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
N1634W	Beech V35B	Fixed-wing, single engine	Individual owner Mississippi	Standard	2015-08-11	Valid
N3017W	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2015-08-11	Valid
N210GS	Cessna 210L	Fixed-wing, single engine	Retail Online Solutions INC Columbus, Ohio	Standard	2015-08-10	Valid
N28130	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Oregon	Standard	2015-08-06	Valid
N514PC	Beech V35A	Fixed-wing, single engine	Individual owner Tennessee	Standard	2015-08-06	Valid
N72194	Cessna TU206D	Fixed-wing, single engine	Skydive Ky LLC Cecilia, Kentucky	Standard	2015-08-06	Valid
N975	Beech 95-B55 (T42A)	Fixed-wing, multi-engine	J&H Aircraft Leasing LLC Berrien Springs, Michigan	Standard	2015-08-06	Valid
N210AD	Cessna 210G	Fixed-wing, single engine	Uniplane INC Trustee Wilmington, Delaware	Standard	2015-08-05	Valid
N3611A	Beech A36	Fixed-wing, single engine	Sgmbb LLC Seneca, South Carolina	Standard	2015-08-04	Valid
N4747J	Beech A23A	Fixed-wing, single engine	Individual owner Minnesota	Standard	2015-08-04	Valid
N65JM	Beech E-55	Fixed-wing, multi-engine	Gjf Enterprises INC Port Orange, Florida	Standard	2015-08-04	Valid
N7911A	Beech S35	Fixed-wing, single engine	Individual owner Virginia	Standard	2015-08-04	Valid
N2524T	Navion NAVION H	Fixed-wing, single engine	Co-owned owner Colorado	Standard	2015-08-03	Valid
N6287V	Beech V35A	Fixed-wing, single engine	Individual owner Texas	Standard	2015-08-03	Valid
N6695N	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	2015-08-03	Valid
N28013	Bellanca 17-30A	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2015-07-31	Valid
N185FS	Cessna A185F	Fixed-wing, single engine	Co-owned owner Oregon	Multiple	2015-07-30	Valid
N581CK	Beech 58	Fixed-wing, multi-engine	Kalitta Charters LLC Ypsilanti, Michigan	Standard	2015-07-30	Valid
N7301B	Beech E35	Fixed-wing, single engine	Individual owner Alabama	Standard	2015-07-28	Valid
N2781J	Cessna A185E	Fixed-wing, single engine	Individual owner Texas	Standard	2015-07-27	Valid
N4427W	Beech V35B	Fixed-wing, single engine	Rockwall LLC Wye Mills, Maryland	Standard	2015-07-27	Valid
N227Q	Beech S35	Fixed-wing, single engine	Individual owner Washington	Standard	2015-07-23	Valid
N3770Y	Cessna 210D	Fixed-wing, single engine	Big Bend C C Foundation Moses Lake, Washington	Standard	2015-07-23	Valid
N90659	Beech V35B	Fixed-wing, single engine	Individual owner Wyoming	Standard	2015-07-20	Valid
N200GD	Beech F33A	Fixed-wing, single engine	Individual owner Texas	Standard	2015-07-17	Valid
N3195M	Cessna 310R	Fixed-wing, multi-engine	Aspire Management INC New Castle, Delaware	Standard	2015-07-17	Valid
N1021W	Beech A36	Fixed-wing, single engine	Greystone Enterprises INC Oklahoma City, Oklahoma	Standard	2015-07-16	Valid
N4913U	Cessna 210E	Fixed-wing, single engine	Individual owner Indiana	Standard	2015-07-16	Valid
N6202V	Beech E33A	Fixed-wing, single engine	Co-owned owner Georgia	Standard	2015-07-15	Valid
N81WM	Beech F33A	Fixed-wing, single engine	Paladin Aircraft Restoration INC Monticello, Utah	Standard	2015-07-15	Valid
N1577H	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2015-07-14	Valid
N110CB	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Oregon	Standard	2015-07-13	Valid
N33MD	Bellanca 17-30A	Fixed-wing, single engine	Skyhawk 172 Partners LLC Stateline, Nevada	Standard	2015-07-13	Valid
N2024K	Beech V35B	Fixed-wing, single engine	B2S Aviation LLC Billings, Montana	Standard	2015-07-10	Valid
N9652E	Bellanca 17-30A	Fixed-wing, single engine	Individual owner New York	Standard	2015-07-10	Valid
N201GM	Aero Commander 200D	Fixed-wing, single engine	Sundale Aviation INC Erwinna, Pennsylvania	Standard	2015-07-08	Valid
N17738	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	2015-07-07	Valid
N60956	Cessna A185F	Fixed-wing, single engine	Co-owned owner Idaho	Standard	2015-07-07	Valid
N6736V	Beech A36	Fixed-wing, single engine	Individual owner Kentucky	Standard	2015-07-06	Valid
N1566G	Beech F33A	Fixed-wing, single engine	Co-owned owner Ohio	Standard	2015-07-01	Valid
N4663C	Cessna A185F	Fixed-wing, single engine	Individual owner Colorado	Standard	2015-07-01	Valid
N521VR	Beech S35	Fixed-wing, single engine	Individual owner Illinois	Standard	2015-07-01	Valid
N39897	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Michigan	Standard	2015-06-30	Valid
N6832R	Cessna T210G	Fixed-wing, single engine	Individual owner California	Standard	2015-06-30	Valid
N922PJ	Beech A45	Fixed-wing, single engine	Co-owned owner Montana	Standard	2015-06-30	Valid
N375F	Cessna U206G	Fixed-wing, single engine	Department of the Interior Boise, Idaho	Standard	2015-06-29	Valid
N8425N	Beech V35A	Fixed-wing, single engine	Woods Aviation LLC Fillmore, Illinois	Standard	2015-06-26	Valid
N185RC	Cessna A185F	Fixed-wing, single engine	Individual owner Arizona	Standard	2015-06-24	Valid
N7196N	Beech V35A	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2015-06-23	Valid
N27VM	Beech D55	Fixed-wing, multi-engine	Blue Star Aviation LLC Saint Augustine, Florida	Standard	2015-06-22	Valid
N5783J	Cessna 210K	Fixed-wing, single engine	Individual owner South Dakota	Standard	2015-06-22	Valid
N149BD	Beech V35B	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2015-06-17	Valid
N282PH	Cessna U206	Fixed-wing, single engine	Mission Padamo Aviation and Support INC Luray, Virginia	Standard	2015-06-16	Valid
N8262R	Bellanca 17-30A	Fixed-wing, single engine	Individual owner South Dakota	Standard	2015-06-15	Valid
N9525E	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Kansas	Standard	2015-06-15	Valid
N409AC	Aero Commander 200D	Fixed-wing, single engine	Highland Holdings LLC Bethlehem, Pennsylvania	Standard	2015-06-12	Valid
N5619K	Beech S35	Fixed-wing, single engine	Good Natured Creations LLC Tucson, Arizona	Standard	2015-06-11	Valid
N1805	Cessna A185E	Fixed-wing, single engine	Co-owned owner Arizona	Standard	2015-06-10	Valid
N478T	Beech S35	Fixed-wing, single engine	Individual owner Texas	Standard	2015-06-09	Valid
N5701V	Beech 95-C55	Fixed-wing, multi-engine	Ruffcorn Aviation Bettendort, Iowa	Standard	2015-06-09	Valid
N7144Q	Cessna U206F	Fixed-wing, single engine	Jungle Breezes Youth Ministries East Earl, Pennsylvania	Standard	2015-06-05	Valid
N31368	Beech T-34B	Fixed-wing, single engine	Anderson Aviation INC Anderson, South Carolina	Standard	2015-06-02	Valid
N39AD	Beech A36	Fixed-wing, single engine	Individual owner Alaska	Standard	2015-06-02	Valid
N4767U	Cessna U206G	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2015-06-02	Valid
N5GW	Beech F33A	Fixed-wing, single engine	Individual owner New Hampshire	Standard	2015-06-02	Valid
N81LA	Cessna A185F	Fixed-wing, single engine	Individual owner Puerto Rico	Standard	2015-06-01	Valid
N731TS	Cessna A188B	Fixed-wing, single engine	Individual owner Florida	Restricted	2015-05-28	Valid
N9204H	Cessna A185F	Fixed-wing, single engine	Tongass Air LLC Ketchikan, Alaska	Experimental	2015-05-28	Valid
N48CM	Beech E-55	Fixed-wing, multi-engine	R Stephen Smith INC Wichita, Kansas	Standard	2015-05-27	Valid
N559MC	Cessna A185F	Fixed-wing, single engine	Bkjm LLC Blanchard, Oklahoma	Standard	2015-05-27	Valid
N1220G	Cessna U206F	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2015-05-21	Valid
N99YS	Beech 36	Fixed-wing, single engine	Airspeed and Money LLC Coweta, Oklahoma	Standard	2015-05-21	Valid
N7386V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2015-05-20	Valid
N28062	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Washington	Standard	2015-05-18	Valid
N574ST	Cessna U206G	Fixed-wing, single engine	State of Alaska Anchorage, Alaska	Standard	2015-05-18	Valid
N732ZV	Cessna 210M	Fixed-wing, single engine	Individual owner Louisiana	Standard	2015-05-18	Valid
N4896E	Cessna A185F	Fixed-wing, single engine	Individual owner Massachusetts	Standard	2015-05-14	Valid
N87DU	Beech D55	Fixed-wing, multi-engine	Bdb Equipment LLC Columbus, Ohio	Standard	2015-05-14	Valid
N5769K	Beech S35	Fixed-wing, single engine	Individual owner Georgia	Standard	2015-05-12	Valid
N5822W	Beech 58	Fixed-wing, multi-engine	Kanza Aviation LLC Andover, Kansas	Standard	2015-05-12	Valid
N761LT	Beech V35B	Fixed-wing, single engine	Individual owner Florida	Standard	2015-05-12	Valid
N7767B	Cessna A185E	Fixed-wing, single engine	Co-owned owner Arizona	Standard	2015-05-12	Valid
N77CR	Cessna U206F	Fixed-wing, single engine	Volatile Aero Ventures LLC Boulder City, Nevada	Standard	2015-05-12	Valid
N3711Y	Beech 58	Fixed-wing, multi-engine	Aero Venture Lc Shreveport, Louisiana	Standard	2015-05-11	Valid
N185KS	Cessna A185F	Fixed-wing, single engine	Individual owner New Mexico	Standard	2015-05-07	Valid
N5809F	Cessna 210F	Fixed-wing, single engine	Co-owned owner Michigan	Standard	2015-05-07	Valid
N794CB	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	2015-05-07	Valid
N709T	Beech A36	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2015-05-06	Valid
N450WS	Beech A36	Fixed-wing, single engine	Co-owned owner Texas	Standard	2015-05-05	Valid
N83GG	Beech A36	Fixed-wing, single engine	Cec Aviaiton Services LLC Windsor, California	Standard	2015-05-05	Valid
N831PR	Cessna U206F	Fixed-wing, single engine	Individual owner Tennessee	Standard	2015-05-01	Valid
N583CK	Beech 58	Fixed-wing, multi-engine	Kalitta Charters LLC Ypsilanti, Michigan	Standard	2015-04-29	Valid
N881H	Beech E-55	Fixed-wing, multi-engine	Co-owned owner Texas	Standard	2015-04-28	Valid
N563DB	Beech V35	Fixed-wing, single engine	Co-owned owner Washington	Standard	2015-04-23	Valid
N357D	Beech V35	Fixed-wing, single engine	Individual owner Colorado	Standard	2015-04-22	Valid
N4226Q	Cessna U206F	Fixed-wing, single engine	Volatile Aero Ventures LLC Boulder City, Nevada	Standard	2015-04-22	Valid
N1859F	Cessna 210F	Fixed-wing, single engine	Individual owner Minnesota	Standard	2015-04-21	Valid
N623MH	Beech F33A	Fixed-wing, single engine	Individual owner Texas	Standard	2015-04-21	Valid
N440D	Beech S35	Fixed-wing, single engine	Co-owned owner Montana	Standard	2015-04-20	Valid
N9431Q	Beech F33A	Fixed-wing, single engine	N9431Q LLC Round Rock, Texas	Standard	2015-04-20	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