Engines · piston (reciprocating) · data as of October 7, 2026

Continental IO-520 series

9,484 aircraft on the U.S. register carry a Continental IO-520 series engine, rated at about 285 horsepower. The Beechcraft V35 Bonanza is the model most often fitted with it (1,496 aircraft). The aircraft carrying it were built between 1963 and 2017.

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 IO-520 series. FAA spelling: IO 520 SERIES.

Fitted to model families

Beechcraft V35 Bonanza1,496Beechcraft A36 Bonanza1,145Cessna A185 Skywagon1,143Beechcraft F33 Bonanza872Cessna 210 Centurion767Cessna U206 Stationair641Beechcraft 58 Baron466Bellanca 17 Viking456Beechcraft S35 Bonanza439Cessna 310303Cessna A188230Beechcraft E-55193

Beechcraft V35 Bonanza · Beechcraft A36 Bonanza · Cessna A185 Skywagon · Beechcraft F33 Bonanza · Cessna 210 Centurion · Cessna U206 Stationair · Beechcraft 58 Baron · Bellanca 17 Viking · Beechcraft S35 Bonanza · Cessna 310

Where they are owner's state

Texas1,047California791Alaska673Florida567Delaware326Arizona312Montana276Washington274Colorado265Georgia251

Kind of aircraft

Piston singles7,845 (83%)Piston twins1,371 (14%)Turboprops268 (3%)

When the aircraft were built by decade

What the FAA has certified, ordered and been told about the Continental IO-520 series the component layer

The design is held under 1 type certificate (E5CE, held by Continental Aerospace Technologies, INC.). The FAA has issued 30 airworthiness directives (orders that owners must comply with) that name this engine series. Operators and repair shops have filed 465 failure reports with the FAA since 1995, 26 of them in the last ten years.

FAA orders 30 airworthiness directives · newest first

2023-10-262023-17-04 · Reciprocating Engine Oil System · engine

2023-03-152023-05-16 · Reciprocating Engine Power Section · engine

2023-02-232023-04-08 · Reciprocating Engine Power Section · engine

2023-02-172023-02-12 · Engine Air Intake System · engine

2022-08-152022-16-03 · Engine (RECIPROCATING) · engine

2022-03-292022-04-04 · Reciprocating Engine Oil System · engine

All orders naming the Continental IO-520 series

Failure reports 465 since · what operators and shops told the FAA

Parts most often reported as the reports name them

Cylinder26Cylinder Head25Relay20Hub14Circuit Breaker13Antenna12Line12Bolt10Bracket9Control Cable9

Latest reports

2024-04-06Engine: power loss

2022-01-21None: none

2020-07-10Rod: broken

2020-01-15Turnbuckle: corroded

Certificates and bulletins

E5CEType certificate held by Continental Aerospace Technologies, INC. · 18 models listed · revised March 8, 2022

Safety bulletins 11 · advice, not orders

2020-04-06NE-20-05 · POWERPLANT - Engine Camshaft Gear Tooth Fracture

2018-06-20NE-18-16 · POWERPLANT Alternator Drive Coupling

2017-05-10NE-17-11 · POWERPLANT Engine damage as a result of kickback

2016-03-08NE-16-13 · Powerplant - Prohibited use of sealant

2013-02-08NE-13-15 · Engine Controls: Continental Motors, Inc. (CMI) Throttle and Mixture Control Levers

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

Beechcraft V35 Bonanza 1,496 with this engine series
Beechcraft A36 Bonanza 1,145 with this engine series
Cessna A185 Skywagon 1,143 with this engine series
Beechcraft F33 Bonanza 872 with this engine series
Cessna 210 Centurion 767 with this engine series
Cessna U206 Stationair 641 with this engine series
Beechcraft 58 Baron 466 with this engine series
Bellanca 17 Viking 456 with this engine series

Where they are

Texas 1,047 of these aircraft
California 791 of these aircraft
Alaska 673 of these aircraft
Florida 567 of these aircraft
Delaware 326 of these aircraft

Biggest operators

Bas Part Sales LLC 27 of these aircraft
International Air Services INC Trustee 12 of these aircraft
Gta Air INC 12 of these aircraft
Southern Aircraft Consultancy INC Trustee 11 of these aircraft
United States Department Of Interior 10 of these aircraft

Airworthiness

FAA orders naming the Continental IO-520 series 30 airworthiness directives
Failure reports on the Continental IO-520 series 465 reports since 1995

Analytics

These connections as data: /graph/engine/continental-io-520-series.json · about the eFlight graph.

Aircraft newest certificates first · 9,484

Tail no.	Maker and model	Group	Owner and base	Certificate	Registered	Status
N1974D	Beech A36	Fixed-wing, single engine	N822Js LLC Norcross, Georgia	Standard	2023-03-03	Valid
N4210B	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Georgia	Standard	2023-03-03	Valid
N4918Q	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2023-03-03	Valid
N732AX	Cessna 210L	Fixed-wing, single engine	Animal Hospital of Fayetteville Pa Fayetteville, North Carolina	Standard	2023-03-03	Valid
N170HP	Beech F33A	Fixed-wing, single engine	Individual owner Utah	Standard	2023-03-02	Valid
N346CB	Cessna 210L	Fixed-wing, single engine	Kombi Brazil INC Fort Lauderdale, Florida	Standard	2023-03-02	Valid
N4163A	Beech V35B	Fixed-wing, single engine	Salida Aviation Partnership Group Moffat, Colorado	Standard	2023-03-02	Valid
N61861	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2023-03-02	Valid
N310XR	Cessna 310R	Fixed-wing, multi-engine	Valiair Limited CO Trustee Casper, Wyoming	Standard	2023-03-01	Valid
N6181Z	Cessna U206G	Fixed-wing, single engine	Individual owner Alaska	Standard	2023-03-01	Valid
N6255B	Beech A36	Fixed-wing, single engine	Rogers Aeronautics LLC Lake Barrington, Illinois	Standard	2023-03-01	Valid
N9415Q	Beech F33A	Fixed-wing, single engine	Co-owned owner California	Standard	2023-02-28	Valid
N95MT	Mchenry Gavin C SUPER CYCLONE	Fixed-wing, single engine	Ts Ibex LTD Bonners Ferry, Idaho	Experimental	2023-02-28	Valid
N17769	Beech A36	Fixed-wing, single engine	Jmk Engineering INC Bloomfield Hills, Michigan	Standard	2023-02-27	Valid
N537D	Beech V35A	Fixed-wing, single engine	Stonebraker Properties LLC Sierra Vista, Arizona	Standard	2023-02-27	Valid
N39CC	Cessna A185F	Fixed-wing, single engine	Individual owner Texas	Standard	2023-02-25	Valid
N8051Z	Cessna U206A	Fixed-wing, single engine	N8051Z LLC Anchorage, Alaska	Standard	2023-02-25	Valid
N333RJ	Beech V35B	Fixed-wing, single engine	Addco Aviation Services INC Newcastle, Oklahoma	Standard	2023-02-24	Valid
N6109X	Cessna 310R	Fixed-wing, multi-engine	Blake Development CORP LLC Fort Lauderdale, Florida	Special flight permit	2023-02-24	Valid
N514T	Cessna U206G	Fixed-wing, single engine	Pactolus Investments LLC Blounts Creek, North Carolina	Standard	2023-02-23	Valid
N636E	Beech A36	Fixed-wing, single engine	Adams Aerial Solutions LLC Decatur, Illinois	Standard	2023-02-23	Valid
N25691	Beech F33A	Fixed-wing, single engine	Individual owner Alabama	Standard	2023-02-22	Valid
N6198U	Beech V35B	Fixed-wing, single engine	Seldom Seen LLC Kalispell, Montana	Standard	2023-02-22	Valid
N216R	Beech A36	Fixed-wing, single engine	Individual owner Georgia	Standard	2023-02-21	Valid
N451SB	Beech 58	Fixed-wing, multi-engine	Individual owner Indiana	Standard	2023-02-21	Valid
N488DP	Beech A36	Fixed-wing, single engine	Individual owner California	Standard	2023-02-21	Valid
N2724J	Cessna A185E	Fixed-wing, single engine	Horseshoe Air LLC Pella, Iowa	Standard	2023-02-20	Valid
N34BR	Beech F33A	Fixed-wing, single engine	Industrial Reports INC Raleigh, North Carolina	Standard	2023-02-20	Valid
N6126R	Cessna T210F	Fixed-wing, single engine	Individual owner Washington	Standard	2023-02-20	Valid
N7761R	Beech V35A	Fixed-wing, single engine	Individual owner North Carolina	Standard	2023-02-20	Valid
N8907Q	Cessna U206G	Fixed-wing, single engine	Burks Excavation CORP Hailey, Idaho	Standard	2023-02-20	Valid
N17751	Beech V35B	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2023-02-18	Valid
N1815D	Beech V35B	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2023-02-18	Valid
N1831R	Cessna A185F	Fixed-wing, single engine	C & D Aviation LLC Brentwood, California	Standard	2023-02-18	Valid
N3927M	Cessna U206G	Fixed-wing, single engine	Individual owner Alaska	Standard	2023-02-18	Valid
N7526N	Beech 36	Fixed-wing, single engine	JR Aircraft LLC Lexington, Kentucky	Standard	2023-02-18	Valid
N135WW	Beech V35	Fixed-wing, single engine	Individual owner Washington	Standard	2023-02-17	Valid
N17650	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2023-02-17	Valid
N301RS	Cessna 210M	Fixed-wing, single engine	2F Trade LLC Collinsville, Texas	Standard	2023-02-17	Valid
N333FU	Cessna U206G	Fixed-wing, single engine	Intricate Bay Operating LLC Iliamna, Alaska	Standard	2023-02-17	Valid
N1274G	Cessna 310R	Fixed-wing, multi-engine	Sol Aerial Surveys LLC Las Vegas, Nevada	Standard	2023-02-16	Valid
N2113L	Beech V35B	Fixed-wing, single engine	Individual owner Nebraska	Standard	2023-02-16	Valid
N2572S	Cessna 210L	Fixed-wing, single engine	Individual owner Texas	Standard	2023-02-16	Valid
N26CR	Cessna 210L	Fixed-wing, single engine	Sim International INC Fort Mill, South Carolina	Standard	2023-02-16	Valid
N38089	Beech 58	Fixed-wing, multi-engine	Individual owner Tennessee	Standard	2023-02-16	Valid
N4165S	Beech E-55	Fixed-wing, multi-engine	5100 Departure LLC Beaufort, North Carolina	Standard	2023-02-16	Valid
N6737D	Beech A36	Fixed-wing, single engine	Marlin Air LLC Dallas, Texas	Standard	2023-02-16	Valid
N7116N	Beech V35A	Fixed-wing, single engine	Individual owner Ohio	Standard	2023-02-16	Valid
N3702Q	Beech V35	Fixed-wing, single engine	Individual owner Arizona	Standard	2023-02-15	Valid
N381CR	Beech A36	Fixed-wing, single engine	Individual owner California	Standard	2023-02-15	Valid
N19WC	Beech V35A	Fixed-wing, single engine	V35A LLC Beacon, New York	Standard	2023-02-14	Valid
N215Q	Beech S35	Fixed-wing, single engine	Individual owner Kansas	Standard	2023-02-14	Valid
N242RC	Beech 58	Fixed-wing, multi-engine	Carrera Aviation LLC Wilmington, Delaware	Standard	2023-02-14	Valid
N4166S	Beech F33A	Fixed-wing, single engine	Co-owned owner North Carolina	Standard	2023-02-14	Valid
N4947Q	Cessna A188B	Fixed-wing, single engine	Davison Aviation LLC Garnett, Kansas	Restricted	2023-02-14	Valid
N6376S	Beech F33A	Fixed-wing, single engine	Individual owner Texas	Standard	2023-02-14	Valid
N8083R	Beech F33A	Fixed-wing, single engine	R and P Air LLC Cimarron, Kansas	Standard	2023-02-14	Valid
N2768J	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Standard	2023-02-13	Valid
N4678F	Cessna P206A	Fixed-wing, single engine	Individual owner Tennessee	Standard	2023-02-13	Valid
N800MR	Beech S35	Fixed-wing, single engine	Individual owner Kansas	Standard	2023-02-13	Valid
N5770K	Beech S35	Fixed-wing, single engine	Co-owned owner Maryland	Standard	2023-02-11	Valid
N6994M	Cessna U206G	Fixed-wing, single engine	Individual owner Tennessee	Standard	2023-02-11	Valid
N7835V	Beech V35B	Fixed-wing, single engine	Individual owner North Carolina	Standard	2023-02-11	Valid
N285WA	Beech S35	Fixed-wing, single engine	N285Wa LLC Carthage, North Carolina	Standard	2023-02-10	Valid
N731VX	Cessna A188B	Fixed-wing, single engine	Goff Bayou LLC Shelby, Mississippi	Restricted	2023-02-10	Valid
N1704U	Cessna 207	Fixed-wing, single engine	Kuspuk School District Aniak, Alaska	Standard	2023-02-09	Valid
N5336Y	Cessna 210N	Fixed-wing, single engine	Blue Sky INC Lone Rock, Iowa	Standard	2023-02-09	Valid
N552WT	Beech D55	Fixed-wing, multi-engine	Co-owned owner Georgia	Standard	2023-02-09	Valid
N114AG	Cessna U206G	Fixed-wing, single engine	Rlc Aviation LLC Ansted, West Virginia	Standard	2023-02-08	Valid
N26370	Cessna 310R	Fixed-wing, multi-engine	Gv Air INC Medford, Oregon	Standard	2023-02-08	Valid
N316DS	Beech 35-C33A	Fixed-wing, single engine	Individual owner Utah	Standard	2023-02-08	Valid
N766S	Beech S35	Fixed-wing, single engine	Individual owner Missouri	Standard	2023-02-08	Valid
N777FH	Beech S35	Fixed-wing, single engine	Short Final LLC Mooresville, North Carolina	Standard	2023-02-08	Valid
N8456Q	Cessna A185F	Fixed-wing, single engine	Happy Wings LLC Erie, Colorado	Multiple	2023-02-08	Valid
N2861W	Beech A36	Fixed-wing, single engine	Austin and Austin INC Stafford, Kansas	Standard	2023-02-07	Valid
N3755Y	Cessna 210D	Fixed-wing, single engine	Cecil Enterprises LLC Gig Harbor, Washington	Standard	2023-02-07	Valid
N4524S	Beech A36	Fixed-wing, single engine	Individual owner Minnesota	Standard	2023-02-07	Valid
N490HP	Beech F33A	Fixed-wing, single engine	Breit Sky Aviation LLC Sioux Falls, South Dakota	Standard	2023-02-07	Valid
N7911R	Beech D55	Fixed-wing, multi-engine	Individual owner Virginia	Standard	2023-02-07	Valid
N59237	Cessna U206F	Fixed-wing, single engine	Individual owner Alaska	Standard	2023-02-06	Valid
N9118Q	Beech V35B	Fixed-wing, single engine	Bonanza Life LLC Urbana, Illinois	Standard	2023-02-06	Valid
N98974	Cessna 310R	Fixed-wing, multi-engine	Individual owner Georgia	Standard	2023-02-06	Valid
N2740A	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2023-02-04	Valid
N999DP	Beech V35B	Fixed-wing, single engine	Robinson Aviation Holdings LLC Houston, Texas	Standard	2023-02-04	Valid
N36KW	Cessna 310R	Fixed-wing, multi-engine	Eastern Aviation Publishing INC Center Harbor, New Hampshire	Standard	2023-02-03	Valid
N7908K	Beech S35	Fixed-wing, single engine	Individual owner California	Standard	2023-02-03	Valid
N9407S	Beech V35	Fixed-wing, single engine	Co-owned owner Texas	Standard	2023-02-02	Valid
N361CW	Beech A36	Fixed-wing, single engine	Ck Aviation LLC Brookhaven, Mississippi	Standard	2023-02-01	Valid
N3671M	Beech A36	Fixed-wing, single engine	Figvam LLC New York, New York	Standard	2023-02-01	Valid
N64LA	Beech 58	Fixed-wing, multi-engine	Hanner Investments LLC Appling, Georgia	Standard	2023-02-01	Valid
N761GN	Cessna 210M	Fixed-wing, single engine	21 - 55 Aviation LLC Pella, Iowa	Standard	2023-02-01	Valid
N375L	Beech A36	Fixed-wing, single engine	Co-owned owner California	Standard	2023-01-31	Valid
N630SU	Beech V35A	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2023-01-31	Valid
N94061	Cessna A185F	Fixed-wing, single engine	Guinn LLC Bothell, Washington	Standard	2023-01-31	Valid
N222DT	Beech V35B	Fixed-wing, single engine	Clipper Sky LLC Las Vegas, Nevada	Standard	2023-01-30	Valid
N35NY	Beech V35B	Fixed-wing, single engine	Individual owner Virginia	Standard	2023-01-30	Valid
N451S	Beech A36	Fixed-wing, single engine	Individual owner Tennessee	Standard	2023-01-30	Valid
N36MY	Beech A36	Fixed-wing, single engine	Rla LLP San Jose, California	Standard	2023-01-29	Valid
N5848K	Beech S35	Fixed-wing, single engine	Individual owner California	Standard	2023-01-29	Valid
N2728T	Beech V35	Fixed-wing, single engine	Milk Ranch LLC Stephenville, Texas	Standard	2023-01-28	Valid

Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 7, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.