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 |
|---|---|---|---|---|---|---|
| N421WC | Cessna 421C |
Fixed-wing, multi-engine | One Eyed Pilot LLC Columbia, South Carolina |
Standard | 2021-08-19 | ValidFAA registration status code V: Valid registration. All codes |
| N821TT | Cessna 421C |
Fixed-wing, multi-engine | Home By Dark LLC Fredericksburg, Texas |
Standard | 2021-08-16 | ValidFAA registration status code V: Valid registration. All codes |
| N241TS | Cessna 421B |
Fixed-wing, multi-engine | Grey Matter INC Valley Springs, California |
Standard | 2021-06-11 | ValidFAA registration status code V: Valid registration. All codes |
| N344TC | Cessna 421C |
Fixed-wing, multi-engine | International Air Services INC Trustee Carson City, Nevada |
Standard | 2021-06-05 | ValidFAA registration status code V: Valid registration. All codes |
| N6710Q | Grumman American Avn. Corp G-164B |
Fixed-wing, single engine | Individual owner Arkansas |
Restricted | 2021-06-02 | ValidFAA registration status code V: Valid registration. All codes |
| N925BK | Cessna 421C |
Fixed-wing, multi-engine | Acom Electronic Measurement Technology INC Milpitas, California |
Standard | 2021-03-10 | ValidFAA registration status code V: Valid registration. All codes |
| N421GP | Cessna 421C |
Fixed-wing, multi-engine | Circle Capital Industrial Iac LLC Dover, Delaware |
Standard | 2020-12-10 | ValidFAA registration status code V: Valid registration. All codes |
| N648SB | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 2020-12-01 | ValidFAA registration status code V: Valid registration. All codes |
| N2660U | Cessna 421C |
Fixed-wing, multi-engine | United Front Holdings LLC Laguna Hills, California |
Standard | 2020-10-21 | ValidFAA registration status code V: Valid registration. All codes |
| N53RR | Cessna 421A |
Fixed-wing, multi-engine | Two Romeos LLC Pasco, Washington |
Standard | 2020-10-06 | ValidFAA registration status code V: Valid registration. All codes |
| N422GM | Cessna 421C |
Fixed-wing, multi-engine | Midocin LLC Southfield, Michigan |
Standard | 2020-08-31 | ValidFAA registration status code V: Valid registration. All codes |
| N440LJ | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Nevada |
Standard | 2020-08-31 | ValidFAA registration status code V: Valid registration. All codes |
| N311JH | Cessna 421C |
Fixed-wing, multi-engine | Huaco Aviation LLC Waco, Texas |
Standard | 2020-04-21 | ValidFAA registration status code V: Valid registration. All codes |
| N97AQ | Cessna 404 |
Fixed-wing, multi-engine | Khag Aviation INC Woodbridge, New Jersey |
Standard | 2020-04-14 | ValidFAA registration status code V: Valid registration. All codes |
| N421TM | Cessna 421B |
Fixed-wing, multi-engine | Co-owned owner Washington |
Standard | 2020-04-13 | ValidFAA registration status code V: Valid registration. All codes |
| N8825G | Cessna 404 |
Fixed-wing, multi-engine | Individual owner U.S. Virgin Islands |
Standard | 2020-04-13 | ValidFAA registration status code V: Valid registration. All codes |
| N54TT | Cessna 421C |
Fixed-wing, multi-engine | Redcell Air INC Miami, Florida |
Standard | 2020-03-05 | ValidFAA registration status code V: Valid registration. All codes |
| N842DY | Cessna 421C |
Fixed-wing, multi-engine | Altimate Transportaton Services LLC Dallas, Texas |
Standard | 2020-02-14 | ValidFAA registration status code V: Valid registration. All codes |
| N421EQ | Cessna 421C |
Fixed-wing, multi-engine | Equus Air LLC Norman, Oklahoma |
Standard | 2020-01-28 | ValidFAA registration status code V: Valid registration. All codes |
| N421WK | Cessna 421C |
Fixed-wing, multi-engine | Kb Air LLC Bakersfield, California |
Standard | 2020-01-03 | ValidFAA registration status code V: Valid registration. All codes |
| N146TJ | Cessna 421C |
Fixed-wing, multi-engine | Birdboys2 Aviation LLC Boerne, Texas |
Standard | 2019-12-12 | ValidFAA registration status code V: Valid registration. All codes |
| N81LP | Cessna 421C |
Fixed-wing, multi-engine | Sky West Aviation INC Trustee Albuquerque, New Mexico |
Standard | 2019-11-21 | ValidFAA registration status code V: Valid registration. All codes |
| N421DS | Cessna 421C |
Fixed-wing, multi-engine | N421Ds LLC Villa Rica, Georgia |
Standard | 2019-10-30 | ValidFAA registration status code V: Valid registration. All codes |
| N60GM | Cessna 421C |
Fixed-wing, multi-engine | International Air Services INC Trustee Carson City, Nevada |
Standard | 2019-10-09 | ValidFAA registration status code V: Valid registration. All codes |
| N421G | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Alaska |
Standard | 2019-07-19 | ValidFAA registration status code V: Valid registration. All codes |
| N900CB | Cessna 421C |
Fixed-wing, multi-engine | Hnl Group LLC Minnetonka, Minnesota |
Standard | 2019-05-29 | ValidFAA registration status code V: Valid registration. All codes |
| N62DW | Cessna 421 |
Fixed-wing, multi-engine | Sagamore Sky LLC Jericho, New York |
Standard | 2019-05-20 | ValidFAA registration status code V: Valid registration. All codes |
| N421ZZ | Cessna 421C |
Fixed-wing, multi-engine | 421Zz LLC Wilmington, Delaware |
Standard | 2019-03-20 | ValidFAA registration status code V: Valid registration. All codes |
| N587MW | Cessna 421B |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 2018-11-07 | ValidFAA registration status code V: Valid registration. All codes |
| N421CY | Cessna 421C |
Fixed-wing, multi-engine | Legacy Air LLC West Chicago, Illinois |
Standard | 2018-09-26 | ValidFAA registration status code V: Valid registration. All codes |
| N421CG | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 2018-09-05 | ValidFAA registration status code V: Valid registration. All codes |
| N920RC | Cessna 404 |
Fixed-wing, multi-engine | South Aero INC Albuquerque, New Mexico |
Standard | 2018-07-19 | ValidFAA registration status code V: Valid registration. All codes |
| N809RQ | Cessna 404 |
Fixed-wing, multi-engine | South Aero INC Albuquerque, New Mexico |
Standard | 2018-07-09 | ValidFAA registration status code V: Valid registration. All codes |
| N421AR | Cessna 421C |
Fixed-wing, multi-engine | Hlc Travel LLC Perham, Minnesota |
Standard | 2018-05-16 | ValidFAA registration status code V: Valid registration. All codes |
| N483MM | Cessna 421C |
Fixed-wing, multi-engine | Western Rivers Aircraft LLC Paducah, Kentucky |
Standard | 2018-05-03 | ValidFAA registration status code V: Valid registration. All codes |
| N421GK | Cessna 421C |
Fixed-wing, multi-engine | K2 Aviation LLC Sanford, North Carolina |
Standard | 2018-03-29 | ValidFAA registration status code V: Valid registration. All codes |
| N444BG | Cessna 421C |
Fixed-wing, multi-engine | Mitchell Aviation LLC Mitchell, South Dakota |
Standard | 2018-03-19 | ValidFAA registration status code V: Valid registration. All codes |
| N2957Q | Cessna 421A |
Fixed-wing, multi-engine | Generals International INC Red Oak, Texas |
Standard | 2018-01-30 | ValidFAA registration status code V: Valid registration. All codes |
| N418BM | Cessna 421C |
Fixed-wing, multi-engine | Orion Aircraft Holding LLC Rocky Mount, Virginia |
Standard | 2017-10-17 | ValidFAA registration status code V: Valid registration. All codes |
| N299GB | Cessna 421C |
Fixed-wing, multi-engine | Hoodoo LLC Missoula, Montana |
Standard | 2017-03-28 | ValidFAA registration status code V: Valid registration. All codes |
| N420WE | Cessna 421C |
Fixed-wing, multi-engine | Swv Aviation LLC Winter Park, Florida |
Standard | 2017-02-09 | ValidFAA registration status code V: Valid registration. All codes |
| N23RL | Cessna 421C |
Fixed-wing, multi-engine | Caljet INC Van Nuys, California |
Standard | 2017-02-02 | ValidFAA registration status code V: Valid registration. All codes |
| N234MD | Beech T34 MENTOR |
Fixed-wing, single engine | Murphy David F Amsterdam, New York |
Standard | 2017-01-31 | ValidFAA registration status code V: Valid registration. All codes |
| N5554G | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Wisconsin |
Standard | 2016-06-29 | ValidFAA registration status code V: Valid registration. All codes |
| N421HL | Cessna 421C |
Fixed-wing, multi-engine | Dodson International Parts INC Rantoul, Kansas |
Standard | 2016-03-28 | ValidFAA registration status code V: Valid registration. All codes |
| N421YW | Cessna 421C |
Fixed-wing, multi-engine | Trl Aviation LLC Little Rock, Arkansas |
Standard | 2016-03-23 | ValidFAA registration status code V: Valid registration. All codes |
| N421BD | Cessna 421C |
Fixed-wing, multi-engine | 421Bd LLC Arab, Alabama |
Standard | 2016-03-17 | ValidFAA registration status code V: Valid registration. All codes |
| N53MG | Cessna 421C |
Fixed-wing, multi-engine | 28 Lv LLC Las Vegas, Nevada |
Standard | 2015-08-26 | ValidFAA registration status code V: Valid registration. All codes |
| N13HL | Cessna 421B |
Fixed-wing, multi-engine | Freedom 421B LLC Jacksonville, Florida |
Standard | 2015-05-22 | ValidFAA registration status code V: Valid registration. All codes |
| N144ML | Kosco Matthew LANCAIR IV |
Fixed-wing, single engine | Lewis University Romeoville, Illinois |
Experimental | 2015-02-19 | ValidFAA registration status code V: Valid registration. All codes |
| N13PG | Cessna 421C |
Fixed-wing, multi-engine | Co-owned owner California |
Experimental | 2014-11-03 | ValidFAA registration status code V: Valid registration. All codes |
| N850RM | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Ohio |
Standard | 2014-10-30 | ValidFAA registration status code V: Valid registration. All codes |
| N421JM | Cessna 421B |
Fixed-wing, multi-engine | Individual owner California |
Standard | 2014-08-18 | ValidFAA registration status code V: Valid registration. All codes |
| N321HA | Cessna 421B |
Fixed-wing, multi-engine | Skytook LLC Wilmington, Delaware |
Standard | 2014-07-15 | ValidFAA registration status code V: Valid registration. All codes |
| N811PG | Cessna 421C |
Fixed-wing, multi-engine | H&S Aircraft LLC Lewes, Delaware |
Standard | 2013-08-14 | ValidFAA registration status code V: Valid registration. All codes |
| N210GM | Cessna 210L |
Fixed-wing, single engine | Individual owner Oklahoma |
Standard | 2013-07-16 | ValidFAA registration status code V: Valid registration. All codes |
| N21SG | Cessna 421C |
Fixed-wing, multi-engine | Two One Sierra Golf LLC Seattle, Washington |
Standard | 2012-09-18 | ValidFAA registration status code V: Valid registration. All codes |
| N311CA | Cessna 421C |
Fixed-wing, multi-engine | Southern Wings LLC Shreveport, Louisiana |
Standard | 2012-08-07 | ValidFAA registration status code V: Valid registration. All codes |
| N421LL | Cessna 421C |
Fixed-wing, multi-engine | Whirlybird Aviation LLC Bend, Oregon |
Standard | 2012-05-25 | ValidFAA registration status code V: Valid registration. All codes |
| N716RM | Cessna 421B |
Fixed-wing, multi-engine | Mattracks Promotions INC Karlstad, Minnesota |
Standard | 2012-03-09 | ValidFAA registration status code V: Valid registration. All codes |
| N706AA | Cessna 421C |
Fixed-wing, multi-engine | Archer Automotive INC Houston, Texas |
Standard | 2011-05-04 | ValidFAA registration status code V: Valid registration. All codes |
| N28RH | Cessna 421C |
Fixed-wing, multi-engine | National Airplane Sales & Leasing CORP Lima, Ohio |
Standard | 2011-04-12 | ValidFAA registration status code V: Valid registration. All codes |
| N942SW | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 2011-01-27 | ValidFAA registration status code V: Valid registration. All codes |
| N818AK | Cessna 421C |
Fixed-wing, multi-engine | Individual owner California |
Standard | 2008-09-24 | ValidFAA registration status code V: Valid registration. All codes |
| N355RT | Cessna 421B |
Fixed-wing, multi-engine | Beechwood Aviation LLC Wilmington, Delaware |
Standard | 2008-05-12 | ValidFAA registration status code V: Valid registration. All codes |
| N421GS | Cessna 421C |
Fixed-wing, multi-engine | Starlight Aviation LLC Houston, Texas |
Standard | 2007-01-31 | ValidFAA registration status code V: Valid registration. All codes |
| N423TM | Cessna 421C |
Fixed-wing, multi-engine | Jp Aviation Leasing LLC Salt Lake City, Utah |
Standard | 2006-05-03 | ValidFAA registration status code V: Valid registration. All codes |
| N622TR | Cessna 421C |
Fixed-wing, multi-engine | L C A INC Alamo, California |
Standard | 2006-02-01 | ValidFAA registration status code V: Valid registration. All codes |
| N421WN | Cessna 421C |
Fixed-wing, multi-engine | Contractors Flight Service LLC La Jolla, California |
Standard | 2005-12-12 | ValidFAA registration status code V: Valid registration. All codes |
| N421LY | Cessna 421C |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 2005-05-18 | ValidFAA registration status code V: Valid registration. All codes |
| N505LT | Cessna 421C |
Fixed-wing, multi-engine | Laufer Air INC Hartford, Wisconsin |
Standard | 2005-02-15 | ValidFAA registration status code V: Valid registration. All codes |
| N715DT | Cessna 305A |
Fixed-wing, single engine | Individual owner New Jersey |
Standard | 2002-05-06 | ValidFAA registration status code V: Valid registration. All codes |
| N124TM | Cessna 421C |
Fixed-wing, multi-engine | Universal Aviation LLC Decatur, Arkansas |
Standard | ValidFAA registration status code V: Valid registration. All codes | |
| N421EE | Cessna 421C |
Fixed-wing, multi-engine | Bas Part Sales LLC Greeley, Colorado |
Standard | ValidFAA registration status code V: Valid registration. All codes | |
| N421HP | Cessna 421C |
Fixed-wing, multi-engine | Dodson International Parts INC Rantoul, Kansas |
Standard | ValidFAA registration status code V: Valid registration. All codes | |
| N421WB | Cessna 421C |
Fixed-wing, multi-engine | Bas Part Sales LLC Greeley, Colorado |
Standard | ValidFAA registration status code V: Valid registration. All codes | |
| N43BM | Cessna 421C |
Fixed-wing, multi-engine | Dodson International Parts INC Rantoul, Kansas |
Standard | ValidFAA registration status code V: Valid registration. All codes | |
| N518B | Cessna 421B |
Fixed-wing, multi-engine | Bas Part Sales LLC Greeley, Colorado |
Standard | ValidFAA registration status code V: Valid registration. All codes | |
| N628RJ | Cessna 421B |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 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.