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
N732FJ	Cessna 210L	Fixed-wing, single engine	Irf LLC Boonton Township, New Jersey	Standard	2011-08-01	Valid
N66518	Beech 58	Fixed-wing, multi-engine	Co-owned owner Florida	Standard	2011-07-29	Valid
N2226R	Cessna T210H	Fixed-wing, single engine	Champion Crane Service INC Des Moines, Iowa	Standard	2011-07-25	Valid
N7645N	Beech 36	Fixed-wing, single engine	Four Five November LLC Helena, Montana	Standard	2011-07-23	Valid
N88YY	Beech 35-C33A	Fixed-wing, single engine	Individual owner Arizona	Standard	2011-07-23	Valid
N185CD	Cessna A185F	Fixed-wing, single engine	Kawak Aviation LLC Seattle, Washington	Standard	2011-07-21	Valid
N214Q	Beech S35	Fixed-wing, single engine	Hassenger Management Strategies INC San Antonio, Texas	Standard	2011-07-20	Valid
N480A	Beech 36	Fixed-wing, single engine	Individual owner Iowa	Standard	2011-07-20	Valid
N6656R	Beech V35B	Fixed-wing, single engine	Individual owner New Jersey	Standard	2011-07-20	Valid
N8321N	Beech V35A	Fixed-wing, single engine	Individual owner Michigan	Standard	2011-07-19	Valid
N484D	Beech F33A	Fixed-wing, single engine	Alman INC Fort Lauderdale, Florida	Standard	2011-07-15	Valid
N5846K	Beech S35	Fixed-wing, single engine	Individual owner Texas	Standard	2011-07-14	Valid
N35806	Cessna 210L	Fixed-wing, single engine	Air Dakota Flite INC Hettinger, North Dakota	Standard	2011-07-13	Valid
N8241M	Cessna 210K	Fixed-wing, single engine	Individual owner Maine	Standard	2011-07-13	Valid
N8486N	Beech 36	Fixed-wing, single engine	Toledo Jet Center LLC Swanton, Ohio	Standard	2011-07-13	Valid
N1468M	Cessna U206E	Fixed-wing, single engine	Arctic Barnabas Ministries Kenai, Alaska	Standard	2011-07-12	Valid
N620Z	Beech 58	Fixed-wing, multi-engine	Six Twenty Zulu Aviation LLC Wilmington, Delaware	Standard	2011-07-12	Valid
N966DE	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2011-07-11	Valid
N1805L	Beech V35B	Fixed-wing, single engine	Individual owner Arizona	Standard	2011-07-08	Valid
N535P	Beech V35	Fixed-wing, single engine	Individual owner North Carolina	Standard	2011-07-08	Valid
N22WL	Beech 35-C33A	Fixed-wing, single engine	Individual owner Colorado	Standard	2011-07-07	Valid
N354DZ	Beech V35B	Fixed-wing, single engine	Individual owner Connecticut	Standard	2011-07-07	Valid
N756PY	Cessna U206G	Fixed-wing, single engine	Associated Pilots INC Concord, Massachusetts	Restricted	2011-07-06	Valid
N9649E	Bellanca 17-30A	Fixed-wing, single engine	N9649E LLC Alexander, Arkansas	Standard	2011-06-30	Valid
N9932Z	Cessna U206G	Fixed-wing, single engine	Silver Creek Aviation Services Fort Worth, Texas	Standard	2011-06-30	Valid
N1972U	Cessna A185E	Fixed-wing, single engine	Individual owner Minnesota	Standard	2011-06-29	Valid
N2280B	Beech 58	Fixed-wing, multi-engine	Dream Flight Aviation LLC New Fairfield, Connecticut	Standard	2011-06-29	Valid
N1983U	Cessna A185E	Fixed-wing, single engine	Alpine Air LLC Cordova, Alaska	Standard	2011-06-28	Valid
N4431W	Beech V35B	Fixed-wing, single engine	United Roofing of Central Florida INC Ocala, Florida	Standard	2011-06-28	Valid
N11VG	Beech V35B	Fixed-wing, single engine	Sage Aviation LLC Saint Louis, Missouri	Standard	2011-06-27	Valid
N1690W	Beech V35B	Fixed-wing, single engine	Individual owner California	Standard	2011-06-27	Valid
N3991A	Beech F33A	Fixed-wing, single engine	Individual owner Texas	Standard	2011-06-27	Valid
N44ZM	Beech A36	Fixed-wing, single engine	Individual owner Missouri	Standard	2011-06-27	Valid
N331RH	Beech F33A	Fixed-wing, single engine	White Wing Aviation LLC Shreveport, Louisiana	Standard	2011-06-24	Valid
N24187	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Standard	2011-06-21	Valid
N1625W	Beech V35B	Fixed-wing, single engine	Gunter Professional Pilot Services LLC Wichita Falls, Texas	Standard	2011-06-18	Valid
N6265V	Beech V35	Fixed-wing, single engine	Co-owned owner Texas	Standard	2011-06-18	Valid
N93135	Cessna 210L	Fixed-wing, single engine	Individual owner Mississippi	Standard	2011-06-16	Valid
N3007W	Beech 58	Fixed-wing, multi-engine	Lima Mike INC Ham Lake, Minnesota	Standard	2011-06-14	Valid
N7794R	Beech 36	Fixed-wing, single engine	Cherokee Aviation LLC New Smyrna Beach, Florida	Standard	2011-06-14	Valid
N1BF	Beech E-55	Fixed-wing, multi-engine	Russell Kellum LLC Saratoga, California	Standard	2011-06-13	Valid
N8MW	Beech V35B	Fixed-wing, single engine	Individual owner Arizona	Standard	2011-06-13	Valid
N36YS	Beech A36	Fixed-wing, single engine	Slow Roll LLC Gainesville, Florida	Standard	2011-06-09	Valid
N4596U	Cessna U206G	Fixed-wing, single engine	Rustair INC Anchorage, Alaska	Restricted	2011-06-09	Valid
N4891Z	Cessna U206G	Fixed-wing, single engine	Rustair INC Anchorage, Alaska	Multiple	2011-06-09	Valid
N9146M	Cessna U206E	Fixed-wing, single engine	Jc Aircraft Leasing LLC Wasilla, Alaska	Standard	2011-06-08	Valid
N66896	Beech A36	Fixed-wing, single engine	Individual owner Ohio	Standard	2011-06-07	Valid
N9581H	Cessna A185F	Fixed-wing, single engine	Individual owner Colorado	Standard	2011-06-02	Valid
N2DC	Beech S35	Fixed-wing, single engine	Individual owner Arizona	Standard	2011-06-01	Valid
N468SR	Beech E33A	Fixed-wing, single engine	Individual owner Nevada	Standard	2011-05-26	Valid
N3081T	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	2011-05-25	Valid
N144A	Beech V35B	Fixed-wing, single engine	Co-owned owner California	Standard	2011-05-24	Valid
N4505S	Beech F33A	Fixed-wing, single engine	Go Flyers LLC Sudbury, Massachusetts	Standard	2011-05-24	Valid
N7920M	Beech A36	Fixed-wing, single engine	Individual owner Arizona	Standard	2011-05-23	Valid
N904AD	Beech A36	Fixed-wing, single engine	North South Aviation LLC Belgrade Lakes, Maine	Standard	2011-05-23	Valid
N1314U	Cessna 210N	Fixed-wing, single engine	Individual owner Alabama	Standard	2011-05-20	Valid
N6048G	Cessna A188B	Fixed-wing, single engine	Individual owner Nebraska	Restricted	2011-05-20	Valid
N6658K	Beech V35B	Fixed-wing, single engine	Individual owner New York	Standard	2011-05-20	Valid
N4082B	Bellanca 17-30A	Fixed-wing, single engine	Jdj INC Mountain Home, Arkansas	Standard	2011-05-19	Valid
N35859	Cessna U206F	Fixed-wing, single engine	Hooper Ranch LLC Elko, Nevada	Standard	2011-05-17	Valid
N4786Q	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2011-05-16	Valid
N3JU	Meyers Industries Inc 200B	Fixed-wing, single engine	Individual owner California	Standard	2011-05-14	Valid
N66878	Beech 58	Fixed-wing, multi-engine	Cool Blue Air LLC Wilmington, Delaware	Standard	2011-05-14	Valid
N4XC	Cessna A185F	Fixed-wing, single engine	Minnehan Land & Cattle CO Joplin, Montana	Standard	2011-05-13	Valid
N4778F	Cessna P206B	Fixed-wing, single engine	Pond Engineering Laboratories INC Berthoud, Colorado	Standard	2011-05-10	Valid
N4970Q	Cessna A188B	Fixed-wing, single engine	Pettis AG Aviation LLC Atlantic, Iowa	Restricted	2011-05-10	Valid
N8945U	Beech S35	Fixed-wing, single engine	Co-owned owner Ohio	Standard	2011-05-09	Valid
N691RB	Beech V35A	Fixed-wing, single engine	Pali INC Nashville, Tennessee	Standard	2011-05-06	Valid
N210LX	Cessna 210L	Fixed-wing, single engine	Individual owner Arizona	Standard	2011-05-04	Valid
N1232F	Cessna A185F	Fixed-wing, single engine	Lloyd Land Plane I LLC Brighton, Colorado	Standard	2011-05-03	Valid
N206MM	Cessna U206F	Fixed-wing, single engine	Individual owner North Dakota	Standard	2011-05-03	Valid
N70148	Cessna A185E	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2011-05-02	Valid
N4802V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2011-04-30	Valid
N793AK	Cessna A185F	Fixed-wing, single engine	Acme Skywagon LLC Idabel, Oklahoma	Standard	2011-04-30	Valid
N444WR	Beech V35B	Fixed-wing, single engine	Co-owned owner Tennessee	Standard	2011-04-29	Valid
N10MN	Beech E-55	Fixed-wing, multi-engine	Aircraft Sales of America LLC Fenton, Michigan	Standard	2011-04-28	Valid
N5008C	Beech B35	Fixed-wing, single engine	Individual owner California	Standard	2011-04-28	Valid
N2510T	Navion NAVION H	Fixed-wing, single engine	N2510Tango LLC Corona, California	Standard	2011-04-25	Valid
N36GB	Cessna U206F	Fixed-wing, single engine	Smokey Bay Air INC Homer, Alaska	Standard	2011-04-19	Valid
N3458G	Cessna 310R	Fixed-wing, multi-engine	American Aircraft Sales LLC Livermore, California	Standard	2011-04-18	Valid
N6492H	Cessna 207A	Fixed-wing, single engine	Spernak Airways INC Anchorage, Alaska	Standard	2011-04-18	Valid
N73047	Cessna 207A	Fixed-wing, single engine	Spernak Airways INC Anchorage, Alaska	Standard	2011-04-18	Valid
N7392U	Cessna 207A	Fixed-wing, single engine	Spernak Airways INC Anchorage, Alaska	Standard	2011-04-18	Valid
N633CK	Beech F33A	Fixed-wing, single engine	Individual owner North Carolina	Standard	2011-04-16	Valid
N8944M	Beech S35	Fixed-wing, single engine	Co-owned owner California	Standard	2011-04-16	Valid
N942JM	Cessna U206F	Fixed-wing, single engine	Individual owner Alaska	Standard	2011-04-16	Valid
N270K	Beech F33A	Fixed-wing, single engine	First Gear INC Fort Wayne, Indiana	Standard	2011-04-15	Valid
N1ZP	Beech A36	Fixed-wing, single engine	Concord Flying Club INC Lafayette, California	Standard	2011-04-14	Valid
N334MB	Beech F33A	Fixed-wing, single engine	Co-owned owner Colorado	Standard	2011-04-13	Valid
N1036T	Beech A36	Fixed-wing, single engine	Co-owned owner Texas	Standard	2011-04-12	Valid
N170M	Beech V35	Fixed-wing, single engine	Individual owner Texas	Standard	2011-04-12	Valid
N3851Y	Cessna 210D	Fixed-wing, single engine	Co-owned owner Georgia	Standard	2011-04-12	Valid
N8366Q	Cessna U206F	Fixed-wing, single engine	Individual owner Alaska	Multiple	2011-04-06	Valid
N95RR	Beech A36	Fixed-wing, single engine	Kentucky Oil and Refining CO Betsy Layne, Kentucky	Standard	2011-04-06	Valid
N756SG	Cessna U206G	Fixed-wing, single engine	Waters Aero Marine INC South Thomaston, Maine	Standard	2011-04-01	Valid
N3BG	Beech V35A	Fixed-wing, single engine	Individual owner Alabama	Standard	2011-03-25	Valid
N5632S	Beech 95-C55	Fixed-wing, multi-engine	Individual owner Louisiana	Standard	2011-03-23	Valid
N129KT	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2011-03-21	Valid
N4983U	Cessna 210N	Fixed-wing, single engine	Emerald Coast Entertainment LLC Lewes, Delaware	Standard	2011-03-18	Valid
N185PS	Cessna A185F	Fixed-wing, single engine	Indian Point LLC Excelsior, Minnesota	Standard	2011-03-11	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