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
N334WS	Beech 35-C33A	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2018-01-29	Valid
N6467X	Beech A36	Fixed-wing, single engine	Scottfree Aviation LLC West Palm Beach, Florida	Standard	2018-01-29	Valid
N7987K	Beech S35	Fixed-wing, single engine	Sharair LLC Thomasville, Georgia	Standard	2018-01-29	Valid
N8RF	Beech F33A	Fixed-wing, single engine	Neumann-Wheatley Farms INC Isabel, Kansas	Standard	2018-01-29	Valid
N6652D	Beech V35B	Fixed-wing, single engine	Rafter B Cattle Company LLC Gordonville, Texas	Standard	2018-01-26	Valid
N5738V	Beech V35	Fixed-wing, single engine	Individual owner Arkansas	Standard	2018-01-25	Valid
N721SG	Cessna 206	Fixed-wing, single engine	Alaska Air Service LLC Brookings, Oregon	Standard	2018-01-25	Valid
N7758R	Beech 36	Fixed-wing, single engine	T & C Aviation LLC Ardmore, Oklahoma	Standard	2018-01-25	Valid
N32NB	Beech F33A	Fixed-wing, single engine	Individual owner Arizona	Standard	2018-01-24	Valid
N700K	Beech 58	Fixed-wing, multi-engine	Individual owner California	Standard	2018-01-24	Valid
N5HC	Beech V35B	Fixed-wing, single engine	Put A Lid On It Palm Beach INC Jupiter, Florida	Standard	2018-01-23	Valid
N77JB	Beech D55	Fixed-wing, multi-engine	Individual owner California	Standard	2018-01-23	Valid
N917MP	Beech 58	Fixed-wing, multi-engine	Pool Shark Equipment LLC Memphis, Tennessee	Standard	2018-01-23	Valid
N18EW	Beech 35-C33A	Fixed-wing, single engine	Co-owned owner New York	Standard	2018-01-17	Valid
N4084S	Beech V35B	Fixed-wing, single engine	Individual owner Illinois	Standard	2018-01-17	Valid
N52PA	Cessna 310R	Fixed-wing, multi-engine	Octagon CORP Lewes, Delaware	Standard	2018-01-17	Valid
N2992T	Aero Commander 200D	Fixed-wing, single engine	Meyers 200 LLC Malden, Missouri	Standard	2018-01-16	Valid
N36LF	Beech A36	Fixed-wing, single engine	Bonacia Aviation LLC Reno, Nevada	Standard	2018-01-16	Valid
N714MX	Cessna A185F	Fixed-wing, single engine	Individual owner Georgia	Standard	2018-01-16	Valid
N18367	Beech A36	Fixed-wing, single engine	Benoit Farms LLC Centralia, Missouri	Standard	2018-01-12	Valid
N31KG	Cessna 310R	Fixed-wing, multi-engine	Midwest Corporate Air INC Bellefontaine, Ohio	Standard	2018-01-12	Valid
N3373L	Cessna A185E	Fixed-wing, single engine	Individual owner Colorado	Multiple	2018-01-12	Valid
N8476N	Beech E33A	Fixed-wing, single engine	Individual owner Iowa	Standard	2018-01-12	Valid
N9479S	Beech 35-C33A	Fixed-wing, single engine	Individual owner California	Standard	2018-01-12	Valid
N1624H	Cessna A185F	Fixed-wing, single engine	Synergy Aviation LLC Forest Lake, Minnesota	Standard	2018-01-10	Valid
N8776Q	Cessna A185F	Fixed-wing, single engine	Co-owned owner Washington	Standard	2018-01-10	Valid
N9102Q	Beech V35B	Fixed-wing, single engine	Individual owner Florida	Standard	2018-01-10	Valid
N1074F	Cessna A185F	Fixed-wing, single engine	North River Air LLC Fairbanks, Alaska	Standard	2018-01-09	Valid
N1780R	Cessna A185F	Fixed-wing, single engine	Individual owner Ohio	Multiple	2018-01-09	Valid
N105KA	Cessna 401	Fixed-wing, multi-engine	Individual owner South Carolina	Standard	2018-01-08	Valid
N200JF	Beech F33A	Fixed-wing, single engine	Co-owned owner Oregon	Standard	2018-01-08	Valid
N2031B	Beech A36	Fixed-wing, single engine	Individual owner Virginia	Standard	2018-01-08	Valid
N4930N	Cessna 210M	Fixed-wing, single engine	Oneill Aviation LLC Lake Wales, Florida	Standard	2018-01-08	Valid
N516W	Beech V35B	Fixed-wing, single engine	Clearwater Holding LLC Parkersburg, West Virginia	Standard	2018-01-08	Valid
N7711D	Cessna U206F	Fixed-wing, single engine	Individual owner Alaska	Standard	2018-01-08	Valid
N33MK	Beech F33A	Fixed-wing, single engine	Individual owner New Jersey	Standard	2018-01-05	Valid
N7769R	Beech V35A	Fixed-wing, single engine	Pelican Air INC Kersey, Pennsylvania	Standard	2018-01-05	Valid
N732EZ	Cessna 210L	Fixed-wing, single engine	Butler Aviation LLP Smyrna, Tennessee	Standard	2018-01-04	Valid
N4520F	Cessna A185E	Fixed-wing, single engine	Withheld at owner's request	Standard	2018-01-03	Valid
N2289B	Beech 35-C33A	Fixed-wing, single engine	Hollister Jet Center INC Hollister, California	Standard	2018-01-02	Valid
N5410U	Beech V35	Fixed-wing, single engine	N5410U LLC West Babylon, New York	Standard	2018-01-02	Valid
N69CJ	Beech 36	Fixed-wing, single engine	Co-owned owner Idaho	Standard	2018-01-02	Valid
N82BF	Beech A36	Fixed-wing, single engine	Individual owner Mississippi	Standard	2018-01-02	Valid
N3418G	Cessna 310R	Fixed-wing, multi-engine	Individual owner Kansas	Standard	2017-12-28	Valid
N8130G	Cessna A188B	Fixed-wing, single engine	Bank of Utah Trustee Salt Lake City, Utah	Restricted	2017-12-28	Valid
N11185	Cessna A185F	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2017-12-27	Valid
N5908F	Cessna 210G	Fixed-wing, single engine	Charger Aviation LLC Chariton, Iowa	Standard	2017-12-27	Valid
N185WY	Cessna A185E	Fixed-wing, single engine	Individual owner Washington	Standard	2017-12-26	Valid
N7594H	Beech V35A	Fixed-wing, single engine	Vtanza LLC Indianapolis, Indiana	Standard	2017-12-22	Valid
N9135S	Beech V35B	Fixed-wing, single engine	Co-owned owner Illinois	Standard	2017-12-22	Valid
N28039	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Minnesota	Standard	2017-12-21	Valid
N36WE	Beech A36	Fixed-wing, single engine	Major Holdings LLC Lewes, Delaware	Standard	2017-12-21	Valid
N6069S	Beech V35B	Fixed-wing, single engine	Co-owned owner Texas	Standard	2017-12-21	Valid
N75SS	Beech S35	Fixed-wing, single engine	Individual owner Arizona	Standard	2017-12-20	Valid
N6AY	Beech V35	Fixed-wing, single engine	Twin Cities Aviation INC Yuba City, California	Standard	2017-12-19	Valid
N7340V	Bellanca 17-30	Fixed-wing, single engine	Runnin Rabbit LLC Kalispell, Montana	Standard	2017-12-19	Valid
N109ML	Beech A36	Fixed-wing, single engine	Jerry Luttrell and Associates INC Kearney, Missouri	Standard	2017-12-15	Valid
N6184Q	Cessna 320F	Fixed-wing, multi-engine	Marc INC Bolton, Mississippi	Standard	2017-12-14	Valid
N4933Q	Cessna A188B	Fixed-wing, single engine	Individual owner Missouri	Restricted	2017-12-13	Valid
N89LR	Beech A36	Fixed-wing, single engine	A36 Gps LLC Boone, North Carolina	Standard	2017-12-13	Valid
N1644M	Cessna A185E	Fixed-wing, single engine	Individual owner Minnesota	Standard	2017-12-08	Valid
N8253M	Cessna 210K	Fixed-wing, single engine	Hudak Organization LLC Cedar Grove, New Jersey	Standard	2017-12-08	Valid
N18334	Beech F33A	Fixed-wing, single engine	Jones Marine INC Salisbury, North Carolina	Standard	2017-12-07	Valid
N5610K	Beech S35	Fixed-wing, single engine	Individual owner Alabama	Standard	2017-12-07	Valid
N6218X	Beech F33A	Fixed-wing, single engine	Flying Ace Services LLC Willow Park, Texas	Standard	2017-12-07	Valid
N8123Q	Cessna U206F	Fixed-wing, single engine	8123Q LLC Olympia, Washington	Standard	2017-12-07	Valid
N14690	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Texas	Standard	2017-12-06	Valid
N69PR	Cessna T210H	Fixed-wing, single engine	Aero Inventory LLC Monroe, Georgia	Standard	2017-12-06	Valid
N35TE	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2017-12-05	Valid
N4904U	Cessna 210E	Fixed-wing, single engine	Individual owner Texas	Standard	2017-12-05	Valid
N611RS	Beech A36	Fixed-wing, single engine	Co-owned owner California	Standard	2017-12-05	Valid
N8259L	Beech F33A	Fixed-wing, single engine	Friendly Air LLC Tampa, Florida	Standard	2017-12-01	Valid
N68RD	Cessna 320D	Fixed-wing, multi-engine	Individual owner California	Multiple	2017-11-30	Valid
N9154Q	Beech F33A	Fixed-wing, single engine	Buck Air LLC Dover, Delaware	Standard	2017-11-30	Valid
N1795R	Cessna A185F	Fixed-wing, single engine	Co-owned owner Louisiana	Standard	2017-11-29	Valid
N3111H	Beech F33A	Fixed-wing, single engine	Individual owner Oregon	Standard	2017-11-29	Valid
N8210R	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Minnesota	Standard	2017-11-29	Valid
N110BD	Cessna 210N	Fixed-wing, single engine	Individual owner New Jersey	Standard	2017-11-28	Valid
N1450B	Beech A36	Fixed-wing, single engine	Berry Boger Yacht Sales INC North Myrtle Beach, South Carolina	Standard	2017-11-28	Valid
N18344	Beech E-55	Fixed-wing, multi-engine	Ab Aviation Sales & Rental LLC Washington, District of Columbia	Standard	2017-11-28	Valid
N367HP	Beech A36	Fixed-wing, single engine	N367Hp LLC Aberdeen, South Dakota	Standard	2017-11-28	Valid
N4869J	Beech 95-C55	Fixed-wing, multi-engine	Dls Aviation LLC Gilmer, Texas	Standard	2017-11-28	Valid
N7977M	Beech V35	Fixed-wing, single engine	Individual owner Texas	Standard	2017-11-28	Valid
N2746T	Beech V35	Fixed-wing, single engine	Individual owner Nevada	Standard	2017-11-27	Valid
N4533S	Beech F33A	Fixed-wing, single engine	Co-owned owner New Jersey	Standard	2017-11-27	Valid
N61EC	Cessna A185F	Fixed-wing, single engine	Bald Mountain LLC Dedham, Maine	Standard	2017-11-27	Valid
N176LF	Beech A36	Fixed-wing, single engine	Four Basics LLC Olathe, Kansas	Standard	2017-11-22	Valid
N6309Y	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	2017-11-22	Valid
N9518G	Cessna U206F	Fixed-wing, single engine	Individual owner Oregon	Standard	2017-11-22	Valid
N185DB	Cessna A185F	Fixed-wing, single engine	Talarik Air LLC King Salmon, Alaska	Standard	2017-11-20	Valid
N185GE	Cessna A185F	Fixed-wing, single engine	Co-owned owner California	Standard	2017-11-20	Valid
N124DP	Cessna 310R	Fixed-wing, multi-engine	Baja Air LLC Wilmington, Delaware	Standard	2017-11-17	Valid
N5647G	Cessna 188B	Fixed-wing, single engine	Individual owner Missouri	Restricted	2017-11-17	Valid
N9036M	Cessna 210M	Fixed-wing, single engine	Chalk 2 INC Apple Valley, California	Standard	2017-11-16	Valid
N1658U	Cessna 207	Fixed-wing, single engine	Individual owner Alaska	Standard	2017-11-15	Valid
N1750U	Cessna 207	Fixed-wing, single engine	Individual owner Alaska	Standard	2017-11-15	Valid
N2FK	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	2017-11-15	Valid
N26DL	Cessna A185F	Fixed-wing, single engine	Co-owned owner Missouri	Standard	2017-11-13	Valid
N3695N	Beech 58	Fixed-wing, multi-engine	Individual owner Florida	Standard	2017-11-13	Valid
N731VY	Cessna A188B	Fixed-wing, single engine	Individual owner Nebraska	Restricted	2017-11-13	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