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
N14MB	Beech A36	Fixed-wing, single engine	Co-owned owner Idaho	Standard	2010-06-24	Valid
N4587S	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2010-06-23	Valid
N5806F	Cessna 210F	Fixed-wing, single engine	Jones Flying Association Wilmington, Delaware	Standard	2010-06-23	Valid
N4300Q	Cessna A185F	Fixed-wing, single engine	Co-owned owner Washington	Standard	2010-06-21	Valid
N176ST	Beech A36	Fixed-wing, single engine	Cp A36 INC Knoxville, Tennessee	Standard	2010-06-15	Valid
N94206	Cessna 210L	Fixed-wing, single engine	Individual owner Maryland	Standard	2010-06-15	Valid
N1841R	Cessna A185F	Fixed-wing, single engine	Co-owned owner Oregon	Standard	2010-06-04	Valid
N33ZX	Beech A36	Fixed-wing, single engine	Individual owner Florida	Standard	2010-05-28	Valid
N211Y	Beech 95-C55	Fixed-wing, multi-engine	Withheld at owner's request	Standard	2010-05-26	Valid
N2233S	Cessna 210L	Fixed-wing, single engine	Co-owned owner Illinois	Standard	2010-05-25	Valid
N917DC	Beech A36	Fixed-wing, single engine	Withheld at owner's request	Standard	2010-05-17	Valid
N2021U	Beech 58	Fixed-wing, multi-engine	All Airline Pilot Training LLC Delray Beach, Florida	Standard	2010-05-14	Valid
N9188M	Cessna U206E	Fixed-wing, single engine	Individual owner Alaska	Standard	2010-05-13	Valid
N8266M	Cessna 210K	Fixed-wing, single engine	Centurion Aviation LLC Groveland, Florida	Standard	2010-05-04	Valid
N2059A	Beech V35B	Fixed-wing, single engine	Individual owner Missouri	Standard	2010-04-30	Valid
N119TT	Beech V35B	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2010-04-28	Valid
N5611S	Beech V35	Fixed-wing, single engine	Individual owner Texas	Standard	2010-04-27	Valid
N48CC	Beech 58	Fixed-wing, multi-engine	C Baron LLC Lafayette, Louisiana	Standard	2010-04-26	Valid
N9575G	Cessna U206F	Fixed-wing, single engine	Golden Eagle Outfitters Delta Junction, Alaska	Standard	2010-04-19	Valid
N684WT	Beech A36	Fixed-wing, single engine	Co-owned owner California	Standard	2010-04-15	Valid
N8403Q	Cessna A185F	Fixed-wing, single engine	Individual owner Utah	Standard	2010-04-14	Valid
N600ZZ	Beech A36	Fixed-wing, single engine	Gsair INC Wilmington, Delaware	Standard	2010-04-08	Valid
N5750K	Beech S35	Fixed-wing, single engine	Individual owner Arizona	Standard	2010-04-06	Valid
N3994Q	Cessna A185F	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2010-04-05	Valid
N4171S	Beech A36	Fixed-wing, single engine	Individual owner Arizona	Standard	2010-04-05	Valid
N1346G	Cessna 310R	Fixed-wing, multi-engine	Clear Blue Aviation LLC Melbourne, Florida	Standard	2010-04-01	Valid
N4189S	Beech A36	Fixed-wing, single engine	High Planes Holdings LLC Lexington, Nebraska	Standard	2010-03-29	Valid
N555LF	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2010-03-29	Valid
N8106N	Beech F33A	Fixed-wing, single engine	Continental Enterprise LLC Holladay, Utah	Standard	2010-03-18	Valid
N8335Q	Cessna A185F	Fixed-wing, single engine	Flying M Aviation LLC Twin Falls, Idaho	Standard	2010-02-24	Valid
N179KD	Beech V35	Fixed-wing, single engine	Tblc LLC Princeton, New Jersey	Standard	2010-02-22	Valid
N185BG	Cessna A185F	Fixed-wing, single engine	Rig Air LLC Alamogordo, New Mexico	Standard	2010-02-19	Valid
N2678X	Cessna P206A	Fixed-wing, single engine	Individual owner Texas	Standard	2010-02-19	Valid
N7973K	Beech S35	Fixed-wing, single engine	Dreams A Loft LLC Santa Barbara, California	Standard	2010-02-18	Valid
N5226U	Cessna 206	Fixed-wing, single engine	Individual owner Texas	Standard	2010-02-12	Valid
N1784E	Cessna 310R	Fixed-wing, multi-engine	High Road Time LLC West Palm Beach, Florida	Standard	2010-02-11	Valid
N3111J	Beech F33A	Fixed-wing, single engine	Air Arkansas INC Wilmington, Delaware	Standard	2010-02-10	Valid
N1031W	Beech A36	Fixed-wing, single engine	Bilco Air LLC Danville, Illinois	Standard	2010-02-04	Valid
N727VC	Beech E33A	Fixed-wing, single engine	Pd Aircraft LLP Webster, Minnesota	Standard	2010-02-02	Valid
N36M	Beech A36	Fixed-wing, single engine	Msl Group LLC Waxhaw, North Carolina	Standard	2010-01-22	Valid
N255MA	Beech 95-C55	Fixed-wing, multi-engine	Kmco INC Lenexa, Kansas	Standard	2010-01-21	Valid
N100DZ	Cessna U206B	Fixed-wing, single engine	Skydive Santa Barbara LLC Lompoc, California	Standard	2010-01-15	Valid
N3778Y	Cessna 210F	Fixed-wing, single engine	Time Air LLC Mendon, Utah	Standard	2010-01-14	Valid
N54GV	Cessna 207A	Fixed-wing, single engine	Alaska Aircraft Leasing LLC Silverdale, Washington	Standard	2010-01-13	Valid
N1663R	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Standard	2010-01-08	Valid
N122E	Cessna 310Q	Fixed-wing, multi-engine	One Two Two Echo Aviation LLC Cincinnati, Ohio	Standard	2010-01-07	Valid
N35XL	Beech S35	Fixed-wing, single engine	Individual owner California	Standard	2010-01-07	Valid
N5431U	Beech V35	Fixed-wing, single engine	Individual owner Tennessee	Standard	2010-01-07	Valid
N7476Q	Cessna U206F	Fixed-wing, single engine	Individual owner Texas	Standard	2010-01-07	Valid
N888NE	Beech V35B	Fixed-wing, single engine	Farmex Land Mgmt INC Sanger, California	Standard	2010-01-07	Valid
N949SF	Cessna 210N	Fixed-wing, single engine	Rasmussen Agribusiness INC Antelope, Montana	Standard	2010-01-07	Valid
N999HQ	Cessna 310R	Fixed-wing, multi-engine	Proclaim Aviation Ministries Worthington, Minnesota	Standard	2010-01-07	Valid
N18302	Beech A36	Fixed-wing, single engine	Allison Aircraft Sales LLC Avon, Connecticut	Standard	2010-01-04	Valid
N7166K	Beech 58	Fixed-wing, multi-engine	Co-owned owner Texas	Standard	2010-01-04	Valid
N764T	Beech A36	Fixed-wing, single engine	Individual owner Arizona	Standard	2009-12-31	Valid
N71991	Cessna U206D	Fixed-wing, single engine	Bush-Tell INC Aniak, Alaska	Restricted	2009-12-29	Valid
N3214R	Beech F33A	Fixed-wing, single engine	Lima Delta CO Trustee New Castle, Delaware	Standard	2009-12-24	Valid
N624NP	Beech V35A	Fixed-wing, single engine	Individual owner Illinois	Standard	2009-12-21	Valid
N37350	Beech A36	Fixed-wing, single engine	Co-owned owner Missouri	Standard	2009-12-16	Valid
N756QG	Cessna U206G	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2009-12-16	Valid
N2506X	Cessna P206	Fixed-wing, single engine	Individual owner Illinois	Standard	2009-12-04	Valid
N97SR	Blanton D L/Blanton P J BLANTON SPRT RCR SPR	Fixed-wing, single engine	Individual owner Kansas	Experimental	2009-12-03	Valid
N123EP	Cessna A185F	Fixed-wing, single engine	Individual owner Texas	Multiple	2009-12-01	Valid
N4JX	Beech V35B	Fixed-wing, single engine	Individual owner California	Standard	2009-11-30	Valid
N24L	Beech S35	Fixed-wing, single engine	Individual owner California	Standard	2009-11-19	Valid
N9430Q	Beech V35B	Fixed-wing, single engine	Individual owner North Carolina	Standard	2009-11-17	Valid
N62854	Beech A36	Fixed-wing, single engine	High Flight Connections LLC Roanoke, Indiana	Standard	2009-11-05	Valid
N32631	Beech V35B	Fixed-wing, single engine	Individual owner Iowa	Standard	2009-11-04	Valid
N93VT	Beech V35B	Fixed-wing, single engine	Individual owner Arizona	Standard	2009-11-04	Valid
N26795	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Texas	Standard	2009-11-03	Valid
N6625N	Cessna 210N	Fixed-wing, single engine	Co-owned owner California	Standard	2009-11-02	Valid
N9JP	Cessna 210L	Fixed-wing, single engine	Echo Air INC Woodstock, Georgia	Standard	2009-10-28	Valid
N421DN	Cessna 421	Fixed-wing, multi-engine	Del Mar College Corpus Christi, Texas	Standard	2009-10-26	Valid
N761QY	Cessna 210M	Fixed-wing, single engine	Yardbird CORP Nevada, Iowa	Standard	2009-10-26	Valid
N76AC	Beech A36	Fixed-wing, single engine	Tennessee Aviation Company LLC Knoxville, Tennessee	Standard	2009-10-23	Valid
N8423N	Beech V35A	Fixed-wing, single engine	Individual owner Iowa	Standard	2009-10-22	Valid
N53059	Cessna A185F	Fixed-wing, single engine	Co-owned owner California	Multiple	2009-10-21	Valid
N54LL	Cessna A185E	Fixed-wing, single engine	Ryan Good Aviation LLC Sioux Falls, South Dakota	Standard	2009-10-20	Valid
N7424N	Cessna A185F	Fixed-wing, single engine	Co-owned owner Colorado	Standard	2009-10-20	Valid
N266G	Beech 95-C55	Fixed-wing, multi-engine	Individual owner Wisconsin	Standard	2009-10-15	Valid
N7156N	Beech V35A	Fixed-wing, single engine	Co-owned owner Arizona	Standard	2009-10-15	Valid
N761LQ	Cessna 210M	Fixed-wing, single engine	Flying Pharaohs LLC Fredericksburg, Virginia	Standard	2009-10-14	Valid
N7875R	Beech V35A	Fixed-wing, single engine	Co-owned owner Iowa	Standard	2009-10-14	Valid
N7905R	Beech A36	Fixed-wing, single engine	Co-owned owner Arizona	Standard	2009-10-14	Valid
N412T	Cessna 210L	Fixed-wing, single engine	Executive Aviation LLC Peoria, Arizona	Standard	2009-10-13	Valid
N416GF	Beech S35	Fixed-wing, single engine	Individual owner Minnesota	Standard	2009-10-13	Valid
N9141Q	Beech F33A	Fixed-wing, single engine	Bear Air LLC Elizabeth City, North Carolina	Standard	2009-10-09	Valid
N6640X	Beech A36	Fixed-wing, single engine	Central Pennsylvania Aircraft Leasing LLC Boiling Springs, Pennsylvania	Standard	2009-10-08	Valid
N504JC	Cessna A185F	Fixed-wing, single engine	Frequent Flyer LLC Manasquan, New Jersey	Standard	2009-10-07	Valid
N4824F	Cessna TU206A	Fixed-wing, single engine	Co-owned owner Idaho	Multiple	2009-10-06	Valid
N8759Z	Cessna P206D	Fixed-wing, single engine	Co-owned owner Arizona	Standard	2009-10-06	Valid
N3175P	Beech F33A	Fixed-wing, single engine	Individual owner Georgia	Standard	2009-10-01	Valid
N331EB	Beech F33A	Fixed-wing, single engine	Individual owner Indiana	Standard	2009-09-29	Valid
N7902M	Beech V35	Fixed-wing, single engine	Big Blue Sky LLC Indianapolis, Indiana	Standard	2009-09-29	Valid
N104JS	Cessna 182Q	Fixed-wing, single engine	Individual owner California	Standard	2009-09-22	Valid
N1570U	Cessna 207	Fixed-wing, single engine	Reno70 LLC Anchorage, Alaska	Standard	2009-09-22	Valid
N4648S	Beech A36	Fixed-wing, single engine	Individual owner Kansas	Standard	2009-09-22	Valid
N575SL	Beech S35	Fixed-wing, single engine	Individual owner Tennessee	Standard	2009-09-21	Valid
N18308	Beech A36	Fixed-wing, single engine	Jlmc Blackland LLC Marietta, Georgia	Standard	2009-09-15	Valid
N299BG	Beech F33A	Fixed-wing, single engine	Harrison Rv INC Jefferson, Iowa	Standard	2009-09-14	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