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
N4435V	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2017-01-03	Valid
N623AM	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Texas	Standard	2017-01-03	Valid
N9304Q	Beech V35B	Fixed-wing, single engine	K Factor Aircraft CORP Jupiter, Florida	Standard	2017-01-03	Valid
N2133W	Beech F33A	Fixed-wing, single engine	Co-owned owner California	Standard	2016-12-27	Valid
N511DC	Cessna TU206A	Fixed-wing, single engine	Jago River Holdings LLC Fairbanks, Alaska	Standard	2016-12-27	Valid
N2252R	Cessna T210J	Fixed-wing, single engine	Individual owner Arizona	Standard	2016-12-22	Valid
N2311F	Cessna 210E	Fixed-wing, single engine	Co-owned owner California	Standard	2016-12-22	Valid
N8693Q	Beech S35	Fixed-wing, single engine	Co-owned owner Missouri	Standard	2016-12-21	Valid
N185WM	Cessna A185E	Fixed-wing, single engine	Withrotor Aviation INC Lakeview, Oregon	Multiple	2016-12-19	Valid
N1970N	Beech A36	Fixed-wing, single engine	Co-owned owner Montana	Standard	2016-12-19	Valid
N713TT	Beech V35B	Fixed-wing, single engine	Abe Air LLC Salinas, California	Standard	2016-12-15	Valid
N185SL	Cessna A185F	Fixed-wing, single engine	Department of Inland Fisheries and Wildlife Augusta, Maine	Standard	2016-12-14	Valid
N4621Q	Cessna 210L	Fixed-wing, single engine	Individual owner Illinois	Standard	2016-12-14	Valid
N23551	Beech A36	Fixed-wing, single engine	S&M Aviation (A CO Limited Liability CO) Colorado Springs, Colorado	Standard	2016-12-13	Valid
N25RD	Beech F33A	Fixed-wing, single engine	Co-owned owner Washington	Standard	2016-12-13	Valid
N6642D	Beech E-55	Fixed-wing, multi-engine	Individual owner Oregon	Standard	2016-12-13	Valid
N2608X	Cessna P206	Fixed-wing, single engine	Individual owner New York	Standard	2016-12-12	Valid
N421SW	Beech E33A	Fixed-wing, single engine	Individual owner California	Standard	2016-12-12	Valid
N40G	Beech V35B	Fixed-wing, single engine	Hagerty Environmental LLC Kennett Square, Pennsylvania	Standard	2016-12-09	Valid
N7243E	Beech A36	Fixed-wing, single engine	Individual owner Idaho	Standard	2016-12-09	Valid
N4172S	Beech F33A	Fixed-wing, single engine	Wharton Roofing Services LLC Gulf Breeze, Florida	Standard	2016-12-08	Valid
N6112V	Beech S35	Fixed-wing, single engine	Individual owner New York	Standard	2016-12-07	Valid
N72313	Cessna U206D	Fixed-wing, single engine	Alaskan Air Charter LLC Anchorage, Alaska	Multiple	2016-12-07	Valid
N7380H	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2016-12-07	Valid
N15TB	Cessna 210N	Fixed-wing, single engine	East West Helicopter INC Batesville, Indiana	Standard	2016-12-06	Valid
N3383S	Cessna 210J	Fixed-wing, single engine	Individual owner Nevada	Standard	2016-12-06	Valid
N4967F	Cessna TU206B	Fixed-wing, single engine	Mile Hi Skydivers INC Longmont, Colorado	Standard	2016-12-06	Valid
N249MV	Beech F33A	Fixed-wing, single engine	Individual owner Montana	Experimental	2016-12-05	Valid
N3959Y	Cessna 210D	Fixed-wing, single engine	Individual owner California	Standard	2016-11-30	Valid
N17826	Beech A36	Fixed-wing, single engine	Three Six Bonita LLC Georgetown, Texas	Standard	2016-11-29	Valid
N266BN	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Florida	Standard	2016-11-29	Valid
N350TM	Cessna 210J	Fixed-wing, single engine	Individual owner Oregon	Standard	2016-11-29	Valid
N1920Q	Cessna A185F	Fixed-wing, single engine	Acadian Aircraft Leasing LLC Rangeley, Maine	Standard	2016-11-28	Valid
N866DL	Bellanca 17-30A	Fixed-wing, single engine	Co-owned owner Idaho	Standard	2016-11-28	Valid
N9093Q	Beech A36	Fixed-wing, single engine	Investa Aviation LLC Yoakum, Texas	Standard	2016-11-28	Valid
N206TT	Cessna U206G	Fixed-wing, single engine	Individual owner Alaska	Standard	2016-11-23	Valid
N28CP	Beech V35B	Fixed-wing, single engine	Ark Investments INC Ridgeland, Mississippi	Standard	2016-11-23	Valid
N777CE	Beech V35B	Fixed-wing, single engine	Individual owner California	Standard	2016-11-23	Valid
N98834	Cessna 310R	Fixed-wing, multi-engine	Individual owner New Jersey	Standard	2016-11-23	Valid
N12AW	Cessna U206G	Fixed-wing, single engine	Tgam LLC Toppenish, Washington	Standard	2016-11-22	Valid
N30RF	Beech F33C	Fixed-wing, single engine	Individual owner Texas	Standard	2016-11-22	Valid
N9296Q	Beech V35B	Fixed-wing, single engine	Reichert Aviation Enterprises LLC El Cajon, California	Standard	2016-11-17	Valid
N9992Z	Cessna U206G	Fixed-wing, single engine	Advanced Placement Aviation LLC Eagle River, Alaska	Standard	2016-11-17	Valid
N8854V	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Tennessee	Standard	2016-11-16	Valid
N1833L	Beech F33A	Fixed-wing, single engine	Scrap Metal LLC Mountainside, New Jersey	Standard	2016-11-15	Valid
N3160W	Beech A36	Fixed-wing, single engine	Palmetto Wings LLC Longs, South Carolina	Standard	2016-11-15	Valid
N17797	Beech V35B	Fixed-wing, single engine	Individual owner California	Standard	2016-11-14	Valid
N6979B	Cessna 210M	Fixed-wing, single engine	Centurion Bravo LLC Houston, Texas	Standard	2016-11-14	Valid
N756BN	Cessna U206G	Fixed-wing, single engine	Beck Skydiving & Rigging LLC Bixby, Oklahoma	Standard	2016-11-14	Valid
N88AN	Beech F33A	Fixed-wing, single engine	Jk Manufacturing CO Wilmington, Delaware	Standard	2016-11-14	Valid
N3147W	Beech V35B	Fixed-wing, single engine	Tadesco Rothchild LLC Wilmington, Delaware	Standard	2016-11-10	Valid
N4729W	Cessna 210E	Fixed-wing, single engine	Michael J Kraynick Pllc Hailey, Idaho	Standard	2016-11-10	Valid
N621NM	Beech 58	Fixed-wing, multi-engine	Airmorgan Limited LLC Reno, Nevada	Standard	2016-11-10	Valid
N8115R	Beech V35A	Fixed-wing, single engine	Withheld at owner's request	Standard	2016-11-10	Valid
N9423S	Beech V35	Fixed-wing, single engine	Tlc Aero LLC Magnolia, Texas	Standard	2016-11-10	Valid
N6655Y	Beech A36	Fixed-wing, single engine	Bretts Spray Service INC Onida, South Dakota	Standard	2016-11-07	Valid
N525JB	Cessna A185F	Fixed-wing, single engine	Individual owner Texas	Standard	2016-11-04	Valid
N5668K	Beech S35	Fixed-wing, single engine	Individual owner Washington	Standard	2016-11-02	Valid
N8833A	Beech F33A	Fixed-wing, single engine	Individual owner Illinois	Standard	2016-11-02	Valid
N981Y	Beech V35	Fixed-wing, single engine	Individual owner Massachusetts	Standard	2016-11-02	Valid
N6605X	Beech F33A	Fixed-wing, single engine	Individual owner New York	Standard	2016-11-01	Valid
N859DL	Cessna A185F	Fixed-wing, single engine	Individual owner Texas	Standard	2016-11-01	Valid
N921KK	Beech E-55	Fixed-wing, multi-engine	Tat Networks and Aviation LLC Bend, Oregon	Standard	2016-11-01	Valid
N1215T	Beech 95-C55	Fixed-wing, multi-engine	Individual owner Nevada	Standard	2016-10-31	Valid
N4644C	Cessna A185F	Fixed-wing, single engine	Individual owner Wisconsin	Multiple	2016-10-27	Valid
N5173U	Cessna 206	Fixed-wing, single engine	Individual owner North Dakota	Standard	2016-10-27	Valid
N761JT	Beech 35-C33A	Fixed-wing, single engine	Individual owner Michigan	Standard	2016-10-27	Valid
N8079G	Cessna A188B	Fixed-wing, single engine	Individual owner Georgia	Restricted	2016-10-26	Valid
N94237	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2016-10-26	Valid
N756KP	Cessna U206G	Fixed-wing, single engine	Vne Holdings Group LLC North Canton, Ohio	Standard	2016-10-25	Valid
N777RR	Cessna 210M	Fixed-wing, single engine	Chalk 2 INC Apple Valley, California	Standard	2016-10-25	Valid
N7878R	Beech D55	Fixed-wing, multi-engine	Weishaar Traig Tl Worley, Idaho	Standard	2016-10-25	Valid
N789Z	Cessna A185F	Fixed-wing, single engine	Individual owner Tennessee	Standard	2016-10-25	Valid
N5198U	Cessna 206	Fixed-wing, single engine	Co-owned owner California	Standard	2016-10-24	Valid
N811GM	Cessna A185F	Fixed-wing, single engine	Individual owner Washington	Standard	2016-10-24	Valid
N10JV	Cessna A185F	Fixed-wing, single engine	Individual owner Massachusetts	Standard	2016-10-21	Valid
N1179T	Beech A36	Fixed-wing, single engine	Quad Rabbit INC Wilmington, Delaware	Standard	2016-10-21	Valid
N206PK	Cessna U206G	Fixed-wing, single engine	Cardinal Aviation LLC Gaines, Michigan	Standard	2016-10-21	Valid
N911V	Beech V35	Fixed-wing, single engine	Individual owner Minnesota	Standard	2016-10-21	Valid
N70333	Cessna A185F	Fixed-wing, single engine	Northland Aircraft Sales LLC Fairbanks, Alaska	Standard	2016-10-20	Valid
N210WM	Cessna 210D	Fixed-wing, single engine	Bryan-Kennedy LLC Tulsa, Oklahoma	Standard	2016-10-19	Valid
N6120V	Beech S35	Fixed-wing, single engine	Draw Holdings LLC Meridian, Texas	Standard	2016-10-19	Valid
N574MT	Cessna A185E	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2016-10-17	Valid
N70162	Cessna A185E	Fixed-wing, single engine	Nwops LLC Woodinville, Washington	Multiple	2016-10-17	Valid
N310TM	Cessna 310R	Fixed-wing, multi-engine	Individual owner Arizona	Standard	2016-10-13	Valid
N32331	Cessna T210N	Fixed-wing, single engine	Individual owner Nevada	Standard	2016-10-13	Valid
N3850Y	Cessna 210D	Fixed-wing, single engine	Individual owner Montana	Standard	2016-10-12	Valid
N5916F	Cessna 210G	Fixed-wing, single engine	Tlc Flying INC Colfax, Washington	Standard	2016-10-12	Valid
N6654R	Beech V35B	Fixed-wing, single engine	Low Mach Aero LLC Hays, Kansas	Standard	2016-10-12	Valid
N550YR	Beech E-55	Fixed-wing, multi-engine	Co-owned owner Virginia	Standard	2016-10-07	Valid
N6729Z	Beech 58	Fixed-wing, multi-engine	Middle Tennessee Aircraft Services LLC Mount Pleasant, Tennessee	Standard	2016-10-04	Valid
N260AA	Beech V35	Fixed-wing, single engine	Individual owner Arizona	Standard	2016-10-03	Valid
N828KA	Beech F33A	Fixed-wing, single engine	Individual owner Texas	Standard	2016-09-28	Valid
N185DR	Cessna A185F	Fixed-wing, single engine	Co-owned owner Nevada	Standard	2016-09-27	Valid
N567M	Beech F33A	Fixed-wing, single engine	Individual owner North Carolina	Standard	2016-09-27	Valid
N6050M	Beech A36	Fixed-wing, single engine	Agl Aviation and Management LLC Payson, Arizona	Standard	2016-09-27	Valid
N63BH	Beech A36	Fixed-wing, single engine	N63Bh LLC Auburn, Alabama	Standard	2016-09-27	Valid
N479JP	Beech A36	Fixed-wing, single engine	Individual owner Tennessee	Standard	2016-09-23	Valid
N5284U	Cessna U206	Fixed-wing, single engine	Cochrane Timothy A Chippewa Lake, Ohio	Standard	2016-09-22	Valid
N6KR	Beech 35-C33A	Fixed-wing, single engine	Co-owned owner Illinois	Standard	2016-09-22	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