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
N66182	Cessna 180K	Fixed-wing, single engine	Naples Seaplane Adventures LLC Denmark, Maine	Restricted	2014-07-14	Valid
N1844L	Beech V35B	Fixed-wing, single engine	Rao Enterprises LLC Brighton, Michigan	Standard	2014-07-11	Valid
N1858L	Beech F33A	Fixed-wing, single engine	Aircraft Guaranty CORP Trustee Oklahoma City, Oklahoma	Standard	2014-07-10	Valid
N9890M	Cessna 210M	Fixed-wing, single engine	R & R Brown INC Sun Valley, Idaho	Standard	2014-07-10	Valid
N21JP	Beech E-55	Fixed-wing, multi-engine	Dmmag LLC Windermere, Florida	Standard	2014-07-09	Valid
N1515W	Beech 58	Fixed-wing, multi-engine	Centurionair LLC Greenville, South Carolina	Restricted	2014-07-08	Valid
N4730Q	Cessna A185E	Fixed-wing, single engine	Individual owner Wyoming	Multiple	2014-07-08	Valid
N78GW	Beech A36	Fixed-wing, single engine	Cbs Aviation LLC Jackson, Mississippi	Standard	2014-07-07	Valid
N8786Z	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Restricted	2014-07-07	Valid
N4000W	Beech E-55	Fixed-wing, multi-engine	N4000W LLC Prescott, Arizona	Standard	2014-07-03	Valid
N21546	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2014-07-02	Valid
N8907U	Beech S35	Fixed-wing, single engine	Individual owner Oregon	Standard	2014-07-02	Valid
N28129	Bellanca 17-30A	Fixed-wing, single engine	Niles Aviation of Kansas LLC Arkansas City, Kansas	Standard	2014-06-27	Valid
N4594E	Cessna A185F	Fixed-wing, single engine	Individual owner Arkansas	Standard	2014-06-26	Valid
N806T	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2014-06-25	Valid
N89ED	Beech A36	Fixed-wing, single engine	Individual owner North Carolina	Standard	2014-06-25	Valid
N100KW	Beech V35B	Fixed-wing, single engine	Individual owner New Jersey	Standard	2014-06-24	Valid
N2073W	Beech V35	Fixed-wing, single engine	Individual owner North Carolina	Standard	2014-06-24	Valid
N2351F	Cessna 210E	Fixed-wing, single engine	Individual owner Arkansas	Standard	2014-06-24	Valid
N3049A	Beech F33A	Fixed-wing, single engine	Presidential Aviation LLC Bakersfield, California	Standard	2014-06-24	Valid
N4516S	Beech E-55	Fixed-wing, multi-engine	Individual owner Florida	Standard	2014-06-24	Valid
N8277G	Cessna A188B	Fixed-wing, single engine	Country Aero LLC Darwin, Minnesota	Restricted	2014-06-24	Valid
N85LC	Cessna A185F	Fixed-wing, single engine	Coyote Air LLC Fairbanks, Alaska	Multiple	2014-06-24	Valid
N9465Q	Beech V35B	Fixed-wing, single engine	Maydew Aircraft LLC Dallas, Texas	Standard	2014-06-24	Valid
N4127S	Beech V35B	Fixed-wing, single engine	Individual owner South Dakota	Standard	2014-06-23	Valid
N1157T	Beech A36	Fixed-wing, single engine	Co-owned owner Maryland	Standard	2014-06-19	Valid
N24AG	Beech V35B	Fixed-wing, single engine	Aegis Air LLC Columbia City, Indiana	Standard	2014-06-19	Valid
N98943	Cessna 310R	Fixed-wing, multi-engine	Individual owner Texas	Standard	2014-06-19	Valid
N5120V	Cessna 210L	Fixed-wing, single engine	Treaster Implement CO INC Beloit, Kansas	Standard	2014-06-18	Valid
N735LS	Cessna U206G	Fixed-wing, single engine	Individual owner Idaho	Multiple	2014-06-18	Valid
N71HZ	Beech S35	Fixed-wing, single engine	Individual owner Texas	Standard	2014-06-16	Valid
N7FH	Beech A36	Fixed-wing, single engine	Individual owner Michigan	Standard	2014-06-16	Valid
N999SG	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2014-06-13	Valid
N210MM	Cessna 210K	Fixed-wing, single engine	Marble Aviation LLC Ball Ground, Georgia	Standard	2014-06-12	Valid
N6500	Beech D55	Fixed-wing, multi-engine	Standard Equipment Leasing and Sales LLC Wilmington, Delaware	Standard	2014-06-12	Valid
N8514Q	Cessna U206F	Fixed-wing, single engine	Individual owner Massachusetts	Standard	2014-06-12	Valid
N155JW	Beech V35B	Fixed-wing, single engine	Tcpb LLC Lewes, Delaware	Standard	2014-06-11	Valid
N77VK	Beech A36	Fixed-wing, single engine	Pontiac Flying LLC Pontiac, Illinois	Standard	2014-06-11	Valid
N8227R	Bellanca 17-30A	Fixed-wing, single engine	Individual owner North Carolina	Standard	2014-06-11	Valid
N9049G	Cessna U206G	Fixed-wing, single engine	Smokey Bay Air INC Homer, Alaska	Standard	2014-06-10	Valid
N29061	Cessna U206C	Fixed-wing, single engine	Co-owned owner Alaska	Multiple	2014-06-09	Valid
N66919	Beech A36	Fixed-wing, single engine	Gta Air INC Addison, Texas	Standard	2014-06-09	Valid
N4232Q	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Restricted	2014-06-06	Valid
N26BR	Beech A36	Fixed-wing, single engine	Stender Aviation B LLC Huntsville, Alabama	Standard	2014-06-04	Valid
N4658F	Cessna P206A	Fixed-wing, single engine	Individual owner Nevada	Standard	2014-06-03	Valid
N756CT	Cessna U206G	Fixed-wing, single engine	Individual owner Alaska	Standard	2014-06-02	Valid
N84K	Beech V35B	Fixed-wing, single engine	N84K LLC The Dalles, Oregon	Standard	2014-06-02	Valid
N62GB	Beech V35	Fixed-wing, single engine	Individual owner Texas	Standard	2014-05-31	Valid
N7548N	Beech 36	Fixed-wing, single engine	Individual owner Wyoming	Standard	2014-05-30	Valid
N206EJ	Cessna U206F	Fixed-wing, single engine	Individual owner Alaska	Standard	2014-05-28	Valid
N9216Q	Beech V35B	Fixed-wing, single engine	Osage Aviation LLC Yates Center, Kansas	Standard	2014-05-28	Valid
N9058Q	Beech 58	Fixed-wing, multi-engine	Individual owner Texas	Standard	2014-05-27	Valid
N2373F	Cessna 210E	Fixed-wing, single engine	Rlo Aviation LLC Double Springs, Alabama	Standard	2014-05-23	Valid
N3032W	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2014-05-23	Valid
N6133G	Cessna A188B	Fixed-wing, single engine	Rosebud Aviation Gregory, South Dakota	Restricted	2014-05-23	Valid
N285HA	Beech 58	Fixed-wing, multi-engine	Blacqjacq Aviation CO Wilmington, Delaware	Standard	2014-05-22	Valid
N58PT	Beech V35A	Fixed-wing, single engine	Individual owner New Jersey	Standard	2014-05-22	Valid
N6181C	Cessna 310R	Fixed-wing, multi-engine	6181C LLC Saginaw, Michigan	Standard	2014-05-22	Valid
N9466Q	Beech 58	Fixed-wing, multi-engine	Lan Dale CO Reno, Nevada	Standard	2014-05-22	Valid
N129LP	Cessna A185F	Fixed-wing, single engine	Jag Aviation LLC Belle Chasse, Louisiana	Standard	2014-05-21	Valid
N1656X	Cessna 210L	Fixed-wing, single engine	Individual owner Georgia	Standard	2014-05-19	Valid
N1089F	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2014-05-15	Valid
N2186F	Cessna U206	Fixed-wing, single engine	Individual owner Alaska	Standard	2014-05-14	Valid
N1069W	Beech A36	Fixed-wing, single engine	Elk Lake Group INC Plymouth, Minnesota	Standard	2014-05-13	Valid
N8834M	Beech S35	Fixed-wing, single engine	Pilots Discretion LLC Atlanta, Georgia	Standard	2014-05-13	Valid
N7723M	Cessna T210H	Fixed-wing, single engine	Ddw INC Gardner, Colorado	Standard	2014-05-09	Valid
N5058U	Cessna 206	Fixed-wing, single engine	Skyler Aviation INC San Diego, California	Standard	2014-05-08	Valid
N4220Q	Cessna A185F	Fixed-wing, single engine	Whitefish Aero Services LLC Crosslake, Minnesota	Standard	2014-05-07	Valid
N18WP	Beech V35	Fixed-wing, single engine	Individual owner Michigan	Standard	2014-05-06	Valid
N2236R	Cessna T210H	Fixed-wing, single engine	Southern Skies Aviation INC Cedar City, Utah	Standard	2014-05-06	Valid
N5742V	Beech V35	Fixed-wing, single engine	Co-owned owner Texas	Standard	2014-05-05	Valid
N65AC	Beech 95-C55	Fixed-wing, multi-engine	Individual owner West Virginia	Standard	2014-05-05	Valid
N332DG	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2014-05-01	Valid
N6658D	Beech V35B	Fixed-wing, single engine	Co-owned owner Utah	Standard	2014-05-01	Valid
N210ET	Cessna 210J	Fixed-wing, single engine	Vroom Consulting INC Ithaca, New York	Standard	2014-04-30	Valid
N39885	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2014-04-30	Valid
N4156S	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2014-04-29	Valid
N8635Z	Cessna P206C	Fixed-wing, single engine	Co-owned owner Georgia	Standard	2014-04-29	Valid
N6788C	Beech A36	Fixed-wing, single engine	Dewn Aviation LLC Noble, Oklahoma	Standard	2014-04-28	Valid
N1333T	Cessna 210J	Fixed-wing, single engine	Individual owner New York	Standard	2014-04-24	Valid
N114PC	Beech 58	Fixed-wing, multi-engine	Co-owned owner Texas	Standard	2014-04-18	Valid
N1873L	Beech V35B	Fixed-wing, single engine	Co-owned owner California	Standard	2014-04-18	Valid
N819LB	Beech A36	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2014-04-18	Valid
N4942U	Cessna 210E	Fixed-wing, single engine	Centurion LLC Bonney Lake, Washington	Standard	2014-04-15	Valid
N8075G	Cessna A188B	Fixed-wing, single engine	Vaughns Flying Service INC Reese, Michigan	Restricted	2014-04-14	Valid
N4946E	Cessna A185F	Fixed-wing, single engine	Sallmon Helga R Sandpoint, Idaho	Standard	2014-04-10	Valid
N687HV	Beech T-34B	Fixed-wing, single engine	American Airpower Heritage Flying Museum Dallas, Texas	Standard	2014-04-10	Valid
N8183R	Beech V35B	Fixed-wing, single engine	Individual owner South Carolina	Standard	2014-04-10	Valid
N8827M	Beech S35	Fixed-wing, single engine	Newport Elite LLC Newport Beach, California	Standard	2014-04-09	Valid
N185US	Cessna A185F	Fixed-wing, single engine	US Aviation.Com LLC Moorestown, New Jersey	Standard	2014-04-08	Valid
N231R	Beech F33A	Fixed-wing, single engine	Lumair LLC Northville, Michigan	Standard	2014-04-04	Valid
N4649U	Cessna U206G	Fixed-wing, single engine	My Holdings INC Anchorage, Alaska	Standard	2014-04-04	Valid
N77FE	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Maine	Standard	2014-04-04	Valid
N1745R	Cessna A185F	Fixed-wing, single engine	Individual owner Massachusetts	Multiple	2014-04-03	Valid
N2029S	Cessna 210L	Fixed-wing, single engine	Canyon West LLC Amarillo, Texas	Standard	2014-04-03	Valid
N6277V	Beech V35A	Fixed-wing, single engine	Blue Jay Aviation Lake Placid, Florida	Standard	2014-04-03	Valid
N210AT	Cessna 210J	Fixed-wing, single engine	Individual owner California	Standard	2014-04-02	Valid
N2858W	Beech E-55	Fixed-wing, multi-engine	Individual owner Kansas	Standard	2014-04-02	Valid
N65318	Beech A36	Fixed-wing, single engine	Prairie Sales INC Eden Prairie, Minnesota	Standard	2014-04-02	Valid
N30MK	Beech F33A	Fixed-wing, single engine	Individual owner Rhode Island	Standard	2014-03-31	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