixed-wing, multi-engine | N18T LTD Wilmington, Delaware |
Standard | 2021-10-23 | ValidFAA registration status code V: Valid registration. All codes |
| N3920C | Cessna 421C |
Fixed-wing, multi-engine | N3920C Lc Wichita, Kansas |
Standard | 2021-10-23 | ValidFAA registration status code V: Valid registration. All codes |
| N1421M | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Nevada |
Standard | 2021-09-14 | ValidFAA registration status code V: Valid registration. All codes |
| N188GW | Cessna 421C |
Fixed-wing, multi-engine | Brown Die Casting & Manufacturing INC Royse City, Texas |
Standard | 2021-09-02 | ValidFAA registration status code V: Valid registration. All codes |
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Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 5, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.