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
N1826L	Beech A36	Fixed-wing, single engine	Rhr Management INC Bancroft, Wisconsin	Standard	2000-05-18	Valid
N4342A	Beech V35B	Fixed-wing, single engine	R&B Air LLC Clayton, Missouri	Standard	2000-05-16	Valid
N74PS	Cessna U206F	Fixed-wing, single engine	Orion Works INC Denali Park, Alaska	Standard	2000-05-16	Valid
N9009Q	Beech V35B	Fixed-wing, single engine	Hanna Aviation INC Wheaton, Illinois	Standard	2000-05-15	Valid
N55CV	Beech E-55	Fixed-wing, multi-engine	Cavu LLC Charleston, West Virginia	Standard	2000-05-03	Valid
N64DD	Beech 36	Fixed-wing, single engine	Individual owner New York	Standard	2000-05-02	Valid
N100NK	Beech D55	Fixed-wing, multi-engine	Land Air Sea INC Chesapeake, Virginia	Standard	2000-04-21	Valid
N75CG	Cessna A185F	Fixed-wing, single engine	Richter Aviation INC Maxwell, California	Standard	2000-04-20	Valid
N103WW	Beech 35-B33	Fixed-wing, single engine	Co-owned owner Illinois	Standard	2000-04-13	Valid
N76TM	Bellanca 17-30A	Fixed-wing, single engine	Foreign Auto Specialties Minneapolis, Minnesota	Standard	2000-03-29	Valid
N4740Q	Cessna A185E	Fixed-wing, single engine	Individual owner Montana	Standard	2000-03-28	Valid
N8224J	Beech F33A	Fixed-wing, single engine	Individual owner Texas	Standard	2000-03-24	Valid
N185AK	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2000-03-23	Valid
N1163T	Beech E-55	Fixed-wing, multi-engine	Irish Aviation INC Orlando, Florida	Standard	2000-03-22	Valid
N4706Q	Cessna A185E	Fixed-wing, single engine	Individual owner Montana	Standard	2000-03-15	Valid
N2091L	Beech A36	Fixed-wing, single engine	Individual owner Virginia	Standard	2000-03-14	Valid
N4319R	Cessna A185F	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2000-03-13	Valid
N5624S	Beech V35	Fixed-wing, single engine	Kin-Air INC Hendersonville, Tennessee	Standard	2000-03-07	Valid
N94EM	Beech A36	Fixed-wing, single engine	Skyclub A36 LLC Alpharetta, Georgia	Standard	2000-02-29	Valid
N77QJ	Beech V35A	Fixed-wing, single engine	Individual owner North Carolina	Standard	2000-02-28	Valid
N1745W	Beech F33A	Fixed-wing, single engine	Thoroughscape INC Wellington, Florida	Standard	2000-02-22	Valid
N5244U	Cessna 206	Fixed-wing, single engine	Individual owner Washington	Standard	2000-02-17	Valid
N8792Z	Cessna P206D	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2000-02-17	Valid
N133BS	Beech F33A	Fixed-wing, single engine	Co-owned owner Montana	Standard	2000-02-10	Valid
N294AM	Beech A36	Fixed-wing, single engine	Aeh Flying INC Cincinnati, Ohio	Standard	2000-02-09	Valid
N3462L	Cessna U206B	Fixed-wing, single engine	Co-owned owner Texas	Standard	2000-02-09	Valid
N807TH	Beech 58	Fixed-wing, multi-engine	San Mateo Real Estate INC San Mateo, California	Standard	2000-02-07	Valid
N3168W	Beech A36	Fixed-wing, single engine	Black Gold Flying Club INC Belvidere, New Jersey	Standard	2000-02-03	Valid
N5869F	Cessna 210G	Fixed-wing, single engine	Individual owner Texas	Standard	2000-02-03	Valid
N288P	Beech 58	Fixed-wing, multi-engine	Blue Water Aviation INC Jupiter, Florida	Standard	2000-02-02	Valid
N9002S	Beech S35	Fixed-wing, single engine	D'Alessio Enterprises INC Smithville, Tennessee	Standard	2000-02-02	Valid
N3129U	Beech F33A	Fixed-wing, single engine	Individual owner Florida	Standard	2000-02-01	Valid
N78185	Cessna A185F	Fixed-wing, single engine	Co-owned owner California	Standard	2000-01-28	Valid
N4810	Cessna A185F	Fixed-wing, single engine	Individual owner Texas	Standard	2000-01-22	Valid
N4851J	Cessna A188B	Fixed-wing, single engine	Abernathy Spraying Service INC Tipton, Oklahoma	Restricted	2000-01-04	Valid
N9970Z	Cessna U206G	Fixed-wing, single engine	Hartland Aviation LLC Hartland, Michigan	Standard	1999-12-30	Valid
N55B	Cessna 310R	Fixed-wing, multi-engine	Individual owner New York	Standard	1999-12-20	Valid
N755AC	Cessna 402A	Fixed-wing, multi-engine	Airswiss INC Wilmington, Delaware	Standard	1999-12-20	Valid
N6130C	Cessna 210N	Fixed-wing, single engine	May and Carter Oil CO Jackson, Georgia	Standard	1999-12-17	Valid
N2172F	Cessna U206	Fixed-wing, single engine	Individual owner Ohio	Standard	1999-11-26	Valid
N4094B	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Georgia	Standard	1999-11-22	Valid
N3212M	Beech F33A	Fixed-wing, single engine	Kietzer Farms LLC Wilmington, Delaware	Standard	1999-11-19	Valid
N128TT	Cessna U206G	Fixed-wing, single engine	Warner Wings LLC Yakima, Washington	Standard	1999-11-10	Valid
N888GP	Cessna 310R	Fixed-wing, multi-engine	Pt Air LLC Madison, Wisconsin	Standard	1999-11-10	Valid
N4591K	Ryan NAVION A	Fixed-wing, single engine	Individual owner Washington	Standard	1999-11-03	Valid
N8678Q	Beech S35	Fixed-wing, single engine	Co-owned owner Texas	Standard	1999-10-26	Valid
N3689U	Beech A36	Fixed-wing, single engine	Individual owner Illinois	Standard	1999-10-25	Valid
N185BW	Cessna A185F	Fixed-wing, single engine	Individual owner Oregon	Standard	1999-10-20	Valid
N6508V	Beech F33A	Fixed-wing, single engine	Individual owner Arizona	Standard	1999-10-18	Valid
N5830K	Beech S35	Fixed-wing, single engine	Individual owner California	Standard	1999-10-13	Valid
N262PM	Beech F33A	Fixed-wing, single engine	Big Bend Community College Moses Lake, Washington	Standard	1999-10-06	Valid
N3923G	Cessna U206C	Fixed-wing, single engine	Middle Fork Aviation INC Challis, Idaho	Standard	1999-09-30	Valid
N60402	Beech A36	Fixed-wing, single engine	Individual owner South Carolina	Standard	1999-09-28	Valid
N8112R	Beech E33C	Fixed-wing, single engine	Individual owner New Mexico	Standard	1999-09-24	Valid
N136B	Beech A36	Fixed-wing, single engine	Individual owner Mississippi	Standard	1999-09-23	Valid
N191Y	Beech V35	Fixed-wing, single engine	Platte Valley Air LLC Columbus, Nebraska	Standard	1999-09-16	Valid
N44309	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	1999-09-15	Valid
N2216F	Cessna U206G	Fixed-wing, single engine	Summit North LLC Anchorage, Alaska	Standard	1999-09-14	Valid
N22AG	Beech V35B	Fixed-wing, single engine	Individual owner Mississippi	Standard	1999-09-10	Valid
N25615	Beech A36	Fixed-wing, single engine	Roark CO INC Montgomery, Alabama	Standard	1999-09-01	Valid
N6117F	Cessna 210H	Fixed-wing, single engine	Individual owner Virginia	Standard	1999-08-30	Valid
N6314Z	Bellanca 17-30A	Fixed-wing, single engine	William T Murphy Investigations INC Stillwater, Minnesota	Standard	1999-08-26	Valid
N844CS	Beech V35B	Fixed-wing, single engine	Individual owner Michigan	Standard	1999-08-26	Valid
N711TM	Cessna 210L	Fixed-wing, single engine	Individual owner Michigan	Standard	1999-08-13	Valid
N6330C	Cessna 210N	Fixed-wing, single engine	Los Angeles County Sheriffs Department Long Beach, California	Standard	1999-08-10	Valid
N4883F	Cessna U206A	Fixed-wing, single engine	Individual owner California	Standard	1999-08-06	Valid
N737DM	Cessna A185F	Fixed-wing, single engine	Above & Beyond Aviation INC Anchorage, Alaska	Multiple	1999-08-02	Valid
N30EW	Cessna 210L	Fixed-wing, single engine	Three Zero Echo Whisky INC Wilmington, Delaware	Standard	1999-07-28	Valid
N610EA	Beech D55	Fixed-wing, multi-engine	Harvard CORP Hartford, Connecticut	Standard	1999-07-28	Valid
N4597F	Cessna A185E	Fixed-wing, single engine	Individual owner Oregon	Standard	1999-07-27	Valid
N4865V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Minnesota	Standard	1999-07-23	Valid
N110NJ	Cessna U206G	Fixed-wing, single engine	State of New Jersey Trenton, New Jersey	Standard	1999-07-12	Valid
N7339R	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	1999-07-02	Valid
N92DC	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	1999-07-02	Valid
N119EW	Beech A36	Fixed-wing, single engine	Bte Aviation LLC Wilmington, Delaware	Standard	1999-07-01	Valid
N291AB	Beech V35B	Fixed-wing, single engine	Individual owner New Jersey	Standard	1999-06-30	Valid
N734GW	Cessna U206G	Fixed-wing, single engine	Rwr Air INC Tok, Alaska	Multiple	1999-06-28	Valid
N2492Y	Beech 36	Fixed-wing, single engine	Individual owner Texas	Standard	1999-06-24	Valid
N400MT	Beech A45	Fixed-wing, single engine	Spevco INC Pfafftown, North Carolina	Restricted	1999-06-22	Valid
N70DR	Beech V35B	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	1999-06-22	Valid
N53013	Cessna A185F	Fixed-wing, single engine	Individual owner Pennsylvania	Multiple	1999-06-19	Valid
N7562U	Cessna 150M	Fixed-wing, single engine	Individual owner Wisconsin	Standard	1999-06-19	Valid
N149R	Beech V35B	Fixed-wing, single engine	Best Erectors INC Wilmington, Delaware	Standard	1999-06-14	Valid
N9933Z	Cessna U206G	Fixed-wing, single engine	Freelance Air Kennesaw, Georgia	Standard	1999-06-11	Valid
N8252M	Cessna 210K	Fixed-wing, single engine	Applied Olap INC Huntsville, Alabama	Standard	1999-06-07	Valid
N9272R	Cessna A188B	Fixed-wing, single engine	Individual owner Georgia	Restricted	1999-06-04	Valid
N137F	Beech 95-C55	Fixed-wing, multi-engine	Individual owner Mississippi	Standard	1999-05-24	Valid
N784AW	Cessna A185F	Fixed-wing, single engine	Sea Rogue Enterprises INC Greenville, Maine	Standard	1999-05-24	Valid
N8287Q	Cessna U206F	Fixed-wing, single engine	Adventist World Aviation Wilson, North Carolina	Standard	1999-05-12	Valid
N207CC	Cessna T207A	Fixed-wing, single engine	Abaco Fire Rescue Association INC Lewes, Delaware	Standard	1999-05-07	Valid
N3864C	Beech A36	Fixed-wing, single engine	Co-owned owner New Mexico	Standard	1999-05-03	Valid
N407RK	Cessna 401	Fixed-wing, multi-engine	Individual owner California	Standard	1999-04-27	Valid
N2037W	Beech V35	Fixed-wing, single engine	Gregs Crop Care CO Wilbur, Washington	Standard	1999-04-15	Valid
N2658B	Beech F33A	Fixed-wing, single engine	Individual owner Florida	Standard	1999-04-14	Valid
N4192A	Beech V35B	Fixed-wing, single engine	Rocky Mountain Aviation INC Wilmington, Delaware	Standard	1999-04-13	Valid
N41SB	Beech S35	Fixed-wing, single engine	Individual owner Tennessee	Standard	1999-04-12	Valid
N186D	Cessna 185	Fixed-wing, single engine	Individual owner Washington	Standard	1999-04-06	Valid
N705NC	Beech 58	Fixed-wing, multi-engine	Eagle Leasing INC Gaylord, Michigan	Standard	1999-04-06	Valid
N70219	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Multiple	1999-03-31	Valid
N9749G	Cessna A188B	Fixed-wing, single engine	3 B Farms INC Pinetown, North Carolina	Restricted	1999-03-29	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