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
N4925C	Cessna A185F	Fixed-wing, single engine	Individual owner Maine	Standard	2017-04-18	Valid
N8125F	Cessna 402	Fixed-wing, multi-engine	Individual owner Kansas	Standard	2017-04-18	Valid
N111AW	Beech 58	Fixed-wing, multi-engine	C&A Aviation LLC Mcintyre, Georgia	Standard	2017-04-17	Valid
N3798Q	Beech V35	Fixed-wing, single engine	Martin-Fosters Fuel Service INC Seminole, Oklahoma	Standard	2017-04-17	Valid
N8288M	Cessna 210K	Fixed-wing, single engine	Aircraft Guaranty CORP Trustee Oklahoma City, Oklahoma	Standard	2017-04-14	Valid
N95PN	Beech 58	Fixed-wing, multi-engine	M&B Aviation Services LLC Wilmington, Delaware	Standard	2017-04-13	Valid
N354PF	Beech V35B	Fixed-wing, single engine	Individual owner South Carolina	Standard	2017-04-12	Valid
N456DM	Beech A36	Fixed-wing, single engine	Hnw Aviation LLC Melbourne, Arkansas	Standard	2017-04-12	Valid
N5485E	Cessna A185F	Fixed-wing, single engine	Colorado Parks and Wildlife Grand Junction, Colorado	Standard	2017-04-11	Valid
N7609N	Beech D55	Fixed-wing, multi-engine	Pro X Aviation Services LLC Anderson, Indiana	Standard	2017-04-11	Valid
N71MV	Cessna U206F	Fixed-wing, single engine	Volatile Aero Ventures LLC Boulder City, Nevada	Standard	2017-04-10	Valid
N735MY	Cessna U206G	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2017-04-10	Valid
N8824M	Beech S35	Fixed-wing, single engine	Individual owner AE	Standard	2017-04-06	Valid
N355TA	Cessna U206F	Fixed-wing, single engine	Island Amphibs LLC Fort Lauderdale, Florida	Standard	2017-04-04	Valid
N6753R	Cessna T210F	Fixed-wing, single engine	Individual owner Georgia	Standard	2017-04-04	Valid
N708MA	Beech 58	Fixed-wing, multi-engine	Flying Machines LLC Grand Ledge, Michigan	Standard	2017-04-04	Valid
N466RC	Beech E-55	Fixed-wing, multi-engine	Flight Specific LLC Helena, Montana	Standard	2017-04-03	Valid
N2154Q	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Restricted	2017-03-31	Valid
N93625	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Alabama	Standard	2017-03-29	Valid
N1240A	Beech V35A	Fixed-wing, single engine	Alfa Monkey LLC Wolfforth, Texas	Standard	2017-03-27	Valid
N756FM	Cessna U206G	Fixed-wing, single engine	Tope Transportation CO Wasilla, Alaska	Standard	2017-03-23	Valid
N858NC	Beech 58	Fixed-wing, multi-engine	Ial CORP Lewes, Delaware	Standard	2017-03-22	Valid
N18SG	Cessna 310R	Fixed-wing, multi-engine	Individual owner Arkansas	Standard	2017-03-21	Valid
N40JH	Beech A36	Fixed-wing, single engine	Co-owned owner California	Standard	2017-03-21	Valid
N240M	Beech V35B	Fixed-wing, single engine	Bail Air LLC Port Saint Lucie, Florida	Standard	2017-03-20	Valid
N3715Q	Beech V35	Fixed-wing, single engine	Individual owner New Jersey	Standard	2017-03-20	Valid
N5400V	Cessna 210L	Fixed-wing, single engine	Individual owner Indiana	Standard	2017-03-20	Valid
N95KC	Beech 95-C55	Fixed-wing, multi-engine	Tailwinds Flying LLC Merritt Island, Florida	Standard	2017-03-20	Valid
N723JC	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2017-03-17	Valid
N1559L	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	2017-03-16	Valid
N4994F	Cessna U206B	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2017-03-15	Valid
N5901S	Beech V35	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2017-03-15	Valid
N8269Q	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Restricted	2017-03-15	Valid
N17DC	Beech B35	Fixed-wing, single engine	Co-owned owner California	Standard	2017-03-14	Valid
N12AV	Beech F33A	Fixed-wing, single engine	Co-owned owner Idaho	Standard	2017-03-13	Valid
N135BE	Beech V35B	Fixed-wing, single engine	Jeff Proctor Holding Lc Park City, Utah	Standard	2017-03-13	Valid
N1595U	Cessna U206F	Fixed-wing, single engine	Joiner Aviation LLC Vinemont, Alabama	Standard	2017-03-13	Valid
N21852	Cessna A188B	Fixed-wing, single engine	Individual owner Pennsylvania	Restricted	2017-03-13	Valid
N72091	Cessna A188B	Fixed-wing, single engine	Individual owner Pennsylvania	Multiple	2017-03-13	Valid
N939RL	Cessna 210L	Fixed-wing, single engine	Co-owned owner Illinois	Standard	2017-03-13	Valid
N5561U	Beech F33A	Fixed-wing, single engine	Individual owner Texas	Standard	2017-03-09	Valid
N74BS	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2017-03-09	Valid
N3594A	Beech V35B	Fixed-wing, single engine	Flying Fur Animal Rescue Kintnersville, Pennsylvania	Standard	2017-03-08	Valid
N5732K	Beech S35	Fixed-wing, single engine	Individual owner Texas	Standard	2017-03-08	Valid
N1550N	Beech F33A	Fixed-wing, single engine	Individual owner North Carolina	Standard	2017-03-07	Valid
N113AG	Cessna U206G	Fixed-wing, single engine	Individual owner Florida	Standard	2017-03-02	Valid
N307CF	Cessna 210L	Fixed-wing, single engine	Individual owner Montana	Standard	2017-03-02	Valid
N4165B	Bellanca 17-30A	Fixed-wing, single engine	Good Decision Aviators LLC Noble, Oklahoma	Standard	2017-03-02	Valid
N20307	Beech V35B	Fixed-wing, single engine	N20307 LLC Trabuco Canyon, California	Standard	2017-03-01	Valid
N6672B	Beech A36	Fixed-wing, single engine	Your World INC Draper, Utah	Standard	2017-03-01	Valid
N70253	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Restricted	2017-03-01	Valid
N977KM	Beech S35	Fixed-wing, single engine	Co-owned owner Ohio	Standard	2017-03-01	Valid
N223KM	Beech 58	Fixed-wing, multi-engine	Withrotor Aviation INC Lakeview, Oregon	Standard	2017-02-27	Valid
N28064	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Florida	Standard	2017-02-27	Valid
N9158Q	Beech V35B	Fixed-wing, single engine	Individual owner Illinois	Standard	2017-02-27	Valid
N6024A	Beech V35B	Fixed-wing, single engine	Aerospace Trust Management LLC Trustee Wilmington, Delaware	Standard	2017-02-24	Valid
N1975K	Beech V35B	Fixed-wing, single engine	Fly By Night Management LLC Downers Grove, Illinois	Standard	2017-02-23	Valid
N8WM	Beech A36	Fixed-wing, single engine	Beardog Aviation LLC Saint Augustine, Florida	Standard	2017-02-23	Valid
N210WS	Cessna 210J	Fixed-wing, single engine	Individual owner Florida	Standard	2017-02-17	Valid
N36EL	Beech 36	Fixed-wing, single engine	Rapid Cash LLC Wilmington, Delaware	Standard	2017-02-16	Valid
N2050Y	Beech F33A	Fixed-wing, single engine	Co-owned owner Massachusetts	Standard	2017-02-15	Valid
N861RX	Beech A36	Fixed-wing, single engine	Co-owned owner California	Standard	2017-02-15	Valid
N56ME	Cessna 340A	Fixed-wing, multi-engine	Individual owner Florida	Standard	2017-02-13	Valid
N5856Y	Piper PA-23-250	Fixed-wing, multi-engine	Individual owner Connecticut	Standard	2017-02-13	Valid
N666JB	Cessna A188B	Fixed-wing, single engine	Co-owned owner Kansas	Restricted	2017-02-13	Valid
N9070S	Beech F33A	Fixed-wing, single engine	Individual owner Arkansas	Standard	2017-02-13	Valid
N185CG	Cessna A185F	Fixed-wing, single engine	Bulldawg LLC Byers, Colorado	Standard	2017-02-09	Valid
N22131	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2017-02-07	Valid
N100PZ	Beech 58	Fixed-wing, multi-engine	Aeromotors LLC St James, Missouri	Standard	2017-02-06	Valid
N2024Q	Beech A36	Fixed-wing, single engine	Co-owned owner Washington	Standard	2017-02-06	Valid
N35BM	Beech V35B	Fixed-wing, single engine	Individual owner Washington	Standard	2017-02-06	Valid
N90575	Beech A35	Fixed-wing, single engine	Individual owner Georgia	Standard	2017-02-06	Valid
N34391	Meyers Industries Inc 200B	Fixed-wing, single engine	Individual owner Oregon	Standard	2017-02-03	Valid
N10242	Cessna 210L	Fixed-wing, single engine	Alexander Holding Services INC Newark, Delaware	Standard	2017-02-02	Valid
N10DB	Cessna 210M	Fixed-wing, single engine	Individual owner California	Standard	2017-02-02	Valid
N721NR	Cessna U206G	Fixed-wing, single engine	US Department of the Interior Boise, Idaho	Standard	2017-02-02	Valid
N5233U	Cessna 206	Fixed-wing, single engine	Kenai Gravel Products LLC Salt Lake City, Utah	Standard	2017-02-01	Valid
N9493S	Beech 35-C33A	Fixed-wing, single engine	Individual owner Tennessee	Standard	2017-02-01	Valid
N206TM	Beech A36	Fixed-wing, single engine	Pale Horse LLC Mishawaka, Indiana	Standard	2017-01-31	Valid
N4108S	Beech 58	Fixed-wing, multi-engine	Bto Aviation LLC Eden Prairie, Minnesota	Standard	2017-01-27	Valid
N1601W	Beech V35B	Fixed-wing, single engine	Six Ten Ventures LLC Grand Prairie, Texas	Standard	2017-01-26	Valid
N74CF	Cessna A185F	Fixed-wing, single engine	Wincar Air LLC Doniphan, Nebraska	Standard	2017-01-26	Valid
N3948Y	Cessna 210D	Fixed-wing, single engine	Swine Management Service INC Long Island, Kansas	Standard	2017-01-23	Valid
N211TC	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Multiple	2017-01-18	Valid
N2554T	Navion NAVION H	Fixed-wing, single engine	Alvion LLC Unionville, Indiana	Standard	2017-01-17	Valid
N761KE	Cessna 210M	Fixed-wing, single engine	Downstown Airport INC Vineland, New Jersey	Standard	2017-01-17	Valid
N8158R	Beech V35B	Fixed-wing, single engine	Fullerton Vtail Partners LLC Mission Viejo, California	Standard	2017-01-17	Valid
N956V	Beech V35B	Fixed-wing, single engine	Parker Aerospace LLC Warren, Vermont	Standard	2017-01-17	Valid
N4551S	Beech F33A	Fixed-wing, single engine	Aak Enterprises LLC Fayetteville, Arkansas	Standard	2017-01-13	Valid
N111BL	Cessna A185F	Fixed-wing, single engine	Individual owner Texas	Standard	2017-01-12	Valid
N28010	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Oregon	Standard	2017-01-11	Valid
N2759T	Beech V35	Fixed-wing, single engine	Individual owner Arizona	Standard	2017-01-10	Valid
N3851L	Beech A36	Fixed-wing, single engine	Freedom Aviation of NE Florida LLC Jacksonville, Florida	Standard	2017-01-10	Valid
N39876	Bellanca 17-30A	Fixed-wing, single engine	Individual owner California	Experimental	2017-01-10	Valid
N9111Q	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	2017-01-09	Valid
N1833Q	Beech F33A	Fixed-wing, single engine	Itb 10721 LLC Edmonds, Washington	Standard	2017-01-05	Valid
N197R	Beech A36	Fixed-wing, single engine	Co-owned owner Texas	Standard	2017-01-05	Valid
N8284F	Beech F33A	Fixed-wing, single engine	Individual owner Nevada	Standard	2017-01-04	Valid
N185AR	Cessna A185E	Fixed-wing, single engine	Wattum Investments LLC Kodiak, Alaska	Standard	2017-01-03	Valid
N2075W	Beech V35	Fixed-wing, single engine	Individual owner Alaska	Standard	2017-01-03	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