Engines · piston (reciprocating) · data as of October 9, 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
N406WC	Beech S35	Fixed-wing, single engine	Co-owned owner Montana	Standard	2003-11-03	Valid
N8128N	Beech F33A	Fixed-wing, single engine	Cloudstreet Investments LLC San Antonio, Texas	Standard	2003-11-01	Valid
N7518N	Beech V35A	Fixed-wing, single engine	Co-owned owner Oregon	Standard	2003-10-30	Valid
N7334V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Minnesota	Standard	2003-10-29	Valid
N756ZV	Cessna U206G	Fixed-wing, single engine	Smokey Bay Air INC Homer, Alaska	Standard	2003-10-28	Valid
N33JS	Beech F33A	Fixed-wing, single engine	Broughton CORP Newtown Square, Pennsylvania	Standard	2003-10-27	Valid
N3316Q	Cessna 320D	Fixed-wing, multi-engine	Individual owner Pennsylvania	Standard	2003-10-08	Valid
N21398	Beech V35B	Fixed-wing, single engine	Individual owner California	Standard	2003-10-02	Valid
N6661Y	Beech 58	Fixed-wing, multi-engine	Individual owner Arizona	Standard	2003-10-01	Valid
N335JA	Beech S35	Fixed-wing, single engine	Individual owner Tennessee	Standard	2003-09-29	Valid
N4535F	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Standard	2003-09-24	Valid
N113BH	Cessna 180H	Fixed-wing, single engine	Bighorn Airways INC Sheridan, Wyoming	Standard	2003-09-09	Valid
N94EL	Cessna U206G	Fixed-wing, single engine	Individual owner Alaska	Multiple	2003-09-09	Valid
N23RM	Beech S35	Fixed-wing, single engine	Co-owned owner Kansas	Standard	2003-09-08	Valid
N207MR	Cessna 207A	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2003-09-04	Valid
N2504X	Cessna P206	Fixed-wing, single engine	Inspire Technologies INC Caldwell, Idaho	Standard	2003-09-04	Valid
N23589	Beech 58	Fixed-wing, multi-engine	High Times Adventure CO LLC Columbiana, Alabama	Standard	2003-08-27	Valid
N3956Y	Cessna 210D	Fixed-wing, single engine	Co-owned owner Florida	Standard	2003-08-27	Valid
N199KM	Beech V35B	Fixed-wing, single engine	Individual owner California	Standard	2003-08-22	Valid
N1579L	Beech V35B	Fixed-wing, single engine	Individual owner Washington	Standard	2003-08-14	Valid
N1060F	Cessna A185F	Fixed-wing, single engine	Individual owner Virginia	Standard	2003-08-13	Valid
N5217V	Cessna 210L	Fixed-wing, single engine	Scrobola Air LLC Wyoming, Pennsylvania	Standard	2003-08-08	Valid
N85052	Beech E-55	Fixed-wing, multi-engine	Individual owner Arizona	Standard	2003-08-07	Valid
N220BR	Cessna 310R	Fixed-wing, multi-engine	Co-owned owner Texas	Standard	2003-08-04	Valid
N7550N	Beech 36	Fixed-wing, single engine	Individual owner Texas	Standard	2003-07-30	Valid
N596T	Beech V35	Fixed-wing, single engine	Individual owner Florida	Standard	2003-07-25	Valid
N9698G	Cessna U206G	Fixed-wing, single engine	Individual owner Oregon	Standard	2003-07-24	Valid
N732YZ	Cessna U206G	Fixed-wing, single engine	Nevada Helicopter Leasing LLC Greenwood Village, Colorado	Restricted	2003-07-21	Valid
N119TW	Beech 58	Fixed-wing, multi-engine	Carter Flygare INC Sacramento, California	Standard	2003-07-18	Valid
N9451S	Beech 35-C33A	Fixed-wing, single engine	Individual owner Florida	Standard	2003-07-17	Valid
N4MA	Cessna A185E	Fixed-wing, single engine	Coral Key Air INC Brookhaven, New York	Restricted	2003-07-16	Valid
N206KY	Cessna U206B	Fixed-wing, single engine	Wings of Hope Chesterfield, Missouri	Standard	2003-07-07	Valid
N9003S	Beech S35	Fixed-wing, single engine	Westchester Flying Club INC Purchase, New York	Standard	2003-06-24	Valid
N33FS	Beech V35B	Fixed-wing, single engine	Bvd INC Yates Center, Kansas	Standard	2003-06-19	Valid
N761XD	Cessna 210M	Fixed-wing, single engine	Sdf Air LLC Wilmington, Delaware	Standard	2003-06-16	Valid
N1077A	Cessna A185F	Fixed-wing, single engine	Individual owner Washington	Standard	2003-06-05	Valid
N2290S	Cessna 210L	Fixed-wing, single engine	Elco Avion LLC Eagle Lake, Texas	Standard	2003-05-22	Valid
N321DG	Cessna 210K	Fixed-wing, single engine	Individual owner California	Standard	2003-05-22	Valid
N3824Y	Cessna 210D	Fixed-wing, single engine	Individual owner Massachusetts	Standard	2003-05-22	Valid
N36LH	Beech A36	Fixed-wing, single engine	Jackson Aviators LLC Nashville, Tennessee	Standard	2003-05-16	Valid
N36829	Beech A36	Fixed-wing, single engine	Prime Aviation LLC Wilmington, Delaware	Standard	2003-05-15	Valid
N7988Q	Cessna 401B	Fixed-wing, multi-engine	Individual owner New Jersey	Standard	2003-05-09	Valid
N27532	Cessna A185F	Fixed-wing, single engine	Shadow Aviation INC Fairbanks, Alaska	Restricted	2003-05-07	Valid
N65Y	Beech V35B	Fixed-wing, single engine	Individual owner California	Standard	2003-05-05	Valid
N4839J	Beech V35	Fixed-wing, single engine	Flying for Fun LLC Sunnyvale, Texas	Standard	2003-04-30	Valid
N34BA	Beech 45	Fixed-wing, single engine	Prvny Pluk LLC Houston, Texas	Standard	2003-04-24	Valid
N8939U	Beech S35	Fixed-wing, single engine	Individual owner Illinois	Standard	2003-04-08	Valid
N185YM	Cessna A185F	Fixed-wing, single engine	Individual owner Arizona	Standard	2003-04-07	Valid
N61368	Cessna A185F	Fixed-wing, single engine	Department of Inland Fisheries and Wildlife Augusta, Maine	Standard	2003-03-31	Valid
N4876V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Minnesota	Standard	2003-03-28	Valid
N418DK	Cessna 210D	Fixed-wing, single engine	Knies Aviation INC Huntsville, Alabama	Standard	2003-03-25	Valid
N7267N	Cessna U206G	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2003-03-25	Valid
N761QV	Cessna 210M	Fixed-wing, single engine	Co-owned owner Texas	Standard	2003-03-25	Valid
N6588V	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Colorado	Standard	2003-03-20	Valid
N934TC	Cessna A185F	Fixed-wing, single engine	Individual owner Michigan	Standard	2003-03-19	Valid
N2CB	Beech V35B	Fixed-wing, single engine	Boxman LLC Wilmington, Delaware	Standard	2003-03-18	Valid
N39818	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Florida	Standard	2003-03-18	Valid
N4077A	Beech V35B	Fixed-wing, single engine	Individual owner Florida	Standard	2003-03-17	Valid
N6361C	Beech V35B	Fixed-wing, single engine	Individual owner Missouri	Standard	2003-03-11	Valid
N185HE	Cessna A185F	Fixed-wing, single engine	Ed Air INC Oaktown, Indiana	Standard	2003-03-05	Valid
N614L	Beech V35B	Fixed-wing, single engine	Individual owner Montana	Standard	2003-03-05	Valid
N5820S	Beech S35	Fixed-wing, single engine	Co-owned owner Indiana	Standard	2003-02-28	Valid
N711VS	Beech A36	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2003-02-27	Valid
N6866R	Cessna T210G	Fixed-wing, single engine	Individual owner South Carolina	Standard	2003-02-26	Valid
N761SP	Cessna 210M	Fixed-wing, single engine	Twin City Cloud 7 INC Eden Prairie, Minnesota	Standard	2003-02-26	Valid
N1211F	Cessna A185F	Fixed-wing, single engine	Individual owner Washington	Standard	2003-02-20	Valid
N49LF	Beech A36	Fixed-wing, single engine	Co-owned owner California	Standard	2003-02-19	Valid
N1965T	Beech S35	Fixed-wing, single engine	Individual owner Florida	Standard	2003-02-13	Valid
N4640F	Cessna P206A	Fixed-wing, single engine	Individual owner Washington	Standard	2003-02-11	Valid
N757PA	Beech 58	Fixed-wing, multi-engine	Bmr Financial INC Kingston Springs, Tennessee	Standard	2003-02-06	Valid
N7962M	Beech 35-C33A	Fixed-wing, single engine	Padikins INC Wilmington, Delaware	Standard	2003-02-05	Valid
N2966T	Aero Commander 200D	Fixed-wing, single engine	Individual owner Maryland	Standard	2003-02-03	Valid
N7966M	Beech V35	Fixed-wing, single engine	Eagle Aviators LLC Franklin, Virginia	Standard	2003-01-30	Valid
N1928T	Beech F33A	Fixed-wing, single engine	Co-owned owner Ohio	Standard	2003-01-28	Valid
N4470S	Beech V35B	Fixed-wing, single engine	Individual owner California	Standard	2003-01-28	Valid
N5281V	Cessna 210L	Fixed-wing, single engine	One Vector LLC Wolcott, Colorado	Standard	2003-01-17	Valid
N206RT	Cessna U206G	Fixed-wing, single engine	Individual owner Colorado	Standard	2003-01-14	Valid
N4978C	Cessna U206G	Fixed-wing, single engine	Rwr Air INC Tok, Alaska	Standard	2003-01-13	Valid
N96BD	Beech 58	Fixed-wing, multi-engine	Roberts Aircraft INC West Chicago, Illinois	Standard	2003-01-10	Valid
N527BH	Beech 58	Fixed-wing, multi-engine	Red River Cellular Telephone CORP Paris, Texas	Standard	2003-01-09	Valid
N9512Y	Cessna 210N	Fixed-wing, single engine	Individual owner Florida	Standard	2003-01-06	Valid
N711LA	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Maryland	Standard	2002-12-31	Valid
N2538T	Navion NAVION H	Fixed-wing, single engine	Individual owner Tennessee	Standard	2002-12-26	Valid
N211EE	Beech V35A	Fixed-wing, single engine	V35A Speedsters LLC Henderson, Colorado	Standard	2002-12-19	Valid
N31494	Beech F33A	Fixed-wing, single engine	Locker Aircraft INC Muleshoe, Texas	Standard	2002-12-13	Valid
N1563W	Beech V35B	Fixed-wing, single engine	Co-owned owner California	Standard	2002-12-12	Valid
N5706J	Cessna P206E	Fixed-wing, single engine	Individual owner Idaho	Standard	2002-12-11	Valid
N12PM	Beech S35	Fixed-wing, single engine	Flying Bald Eagles INC New Lenox, Illinois	Standard	2002-12-03	Valid
N127MB	Cessna 310R	Fixed-wing, multi-engine	Co-owned owner Florida	Standard	2002-12-02	Valid
N5038R	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2002-12-02	Valid
N380PC	Beech A36	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2002-11-27	Valid
N3840U	Beech A36	Fixed-wing, single engine	Somerset Aviation LLC Gadsden, Alabama	Standard	2002-11-26	Valid
N35TT	Beech S35	Fixed-wing, single engine	J B & B LLC Midwest City, Oklahoma	Standard	2002-11-19	Valid
N77CL	Beech 95-C55	Fixed-wing, multi-engine	Co-owned owner Kansas	Standard	2002-11-13	Valid
N18329	Beech V35B	Fixed-wing, single engine	Coggin Marilyn Longview, Texas	Standard	2002-10-31	Valid
N185DY	Cessna A185F	Fixed-wing, single engine	Yankee Ventures LLC Wilmington, Delaware	Standard	2002-10-31	Valid
N777HG	Beech A36	Fixed-wing, single engine	Procyon Group INC Wilmington, Delaware	Standard	2002-10-22	Valid
N8562R	Beech F33A	Fixed-wing, single engine	Tj Airholdings INC Owner Trustee Wilmington, Delaware	Standard	2002-10-21	Valid
N103SM	Beech A36	Fixed-wing, single engine	Individual owner New Jersey	Standard	2002-10-16	Valid
N360T	Beech V35	Fixed-wing, single engine	Individual owner Washington	Standard	2002-10-11	Valid

Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 9, 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