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
N34FF	Cessna U206F	Fixed-wing, single engine	Individual owner Texas	Standard	2013-05-17	Valid
N8402N	Beech V35A	Fixed-wing, single engine	Co-owned owner Tennessee	Standard	2013-05-17	Valid
N2381F	Cessna 210E	Fixed-wing, single engine	Oops LLC Cheyenne, Wyoming	Standard	2013-05-15	Valid
N7153N	Beech D55	Fixed-wing, multi-engine	Individual owner Montana	Standard	2013-05-15	Valid
N813CH	Beech V35B	Fixed-wing, single engine	Individual owner Oregon	Standard	2013-05-14	Valid
N4852E	Cessna A185F	Fixed-wing, single engine	Individual owner Texas	Standard	2013-05-13	Valid
N6056Y	Beech V35B	Fixed-wing, single engine	Diesel Flying LLC Wilmington, Delaware	Standard	2013-05-13	Valid
N9610G	Cessna U206F	Fixed-wing, single engine	Choice Aviation LLC Hamilton, Montana	Standard	2013-05-09	Valid
N7567Q	Cessna U206G	Fixed-wing, single engine	Individual owner Alaska	Standard	2013-05-07	Valid
N8566R	Beech V35B	Fixed-wing, single engine	Southwest Fresh Potato LLC Hugoton, Kansas	Standard	2013-05-07	Valid
N4949E	Cessna A185F	Fixed-wing, single engine	Trans Crafts LLC Big Lake, Alaska	Standard	2013-05-06	Valid
N4332C	Cessna A188B	Fixed-wing, single engine	Individual owner Florida	Restricted	2013-05-02	Valid
N6266H	Cessna 207A	Fixed-wing, single engine	Novi INC Ruby, Alaska	Standard	2013-05-02	Valid
N6501Y	Cessna 210N	Fixed-wing, single engine	Lively Charters INC Summerland Key, Florida	Standard	2013-05-02	Valid
N8704Z	Cessna P206C	Fixed-wing, single engine	Individual owner Michigan	Standard	2013-05-02	Valid
N330WH	Beech F33A	Fixed-wing, single engine	2K Partners LLC Dallas, Texas	Standard	2013-05-01	Valid
N3078J	Cessna A188B	Fixed-wing, single engine	Robertson Crop Dusting Service INC South Haven, Michigan	Restricted	2013-04-25	Valid
N993T	Beech S35	Fixed-wing, single engine	Beyond Approach LLC Brighton, Colorado	Standard	2013-04-23	Valid
N841JL	Cessna T210H	Fixed-wing, single engine	Individual owner Colorado	Standard	2013-04-19	Valid
N185TW	Cessna A185F	Fixed-wing, single engine	United States Air Force Jber, Alaska	Standard	2013-04-18	Valid
N18X	Beech A36	Fixed-wing, single engine	Individual owner Illinois	Standard	2013-04-15	Valid
N2279R	Cessna T210J	Fixed-wing, single engine	Individual owner South Carolina	Standard	2013-04-15	Valid
N13HW	Cessna 185A	Fixed-wing, single engine	Individual owner Georgia	Standard	2013-04-12	Valid
N3954Y	Cessna 210D	Fixed-wing, single engine	Co-owned owner California	Standard	2013-04-12	Valid
N7014C	Beech F33A	Fixed-wing, single engine	Act Aviation LLC Oxford, Mississippi	Standard	2013-04-12	Valid
N6195X	Cessna 310R	Fixed-wing, multi-engine	Slc Service Leasing Company LLC Tipton, Iowa	Standard	2013-04-10	Valid
N8758Z	Cessna P206D	Fixed-wing, single engine	Individual owner Washington	Standard	2013-04-09	Valid
N18457	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2013-04-05	Valid
N2557X	Cessna P206	Fixed-wing, single engine	Individual owner Idaho	Standard	2013-04-04	Valid
N4108G	Beech 58	Fixed-wing, multi-engine	Individual owner Massachusetts	Standard	2013-04-04	Valid
N1731W	Beech A36	Fixed-wing, single engine	Collins Air LLC Kennett, Missouri	Standard	2013-04-03	Valid
N5602S	Beech V35	Fixed-wing, single engine	Withheld at owner's request	Standard	2013-04-03	Valid
N7318H	Cessna A185F	Fixed-wing, single engine	Co-owned owner Minnesota	Multiple	2013-04-02	Valid
N3174K	Beech F33A	Fixed-wing, single engine	Lrs Dynamics CORP Port Orange, Florida	Standard	2013-04-01	Valid
N52SB	Beech A36	Fixed-wing, single engine	Redwood Oil CO INC Rohnert Park, California	Standard	2013-04-01	Valid
N9057S	Cessna 210R	Fixed-wing, single engine	Medical Supply X LLC Coats, North Carolina	Standard	2013-03-29	Valid
N585MJ	Beech A36	Fixed-wing, single engine	Costanzo Aviation INC Bethany Beach, Delaware	Standard	2013-03-28	Valid
N14751	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Texas	Standard	2013-03-27	Valid
N6026U	Beech V35B	Fixed-wing, single engine	Co-owned owner California	Standard	2013-03-27	Valid
N89SG	Beech F33A	Fixed-wing, single engine	Individual owner Maine	Standard	2013-03-27	Valid
N4513M	Beech E-55	Fixed-wing, multi-engine	Leopold Aero LLC Wilmington, Delaware	Standard	2013-03-18	Valid
N9294H	Cessna A185F	Fixed-wing, single engine	Wet Dreams LLC Erwinna, Pennsylvania	Standard	2013-03-14	Valid
N100PR	Beech V35B	Fixed-wing, single engine	Co-owned owner Arizona	Standard	2013-03-13	Valid
N574JP	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2013-03-13	Valid
N9556J	Cessna A188B	Fixed-wing, single engine	S & D Spraying Service INC Panhandle, Texas	Standard	2013-03-12	Valid
N9452G	Cessna U206E	Fixed-wing, single engine	Individual owner Alaska	Standard	2013-03-11	Valid
N850MG	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Standard	2013-03-08	Valid
N8674Q	Beech S35	Fixed-wing, single engine	Individual owner Connecticut	Standard	2013-03-07	Valid
N3946Y	Cessna 210D	Fixed-wing, single engine	Individual owner Texas	Standard	2013-03-05	Valid
N206AR	Cessna U206G	Fixed-wing, single engine	Canoe Bay Outfitters LLC Port Alsworth, Alaska	Standard	2013-03-04	Valid
N4059S	Beech V35B	Fixed-wing, single engine	Kramer Harvesting LLC Johnson, Kansas	Standard	2013-03-04	Valid
N923AK	Beech A36	Fixed-wing, single engine	Co-owned owner Nevada	Standard	2013-03-01	Valid
N362T	Beech V35B	Fixed-wing, single engine	Individual owner Florida	Standard	2013-02-27	Valid
N14736	Bellanca 17-30A	Fixed-wing, single engine	Co-owned owner Texas	Standard	2013-02-20	Valid
N279SV	Bellanca 17-30A	Fixed-wing, single engine	George W Goodknight INC Chattanooga, Oklahoma	Standard	2013-02-20	Valid
N5161U	Cessna 206	Fixed-wing, single engine	Skyler Aviation San Diego, California	Standard	2013-02-20	Valid
N76ED	Cessna P206C	Fixed-wing, single engine	Flying Hawks Ranch LLC Bruning, Nebraska	Standard	2013-02-20	Valid
N9385Q	Beech 58	Fixed-wing, multi-engine	Individual owner Florida	Standard	2013-02-13	Valid
N2258T	Cessna A185E	Fixed-wing, single engine	Jetage Cutting Tech Henderson, Colorado	Standard	2013-02-12	Valid
N6282V	Beech D55	Fixed-wing, multi-engine	Individual owner California	Standard	2013-02-12	Valid
N6924R	Cessna T210H	Fixed-wing, single engine	Turbo Centurion LLC Vail, Arizona	Standard	2013-02-12	Valid
N731AB	Cessna A188B	Fixed-wing, single engine	A & C AG Aviation INC Unadilla, Georgia	Restricted	2013-02-12	Valid
N9004Q	Beech V35B	Fixed-wing, single engine	Luketavious Aviation LLC Madison, Mississippi	Standard	2013-02-11	Valid
N9385G	Cessna A188B	Fixed-wing, single engine	Dakota Aircare INC Wagner, South Dakota	Restricted	2013-02-11	Valid
N320FW	Cessna 320F	Fixed-wing, multi-engine	Individual owner Arizona	Restricted	2013-02-07	Valid
N4536K	Ryan NAVION	Fixed-wing, single engine	Individual owner California	Standard	2013-02-07	Valid
N8343N	Beech V35A	Fixed-wing, single engine	Individual owner Minnesota	Standard	2013-02-06	Valid
N4430W	Beech V35B	Fixed-wing, single engine	Magerit Aviation INC South Boston, Massachusetts	Standard	2013-02-04	Valid
N8784V	Bellanca 17-31ATC	Fixed-wing, single engine	Individual owner Georgia	Standard	2013-02-04	Valid
N5272U	Cessna 206	Fixed-wing, single engine	Aerial Surveys INC Conway, Arkansas	Standard	2013-01-30	Valid
N3706Q	Beech V35	Fixed-wing, single engine	Co-owned owner Washington	Standard	2013-01-29	Valid
N86SS	Cessna A185F	Fixed-wing, single engine	Aerobanc of America INC Camarillo, California	Standard	2013-01-29	Valid
N1557W	Beech 58	Fixed-wing, multi-engine	557 Whiskey LLC Superior, Wisconsin	Standard	2013-01-24	Valid
N7368V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Wyoming	Standard	2013-01-23	Valid
N49PG	Beech V35	Fixed-wing, single engine	Individual owner Ohio	Standard	2013-01-22	Valid
N6285N	Beech A36	Fixed-wing, single engine	Moon Dipper Aviation LLC Deerfield Beach, Florida	Standard	2013-01-22	Valid
N70288	Cessna A188B	Fixed-wing, single engine	Dakota Aircare INC Wagner, South Dakota	Restricted	2013-01-22	Valid
N3664T	Beech A36	Fixed-wing, single engine	Jdm Aviation LLC Marceline, Missouri	Standard	2013-01-18	Valid
N690FS	Beech D55	Fixed-wing, multi-engine	Co-owned owner Alabama	Standard	2013-01-17	Valid
N7725R	Beech D55	Fixed-wing, multi-engine	Lynn Cain LLC Augusta, Arkansas	Standard	2013-01-15	Valid
N5883J	Beech S35	Fixed-wing, single engine	Individual owner California	Standard	2013-01-14	Valid
N91116	Cessna 207	Fixed-wing, single engine	Adventure Airways INC Homer, Alaska	Standard	2013-01-14	Valid
N301PL	Cessna P206B	Fixed-wing, single engine	Individual owner Texas	Standard	2013-01-11	Valid
N361AH	Beech 58P	Fixed-wing, multi-engine	Individual owner U.S. Virgin Islands	Standard	2013-01-10	Valid
N4324W	Beech E-55	Fixed-wing, multi-engine	White River Trucking INC Mason, Wisconsin	Standard	2013-01-08	Valid
N2667M	Bellanca 17-30A	Fixed-wing, single engine	Yce Consulting INC Easton, Pennsylvania	Standard	2013-01-07	Valid
N334SE	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	2013-01-04	Valid
N65Q	Beech F33A	Fixed-wing, single engine	Tvs LLC Oak Park, Illinois	Standard	2013-01-02	Valid
N6736G	Beech A36	Fixed-wing, single engine	Individual owner Kansas	Standard	2013-01-02	Valid
N775T	Beech V35B	Fixed-wing, single engine	Individual owner Nevada	Standard	2013-01-02	Valid
N7491N	Beech E33A	Fixed-wing, single engine	Farm Systems INC Luverne, Minnesota	Standard	2012-12-28	Valid
N907CE	Cessna A185F	Fixed-wing, single engine	Co-owned owner Texas	Standard	2012-12-21	Valid
N1809L	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	2012-12-19	Valid
N8263A	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	2012-12-19	Valid
N882T	Beech S35	Fixed-wing, single engine	Going Bonanzas LLC Scottsdale, Arizona	Standard	2012-12-18	Valid
N7201N	Beech V35A	Fixed-wing, single engine	Co-owned owner California	Standard	2012-12-07	Valid
N28025	Bellanca 17-30A	Fixed-wing, single engine	Withheld at owner's request	Standard	2012-12-05	Valid
N9107Q	Beech A36	Fixed-wing, single engine	Ritter Disposables INC Marion, Arkansas	Standard	2012-12-04	Valid
N100FM	Beech D55	Fixed-wing, multi-engine	Individual owner Florida	Standard	2012-12-03	Valid
N155L	Beech D55	Fixed-wing, multi-engine	Individual owner Texas	Standard	2012-12-03	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