Engines · piston (reciprocating) · data as of October 8, 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

Model families, as a table

	aircraft
Beechcraft V35 Bonanza	1,496
Beechcraft A36 Bonanza	1,145
Cessna A185 Skywagon	1,143
Beechcraft F33 Bonanza	872
Cessna 210 Centurion	767
Cessna U206 Stationair	641
Beechcraft 58 Baron	466
Bellanca 17 Viking	456
Beechcraft S35 Bonanza	439
Cessna 310	303
Cessna A188	230
Beechcraft E-55	193

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

By state, as a table

	aircraft
Texas	1,047
California	791
Alaska	673
Florida	567
Delaware	326
Arizona	312
Montana	276
Washington	274
Colorado	265
Georgia	251

Kind of aircraft

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

By kind, as a table

	aircraft	share
Piston singles	7,845	83%
Piston twins	1,371	14%
Turboprops	268	3%

When the aircraft were built by decade

By decade built, as a table

	aircraft
1940	12
1950	37
1960	2,627
1970	4,534
1980	1,114
1990	189
2000	5
2010	2

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

Failure reports by year, as a table

	reports
95	15
96	2
97	1
98	1
99	5
00	37
01	48
02	58
03	46
04	35
05	62
06	17
07	18
08	17
09	10
10	20
11	15
12	13
13	9
14	10
15	12
16	4
17	2
18	1
19	2
20	2
22	1
24	2

Parts most often reported as the reports name them

Cylinder26Cylinder Head25Relay20Hub14Circuit Breaker13Antenna12Line12Bolt10Bracket9Control Cable9

Parts most reported, as a table

	reports
Cylinder	26
Cylinder Head	25
Relay	20
Hub	14
Circuit Breaker	13
Antenna	12
Line	12
Bolt	10
Bracket	9
Control Cable	9

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

The whole map of how records connect · these connections as data: /graph/engine/continental-io-520-series.json.

Aircraft newest certificates first · 9,484

Tail no.	Maker and model	Group	Owner and base	Certificate	Registered	Status
N6271R	Beech 58	Fixed-wing, multi-engine	Air Jag LLC Garden City, Kansas	Standard	2020-08-03	Valid
N9465G	Cessna U206E	Fixed-wing, single engine	Osprey Air LLC Anchorage, Alaska	Standard	2020-08-03	Valid
N17979	Beech 58	Fixed-wing, multi-engine	Alford Flying LLC Wichita, Kansas	Standard	2020-08-01	Valid
N33KS	Beech F33A	Fixed-wing, single engine	Individual owner Montana	Standard	2020-08-01	Valid
N6731R	Beech V35B	Fixed-wing, single engine	Haidlen Ford INC Oakdale, California	Standard	2020-08-01	Valid
N77KG	Beech F33A	Fixed-wing, single engine	Individual owner Florida	Standard	2020-08-01	Valid
N90MW	Cessna A185F	Fixed-wing, single engine	Individual owner Michigan	Standard	2020-08-01	Valid
N75BK	Beech F33A	Fixed-wing, single engine	N75Bk LLC Midland, Texas	Standard	2020-07-31	Valid
N3698D	Beech/Goedkerj L A36	Fixed-wing, single engine	98D Aviation LLC Dyersburg, Tennessee	Standard	2020-07-30	Valid
N638S	Beech 35-C33A	Fixed-wing, single engine	Debonair N638S Flying Club LLC Beavercreek, Ohio	Standard	2020-07-30	Valid
N770MV	Cessna 310R	Fixed-wing, multi-engine	Individual owner Indiana	Standard	2020-07-30	Valid
N2346F	Cessna 210E	Fixed-wing, single engine	Navion Holdings LLC Boise, Idaho	Standard	2020-07-28	Valid
N310MH	Cessna 310R	Fixed-wing, multi-engine	Individual owner Florida	Standard	2020-07-27	Valid
N5937F	Cessna 210H	Fixed-wing, single engine	Dodson International Parts INC Rantoul, Kansas	Standard	2020-07-24	Valid
N969RB	Cessna TU206C	Fixed-wing, single engine	K Fortner LLC San Marcos, Texas	Standard	2020-07-24	Valid
N33VH	Beech V35B	Fixed-wing, single engine	Withheld at owner's request	Standard	2020-07-23	Valid
N2119L	Beech 58	Fixed-wing, multi-engine	Individual owner Texas	Standard	2020-07-22	Valid
N17CD	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2020-07-20	Valid
N185YH	Cessna A185F	Fixed-wing, single engine	Individual owner Washington	Standard	2020-07-20	Valid
N9420M	Cessna 210K	Fixed-wing, single engine	Sideline Services LLC Pearland, Texas	Standard	2020-07-20	Valid
N185SJ	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2020-07-16	Valid
N3132W	Beech F33A	Fixed-wing, single engine	Steve Rodemer Esq LLC Colorado Springs, Colorado	Standard	2020-07-16	Valid
N2054N	Beech V35B	Fixed-wing, single engine	Co-owned owner Indiana	Standard	2020-07-15	Valid
N3853J	Beech A36	Fixed-wing, single engine	Individual owner Arizona	Standard	2020-07-13	Valid
N6631S	Beech F33A	Fixed-wing, single engine	Not A Jet Yet LLC Chandler, Arizona	Standard	2020-07-13	Valid
N9434N	Cessna A185F	Fixed-wing, single engine	Individual owner Washington	Standard	2020-07-10	Valid
N6696D	Beech A36	Fixed-wing, single engine	Mayfly Aviation LLC Quincy, Florida	Standard	2020-07-09	Valid
N158TB	Beech 58	Fixed-wing, multi-engine	Individual owner Florida	Standard	2020-07-08	Valid
N503MD	Cessna 206	Fixed-wing, single engine	Individual owner Alaska	Standard	2020-07-08	Valid
N72MB	Beech A36	Fixed-wing, single engine	Individual owner Minnesota	Standard	2020-07-08	Valid
N947ET	Cessna U206F	Fixed-wing, single engine	Granite State Aerial Topography LLC Wolfeboro, New Hampshire	Standard	2020-07-08	Valid
N1804W	Beech E-55	Fixed-wing, multi-engine	Individual owner Michigan	Standard	2020-07-07	Valid
N185MF	Cessna A185F	Fixed-wing, single engine	Jb of Tower LLC Tower, Minnesota	Standard	2020-07-07	Valid
N2090L	Beech V35B	Fixed-wing, single engine	Individual owner Arkansas	Standard	2020-07-07	Valid
N235SE	Beech A36	Fixed-wing, single engine	Plane Flt LLC Broken Arrow, Oklahoma	Standard	2020-07-07	Valid
N6146M	Beech A36	Fixed-wing, single engine	Bluewater Na LLC San Diego, California	Standard	2020-07-07	Valid
N6288V	Beech D55	Fixed-wing, multi-engine	Jaysix LLC Greeley, Colorado	Special flight permit	2020-07-07	Valid
N8285L	Beech F33A	Fixed-wing, single engine	Gilbran Properties LLC Oklahoma City, Oklahoma	Standard	2020-07-07	Valid
N1834S	Beech A36	Fixed-wing, single engine	Millan Person Aircraft INC Austin, Texas	Standard	2020-07-06	Valid
N1YR	Beech V35B	Fixed-wing, single engine	Co-owned owner Iowa	Standard	2020-07-06	Valid
N368V	Beech 36	Fixed-wing, single engine	Individual owner Minnesota	Standard	2020-07-06	Valid
N4723F	Cessna P206B	Fixed-wing, single engine	Straightin LLC Paauilo, Hawaii	Standard	2020-07-06	Valid
N5797K	Beech S35	Fixed-wing, single engine	Bank of Utah Trustee Salt Lake City, Utah	Standard	2020-07-06	Valid
N6163U	Cessna U206G	Fixed-wing, single engine	Individual owner Alaska	Standard	2020-07-06	Valid
N1598H	Cessna A185F	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2020-07-01	Valid
N200SP	Beech D55	Fixed-wing, multi-engine	N200Sp LLC Erie, Colorado	Standard	2020-07-01	Valid
N58502	Cessna U206F	Fixed-wing, single engine	H e Fly Float LLC Virginia Beach, Virginia	Standard	2020-07-01	Valid
N77BJ	Beech V35B	Fixed-wing, single engine	Individual owner New York	Standard	2020-07-01	Valid
N8788Q	Cessna U206F	Fixed-wing, single engine	Individual owner Alaska	Standard	2020-07-01	Valid
N93183	Cessna A185F	Fixed-wing, single engine	Co-owned owner Alaska	Restricted	2020-07-01	Valid
N166CC	Beech B-45	Fixed-wing, single engine	Valkyrie Aero LLC Mesa, Arizona	Standard	2020-06-30	Valid
N206GT	Cessna P206B	Fixed-wing, single engine	Individual owner Utah	Standard	2020-06-30	Valid
N29204	Cessna U206C	Fixed-wing, single engine	Jms Aviation LLC Waynesville, Ohio	Standard	2020-06-30	Valid
N4046B	Bellanca 17-30A	Fixed-wing, single engine	Co-owned owner Oregon	Standard	2020-06-30	Valid
N42JV	Beech F33A	Fixed-wing, single engine	Individual owner Louisiana	Standard	2020-06-30	Valid
N5546F	Beech F33A	Fixed-wing, single engine	Ce-1382 LLC Point Clear, Alabama	Standard	2020-06-30	Valid
N74TG	Beech 36	Fixed-wing, single engine	Lf Operations LLC N74Tg Series Coalgate, Oklahoma	Standard	2020-06-26	Valid
N48TX	Beech 58	Fixed-wing, multi-engine	Culater LLC Indianapolis, Indiana	Standard	2020-06-25	Valid
N5601S	Beech V35	Fixed-wing, single engine	Arno Aero LLC Merton, Wisconsin	Standard	2020-06-25	Valid
N5635S	Beech V35	Fixed-wing, single engine	Co-owned owner Missouri	Standard	2020-06-25	Valid
N477WC	Beech A36	Fixed-wing, single engine	Allison Medical Solutions LLC Lumberton, Mississippi	Standard	2020-06-24	Valid
N567DB	Cessna 210E	Fixed-wing, single engine	Gardner Law Firm Pllc Shawnee, Oklahoma	Standard	2020-06-24	Valid
N1667M	Cessna A185E	Fixed-wing, single engine	Ten Mile Ranch INC Vale, Oregon	Standard	2020-06-23	Valid
N3130Q	Cessna A185F	Fixed-wing, single engine	Individual owner Minnesota	Standard	2020-06-23	Valid
N4197C	Cessna 414	Fixed-wing, multi-engine	All In Aviation LLC Townville, South Carolina	Standard	2020-06-23	Valid
N114AM	Cessna 310R	Fixed-wing, multi-engine	Lon Air LLC Longwood, Florida	Standard	2020-06-22	Valid
N185AH	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2020-06-22	Valid
N1818Y	Beech A36	Fixed-wing, single engine	Individual owner New York	Standard	2020-06-19	Valid
N9BM	Beech D-45	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2020-06-18	Valid
N30819	Beech F33A	Fixed-wing, single engine	Individual owner Texas	Standard	2020-06-16	Valid
N7957R	Beech V35A	Fixed-wing, single engine	Individual owner New Jersey	Standard	2020-06-16	Valid
N1723B	Cessna U206G	Fixed-wing, single engine	Individual owner Florida	Standard	2020-06-15	Valid
N22ZV	Beech A36	Fixed-wing, single engine	2 Blondes On Board LLC Brenham, Texas	Standard	2020-06-15	Valid
N93675	Bellanca 17-30A	Fixed-wing, single engine	Rose Gary A Brighton, Tennessee	Standard	2020-06-15	Valid
N118CM	Beech F33A	Fixed-wing, single engine	Eastport Vacation LLC Wilmington, Delaware	Standard	2020-06-11	Valid
N7377H	Cessna A185F	Fixed-wing, single engine	Individual owner Florida	Standard	2020-06-11	Valid
N5737K	Beech S35	Fixed-wing, single engine	Neubauer Accounting LLC Wray, Colorado	Standard	2020-06-10	Valid
N36SS	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2020-06-09	Valid
N4089S	Beech V35B	Fixed-wing, single engine	Raii3 LLC Lewes, Delaware	Standard	2020-06-09	Valid
N581CM	Cessna A185F	Fixed-wing, single engine	Ugashik INC King Salmon, Alaska	Standard	2020-06-09	Valid
N7333V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Texas	Standard	2020-06-05	Valid
N133TD	Beech F33A	Fixed-wing, single engine	Individual owner Massachusetts	Standard	2020-06-04	Valid
N2120F	Cessna U206	Fixed-wing, single engine	Individual owner Alaska	Standard	2020-06-04	Valid
N4321X	Cessna 210E	Fixed-wing, single engine	Grady Auctions & Realty INC Newport, Arkansas	Standard	2020-06-04	Valid
N22097	Beech A36	Fixed-wing, single engine	Crestair Air LLC Dover, Delaware	Standard	2020-06-03	Valid
N287H	Beech S35	Fixed-wing, single engine	Co-owned owner Arkansas	Standard	2020-06-03	Valid
N317CH	Beech V35B	Fixed-wing, single engine	Crestair Air LLC Dover, Delaware	Standard	2020-06-03	Valid
N60519	Beech A36	Fixed-wing, single engine	Co-owned owner Kansas	Standard	2020-06-03	Valid
N7978M	Beech 35-C33A	Fixed-wing, single engine	Withheld at owner's request	Standard	2020-06-03	Valid
N4910U	Cessna 210E	Fixed-wing, single engine	N4910U LLC Cushing, Oklahoma	Standard	2020-06-02	Valid
N9001Q	Beech 58	Fixed-wing, multi-engine	Saransor Properties LLC Eden Prairie, Minnesota	Standard	2020-06-02	Valid
N1860W	Beech V35B	Fixed-wing, single engine	Co-owned owner North Carolina	Standard	2020-06-01	Valid
N598T	Beech V35	Fixed-wing, single engine	Individual owner Minnesota	Standard	2020-06-01	Valid
N4596F	Cessna A185E	Fixed-wing, single engine	Jaysix LLC Greeley, Colorado	Standard	2020-05-29	Valid
N6XS	Cessna A185E	Fixed-wing, single engine	Where On Earth Services INC Saranac Lake, New York	Standard	2020-05-29	Valid
N14691	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Tennessee	Standard	2020-05-27	Valid
N6297L	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2020-05-27	Valid
N727LH	Cessna P206	Fixed-wing, single engine	Co-owned owner Montana	Standard	2020-05-27	Valid
N3830G	Cessna U206B	Fixed-wing, single engine	Aerial Transport LLC Dover, Delaware	Standard	2020-05-26	Valid
N573JC	Cessna A185F	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2020-05-19	Valid

Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 8, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.

	reports
95	15
96	2
97	1
98	1
99	5
00	37
01	48
02	58
03	46
04	35
05	62
06	17
07	18
08	17
09	10
10	20
11	15
12	13
13	9
14	10
15	12
16	4
17	2
18	1
19	2
20	2
22	1
24	2

	reports
95	15
96	2
97	1
98	1
99	5
00	37
01	48
02	58
03	46
04	35
05	62
06	17
07	18
08	17
09	10
10	20
11	15
12	13
13	9
14	10
15	12
16	4
17	2
18	1
19	2
20	2
22	1
24	2

	reports
95	15
96	2
97	1
98	1
99	5
00	37
01	48
02	58
03	46
04	35
05	62
06	17
07	18
08	17
09	10
10	20
11	15
12	13
13	9
14	10
15	12
16	4
17	2
18	1
19	2
20	2
22	1
24	2