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
N9573Z	Cessna U206G	Fixed-wing, single engine	Individual owner Washington	Standard	2012-11-30	Valid
N761AK	Cessna 210M	Fixed-wing, single engine	Hub Properties LTD Wilmington, Delaware	Standard	2012-11-29	Valid
N133CW	Cessna 310R	Fixed-wing, multi-engine	Deniro CORP Hampton, New Hampshire	Standard	2012-11-28	Valid
N88B	Beech A36	Fixed-wing, single engine	Air Taco LLC Virginia Beach, Virginia	Standard	2012-11-28	Valid
N9875V	Cessna A188	Fixed-wing, single engine	Satanta Flying Service INC Satanta, Kansas	Multiple	2012-11-28	Valid
N9632E	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Maryland	Standard	2012-11-27	Valid
N3KX	Cessna 414	Fixed-wing, multi-engine	Marathon California Holdings LP San Diego, California	Standard	2012-11-21	Valid
N61105	Cessna U206F	Fixed-wing, single engine	Co-owned owner Oregon	Standard	2012-11-21	Valid
N9617Z	Cessna U206G	Fixed-wing, single engine	Individual owner Alaska	Standard	2012-11-16	Valid
N26CU	Cessna U206G	Fixed-wing, single engine	Co-owned owner California	Standard	2012-11-13	Valid
N377D	Beech A36	Fixed-wing, single engine	Shawn Wyatt Enterprises INC Huntsville, Texas	Standard	2012-11-09	Valid
N4744V	Bellanca 17-30	Fixed-wing, single engine	Co-owned owner Kansas	Standard	2012-11-08	Valid
N4574M	Beech V35B	Fixed-wing, single engine	Individual owner Michigan	Standard	2012-11-07	Valid
N777CF	Cessna 210M	Fixed-wing, single engine	Cp Aviation LLC Pasco, Washington	Standard	2012-11-06	Valid
N87454	Cessna 310R	Fixed-wing, multi-engine	Individual owner North Carolina	Standard	2012-11-06	Valid
N8986M	Beech S35	Fixed-wing, single engine	170Kts LLC Novato, California	Standard	2012-11-05	Valid
N185BL	Cessna A185F	Fixed-wing, single engine	Individual owner Illinois	Standard	2012-11-01	Valid
N18DA	Cessna A185F	Fixed-wing, single engine	Co-owned owner Arizona	Standard	2012-11-01	Valid
N6669B	Cessna 210M	Fixed-wing, single engine	Constantia Group LLC Green Cove Springs, Florida	Standard	2012-11-01	Valid
N4803P	Beech 35-C33A	Fixed-wing, single engine	Kcn Aero Club INC Overland Park, Kansas	Standard	2012-10-31	Valid
N5WM	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2012-10-31	Valid
N7996M	Beech 35-C33A	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2012-10-31	Valid
N711FB	Cessna U206E	Fixed-wing, single engine	Individual owner Connecticut	Standard	2012-10-30	Valid
N185KA	Cessna A185F	Fixed-wing, single engine	Fischer Greg M Willow, Alaska	Standard	2012-10-29	Valid
N4721M	Beech F33A	Fixed-wing, single engine	Withheld at owner's request	Standard	2012-10-26	Valid
N50JM	Beech V35B	Fixed-wing, single engine	Individual owner Missouri	Standard	2012-10-26	Valid
N552BB	Beech E-55	Fixed-wing, multi-engine	Individual owner Arizona	Standard	2012-10-22	Valid
N98920	Cessna 310R	Fixed-wing, multi-engine	84Wc INC Lewes, Delaware	Standard	2012-10-22	Valid
N7163N	Beech V35A	Fixed-wing, single engine	Individual owner Michigan	Standard	2012-10-17	Valid
N664JG	Beech F33A	Fixed-wing, single engine	Specialty Contractors INC Lake In the Hills, Illinois	Standard	2012-10-16	Valid
N433S	Beech V35	Fixed-wing, single engine	Individual owner New York	Standard	2012-10-15	Valid
N898JB	Beech A36	Fixed-wing, single engine	Salesapproach INC Marlborough, Massachusetts	Standard	2012-10-12	Valid
N28081	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Washington	Standard	2012-10-05	Valid
N317BD	Beech 95-C55	Fixed-wing, multi-engine	Withheld at owner's request	Standard	2012-10-04	Valid
N4988	Cessna P210N	Fixed-wing, single engine	Co-owned owner	Standard	2012-10-03	Valid
N77LB	Beech 58	Fixed-wing, multi-engine	Eleuthera II LLC Mesa, Arizona	Standard	2012-10-02	Valid
N17660	Beech 58	Fixed-wing, multi-engine	Individual owner Arkansas	Standard	2012-10-01	Valid
N28168	Bellanca 17-30A	Fixed-wing, single engine	Walker Investment CO Construction Cookeville, Tennessee	Standard	2012-10-01	Valid
N3728Y	Cessna 210D	Fixed-wing, single engine	Prt Aviation CORP Wilmington, Delaware	Standard	2012-10-01	Valid
N703JM	Beech A36	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2012-10-01	Valid
N1752W	Beech A36	Fixed-wing, single engine	Michael S Austin Dmd Ms Psc Utica, Kentucky	Standard	2012-09-28	Valid
N514BK	Beech A36	Fixed-wing, single engine	Not for Naught LLC Wimberley, Texas	Standard	2012-09-27	Valid
N69670	Cessna 310R	Fixed-wing, multi-engine	Rose Aircraft Services INC Mena, Arkansas	Standard	2012-09-27	Valid
N5805K	Beech S35	Fixed-wing, single engine	Individual owner Kansas	Standard	2012-09-26	Valid
N9594Q	Beech 95-C55	Fixed-wing, multi-engine	Jhb Leasing LLC Madison, Minnesota	Standard	2012-09-26	Valid
N5624K	Beech S35	Fixed-wing, single engine	Individual owner Maryland	Standard	2012-09-25	Valid
N5828F	Cessna 210G	Fixed-wing, single engine	Individual owner Ohio	Standard	2012-09-25	Valid
N6170F	Cessna 210J	Fixed-wing, single engine	Individual owner Iowa	Standard	2012-09-20	Valid
N3876V	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2012-09-17	Valid
N5017U	Cessna 206	Fixed-wing, single engine	Ben Allen LLC Wilmington, Delaware	Standard	2012-09-17	Valid
N72299	Beech F33A	Fixed-wing, single engine	Johnson James C Marion, Kentucky	Standard	2012-09-17	Valid
N22QW	Beech S35	Fixed-wing, single engine	Caiati Ulysses H Fresno, California	Standard	2012-09-14	Valid
N1595L	Beech V35B	Fixed-wing, single engine	Individual owner Kansas	Standard	2012-09-13	Valid
N19RE	Beech F33A	Fixed-wing, single engine	Individual owner California	Special flight permit	2012-09-13	Valid
N2793T	Beech V35	Fixed-wing, single engine	Individual owner California	Standard	2012-09-13	Valid
N707AJ	Beech A36	Fixed-wing, single engine	Randy Goering INC Bend, Oregon	Standard	2012-09-13	Valid
N3684A	Beech F33A	Fixed-wing, single engine	Withheld at owner's request	Standard	2012-09-11	Valid
N4375P	Piper PA-46-310P	Fixed-wing, single engine	Individual owner Wyoming	Standard	2012-09-10	Valid
N3052X	Beech F33A	Fixed-wing, single engine	Jc Flight INC Wilmington, Delaware	Standard	2012-09-07	Valid
N3627A	Beech V35B	Fixed-wing, single engine	Individual owner Georgia	Standard	2012-09-07	Valid
N2577Q	Cessna A185F	Fixed-wing, single engine	Individual owner South Dakota	Multiple	2012-09-06	Valid
N1RT	Beech 95-C55	Fixed-wing, multi-engine	Individual owner Texas	Standard	2012-09-05	Valid
N2731T	Beech V35	Fixed-wing, single engine	Focus LLC Missoula, Montana	Standard	2012-09-05	Valid
N22WS	Beech A36	Fixed-wing, single engine	Co-owned owner North Carolina	Standard	2012-09-04	Valid
N1749U	Cessna 207	Fixed-wing, single engine	Freshwater Adventures INC Dillingham, Alaska	Standard	2012-08-30	Valid
N4661C	Cessna A185F	Fixed-wing, single engine	Individual owner Washington	Multiple	2012-08-29	Valid
N80337	Cessna A185F	Fixed-wing, single engine	Withheld at owner's request	Standard	2012-08-29	Valid
N6681L	Beech 58	Fixed-wing, multi-engine	Rotary Industries INC Miami, Florida	Standard	2012-08-22	Valid
N124WN	Cessna U206F	Fixed-wing, single engine	Co-owned owner Montana	Standard	2012-08-21	Valid
N206SV	Cessna P206C	Fixed-wing, single engine	Individual owner Colorado	Standard	2012-08-21	Valid
N45AM	Cessna 210D	Fixed-wing, single engine	Individual owner Arkansas	Standard	2012-08-21	Valid
N9470Q	Beech V35B	Fixed-wing, single engine	Co-owned owner Oregon	Standard	2012-08-21	Valid
N6589M	Cessna 210M	Fixed-wing, single engine	Individual owner New York	Standard	2012-08-20	Valid
N115WD	Beech E-55	Fixed-wing, multi-engine	Individual owner Indiana	Standard	2012-08-15	Valid
N9030R	Cessna A185E	Fixed-wing, single engine	Williams Transportation LLC St Paul, Minnesota	Standard	2012-08-15	Valid
N331JT	Cessna A185E	Fixed-wing, single engine	Juliet Tango Flying Services LLC Walnut Creek, California	Standard	2012-08-14	Valid
N35JT	Beech 36	Fixed-wing, single engine	Beech 36 LLC Siloam Springs, Arkansas	Standard	2012-08-13	Valid
N433D	Beech V35	Fixed-wing, single engine	Individual owner Louisiana	Standard	2012-08-09	Valid
N828TA	Cessna A185F	Fixed-wing, single engine	Travelaire Service INC Wilmington, Delaware	Standard	2012-08-09	Valid
N5704V	Beech V35	Fixed-wing, single engine	Ron Eldridge Properties LLC Nicholasville, Kentucky	Standard	2012-08-08	Valid
N8015Z	Cessna U206	Fixed-wing, single engine	Individual owner Alaska	Standard	2012-08-07	Valid
N9983R	Cessna U206G	Fixed-wing, single engine	Co-owned owner New York	Standard	2012-08-07	Valid
N4464W	Beech A36	Fixed-wing, single engine	Mantei & Associates LTD Lexington, South Carolina	Standard	2012-08-06	Valid
N6358S	Cessna U206G	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2012-08-06	Valid
N2131F	Cessna U206	Fixed-wing, single engine	Individual owner Alaska	Standard	2012-07-31	Valid
N5200X	Cessna U206G	Fixed-wing, single engine	Rwr Air INC Tok, Alaska	Standard	2012-07-31	Valid
N7104N	Beech V35A	Fixed-wing, single engine	Individual owner New Mexico	Standard	2012-07-31	Valid
N749KP	Cessna U206G	Fixed-wing, single engine	Kalinin Partners LLC Juneau, Alaska	Standard	2012-07-31	Valid
N70TB	Beech A36	Fixed-wing, single engine	Individual owner Iowa	Standard	2012-07-30	Valid
N1576W	Beech V35B	Fixed-wing, single engine	Individual owner Missouri	Standard	2012-07-26	Valid
N509JM	Beech V35B	Fixed-wing, single engine		Standard	2012-07-26	Valid
N4137B	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Texas	Standard	2012-07-25	Valid
N446T	Beech V35B	Fixed-wing, single engine	Individual owner California	Standard	2012-07-25	Valid
N73VB	Beech V35B	Fixed-wing, single engine	Vb Aviation LLC Mount Pleasant, South Carolina	Standard	2012-07-24	Valid
N4743Q	Cessna A185E	Fixed-wing, single engine	Individual owner Washington	Restricted	2012-07-17	Valid
N353EE	Cessna A185F	Fixed-wing, single engine	Co-owned owner Idaho	Standard	2012-07-12	Valid
N45WW	Beech A36	Fixed-wing, single engine	Individual owner California	Standard	2012-07-12	Valid
N9DN	Beech V35B	Fixed-wing, single engine	Maxs Airplane LLC Plano, Texas	Standard	2012-07-12	Valid
N4638F	Cessna P206A	Fixed-wing, single engine	Skydive Lake Tahoe LLC Tahoe City, California	Standard	2012-07-10	Valid
N774S	Beech V35	Fixed-wing, single engine	Dr Leasing LTD Wilmington, Delaware	Standard	2012-07-03	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