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
N514AV	Beech F33A	Fixed-wing, single engine	Co-owned owner Massachusetts	Standard	1997-12-16	Valid
N8262M	Cessna 210K	Fixed-wing, single engine	Individual owner Arizona	Standard	1997-12-09	Valid
N700T	Beech 36	Fixed-wing, single engine	Individual owner California	Standard	1997-12-03	Valid
N635PP	Beech V35A	Fixed-wing, single engine	Co-owned owner Colorado	Standard	1997-12-01	Valid
N93050	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	1997-11-05	Valid
N19MA	Beech V35	Fixed-wing, single engine	Avco Security Systems INC Jupiter, Florida	Standard	1997-10-30	Valid
N3399Q	Cessna 310R	Fixed-wing, multi-engine	Baron Aviation Corporation Broad Run, Virginia	Standard	1997-10-27	Valid
N6640U	Beech A36	Fixed-wing, single engine	Dc Air CORP Aventura, Florida	Standard	1997-10-06	Valid
N350YR	Beech V35B	Fixed-wing, single engine	Individual owner New Hampshire	Standard	1997-10-02	Valid
N545D	Cessna U206G	Fixed-wing, single engine	Haskell Corporation Bellingham, Washington	Standard	1997-09-30	Valid
N8010Z	Cessna U206	Fixed-wing, single engine	Rosander Mining CO INC Mc Grath, Alaska	Standard	1997-09-02	Valid
N132FB	Beech A36	Fixed-wing, single engine	Rock Rivers Bancorp Rock Rapids, Iowa	Standard	1997-08-30	Valid
N3092W	Beech V35B	Fixed-wing, single engine	Individual owner Kentucky	Standard	1997-08-28	Valid
N87316	Cessna 310R	Fixed-wing, multi-engine	Co-owned owner New York	Standard	1997-08-27	Valid
N80YZ	Beech A36	Fixed-wing, single engine	Individual owner New York	Standard	1997-08-25	Valid
N1061W	Beech F33A	Fixed-wing, single engine	Individual owner North Carolina	Standard	1997-08-15	Valid
N6639V	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Ohio	Standard	1997-07-31	Valid
N5708G	Cessna A188B	Fixed-wing, single engine	Air Dakota Flite Hettinger, North Dakota	Restricted	1997-07-29	Valid
N2271R	Cessna T210J	Fixed-wing, single engine	Individual owner Florida	Standard	1997-07-24	Valid
N6574V	Bellanca 17-30	Fixed-wing, single engine	Co-owned owner Kansas	Standard	1997-07-17	Valid
N7368R	Beech F33A	Fixed-wing, single engine	Cruiseair Aviation INC Ramona, California	Standard	1997-07-11	Valid
N8045Q	Cessna A185F	Fixed-wing, single engine	Echo Bay Corporation Bow, Washington	Standard	1997-07-11	Valid
N1168T	Beech E-55	Fixed-wing, multi-engine	Knight Oil Resources INC New Orleans, Louisiana	Standard	1997-07-01	Valid
N4441Q	Cessna A188B	Fixed-wing, single engine	Individual owner Kansas	Restricted	1997-06-24	Valid
N2DN	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	1997-06-23	Valid
N500DM	Beech F33A	Fixed-wing, single engine	Five Delta Mike INC Wilmington, Delaware	Standard	1997-06-23	Valid
N6254N	Beech A36	Fixed-wing, single engine	Coil Construction INC Columbia, Missouri	Standard	1997-06-23	Valid
N7913R	Beech E33C	Fixed-wing, single engine	Individual owner Texas	Standard	1997-06-13	Valid
N4766E	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	1997-06-11	Valid
N1022F	Cessna A185F	Fixed-wing, single engine	Individual owner Washington	Standard	1997-06-04	Valid
N6675V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Minnesota	Standard	1997-06-03	Valid
N411A	Cessna A185F	Fixed-wing, single engine	Arnold Aviation & Thunder Mountain Express INC Cascade, Idaho	Standard	1997-05-21	Valid
N9461Z	Cessna U206G	Fixed-wing, single engine	Michigan Aeronautics Commission Lansing, Michigan	Multiple	1997-05-19	Valid
N97FA	Cessna A185F	Fixed-wing, single engine	Individual owner Maine	Standard	1997-05-19	Valid
N452SC	Beech V35B	Fixed-wing, single engine	Individual owner Missouri	Standard	1997-05-13	Valid
N133MW	Beech E33A	Fixed-wing, single engine	Sky Mile Limit Murrayville, Georgia	Standard	1997-05-08	Valid
N6847R	Cessna T210G	Fixed-wing, single engine	Alpine Aviation LLC Oklahoma City, Oklahoma	Standard	1997-05-07	Valid
N42261	Cessna 182L	Fixed-wing, single engine	Shenandoah Skies LLC Harrisonburg, Virginia	Multiple	1997-05-01	Valid
N8923U	Beech S35	Fixed-wing, single engine	Co-owned owner Texas	Standard	1997-04-28	Valid
N345JH	Beech F33A	Fixed-wing, single engine	Individual owner Texas	Standard	1997-04-24	Valid
N4118S	Beech F33A	Fixed-wing, single engine	Individual owner Idaho	Standard	1997-04-22	Valid
N4042A	Beech V35B	Fixed-wing, single engine	Rogden Aviation INC San Rafael, California	Standard	1997-04-14	Valid
N9563Q	Beech 35-C33A	Fixed-wing, single engine	Individual owner Colorado	Standard	1997-04-11	Valid
N2903Q	Cessna A185F	Fixed-wing, single engine	Twin Fiddle Investment Aeronautics LLC Atlanta, Georgia	Standard	1997-04-10	Valid
N3797Q	Beech V35	Fixed-wing, single engine	Kolb Norman R Tijeras, New Mexico	Standard	1997-04-01	Valid
N4914Q	Cessna A188B	Fixed-wing, single engine	Co-owned owner California	Standard	1997-04-01	Valid
N284D	Beech A36	Fixed-wing, single engine	Co-owned owner California	Standard	1997-03-19	Valid
N8426N	Beech E33A	Fixed-wing, single engine	Nicor INC Columbus, Nebraska	Standard	1997-03-19	Valid
N2513T	Navion NAVION H	Fixed-wing, single engine	Individual owner Louisiana	Standard	1997-03-04	Valid
N9791G	Cessna U206G	Fixed-wing, single engine	Individual owner Ohio	Standard	1997-03-04	Valid
N24HL	Beech F33A	Fixed-wing, single engine	Individual owner Maryland	Standard	1997-02-25	Valid
N9980G	Cessna A188A	Fixed-wing, single engine	Individual owner Montana	Standard	1997-02-24	Valid
N1581G	Cessna 310R	Fixed-wing, multi-engine	Individual owner Ohio	Standard	1997-02-21	Valid
N231LC	Beech 58	Fixed-wing, multi-engine	First United INC Seminole, Florida	Standard	1997-02-06	Valid
N52004	Cessna 180J	Fixed-wing, single engine	Individual owner Alaska	Multiple	1997-02-05	Valid
N433K	Beech D55	Fixed-wing, multi-engine	Individual owner North Carolina	Standard	1997-02-04	Valid
N70037	Cessna A185E	Fixed-wing, single engine	Bancroft Contracting Corporation South Paris, Maine	Standard	1997-02-03	Valid
N9101F	Cessna A185F	Fixed-wing, single engine	Individual owner Wisconsin	Standard	1997-02-03	Valid
N210FB	Cessna 210L	Fixed-wing, single engine	Individual owner California	Standard	1997-01-28	Valid
N426AS	Cessna P206D	Fixed-wing, single engine	Individual owner Texas	Standard	1997-01-27	Valid
N4863Q	Cessna A188B	Fixed-wing, single engine	Klamar Spraying INC Gatzke, Minnesota	Restricted	1997-01-24	Valid
N816U	Beech V35B	Fixed-wing, single engine	Individual owner Washington	Standard	1997-01-22	Valid
N524CD	Beech 36	Fixed-wing, single engine	Co-owned owner Tennessee	Standard	1997-01-15	Valid
N6027U	Beech A36	Fixed-wing, single engine	Individual owner Minnesota	Standard	1997-01-14	Valid
N3311S	Cessna 210J	Fixed-wing, single engine	Experimental Aircraft Association INC Oshkosh, Wisconsin	Standard	1997-01-10	Valid
N411L	Beech E-55	Fixed-wing, multi-engine	Individual owner Nebraska	Standard	1996-12-26	Valid
N5669K	Beech S35	Fixed-wing, single engine	Yankee Airmen INC Torrance, California	Standard	1996-12-20	Valid
N4755Q	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Standard	1996-12-17	Valid
N88PM	Beech A45 (T-34A)	Fixed-wing, single engine	Prvny Pluk L L C Houston, Texas	Standard	1996-12-12	Valid
N4864Y	Cessna 210N	Fixed-wing, single engine	Individual owner Florida	Standard	1996-12-05	Valid
N53105	Cessna A188B	Fixed-wing, single engine	Individual owner Kansas	Restricted	1996-11-27	Valid
N9358N	Cessna A185F	Fixed-wing, single engine	Individual owner Washington	Standard	1996-11-21	Valid
N93591	Bellanca 17-30A	Fixed-wing, single engine	Co-owned owner Illinois	Standard	1996-11-14	Valid
N3376G	Cessna 310R	Fixed-wing, multi-engine	Lindsay Aviation INC West Seneca, New York	Standard	1996-11-13	Valid
N2532S	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	1996-11-12	Valid
N122CT	Beech E-55	Fixed-wing, multi-engine	Turner Eye Clinic INC Cabot, Arkansas	Standard	1996-10-16	Valid
N3460L	Cessna U206B	Fixed-wing, single engine	Individual owner Alaska	Standard	1996-10-16	Valid
N9534E	Bellanca 17-30A	Fixed-wing, single engine	Borscht INC Valley View, Pennsylvania	Standard	1996-10-10	Valid
N5830J	Cessna A185E	Fixed-wing, single engine	Individual owner Ohio	Standard	1996-10-07	Valid
N720L	Cessna 320F	Fixed-wing, multi-engine	Withheld at owner's request	Standard	1996-10-07	Valid
N7050N	Beech V35A	Fixed-wing, single engine	Individual owner Georgia	Standard	1996-10-03	Valid
N210DG	Cessna 210L	Fixed-wing, single engine	Co-owned owner Massachusetts	Standard	1996-09-26	Valid
N125KT	Cessna A185F	Fixed-wing, single engine	Rustair INC Anchorage, Alaska	Standard	1996-09-19	Valid
N1292F	Cessna A185F	Fixed-wing, single engine	Rustair INC Anchorage, Alaska	Multiple	1996-09-19	Valid
N5849J	Cessna A185E	Fixed-wing, single engine	Individual owner Minnesota	Multiple	1996-09-18	Valid
N8604Z	Cessna P206B	Fixed-wing, single engine	Individual owner Texas	Standard	1996-09-13	Valid
N4432A	Beech V35B	Fixed-wing, single engine	Co-owned owner North Carolina	Standard	1996-09-03	Valid
N67WD	Bellanca 17-30	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	1996-09-03	Valid
N6038W	Beech 58	Fixed-wing, multi-engine	Co-owned owner California	Standard	1996-08-14	Valid
N4308S	Beech A36	Fixed-wing, single engine	Individual owner Illinois	Standard	1996-08-12	Valid
N23AG	Beech V35B	Fixed-wing, single engine	Co-owned owner Alabama	Standard	1996-08-07	Valid
N7575H	Cessna A185F	Fixed-wing, single engine	Individual owner Montana	Standard	1996-07-29	Valid
N1886W	Beech A36	Fixed-wing, single engine	86 Whiskey Corporation Vineland, New Jersey	Standard	1996-07-25	Valid
N2122U	Cessna A188A	Fixed-wing, single engine	Anderson Aerial Spraying Service INC Canby, Minnesota	Standard	1996-07-25	Valid
N2358F	Cessna 210E	Fixed-wing, single engine	East County Communications INC Hurricane, Utah	Standard	1996-07-25	Valid
N185KW	Cessna A185F	Fixed-wing, single engine	Individual owner Wisconsin	Standard	1996-07-16	Valid
N50TF	Cessna A185F	Fixed-wing, single engine	Co-owned owner Washington	Standard	1996-07-09	Valid
N3954A	Beech F33A	Fixed-wing, single engine	Co-owned owner California	Standard	1996-07-02	Valid
N276BX	Beech V35	Fixed-wing, single engine	Co-owned owner Oklahoma	Standard	1996-06-20	Valid
N99GB	Cessna 210L	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	1996-06-20	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