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
N531BF	Beech V35B	Fixed-wing, single engine	Louis F Olberding Dds PC Lincoln, Nebraska	Standard	2011-03-04	Valid
N8135R	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2011-03-01	Valid
N618W	Cessna TP206A	Fixed-wing, single engine	Co-owned owner Texas	Standard	2011-02-25	Valid
N2105L	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2011-02-23	Valid
N2998M	Beech F33A	Fixed-wing, single engine	M T Aviation LLC Grove, Oklahoma	Standard	2011-02-23	Valid
N2784T	Beech V35	Fixed-wing, single engine	Co-owned owner New Mexico	Standard	2011-02-22	Valid
N191CC	Beech F33A	Fixed-wing, single engine	Individual owner Georgia	Standard	2011-02-16	Valid
N7248R	Beech 58	Fixed-wing, multi-engine	Individual owner South Dakota	Standard	2011-02-16	Valid
N24131	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2011-02-11	Valid
N23D	Navion NAVION H	Fixed-wing, single engine	Max Airways LLC Wilmington, Delaware	Standard	2011-02-10	Valid
N1597W	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2011-02-08	Valid
N91JR	Beech 58	Fixed-wing, multi-engine	Spring Mountain Properties LLC Fort Smith, Arkansas	Standard	2011-02-08	Valid
N6739U	Beech A36	Fixed-wing, single engine	Kahler Automation CORP Fairmont, Minnesota	Standard	2011-02-07	Valid
N6754R	Cessna T210F	Fixed-wing, single engine	Co-owned owner Washington	Standard	2011-02-07	Valid
N9866V	Cessna A188	Fixed-wing, single engine	Individual owner Colorado	Standard	2011-01-31	Valid
N756AN	Cessna U206G	Fixed-wing, single engine	Co-owned owner Kansas	Standard	2011-01-27	Valid
N8690Q	Beech S35	Fixed-wing, single engine	Individual owner Texas	Standard	2011-01-27	Valid
N158K	Beech 58	Fixed-wing, multi-engine	Pelican Aviation INC Gainesville, Georgia	Standard	2011-01-24	Valid
N350NE	Beech V35B	Fixed-wing, single engine	Maresco International CORP Alpha, New Jersey	Standard	2011-01-24	Valid
N213Q	Beech S35	Fixed-wing, single engine	Individual owner Minnesota	Standard	2011-01-21	Valid
N4574F	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Standard	2011-01-21	Valid
N39899	Bellanca 17-30A	Fixed-wing, single engine	Individual owner South Dakota	Standard	2011-01-19	Valid
N6105C	Beech F33A	Fixed-wing, single engine	Paschall Flights LLC Hailey, Idaho	Standard	2011-01-19	Valid
N80BV	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Missouri	Standard	2011-01-19	Valid
N4279S	Beech A36	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2011-01-12	Valid
N1551Q	Cessna A185F	Fixed-wing, single engine	Jdn Plane LLC Bellevue, Washington	Standard	2011-01-10	Valid
N33GK	Beech F33A	Fixed-wing, single engine	Co-owned owner Texas	Standard	2011-01-10	Valid
N210Y	Cessna 210K	Fixed-wing, single engine	Partners Aviation LLC Wilmington, Delaware	Standard	2011-01-07	Valid
N1679M	Cessna A185E	Fixed-wing, single engine	Vaughns Flying Service INC Reese, Michigan	Standard	2011-01-06	Valid
N8584R	Beech F33A	Fixed-wing, single engine	Rjm Aero INC Fallbrook, California	Standard	2011-01-06	Valid
N5479J	Cessna 310R	Fixed-wing, multi-engine	Bluegoose Aviation LLC Muscle Shoals, Alabama	Standard	2011-01-05	Valid
N464P	Beech V35	Fixed-wing, single engine	Individual owner Florida	Standard	2010-12-28	Valid
N72309	Cessna U206D	Fixed-wing, single engine	Orion Works LTD Denali Park, Alaska	Standard	2010-12-22	Valid
N7459N	Beech E33A	Fixed-wing, single engine	Co-owned owner Washington	Standard	2010-12-17	Valid
N55RS	Beech 95-C55	Fixed-wing, multi-engine	Crop-Serv INC Meade, Kansas	Standard	2010-12-16	Valid
N17791	Beech F33A	Fixed-wing, single engine	Individual owner Texas	Standard	2010-12-15	Valid
N363R	Beech 36	Fixed-wing, single engine	Mankind Aviation LLC Cincinnati, Ohio	Standard	2010-12-15	Valid
N3TY	Beech E-55	Fixed-wing, multi-engine	Evelyn Aviation INC Wilmington, Delaware	Standard	2010-12-14	Valid
N67DG	Cessna U206F	Fixed-wing, single engine	D&B Aircraft Leasing LLC Anchorage, Alaska	Standard	2010-12-08	Valid
N2035B	Beech A36	Fixed-wing, single engine	Individual owner Florida	Standard	2010-12-07	Valid
N3849X	Beech A36	Fixed-wing, single engine	Individual owner Mississippi	Standard	2010-12-07	Valid
N1651X	Cessna 210L	Fixed-wing, single engine	Individual owner Virginia	Standard	2010-12-01	Valid
N495RF	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Ohio	Standard	2010-12-01	Valid
N8699Q	Beech S35	Fixed-wing, single engine	Co-owned owner California	Standard	2010-12-01	Valid
N1806L	Beech A36	Fixed-wing, single engine	Individual owner California	Standard	2010-11-30	Valid
N357S	Beech V35A	Fixed-wing, single engine	Hill V35 LLC Nashville, Tennessee	Standard	2010-11-30	Valid
N192CR	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Massachusetts	Standard	2010-11-10	Valid
N554LR	Beech D55	Fixed-wing, multi-engine	Centerline Holdings Camden, Delaware	Standard	2010-11-08	Valid
N185PR	Cessna A185F	Fixed-wing, single engine	Proclaim Aviation Ministries Worthington, Minnesota	Standard	2010-10-21	Valid
N2399F	Cessna 210E	Fixed-wing, single engine	Individual owner Oregon	Standard	2010-10-20	Valid
N23542	Beech V35B	Fixed-wing, single engine	Mrj Aviation LLC Attica, New York	Standard	2010-10-18	Valid
N7694N	Beech V35A	Fixed-wing, single engine	Bradley Dennis M Newburgh, Maine	Standard	2010-10-13	Valid
N8405N	Beech V35A	Fixed-wing, single engine	Individual owner Arizona	Standard	2010-10-13	Valid
N8803V	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Minnesota	Standard	2010-10-06	Valid
N2179F	Cessna U206	Fixed-wing, single engine	Kingdom Air Corps INC Sutton, Alaska	Standard	2010-10-05	Valid
N8807M	Beech S35	Fixed-wing, single engine	Individual owner Rhode Island	Standard	2010-09-27	Valid
N92TT	Beech 58	Fixed-wing, multi-engine	Individual owner Iowa	Standard	2010-09-27	Valid
N2105F	Cessna U206	Fixed-wing, single engine	Clik Services LLC Forestdale, Massachusetts	Standard	2010-09-24	Valid
N1371G	Cessna 310R	Fixed-wing, multi-engine	Individual owner Massachusetts	Standard	2010-09-21	Valid
N185CW	Cessna A185F	Fixed-wing, single engine	Individual owner Nevada	Standard	2010-09-17	Valid
N8377N	Beech E33A	Fixed-wing, single engine	Individual owner California	Standard	2010-09-17	Valid
N8930N	Cessna 310R	Fixed-wing, multi-engine	Reprop LLC 310 Series Wilmington, Delaware	Standard	2010-09-17	Valid
N206TD	Cessna 206	Fixed-wing, single engine	Homestead Helicopters INC Missoula, Montana	Standard	2010-09-14	Valid
N1813B	Beech A36	Fixed-wing, single engine	RR Aviation Services LLC Wichita, Kansas	Standard	2010-09-13	Valid
N9499G	Cessna U206E	Fixed-wing, single engine	T F T LLC Hayden, Idaho	Standard	2010-09-10	Valid
N1804F	Cessna 210E	Fixed-wing, single engine	Individual owner Minnesota	Standard	2010-09-09	Valid
N120DB	Beech A36	Fixed-wing, single engine	B & I Leasing LLC Berryville, Virginia	Standard	2010-09-08	Valid
N4407R	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2010-09-08	Valid
N78417	Cessna A188B	Fixed-wing, single engine	Co-owned owner Kansas	Restricted	2010-09-07	Valid
N33MY	Beech F33A	Fixed-wing, single engine	3 Wings LLC Highland, Michigan	Standard	2010-09-02	Valid
N26732	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Illinois	Standard	2010-08-31	Valid
N814TD	Beech A36	Fixed-wing, single engine	Co-owned owner California	Standard	2010-08-31	Valid
N1763X	Cessna 210L	Fixed-wing, single engine	Robins Nest Aviation LLC Harrison, Ohio	Standard	2010-08-26	Valid
N4086A	Beech V35B	Fixed-wing, single engine	Individual owner Iowa	Standard	2010-08-24	Valid
N7907M	Beech 35-C33A	Fixed-wing, single engine	Individual owner Texas	Standard	2010-08-23	Valid
N6153Z	Cessna U206G	Fixed-wing, single engine	Jaars INC Waxhaw, North Carolina	Standard	2010-08-20	Valid
N1061P	Cessna U206G	Fixed-wing, single engine	Remote Properties LLC Anchorage, Alaska	Multiple	2010-08-19	Valid
N136EH	Beech A36	Fixed-wing, single engine	Hatfield Enterprises LLC Shreveport, Louisiana	Standard	2010-08-19	Valid
N5368U	Cessna 210N	Fixed-wing, single engine	Individual owner Kentucky	Standard	2010-08-10	Valid
N7005N	Beech E33A	Fixed-wing, single engine	Co-owned owner New York	Standard	2010-08-03	Valid
N3344M	Beech F33A	Fixed-wing, single engine	Individual owner Texas	Standard	2010-07-30	Valid
N9136Q	Beech A36	Fixed-wing, single engine	Beech 9136Q Charter Aircraft LLC Chico, California	Standard	2010-07-30	Valid
N450YR	Beech F33A	Fixed-wing, single engine	Individual owner Arkansas	Standard	2010-07-29	Valid
N648DW	Cessna P206A	Fixed-wing, single engine	Dewhipet LLC Sibley, Louisiana	Standard	2010-07-27	Valid
N273PS	Beech F33A	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2010-07-26	Valid
N4796M	Beech V35B	Fixed-wing, single engine	N4796M LLC Norridge, Illinois	Standard	2010-07-23	Valid
N9541G	Cessna A188B	Fixed-wing, single engine	Individual owner Tennessee	Restricted	2010-07-23	Valid
N3816S	Beech A36	Fixed-wing, single engine	Key Field Flyers LLC Toomsuba, Mississippi	Standard	2010-07-16	Valid
N2031K	Beech A36	Fixed-wing, single engine	Individual owner Massachusetts	Standard	2010-07-15	Valid
N5245C	Cessna 310R	Fixed-wing, multi-engine	N5245C LLC Sequim, Washington	Standard	2010-07-14	Valid
N57CF	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2010-07-14	Valid
N181DH	Cessna 206	Fixed-wing, single engine	Winkler Jeffery L Brush, Colorado	Standard	2010-07-13	Valid
N756JC	Cessna U206G	Fixed-wing, single engine	Beluga LLC Wasilla, Alaska	Standard	2010-07-12	Valid
N7967M	Beech V35	Fixed-wing, single engine	Mercer Aero Service INC Aurora, Colorado	Standard	2010-07-09	Valid
N1816R	Cessna A185F	Fixed-wing, single engine	Arizona Game & Fish Dept Phoenix, Arizona	Standard	2010-07-07	Valid
N777R	Cessna 210L	Fixed-wing, single engine	Individual owner Texas	Standard	2010-07-02	Valid
N6024X	Beech F33A	Fixed-wing, single engine	Wmrm LLC Saint Petersburg, Florida	Standard	2010-07-01	Valid
N109AF	Beech F33A	Fixed-wing, single engine	D&D Aviation LLC Weatherford, Texas	Standard	2010-06-29	Valid
N210ZZ	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Standard	2010-06-29	Valid
N72AL	Beech D55	Fixed-wing, multi-engine	Individual owner Louisiana	Standard	2010-06-28	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