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
N79CC	Beech D55	Fixed-wing, multi-engine	N79Cc LLC Paragould, Arkansas	Standard	2012-07-03	Valid
N761KL	Cessna 210M	Fixed-wing, single engine	Individual owner North Carolina	Standard	2012-07-02	Valid
N9004S	Beech S35	Fixed-wing, single engine	Morris AG Air & Sons INC Orovada, Nevada	Standard	2012-06-26	Valid
N185PD	Cessna A185F	Fixed-wing, single engine	Individual owner Maine	Standard	2012-06-25	Valid
N2441T	Navion NAVION G	Fixed-wing, single engine	Individual owner Michigan	Standard	2012-06-22	Valid
N39843	Bellanca 17-30A	Fixed-wing, single engine	Individual owner South Carolina	Standard	2012-06-22	Valid
N55TL	Beech E-55	Fixed-wing, multi-engine	Withheld at owner's request	Standard	2012-06-20	Valid
N2690A	Beech A36	Fixed-wing, single engine	Individual owner Ohio	Standard	2012-06-19	Valid
N3371L	Cessna A185E	Fixed-wing, single engine	Co-owned owner California	Standard	2012-06-19	Valid
N4911C	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2012-06-19	Valid
N8644Z	Cessna P206C	Fixed-wing, single engine	Masters Mission Nenana, Alaska	Standard	2012-06-19	Valid
N91K	Beech V35B	Fixed-wing, single engine	Mj Aviation INC Custer, South Dakota	Standard	2012-06-19	Valid
N36RF	Beech A36	Fixed-wing, single engine	Beverly Air Transport CO Chicago, Illinois	Standard	2012-06-13	Valid
N27MT	Beech 58	Fixed-wing, multi-engine	Flying Dog Aviation LLC Swanton, Ohio	Standard	2012-06-12	Valid
N777Y	Beech V35	Fixed-wing, single engine	Aerotrack INC Hemet, California	Standard	2012-06-12	Valid
N2284L	Beech A36	Fixed-wing, single engine	Individual owner North Carolina	Standard	2012-06-11	Valid
N81ZH	Cessna 210M	Fixed-wing, single engine	Carlsbad Raceway CORP Hemet, California	Standard	2012-06-06	Valid
N210FG	Cessna 210M	Fixed-wing, single engine	Glover Properties LLC Mount Pleasant, Texas	Standard	2012-06-05	Valid
N131DD	Beech V35B	Fixed-wing, single engine	Life Investors Aviation LLC Milwaukee, Wisconsin	Standard	2012-05-31	Valid
N743H	Cessna U206	Fixed-wing, single engine	Co-owned owner Montana	Standard	2012-05-31	Valid
N2025N	Beech A36	Fixed-wing, single engine	A B C Leasing INC Oakdale, Louisiana	Standard	2012-05-30	Valid
N442SS	Cessna P206	Fixed-wing, single engine	N442Ss LLC Middletown, Ohio	Standard	2012-05-29	Valid
N2772J	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Standard	2012-05-22	Valid
N3077W	Beech A36	Fixed-wing, single engine	Wipaire INC South Saint Paul, Minnesota	Standard	2012-05-22	Valid
N185HB	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2012-05-17	Valid
N2228S	Cessna 210L	Fixed-wing, single engine	Co-owned owner Michigan	Standard	2012-05-16	Valid
N30RP	Beech A36	Fixed-wing, single engine	Communications Laboratories INC Melbourne, Florida	Standard	2012-05-16	Valid
N913KM	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	2012-05-15	Valid
N3417Q	Cessna 320E	Fixed-wing, multi-engine	Individual owner California	Standard	2012-05-14	Valid
N70712	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Multiple	2012-05-11	Valid
N89EL	Bellanca 17-30A	Fixed-wing, single engine	Co-owned owner California	Standard	2012-05-10	Valid
N4056S	Beech A36	Fixed-wing, single engine	Individual owner Illinois	Standard	2012-05-08	Valid
N1872L	Beech F33A	Fixed-wing, single engine	Co-owned owner Georgia	Standard	2012-05-07	Valid
N9178G	Cessna U206G	Fixed-wing, single engine	Ursus Air Services Anchorage, Alaska	Standard	2012-05-07	Valid
N2139F	Cessna U206	Fixed-wing, single engine	Individual owner Washington	Standard	2012-05-04	Valid
N8711Z	Cessna P206C	Fixed-wing, single engine	Co-owned owner Texas	Standard	2012-05-03	Valid
N3041W	Beech V35A	Fixed-wing, single engine	Estes Aviation LLC Rapid City, South Dakota	Standard	2012-05-02	Valid
N3741C	Beech A36	Fixed-wing, single engine	Omr Investments LLC Dawson, Georgia	Standard	2012-05-02	Valid
N62BJ	Beech V35B	Fixed-wing, single engine	Capital Dental Management INC Dover, Delaware	Standard	2012-04-30	Valid
N26692	Cessna 310R	Fixed-wing, multi-engine	Individual owner New York	Standard	2012-04-27	Valid
N2049Z	Beech A36	Fixed-wing, single engine	Co-owned owner Montana	Standard	2012-04-26	Valid
N638LD	Beech 58	Fixed-wing, multi-engine	Dion Aviation LLC Key West, Florida	Standard	2012-04-26	Valid
N185WV	Cessna A185F	Fixed-wing, single engine	Scenic Air LLC Kalispell, Montana	Standard	2012-04-25	Valid
N772RF	Cessna TU206B	Fixed-wing, single engine	Individual owner Alaska	Standard	2012-04-25	Valid
N10AR	Cessna TU206B	Fixed-wing, single engine	K Airmotive LLC St Helens, Oregon	Standard	2012-04-24	Valid
N5747K	Beech S35	Fixed-wing, single engine	Del Martin LP Spring, Texas	Standard	2012-04-23	Valid
N4890R	Cessna A188B	Fixed-wing, single engine	Rebecca Lynn Flying Service INC Livingston, New York	Restricted	2012-04-18	Valid
N398EP	Beech A36	Fixed-wing, single engine	Jg'S Mallardaire LLC Benton, Arkansas	Standard	2012-04-16	Valid
N777BV	Beech E-55	Fixed-wing, multi-engine	Co-owned owner Texas	Standard	2012-04-16	Valid
N24RA	Beech F33A	Fixed-wing, single engine	Individual owner North Carolina	Standard	2012-04-14	Valid
N962RG	Cessna U206C	Fixed-wing, single engine	Individual owner Arizona	Standard	2012-04-14	Valid
N15A	Beech 95-C55	Fixed-wing, multi-engine	Doug Harris Aviation LLC Pryor, Oklahoma	Standard	2012-04-11	Valid
N249Y	Beech E33A	Fixed-wing, single engine	Individual owner Texas	Standard	2012-04-10	Valid
N732QA	Cessna 210M	Fixed-wing, single engine	International Air Services INC Trustee Carson City, Nevada	Standard	2012-04-10	Valid
N7710R	Beech 36	Fixed-wing, single engine	Beechcraft Heritage Museum Tullahoma, Tennessee	Special flight permit	2012-04-02	Valid
N25627	Beech 58	Fixed-wing, multi-engine	Co-owned owner Arkansas	Standard	2012-03-30	Valid
N440SU	Beech A36	Fixed-wing, single engine	Individual owner Florida	Standard	2012-03-30	Valid
N61616	Cessna A185F	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2012-03-28	Valid
N2971T	Aero Commander 200D	Fixed-wing, single engine	Individual owner North Carolina	Standard	2012-03-23	Valid
N8942U	Beech S35	Fixed-wing, single engine	Individual owner Texas	Standard	2012-03-23	Valid
N990TS	Beech F33A	Fixed-wing, single engine	Kem Investments LLC Wichita, Kansas	Standard	2012-03-23	Valid
N829G	Beech 95-C55	Fixed-wing, multi-engine	Win Win Aviation INC Wake Forest, North Carolina	Standard	2012-03-21	Valid
N1588M	Cessna A188A	Fixed-wing, single engine	Anderson Aerial Spraying Service INC Canby, Minnesota	Multiple	2012-03-19	Valid
N8732Z	Cessna P206D	Fixed-wing, single engine	Individual owner Georgia	Standard	2012-03-19	Valid
N4496Q	Cessna A188B	Fixed-wing, single engine	Individual owner North Carolina	Restricted	2012-03-16	Valid
N5206U	Cessna 206	Fixed-wing, single engine	Mudminers LLC Wasilla, Alaska	Standard	2012-03-16	Valid
N9812G	Cessna A188B	Fixed-wing, single engine	Individual owner North Carolina	Restricted	2012-03-16	Valid
N8126N	Beech F33A	Fixed-wing, single engine	Hyder/Zemke LLC Albuquerque, New Mexico	Standard	2012-03-15	Valid
N833	Beech F33A	Fixed-wing, single engine	Individual owner Oregon	Standard	2012-03-15	Valid
N359DA	Cessna U206G	Fixed-wing, single engine	Cessna 359Da LLC Warsaw, Virginia	Standard	2012-03-14	Valid
N17568	Beech V35B	Fixed-wing, single engine	Chance Research CORP Mineral Wells, Texas	Standard	2012-03-07	Valid
N7053N	Beech V35A	Fixed-wing, single engine	Individual owner Oregon	Standard	2012-03-02	Valid
N9491Q	Beech A36	Fixed-wing, single engine	Mcclung Aerial Spraying INC Big Springs, Nebraska	Standard	2012-03-02	Valid
N2035R	Beech A36	Fixed-wing, single engine	Arizona Skyraiders LLC Phoenix, Arizona	Standard	2012-03-01	Valid
N80RW	Beech A36	Fixed-wing, single engine	W & G Aviation INC College Station, Texas	Standard	2012-02-29	Valid
N1694R	Cessna A185F	Fixed-wing, single engine	Crow Rock LLC Stillwater, Minnesota	Standard	2012-02-28	Valid
N455DC	Beech E33C	Fixed-wing, single engine	Aviation Safety Training International LLC Butte, Montana	Standard	2012-02-27	Valid
N93027	Cessna A185F	Fixed-wing, single engine	Indy Air LLC Blaine, Minnesota	Standard	2012-02-27	Valid
N7687N	Beech 36	Fixed-wing, single engine	Freedom Flying INC Wilmington, Delaware	Standard	2012-02-25	Valid
N89LS	Beech F33A	Fixed-wing, single engine	Cals LTD Harbor Springs, Michigan	Standard	2012-02-25	Valid
N5842T	Cessna 185C	Fixed-wing, single engine	Arapaho Air LLC Walnut Grove, California	Standard	2012-02-24	Valid
N7737R	Beech V35A	Fixed-wing, single engine	Individual owner Tennessee	Standard	2012-02-21	Valid
N3903Q	Cessna A185F	Fixed-wing, single engine	Washington Chinook LLC Bellingham, Washington	Standard	2012-02-16	Valid
N95DP	Beech E-55	Fixed-wing, multi-engine	Northwest Aviation INC Oklahoma City, Oklahoma	Standard	2012-02-16	Valid
N1032W	Beech V35B	Fixed-wing, single engine	Co-owned owner Ohio	Standard	2012-02-15	Valid
N8919U	Beech 35-C33	Fixed-wing, single engine	Individual owner Texas	Standard	2012-02-15	Valid
N348S	Beech V35B	Fixed-wing, single engine	Koritz Iowa Properties LLC Key Colony Beach, Florida	Standard	2012-02-13	Valid
N5863J	Beech S35	Fixed-wing, single engine	Individual owner Kansas	Standard	2012-02-09	Valid
N58UA	Beech 58	Fixed-wing, multi-engine	Tunica Air INC Tunica, Mississippi	Standard	2012-02-07	Valid
N6659L	Beech V35B	Fixed-wing, single engine	Control Data INC Indianapolis, Indiana	Standard	2012-02-07	Valid
N761SF	Cessna 210M	Fixed-wing, single engine	Paramount Enterprises INC Goldsboro, North Carolina	Standard	2012-02-06	Valid
N7549N	Beech 36	Fixed-wing, single engine	Individual owner Texas	Standard	2012-02-03	Valid
N24192	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2012-02-02	Valid
N268DL	Cessna P206D	Fixed-wing, single engine	Individual owner North Carolina	Standard	2012-02-02	Valid
N171RP	Beech V35B	Fixed-wing, single engine	Rosales Partners Air LLC Austin, Texas	Standard	2012-01-30	Valid
N2669X	Cessna P206A	Fixed-wing, single engine	Skydive Ricks LLC Petersburg, Ohio	Standard	2012-01-30	Valid
N4740F	Cessna P206B	Fixed-wing, single engine	Skydive Ricks LLC Petersburg, Ohio	Standard	2012-01-30	Valid
N70206	Cessna A185E	Fixed-wing, single engine	Individual owner Washington	Standard	2012-01-30	Valid
N1922T	Cessna T210K	Fixed-wing, single engine	Individual owner Minnesota	Standard	2012-01-27	Valid
N6735Z	Beech A36	Fixed-wing, single engine	Gta Air INC Addison, Texas	Standard	2012-01-26	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