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
N5318V	Cessna 210L	Fixed-wing, single engine	Individual owner Texas	Standard	2019-12-10	Valid
N744UJ	Beech D55	Fixed-wing, multi-engine	Approach Aviation LLC Marion, Ohio	Standard	2019-12-09	Valid
N136GB	Beech V35	Fixed-wing, single engine	Individual owner Mississippi	Standard	2019-12-06	Valid
N4322W	Beech V35B	Fixed-wing, single engine	Individual owner California	Standard	2019-12-06	Valid
N789R	Beech S35	Fixed-wing, single engine	Co-owned owner Illinois	Standard	2019-12-06	Valid
N9268Q	Beech A36	Fixed-wing, single engine	Co-owned owner South Carolina	Standard	2019-12-05	Valid
N7927R	Beech E33C	Fixed-wing, single engine	N7927R LLC Columbia Falls, Montana	Standard	2019-12-04	Valid
N4106S	Beech F33A	Fixed-wing, single engine	Compnet Solutions INC Dallas, Texas	Standard	2019-12-03	Valid
N220HD	Cessna 310R	Fixed-wing, multi-engine	Ace Transport Service INC Wilmington, Delaware	Standard	2019-12-02	Valid
N252DL	Cessna 310R	Fixed-wing, multi-engine	Plac Holdings LLC Paradise, Texas	Standard	2019-12-02	Valid
N19EC	Cessna A185E	Fixed-wing, single engine	Individual owner Washington	Standard	2019-11-27	Valid
N310TS	Cessna 310R	Fixed-wing, multi-engine	Pro Aire Cargo & Consulting INC Oshkosh, Wisconsin	Standard	2019-11-27	Valid
N7310V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Missouri	Standard	2019-11-27	Valid
N780SH	Cessna 310R	Fixed-wing, multi-engine	Pro Aire Cargo & Consulting INC Oshkosh, Wisconsin	Standard	2019-11-27	Valid
N9996V	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Texas	Standard	2019-11-27	Valid
N29059	Cessna U206C	Fixed-wing, single engine	Ens Aviation LLC Marshall, Texas	Standard	2019-11-26	Valid
N6216V	Beech V35	Fixed-wing, single engine	Individual owner California	Standard	2019-11-26	Valid
N20292	Beech 58	Fixed-wing, multi-engine	Laflight LLC Goldsboro, North Carolina	Standard	2019-11-25	Valid
N3739Y	Cessna 210D	Fixed-wing, single engine	Cessna 210 LLC Ogden, Utah	Standard	2019-11-25	Valid
N4559M	Beech A36	Fixed-wing, single engine	Sky High Ventures LLC Bartlett, Tennessee	Standard	2019-11-25	Valid
N6278V	Beech V35A	Fixed-wing, single engine	Montana Excursions LLC Modesto, California	Standard	2019-11-25	Valid
N755X	Beech V35	Fixed-wing, single engine	Individual owner Texas	Standard	2019-11-25	Valid
N9582E	Bellanca 17-30A	Fixed-wing, single engine	Dsm Aviation Financing LLC Dallas, Texas	Standard	2019-11-25	Valid
N2047B	Beech A36	Fixed-wing, single engine	Field Inspection LLC Brawley, California	Standard	2019-11-21	Valid
N3715B	Beech 58	Fixed-wing, multi-engine	Bombers and Barons LLC Haughton, Louisiana	Standard	2019-11-20	Valid
N654AJ	Beech S35	Fixed-wing, single engine	Vintage Wings Aircraft LLC Center Point, Indiana	Standard	2019-11-20	Valid
N8995M	Beech S35	Fixed-wing, single engine	Individual owner Arizona	Standard	2019-11-20	Valid
N2550S	Cessna 210L	Fixed-wing, single engine	Individual owner California	Standard	2019-11-19	Valid
N38DK	Beech S35	Fixed-wing, single engine	Individual owner California	Standard	2019-11-19	Valid
N6065S	Beech F33A	Fixed-wing, single engine	Edwards Aviation LLC Fresno, California	Standard	2019-11-19	Valid
N6690G	Beech A36	Fixed-wing, single engine	Key Lime Real Estate INC Lutz, Florida	Standard	2019-11-19	Valid
N773P	Cessna U206	Fixed-wing, single engine	Air Data Solutions LLC Natchitoches, Louisiana	Standard	2019-11-19	Valid
N8299G	Beech F33A	Fixed-wing, single engine	Individual owner Massachusetts	Standard	2019-11-19	Valid
N6749G	Beech A36	Fixed-wing, single engine	Lesh Air LLC Denver, Colorado	Standard	2019-11-18	Valid
N66LC	Beech A36	Fixed-wing, single engine	Business Jet Consultants LLC Derby, Kansas	Standard	2019-11-15	Valid
N911G	Beech V35	Fixed-wing, single engine	Individual owner Texas	Standard	2019-11-14	Valid
N550X	Beech V35B	Fixed-wing, single engine	550X LLC Tucson, Arizona	Standard	2019-11-13	Valid
N9513G	Cessna U206F	Fixed-wing, single engine	Individual owner Idaho	Standard	2019-11-13	Valid
N1467F	Cessna A185F	Fixed-wing, single engine	Jetceo LLC Kalispell, Montana	Standard	2019-11-12	Valid
N1800V	Beech A36	Fixed-wing, single engine	Withheld at owner's request	Standard	2019-11-12	Valid
N615AG	Beech F33A	Fixed-wing, single engine	Individual owner Maryland	Standard	2019-11-12	Valid
N8047K	Beech F33A	Fixed-wing, single engine	Van Dinter Mike Post Falls, Idaho	Standard	2019-11-12	Valid
N61323	Cessna A185F	Fixed-wing, single engine	N61323 LLC Portland, Oregon	Standard	2019-11-08	Valid
N66TC	Beech V35	Fixed-wing, single engine	Co-owned owner Georgia	Standard	2019-11-08	Valid
N756YS	Cessna U206G	Fixed-wing, single engine	Shoreline Consulting Bryan, Texas	Standard	2019-11-08	Valid
N707WG	Beech 36	Fixed-wing, single engine	Withheld at owner's request	Standard	2019-11-07	Valid
N13PK	Cessna 310R	Fixed-wing, multi-engine	Oaks Aviation LLC Clear Lake, Minnesota	Standard	2019-11-06	Valid
N1493M	Cessna U206E	Fixed-wing, single engine	Individual owner Alaska	Standard	2019-11-05	Valid
N234WB	Beech V35A	Fixed-wing, single engine	Individual owner California	Standard	2019-11-05	Valid
N14680	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Texas	Standard	2019-11-04	Valid
N4376R	Beech E33C	Fixed-wing, single engine	Individual owner Alabama	Standard	2019-11-04	Valid
N7916R	Beech 36	Fixed-wing, single engine	Individual owner Texas	Standard	2019-10-31	Valid
N9310Q	Beech 58	Fixed-wing, multi-engine	Mc Types II LLC Jacksonville, Florida	Standard	2019-10-30	Valid
N1593L	Beech F33A	Fixed-wing, single engine	Co-owned owner Michigan	Standard	2019-10-29	Valid
N8061Z	Cessna U206A	Fixed-wing, single engine	Individual owner Washington	Standard	2019-10-29	Valid
N186Q	Beech S35	Fixed-wing, single engine	Executive Bonanza Group Sacramento, California	Standard	2019-10-25	Valid
N7781R	Beech D55	Fixed-wing, multi-engine	Voler Exupery LLC Lewes, Delaware	Standard	2019-10-25	Valid
N905V	Beech V35B	Fixed-wing, single engine	Individual owner New Mexico	Standard	2019-10-25	Valid
N1279G	Cessna 310Q	Fixed-wing, multi-engine	Hodgman Gary W Greenville, Texas	Standard	2019-10-22	Valid
N3740Y	Cessna 210	Fixed-wing, single engine	Omg Air LLC Okeechobee, Florida	Standard	2019-10-22	Valid
N6032M	Beech F33A	Fixed-wing, single engine	Hbb INC Birmingham, Alabama	Standard	2019-10-22	Valid
N2WD	Navion NAVION B	Fixed-wing, single engine	Individual owner Kansas	Standard	2019-10-21	Valid
N6648N	Beech V35B	Fixed-wing, single engine	Mark & David LLC Coldwater, Mississippi	Standard	2019-10-21	Valid
N136RL	Beech A36	Fixed-wing, single engine	Withheld at owner's request	Standard	2019-10-18	Valid
N335TC	Beech V35	Fixed-wing, single engine	Co-owned owner Oregon	Standard	2019-10-16	Valid
N3742Q	Beech 35-C33A	Fixed-wing, single engine	Individual owner Georgia	Standard	2019-10-16	Valid
N5609S	Beech F33A	Fixed-wing, single engine	Simply Living LLC Fort Myers, Florida	Standard	2019-10-15	Valid
N1569U	Cessna U206F	Fixed-wing, single engine	Individual owner Indiana	Standard	2019-10-11	Valid
N1697W	Beech A36	Fixed-wing, single engine	Mountcastle Creek LLC Pratt, Kansas	Standard	2019-10-11	Valid
N3351S	Cessna 210J	Fixed-wing, single engine	Co-owned owner California	Standard	2019-10-11	Valid
N176W	Beech A36	Fixed-wing, single engine	Co-owned owner Michigan	Standard	2019-10-10	Valid
N7807R	Beech V35A	Fixed-wing, single engine	Individual owner Arizona	Standard	2019-10-10	Valid
N4831J	Beech V35	Fixed-wing, single engine	Individual owner Ohio	Standard	2019-10-09	Valid
N185BJ	Cessna A185F	Fixed-wing, single engine	Individual owner Montana	Standard	2019-10-08	Valid
N36D	Navion NAVION B	Fixed-wing, single engine	Summer Winds II LLC Lafayette, Indiana	Standard	2019-10-08	Valid
N38SS	Beech A36	Fixed-wing, single engine	Kane of the Upstate Greenville, South Carolina	Standard	2019-10-08	Valid
N455K	Beech V35	Fixed-wing, single engine	Co-owned owner New Jersey	Standard	2019-10-08	Valid
N800EE	Beech V35B	Fixed-wing, single engine	Individual owner California	Standard	2019-10-07	Valid
N8483N	Beech V35A	Fixed-wing, single engine	Co-owned owner Oklahoma	Standard	2019-10-07	Valid
N10BD	Cessna 310R	Fixed-wing, multi-engine	Individual owner Texas	Standard	2019-10-03	Valid
N333JP	Beech V35	Fixed-wing, single engine	Co-owned owner Florida	Standard	2019-10-03	Valid
N185AJ	Cessna A185F	Fixed-wing, single engine	Individual owner Texas	Standard	2019-10-02	Valid
N1WF	Beech V35A	Fixed-wing, single engine	Withheld at owner's request	Standard	2019-10-02	Valid
N8207R	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Kansas	Standard	2019-10-02	Valid
N828DS	Beech A36	Fixed-wing, single engine	Co-owned owner Arizona	Standard	2019-10-01	Valid
N2792J	Cessna A185E	Fixed-wing, single engine	Co-owned owner Alaska	Multiple	2019-09-30	Valid
N444CC	Beech F33A	Fixed-wing, single engine	Co-owned owner Tennessee	Standard	2019-09-27	Valid
N6267X	Beech V35B	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2019-09-27	Valid
N9053Q	Beech V35B	Fixed-wing, single engine	Orville Ventures LLC Leawood, Kansas	Standard	2019-09-27	Valid
N4459S	Beech A36	Fixed-wing, single engine	Co-owned owner Texas	Standard	2019-09-26	Valid
N4918Y	Cessna 210N	Fixed-wing, single engine	Grathwohl Air LLC Bloomfield Hills, Michigan	Standard	2019-09-25	Valid
N1517U	Cessna 207	Fixed-wing, single engine	N1517U LLC Mequon, Wisconsin	Standard	2019-09-24	Valid
N364VK	Beech A36	Fixed-wing, single engine	Co-owned owner Iowa	Standard	2019-09-24	Valid
N400DP	Cessna 310R	Fixed-wing, multi-engine	Individual owner Texas	Standard	2019-09-24	Valid
N665JT	Beech E-55	Fixed-wing, multi-engine	N665Jt LLC Shoreline, Washington	Standard	2019-09-24	Valid
N12KF	Cessna 210L	Fixed-wing, single engine	N12Kf LLC Pass Christian, Mississippi	Standard	2019-09-23	Valid
N9023S	Beech S35	Fixed-wing, single engine	Two Wings LLC Pierre, South Dakota	Standard	2019-09-23	Valid
N79PR	Beech V35B	Fixed-wing, single engine	Co-owned owner Kansas	Standard	2019-09-20	Valid
N18315	Beech V35B	Fixed-wing, single engine	Co-owned owner South Carolina	Standard	2019-09-19	Valid
N5293X	Cessna U206G	Fixed-wing, single engine	Baker Leasing LLC Kotzebue, Alaska	Restricted	2019-09-19	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