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
N600BB	Beech 58	Fixed-wing, multi-engine	Gat Air & Ground LLC Norwich, New York	Standard	2020-03-02	Valid
N8684Q	Beech S35	Fixed-wing, single engine	Individual owner Texas	Standard	2020-03-02	Valid
N2046W	Beech F33A	Fixed-wing, single engine	Kj Cessna LLC Waxahachie, Texas	Standard	2020-02-26	Valid
N3558F	Cessna A185E	Fixed-wing, single engine	Pacific Rim Adventures INC Los Olivos, California	Standard	2020-02-26	Valid
N786TS	Beech A36	Fixed-wing, single engine	Co-owned owner Maine	Standard	2020-02-26	Valid
N8256Q	Cessna U206F	Fixed-wing, single engine	Withheld at owner's request	Standard	2020-02-25	Valid
N9489S	Beech 95-C55	Fixed-wing, multi-engine	Individual owner Florida	Standard	2020-02-25	Valid
N1SK	Beech V35B	Fixed-wing, single engine	Co-owned owner Oregon	Standard	2020-02-24	Valid
N2132F	Cessna U206	Fixed-wing, single engine	Co-owned owner Tennessee	Standard	2020-02-24	Valid
N8210M	Cessna 210K	Fixed-wing, single engine	Individual owner Florida	Standard	2020-02-24	Valid
N185DW	Cessna A185E	Fixed-wing, single engine	Individual owner Washington	Standard	2020-02-21	Valid
N997J	Beech F33A	Fixed-wing, single engine	S & C Aero LLC Collierville, Tennessee	Standard	2020-02-21	Valid
N5072U	Cessna 206	Fixed-wing, single engine	Individual owner Montana	Standard	2020-02-19	Valid
N8371N	Beech V35A	Fixed-wing, single engine	Decision Air CORP Wilmington, Delaware	Standard	2020-02-19	Valid
N787JV	Beech V35B	Fixed-wing, single engine		Standard	2020-02-18	Valid
N7917R	Beech V35A	Fixed-wing, single engine	Ph Air LLC Turners Falls, Massachusetts	Standard	2020-02-14	Valid
N2273L	Beech A36	Fixed-wing, single engine	Ltt Flights LLC Clinton, Missouri	Standard	2020-02-13	Valid
N4991F	Cessna TU206B	Fixed-wing, single engine	Individual owner Washington	Standard	2020-02-13	Valid
N57GW	Beech F33A	Fixed-wing, single engine	Individual owner Arizona	Standard	2020-02-13	Valid
N711TH	Beech A36	Fixed-wing, single engine	Tri-County Sprayers INC Hamlin, Texas	Standard	2020-02-13	Valid
N20572	Beech V35B	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2020-02-11	Valid
N3989G	Cessna U206C	Fixed-wing, single engine	Jsh Farms INC Hermiston, Oregon	Standard	2020-02-10	Valid
N6136V	Beech S35	Fixed-wing, single engine	Ccf Ventures INC Bangor, Maine	Standard	2020-02-10	Valid
N1893F	Cessna 210F	Fixed-wing, single engine	Individual owner Missouri	Standard	2020-02-04	Valid
N5303X	Cessna U206G	Fixed-wing, single engine	Redemption INC Kodiak, Alaska	Standard	2020-02-04	Valid
N6040F	Beech S35	Fixed-wing, single engine	Jct Holdings LLC Las Vegas, Nevada	Standard	2020-02-04	Valid
N269RA	Beech 58	Fixed-wing, multi-engine	Fuller Aire INC Wilmington, Delaware	Standard	2020-02-03	Valid
N1789	Cessna A185F	Fixed-wing, single engine	Individual owner North Dakota	Standard	2020-01-31	Valid
N359ER	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2020-01-31	Valid
N5037V	Cessna 210L	Fixed-wing, single engine	Poh Enterprises LLC Gardena, California	Standard	2020-01-31	Valid
N8796Q	Cessna U206G	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2020-01-31	Valid
N185NP	Cessna A185E	Fixed-wing, single engine	Individual owner Nevada	Standard	2020-01-30	Valid
N2043X	Beech A36	Fixed-wing, single engine	Wright Air Service INC Fairbanks, Alaska	Standard	2020-01-30	Valid
N4637U	Cessna U206G	Fixed-wing, single engine	Wright Air Service INC Fairbanks, Alaska	Standard	2020-01-30	Valid
N2871W	Beech 58	Fixed-wing, multi-engine	Individual owner New York	Standard	2020-01-29	Valid
N5844Y	Beech 58	Fixed-wing, multi-engine	Individual owner Georgia	Standard	2020-01-29	Valid
N6089S	Beech F33A	Fixed-wing, single engine	Co-owned owner Illinois	Standard	2020-01-28	Valid
N712SR	Bellanca 17-30	Fixed-wing, single engine	Individual owner Oregon	Standard	2020-01-28	Valid
N9112Q	Beech V35B	Fixed-wing, single engine	Skyward Mn LLC Hutchinson, Minnesota	Standard	2020-01-27	Valid
N4701Q	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Standard	2020-01-24	Valid
N9739E	Bellanca 17-30A	Fixed-wing, single engine	Withheld at owner's request	Standard	2020-01-23	Valid
N1836L	Beech A36	Fixed-wing, single engine	Flexjet LLC Cleveland, Ohio	Standard	2020-01-22	Valid
N8835M	Beech S35	Fixed-wing, single engine	Individual owner Louisiana	Standard	2020-01-22	Valid
N1529L	Beech F33A	Fixed-wing, single engine	Individual owner Illinois	Standard	2020-01-21	Valid
N87357	Cessna 310R	Fixed-wing, multi-engine	Qualitair LLC Trustee Michelstadt,	Standard	2020-01-17	Valid
N18CN	Beech E33A	Fixed-wing, single engine	Tab Flyers LLC Champaign, Illinois	Standard	2020-01-16	Valid
N2EY	Beech V35	Fixed-wing, single engine	Co-owned owner Arizona	Standard	2020-01-16	Valid
N4699F	Cessna P206A	Fixed-wing, single engine	Individual owner Idaho	Standard	2020-01-16	Valid
N6797R	Cessna T210F	Fixed-wing, single engine	Jts Management INC Lincoln, Nebraska	Standard	2020-01-16	Valid
N301DD	Cessna A185F	Fixed-wing, single engine	Rockalong Holdings LLC Stanton, Texas	Standard	2020-01-15	Valid
N3890Y	Cessna 210D	Fixed-wing, single engine	Individual owner Colorado	Standard	2020-01-15	Valid
N4045A	Beech V35B	Fixed-wing, single engine	Wdw Aviation Leasing INC Knoxville, Tennessee	Standard	2020-01-15	Valid
N86AG	Cessna 210L	Fixed-wing, single engine	Co-owned owner Texas	Standard	2020-01-15	Valid
N142F	Beech 95-C55	Fixed-wing, multi-engine	Individual owner West Virginia	Standard	2020-01-14	Valid
N1849L	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2020-01-13	Valid
N4572A	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2020-01-13	Valid
N6032R	Cessna A188B	Fixed-wing, single engine	Aerial Crop Protection INC Belle Glade, Florida	Restricted	2020-01-13	Valid
N6116R	Cessna T210F	Fixed-wing, single engine	Airxn LLC Williams, Arizona	Standard	2020-01-13	Valid
N6243C	Cessna 210N	Fixed-wing, single engine	Dcd Aircraft Sales LLC Leesburg, Florida	Standard	2020-01-13	Valid
N772R	Beech F33A	Fixed-wing, single engine	Maverick Bills LLC Wilmington, Delaware	Standard	2020-01-13	Valid
N7900K	Beech S35	Fixed-wing, single engine	Thykeson Air LLC Portland, North Dakota	Standard	2020-01-10	Valid
N1856F	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2020-01-09	Valid
N4810J	Beech V35	Fixed-wing, single engine	Individual owner Colorado	Standard	2020-01-09	Valid
N6247V	Beech V35A	Fixed-wing, single engine	Individual owner Florida	Standard	2020-01-09	Valid
N416JS	Beech 58	Fixed-wing, multi-engine	C Randy Landis Dds INC Oroville, California	Standard	2020-01-08	Valid
N185VV	Cessna A185F	Fixed-wing, single engine	Jetran LLC Horseshoe Bay, Texas	Standard	2020-01-07	Valid
N4914U	Cessna 210E	Fixed-wing, single engine	Caldwell Gregg P Desert Hot Springs, California	Standard	2020-01-07	Valid
N1567M	Beech F33A	Fixed-wing, single engine	Individual owner Florida	Standard	2020-01-06	Valid
N756DN	Cessna U206G	Fixed-wing, single engine	Skyler Aviation INC San Diego, California	Standard	2020-01-06	Valid
N210DC	Cessna 210L	Fixed-wing, single engine	Rrr Land & Cattle CO LLC Midland, Texas	Standard	2020-01-03	Valid
N4083A	Beech V35B	Fixed-wing, single engine	4083A LLC Wilmington, Delaware	Standard	2020-01-03	Valid
N7327V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Arkansas	None on file	2020-01-03	Valid
N95KM	Beech 58	Fixed-wing, multi-engine	Aerial Logistics LLC Trustee Lakeland, Florida	Standard	2020-01-03	Valid
N812WP	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2020-01-02	Valid
N2674X	Cessna P206A	Fixed-wing, single engine	Individual owner Indiana	Standard	2019-12-31	Valid
N28134	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Ohio	Standard	2019-12-31	Valid
N3014W	Beech E-55	Fixed-wing, multi-engine	Individual owner Illinois	Standard	2019-12-31	Valid
N6319U	Beech A36	Fixed-wing, single engine	Co-owned owner California	Standard	2019-12-30	Valid
N3888Y	Cessna 210D	Fixed-wing, single engine	Individual owner California	Standard	2019-12-27	Valid
N6613N	Cessna A185F	Fixed-wing, single engine	Barreto Manufacturing INC La Grande, Oregon	Standard	2019-12-27	Valid
N29359	Cessna 210L	Fixed-wing, single engine	Individual owner California	Standard	2019-12-23	Valid
N351VB	Beech V35B	Fixed-wing, single engine	Co-owned owner Illinois	Standard	2019-12-20	Valid
N1632W	Beech V35B	Fixed-wing, single engine	Cdg Aviation LLC Cresson, Texas	Standard	2019-12-19	Valid
N200DS	Bellanca 17-30A	Fixed-wing, single engine	Individual owner California	Standard	2019-12-19	Valid
N35S	Beech S35	Fixed-wing, single engine	Co-owned owner Washington	Standard	2019-12-19	Valid
N37MK	Beech V35B	Fixed-wing, single engine	Skyhoundmedia INC Royal Oak, Michigan	Standard	2019-12-19	Valid
N889JS	Beech V35B	Fixed-wing, single engine	Moran Consulting CORP Long Beach, California	Standard	2019-12-19	Valid
N321N	Beech D55	Fixed-wing, multi-engine	Individual owner Colorado	Standard	2019-12-18	Valid
N9343Q	Beech V35B	Fixed-wing, single engine	Individual owner Georgia	Standard	2019-12-18	Valid
N943AH	Cessna 210	Fixed-wing, single engine	Individual owner New York	Standard	2019-12-18	Valid
N3748Q	Beech V35	Fixed-wing, single engine	Individual owner Missouri	Standard	2019-12-17	Valid
N4468W	Beech V35B	Fixed-wing, single engine	Individual owner Kansas	Standard	2019-12-17	Valid
N5610S	Beech V35	Fixed-wing, single engine	Co-owned owner Florida	Standard	2019-12-16	Valid
N61471	Cessna A185F	Fixed-wing, single engine	N484Rf LLC Jackman, Maine	Standard	2019-12-13	Valid
N767B	Beech A35	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2019-12-13	Valid
N8FJ	Beech A36	Fixed-wing, single engine	Cheap Thrills I LLC Salida, Colorado	Standard	2019-12-13	Valid
N1174T	Beech E-55	Fixed-wing, multi-engine	Dynamic Erp Resources INC Mansfield, Texas	Standard	2019-12-12	Valid
N3207L	Beech A36	Fixed-wing, single engine	Rdl Construction INC Hollister, California	Standard	2019-12-12	Valid
N17814	Beech V35B	Fixed-wing, single engine	Co-owned owner Indiana	Standard	2019-12-10	Valid
N3447L	Cessna TU206B	Fixed-wing, single engine	Co-owned owner California	Standard	2019-12-10	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