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
N2132L	Beech V35B	Fixed-wing, single engine	Csrh Ventures LLC Lubbock, Texas	Standard	2020-12-10	Valid
N38WB	Beech A36	Fixed-wing, single engine	Eighttwotwo LLC Wilmington, Delaware	Standard	2020-12-10	Valid
N715BC	Beech A36	Fixed-wing, single engine	Individual owner	Standard	2020-12-10	Valid
N322SP	Beech D55	Fixed-wing, multi-engine	Co-owned owner Tennessee	Standard	2020-12-09	Valid
N436E	Beech S35	Fixed-wing, single engine	Individual owner Florida	Standard	2020-12-09	Valid
N3115W	Beech A36	Fixed-wing, single engine	Co-owned owner Tennessee	Standard	2020-12-08	Valid
N822TM	Cessna A185F	Fixed-wing, single engine	Mercer Investment Company LLC Bakersfield, California	Standard	2020-12-08	Valid
N87K	Beech S35	Fixed-wing, single engine	Sockey Investments LLC Poteau, Oklahoma	Standard	2020-12-08	Valid
N18752	Beech 58	Fixed-wing, multi-engine	Morgantown Flying Club LLC Morgantown, West Virginia	Standard	2020-12-07	Valid
N4550Q	Cessna 402A	Fixed-wing, multi-engine	Island Wings INC Fort Lauderdale, Florida	Standard	2020-12-07	Valid
N6096S	Beech 58	Fixed-wing, multi-engine	Co-owned owner California	Standard	2020-12-07	Valid
N2199L	Beech A36	Fixed-wing, single engine	Individual owner Michigan	Standard	2020-12-04	Valid
N310CJ	Cessna 310R	Fixed-wing, multi-engine	Cj Marketing INC Saint John, Indiana	Standard	2020-12-03	Valid
N455FP	Beech D55	Fixed-wing, multi-engine	Robert Corio INC Johnston, Rhode Island	Standard	2020-12-03	Valid
N4608A	Beech A36	Fixed-wing, single engine	Triplett Robert J Cameron, Wisconsin	Standard	2020-12-02	Valid
N6625V	Bellanca 17-30A	Fixed-wing, single engine	Individual owner California	Standard	2020-11-30	Valid
N1830F	Beech A36	Fixed-wing, single engine	Co-owned owner Arkansas	Standard	2020-11-24	Valid
N2774T	Beech V35	Fixed-wing, single engine	Olson Electrical Services Reno, Nevada	Standard	2020-11-21	Valid
N4946V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Michigan	Standard	2020-11-21	Valid
N940R	Beech E-55	Fixed-wing, multi-engine	Co-owned owner Kentucky	Standard	2020-11-21	Valid
N99EM	Beech 35-C33A	Fixed-wing, single engine	Freedom Alliance LLC Olathe, Kansas	Standard	2020-11-21	Valid
N475EC	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2020-11-20	Valid
N25JC	Cessna 210	Fixed-wing, single engine	Avg LLC Chico, California	Experimental	2020-11-19	Valid
N6857R	Cessna T210G	Fixed-wing, single engine	Withheld at owner's request	Standard	2020-11-19	Valid
N8310N	Beech E33A	Fixed-wing, single engine	Individual owner Tennessee	Standard	2020-11-19	Valid
N9302Q	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2020-11-19	Valid
N9620Q	Cessna A185F	Fixed-wing, single engine	Individual owner Idaho	Restricted	2020-11-19	Valid
N2916T	Aero Commander 200D	Fixed-wing, single engine	Co-owned owner Texas	Standard	2020-11-18	Valid
N342U	Beech V35B	Fixed-wing, single engine	Individual owner New Mexico	Standard	2020-11-18	Valid
N4076Q	Cessna 401	Fixed-wing, multi-engine	Individual owner New York	Standard	2020-11-18	Valid
N77JS	Cessna 310R	Fixed-wing, multi-engine	Sol Aerial Surveys LLC Las Vegas, Nevada	Standard	2020-11-18	Valid
N8393N	Beech V35A	Fixed-wing, single engine	Ja Mar Flight Services INC Anderson, Indiana	Standard	2020-11-18	Valid
N3360S	Cessna 210J	Fixed-wing, single engine	Individual owner California	Standard	2020-11-17	Valid
N18296	Beech 58	Fixed-wing, multi-engine	Star Flight Aviation INC Shreveport, Louisiana	Standard	2020-11-16	Valid
N2028A	Beech V35A	Fixed-wing, single engine	Individual owner California	Standard	2020-11-16	Valid
N4474S	Beech A36	Fixed-wing, single engine	Tailwind Aviation LLC New Rochelle, New York	Standard	2020-11-14	Valid
N4590S	Beech 58	Fixed-wing, multi-engine	Individual owner Tennessee	Standard	2020-11-14	Valid
N1954U	Cessna A185E	Fixed-wing, single engine	Aircraft Structural Repair INC Hamilton, Montana	Standard	2020-11-13	Valid
N234JS	Cessna A185F	Fixed-wing, single engine	Ocean Blue Aviation LLC Farmingdale, New York	Standard	2020-11-13	Valid
N9293Q	Beech V35B	Fixed-wing, single engine	Chalk 2 INC Apple Valley, California	Standard	2020-11-13	Valid
N2036P	Beech A36	Fixed-wing, single engine	That Fly Family LLC Nicholls, Georgia	Standard	2020-11-10	Valid
N6138F	Cessna 210H	Fixed-wing, single engine	Individual owner Nebraska	Standard	2020-11-09	Valid
N61RW	Cessna 320E	Fixed-wing, multi-engine	Sol Aerial Surveys LLC Las Vegas, Nevada	Standard	2020-11-09	Valid
N310TV	Beech A36	Fixed-wing, single engine	Haushold Aviation LLC Shelbyville, Tennessee	Standard	2020-11-07	Valid
N3319J	Cessna A188B	Fixed-wing, single engine	Individual owner Florida	Restricted	2020-11-07	Valid
N725VP	Cessna U206	Fixed-wing, single engine	Team Negrich LLC Osteen, Florida	Standard	2020-11-07	Valid
N4157S	Beech F33A	Fixed-wing, single engine	Co-owned owner Arizona	Standard	2020-11-06	Valid
N423CL	Beech 58	Fixed-wing, multi-engine	Tmt Aero INC Perrysburg, Ohio	Standard	2020-11-06	Valid
N144SB	Beech F33A	Fixed-wing, single engine	Peters Aircraft Sales Flp Wshngtn Ct Hs, Ohio	Standard	2020-11-05	Valid
N9752Z	Cessna U206G	Fixed-wing, single engine	Rocky Pointe Logistics LLC Hayden, Idaho	Standard	2020-11-05	Valid
N544V	Beech S35	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2020-11-04	Valid
N6851R	Cessna T210G	Fixed-wing, single engine	6851R LLC Greeley, Colorado	Standard	2020-11-04	Valid
N117EC	Beech A36	Fixed-wing, single engine	Rambana & Ricci Pllc Tallahassee, Florida	Standard	2020-11-03	Valid
N1852F	Cessna 210F	Fixed-wing, single engine	Symbot Management INC Dover, Delaware	Standard	2020-11-03	Reports overdue
N266JD	Beech A45	Fixed-wing, single engine	J D Deboskey INC Palm Beach Gardens, Florida	Standard	2020-11-03	Valid
N3873B	Beech 58	Fixed-wing, multi-engine	Npa Baron LLC Gladewater, Texas	Standard	2020-11-03	Valid
N87208	Cessna 310R	Fixed-wing, multi-engine	Individual owner Florida	Standard	2020-11-03	Valid
N2ZW	Beech G35	Fixed-wing, single engine	Co-owned owner Indiana	Standard	2020-11-02	Valid
N334PW	Beech F33A	Fixed-wing, single engine	Gary Bass Restorations LLC Monett, Missouri	Standard	2020-11-02	Valid
N5742M	Cessna T-310P	Fixed-wing, multi-engine	American Aerial Survey INC Rancho Murieta, California	Standard	2020-11-02	Valid
N1057W	Beech A36	Fixed-wing, single engine	Individual owner Tennessee	Standard	2020-10-30	Valid
N951MM	Beech V35B	Fixed-wing, single engine	Individual owner North Carolina	Standard	2020-10-29	Valid
N1043W	Beech F33A	Fixed-wing, single engine	Latitude Aviation LLC Cedar Rapids, Iowa	Standard	2020-10-28	Valid
N104TR	Cessna A185F	Fixed-wing, single engine	Auburn Sheet Metal INC Enumclaw, Washington	Standard	2020-10-24	Valid
N1099W	Beech A36	Fixed-wing, single engine	Top Hand INC Laurel, Montana	Standard	2020-10-24	Valid
N44TL	Bellanca 17-30A	Fixed-wing, single engine	Eco-Logic Environmental Engineering INC Placentia, California	Standard	2020-10-24	Valid
N5783K	Beech S35	Fixed-wing, single engine	Individual owner New Mexico	Standard	2020-10-23	Valid
N29DC	Beech S35	Fixed-wing, single engine	Dwlg Aviation LLC Rogers, Arkansas	Standard	2020-10-22	Valid
N5217E	Cessna A185F	Fixed-wing, single engine	Individual owner Maine	Multiple	2020-10-22	Valid
N766M	Cessna A185E	Fixed-wing, single engine	Individual owner Utah	Restricted	2020-10-22	Valid
N3080B	Beech F33A	Fixed-wing, single engine	Individual owner Ohio	Standard	2020-10-21	Valid
N3701D	Beech 58	Fixed-wing, multi-engine	N3701D LLC Wilmington, North Carolina	Standard	2020-10-21	Valid
N3958A	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2020-10-20	Valid
N2093W	Beech V35	Fixed-wing, single engine	Co-owned owner Montana	Standard	2020-10-19	Valid
N73067	Cessna 207A	Fixed-wing, single engine	Grant Aviation INC Anchorage, Alaska	Standard	2020-10-19	Valid
N7384U	Cessna 207A	Fixed-wing, single engine	Grant Aviation INC Anchorage, Alaska	Standard	2020-10-19	Valid
N57RB	Beech A36	Fixed-wing, single engine	Individual owner Washington	Standard	2020-10-17	Valid
N8112T	Beech F33A	Fixed-wing, single engine	Simply Living LLC Fort Myers, Florida	Standard	2020-10-15	Valid
N47JT	Beech V35B	Fixed-wing, single engine	M & M Investments of Jonesboro LLC Jonesboro, Arkansas	Standard	2020-10-14	Valid
N635AP	Beech V35B	Fixed-wing, single engine	Individual owner New Mexico	Standard	2020-10-14	Valid
N714JR	Beech S35	Fixed-wing, single engine	Co-owned owner California	Standard	2020-10-14	Valid
N774DF	Beech S35	Fixed-wing, single engine	Eclipse Aviation LLC Las Vegas, Nevada	Standard	2020-10-14	Valid
N25704	Beech A36	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2020-10-13	Valid
N8273Q	Cessna U206F	Fixed-wing, single engine	Individual owner Alaska	Standard	2020-10-08	Valid
N6677V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Montana	Standard	2020-10-07	Valid
N86K	Navion NAVION H	Fixed-wing, single engine	Southwest Aircraft LLC Fairacres, New Mexico	Standard	2020-10-07	Valid
N97WS	Beech A36	Fixed-wing, single engine	Prestige Worldwide Enterprises LLC Germantown, Tennessee	Standard	2020-10-07	Valid
N1830S	Beech A36	Fixed-wing, single engine	N1830S Aviation LLC Gainesville, Georgia	Standard	2020-10-06	Valid
N33HN	Beech 35-C33A	Fixed-wing, single engine	Palmer Airmotive INC Lockport, New York	Standard	2020-10-06	Valid
N5073J	Cessna 310R	Fixed-wing, multi-engine	Co-owned owner Tennessee	Standard	2020-10-06	Valid
N74BV	Bellanca 17-30A	Fixed-wing, single engine	Individual owner North Carolina	Standard	2020-10-06	Valid
N912HF	Beech F33A	Fixed-wing, single engine	Mcs Aviation LLC Sylvania, Ohio	Standard	2020-10-06	Valid
N60VA	Cessna A185F	Fixed-wing, single engine	Flying Rhino Aviation LTD Alliance, Nebraska	Standard	2020-10-05	Valid
N135KC	Beech F33A	Fixed-wing, single engine	Individual owner North Carolina	Standard	2020-10-02	Valid
N14793	Bellanca 17-30A	Fixed-wing, single engine	Clinton M Ward PC Vinita, Oklahoma	Standard	2020-10-01	Valid
N23CF	Cessna 207	Fixed-wing, single engine	Yr-Aircraft Leasing LLC Bethel, Alaska	Standard	2020-10-01	Valid
N327CT	Cessna 207A	Fixed-wing, single engine	Yr-Aircraft Leasing LLC Bethel, Alaska	Standard	2020-10-01	Valid
N33RM	Beech F33A	Fixed-wing, single engine	Co-owned owner New York	Standard	2020-10-01	Valid
N6207H	Cessna 207A	Fixed-wing, single engine	Yr-Aircraft Leasing LLC Bethel, Alaska	Standard	2020-10-01	Valid
N7320U	Cessna 207A	Fixed-wing, single engine	Yr-Aircraft Leasing LLC Bethel, Alaska	Standard	2020-10-01	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