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
N370JC	Cessna U206G	Fixed-wing, single engine	South Oaks INC Hollywood, Florida	Standard	2014-03-28	Valid
N3737K	Beech A36	Fixed-wing, single engine	Individual owner Illinois	Standard	2014-03-28	Valid
N2813A	Beech V35A	Fixed-wing, single engine	Co-owned owner Nebraska	Standard	2014-03-27	Valid
N756WR	Cessna U206G	Fixed-wing, single engine	Individual owner Alaska	Standard	2014-03-26	Valid
N10YD	Piper PA-23-250	Fixed-wing, multi-engine	Individual owner North Carolina	Standard	2014-03-25	Valid
N599WB	Beech F33A	Fixed-wing, single engine	7R Leasing LLC Wilmington, Delaware	Standard	2014-03-24	Valid
N8134R	Beech F33A	Fixed-wing, single engine	Folsom Airplane CO LLC Longwood, Florida	Standard	2014-03-24	Valid
N333WA	Beech 36	Fixed-wing, single engine	Individual owner Mississippi	Standard	2014-03-21	Valid
N4568S	Beech F33A	Fixed-wing, single engine	Yuma Desert Fliers LLC Yuma, Arizona	Standard	2014-03-21	Valid
N59146	Cessna U206F	Fixed-wing, single engine	Universal Charter Service INC Auburn, California	Standard	2014-03-20	Valid
N1696X	Cessna 210L	Fixed-wing, single engine	Centurion LLC New Bern, North Carolina	Standard	2014-03-18	Valid
N410HA	Beech A36	Fixed-wing, single engine	Individual owner Maryland	Standard	2014-03-18	Valid
N6026Y	Beech A36	Fixed-wing, single engine	Western Flying Club INC Burlington, North Carolina	Standard	2014-03-17	Valid
N335V	Beech V35B	Fixed-wing, single engine	Co-owned owner Iowa	Standard	2014-03-13	Valid
N667DB	Beech F33A	Fixed-wing, single engine	Individual owner Oregon	Standard	2014-03-13	Valid
N3804Y	Cessna 210D	Fixed-wing, single engine	Individual owner South Dakota	Standard	2014-03-11	Valid
N87MT	Beech F33A	Fixed-wing, single engine	Individual owner Texas	Standard	2014-03-11	Valid
N2667	Beech V35	Fixed-wing, single engine	Marlow Air LLC Gilmanton Iw, New Hampshire	Standard	2014-03-10	Valid
N511PM	Cessna 206	Fixed-wing, single engine	D & J Air Adventures INC Koloa, Hawaii	Standard	2014-03-10	Valid
N6745T	Beech F33A	Fixed-wing, single engine	Co-owned owner North Carolina	Standard	2014-03-07	Valid
N6KM	Beech T-34B	Fixed-wing, single engine	J Bird Enterprises LLC Miami Lakes, Florida	Standard	2014-03-06	Valid
N792Q	Beech D55	Fixed-wing, multi-engine	Individual owner North Carolina	Standard	2014-03-05	Valid
N88ES	Beech A36	Fixed-wing, single engine	Individual owner North Dakota	Standard	2014-03-05	Valid
N1856R	Cessna A185F	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2014-03-04	Valid
N789PD	Beech V35	Fixed-wing, single engine	Individual owner California	Standard	2014-03-04	Valid
N61SM	Beech A36	Fixed-wing, single engine	Sma Aero LLC Benton, Kansas	Standard	2014-03-03	Valid
N5706V	Beech V35	Fixed-wing, single engine	Individual owner Georgia	Standard	2014-02-27	Valid
N9759G	Cessna A188B	Fixed-wing, single engine	Individual owner Texas	Restricted	2014-02-27	Valid
N456T	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2014-02-26	Valid
N4176B	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Florida	Standard	2014-02-25	Valid
N159AA	Beech A36	Fixed-wing, single engine		Standard	2014-02-24	Valid
N208T	Beech A36	Fixed-wing, single engine	Mustang Sally LLC Bullhead City, Arizona	Standard	2014-02-24	Valid
N4761Q	Cessna A185E	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2014-02-24	Valid
N53GM	Beech V35A	Fixed-wing, single engine	Onawa Flying Service INC Sioux City, Iowa	Standard	2014-02-24	Valid
N6685R	Beech V35B	Fixed-wing, single engine	Global Distillation Services LLC Reno, Nevada	Standard	2014-02-24	Valid
N1854K	Beech A36	Fixed-wing, single engine	Nelson Law Firm PC Billings, Montana	Standard	2014-02-21	Valid
N4916F	Cessna U206A	Fixed-wing, single engine	Individual owner California	Standard	2014-02-21	Valid
N90TF	Cessna U206G	Fixed-wing, single engine	Monterey County Sheriffs Office Salinas, California	Standard	2014-02-21	Valid
N420ZB	Beech A36	Fixed-wing, single engine	Adaptive Aerospace CORP Tehachapi, California	Standard	2014-02-20	Valid
N6662H	Beech V35B	Fixed-wing, single engine	Co-owned owner California	Standard	2014-02-20	Valid
N709JD	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2014-02-19	Valid
N1322R	Cessna 185	Fixed-wing, single engine	Co-owned owner California	Standard	2014-02-13	Valid
N328HR	Beech V35B	Fixed-wing, single engine	Individual owner Virginia	Standard	2014-02-13	Valid
N4560M	Beech F33A	Fixed-wing, single engine	Co-owned owner Washington	Standard	2014-02-13	Valid
N70598	Cessna U206F	Fixed-wing, single engine	Individual owner Minnesota	Standard	2014-02-13	Valid
N7891L	Beech 35-C33A	Fixed-wing, single engine	Grr Aviation LLC Grand Rapids, Michigan	Standard	2014-02-13	Valid
N7539N	Cessna U206G	Fixed-wing, single engine	Individual owner Texas	Standard	2014-02-12	Valid
N3363Y	Cessna 210N	Fixed-wing, single engine	Camlik Air LLC Wausau, Wisconsin	Standard	2014-02-11	Valid
N833PM	Beech F33A	Fixed-wing, single engine	Lonely Luggage Delivery INC Arroyo Grande, California	Standard	2014-02-11	Valid
N358A	Beech V35B	Fixed-wing, single engine	Llewellyn Development LLC Charlotte, North Carolina	Standard	2014-02-10	Valid
N17718	Beech V35B	Fixed-wing, single engine	Co-owned owner California	Standard	2014-02-04	Valid
N3445L	Cessna U206B	Fixed-wing, single engine	Yama Air LLC Granite Bay, California	Standard	2014-02-03	Valid
N14738	Bellanca 17-30A	Fixed-wing, single engine	Co-owned owner Texas	Standard	2014-01-30	Valid
N2296L	Beech A36	Fixed-wing, single engine	Del Air INC Wilmington, Delaware	Standard	2014-01-30	Valid
N3859Y	Cessna 210D	Fixed-wing, single engine	Individual owner Idaho	Standard	2014-01-30	Valid
N1973	Beech E-55	Fixed-wing, multi-engine		Standard	2014-01-28	Valid
N3329V	Beech 35	Fixed-wing, single engine	Individual owner Kentucky	Standard	2014-01-27	Valid
N647JA	Wright T J/Anderson J P VELOCITY RG	Fixed-wing, single engine	Individual owner Colorado	Experimental	2014-01-24	Valid
N328S	Beech V35A	Fixed-wing, single engine	Fast Flight INC Springdale, Arkansas	Standard	2014-01-22	Valid
N82UC	Beech 58	Fixed-wing, multi-engine	Majesty Air INC Wilmington, Delaware	Standard	2014-01-17	Valid
N6712V	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2014-01-15	Valid
N7654N	Beech 36	Fixed-wing, single engine	E W Merritt Farms Porterville, California	Standard	2014-01-15	Valid
N111PF	Beech V35B	Fixed-wing, single engine	Individual owner Illinois	Standard	2014-01-14	Valid
N6222M	Beech V35	Fixed-wing, single engine	Beech Club LLC La Crosse, Indiana	Standard	2014-01-14	Valid
N8076Z	Cessna U206A	Fixed-wing, single engine	Individual owner Alaska	Standard	2014-01-14	Valid
N3056K	Beech F33A	Fixed-wing, single engine	Individual owner Georgia	Standard	2014-01-13	Valid
N185AD	Cessna A185F	Fixed-wing, single engine	Durrett Aviation LLC Anchorage, Alaska	Standard	2014-01-08	Valid
N30DM	Beech A36	Fixed-wing, single engine	Individual owner Michigan	Standard	2014-01-08	Valid
N4444T	Cessna P206A	Fixed-wing, single engine	Kinzie Industries LLC Alva, Oklahoma	Standard	2014-01-08	Valid
N3273M	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Standard	2014-01-06	Valid
N8287M	Cessna 210K	Fixed-wing, single engine	Co-owned owner Nebraska	Standard	2014-01-06	Valid
N828T	Beech A36	Fixed-wing, single engine	Individual owner Louisiana	Standard	2014-01-06	Valid
N58BS	Beech 58	Fixed-wing, multi-engine	Jordan Corporation Jackson, Michigan	Standard	2014-01-03	Valid
N93298	Cessna A185F	Fixed-wing, single engine	Co-owned owner Idaho	Standard	2014-01-03	Valid
N4004A	Beech V35B	Fixed-wing, single engine	Individual owner North Carolina	Standard	2014-01-02	Valid
N8695M	Beech S35	Fixed-wing, single engine	Ground Floor Design LLC Idyllwild, California	Standard	2014-01-02	Valid
N5053J	Cessna 310R	Fixed-wing, multi-engine	Clo CORP Wilmington, Delaware	Standard	2013-12-30	Valid
N5528V	Beech F33A	Fixed-wing, single engine	Co-owned owner Texas	Standard	2013-12-30	Valid
N8131Q	Cessna 414	Fixed-wing, multi-engine	Club Jet Investments LLC Wilmington, Delaware	Standard	2013-12-30	Valid
N18326	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2013-12-24	Valid
N197RD	Cessna A185F	Fixed-wing, single engine	Individual owner Colorado	Standard	2013-12-24	Valid
N70FF	Cessna A185F	Fixed-wing, single engine	Glassy Water LLC Portsmouth, New Hampshire	Standard	2013-12-24	Valid
N3765Y	Cessna 210D	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2013-12-23	Valid
N7301R	Miles Richard D Jr MILES-STARDUSTER TOO	Fixed-wing, single engine	Individual owner Georgia	Experimental	2013-12-23	Valid
N3139L	Beech F33A	Fixed-wing, single engine	On Premise LLC Hannibal, Missouri	Standard	2013-12-19	Valid
N833TD	Beech F33A	Fixed-wing, single engine	Tdu Investments LLC Lewiston, Idaho	Standard	2013-12-19	Valid
N40KG	Beech A36	Fixed-wing, single engine	Four Stars Aviation INC Mclean, Virginia	Standard	2013-12-18	Valid
N61556	Cessna A185F	Fixed-wing, single engine	Co-owned owner Idaho	Standard	2013-12-18	Valid
N6659G	Beech F33A	Fixed-wing, single engine	Individual owner Kansas	Standard	2013-12-18	Valid
N9815Z	Cessna U206G	Fixed-wing, single engine	Silver Creek Aviation Services Fort Worth, Texas	Standard	2013-12-18	Valid
N7488N	Beech 36	Fixed-wing, single engine	Individual owner Colorado	Standard	2013-12-11	Valid
N21958	Cessna A185F	Fixed-wing, single engine	Hillsboro Aero LTD Hillsboro, North Dakota	Standard	2013-12-10	Valid
N69YG	Beech F33A	Fixed-wing, single engine	Co-owned owner California	Standard	2013-12-10	Valid
N711TV	Beech S35	Fixed-wing, single engine	Repko Ventures LLC Logan, Utah	Standard	2013-12-09	Valid
N1050F	Cessna A185F	Fixed-wing, single engine	Individual owner Washington	Standard	2013-12-05	Valid
N1909L	Beech V35B	Fixed-wing, single engine	52 Foxtrot Aviation LLC Billings, Montana	Standard	2013-12-04	Valid
N616JH	Cessna A185F	Fixed-wing, single engine	Harcatco LLC Corsicana, Texas	Standard	2013-12-02	Valid
N17KR	Beech 95-C55	Fixed-wing, multi-engine	Individual owner California	Standard	2013-11-25	Valid
N5460U	Beech 35-C33A	Fixed-wing, single engine	Individual owner New York	Standard	2013-11-25	Valid
N733AC	Beech F33A	Fixed-wing, single engine	Individual owner Virginia	Standard	2013-11-25	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