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	Status
N5691K	Beech S35	Fixed-wing, single engine	Individual owner Texas	Standard	Pending
N5753K	Beech S35	Fixed-wing, single engine	Individual owner Texas	Standard	Sale reported
N5786K	Beech S35	Fixed-wing, single engine	Rocket Investments LLC Independence, Missouri	Standard	Valid
N5849K	Beech S35	Fixed-wing, single engine	Rich Lucas Aircraft Sales LLC Lincoln Park, New Jersey	Standard	Valid
N584BL	Beech 58	Fixed-wing, multi-engine	Individual owner Colorado	Standard	Sale reported
N587RK	Beech F33A	Fixed-wing, single engine	Individual owner California	Standard	Pending
N597T	Beech 95-C55	Fixed-wing, multi-engine	Dan Howard Aircraft Sales LLC Tulsa, Oklahoma	Standard	Valid
N600SM	Cessna 320E	Fixed-wing, multi-engine	Capt Tony 185 LLC Aurora, Colorado	Standard	Valid
N6037P	Beech 58	Fixed-wing, multi-engine	No owner on file	Standard	Assigned, not yet registered
N6052S	Beech F33A	Fixed-wing, single engine	Crosswinds Flight Center INC Drums, Pennsylvania	Standard	Valid
N6130F	Cessna 210H	Fixed-wing, single engine	Bas Part Sales LLC Greeley, Colorado	Standard	Valid
N6163R	Beech A36	Fixed-wing, single engine	Sai Flight Services INC Greer, South Carolina	Standard	Valid
N6266N	Beech A36	Fixed-wing, single engine	Sai Flight Services INC Greer, South Carolina	Standard	Valid
N63858	Beech 58	Fixed-wing, multi-engine	Skyway Aviation INC Jackson, Michigan	Standard	Valid
N64098	Beech V35B	Fixed-wing, single engine	Individual owner Arizona	Standard	Pending
N65JK	Bellanca 17-30A	Fixed-wing, single engine	American Aircraft & Marine LLC Indianapolis, Indiana	Standard	Valid
N6649D	Beech 58	Fixed-wing, multi-engine	Bas Part Sales LLC Greeley, Colorado	Standard	Valid
N6662N	Beech 58	Fixed-wing, multi-engine	Individual owner Texas	Standard	Pending
N67230	Beech A36	Fixed-wing, single engine	Boomerang Air LLC Cedar Park, Texas	Standard	Valid
N67VB	Beech V35	Fixed-wing, single engine	Individual owner Tennessee	Standard	Pending
N6KH	Cessna 310R	Fixed-wing, multi-engine	Individual owner Michigan	Standard	Pending
N70195	Cessna A185E	Fixed-wing, single engine	Individual owner Alaska	Standard	Pending
N7032Q	Cessna U206F	Fixed-wing, single engine	Individual owner Ohio	Multiple	Pending
N7045N	Beech V35A	Fixed-wing, single engine	Indy Air Sales LLC Anderson, Indiana	Standard	Valid
N704BN	Cessna A185F	Fixed-wing, single engine	Wipaire INC South Saint Paul, Minnesota	Standard	Valid
N7066N	Beech E33A	Fixed-wing, single engine	Individual owner Illinois	Standard	Pending
N711KM	Beech V35B	Fixed-wing, single engine	Individual owner Minnesota	Standard	Pending
N7170N	Beech V35A	Fixed-wing, single engine	Individual owner Connecticut	Standard	Valid
N72BG	Beech E-55	Fixed-wing, multi-engine	Individual owner New York	Standard	Pending
N731GD	Cessna A188B	Fixed-wing, single engine	Individual owner Illinois	Restricted	Pending
N731S	Beech D55	Fixed-wing, multi-engine	Individual owner Arizona	Standard	Canceled
N732CH	Cessna 210L	Fixed-wing, single engine	Individual owner Tennessee	Multiple	Pending
N7356V	Bellanca 17-30	Fixed-wing, single engine	Individual owner Montana	Standard	Pending
N7444	Beech A36	Fixed-wing, single engine	Tytex LLC Dallas, Texas	Standard	Valid
N7555N	Beech E33A	Fixed-wing, single engine	South Delta Aviation INC West Helena, Arkansas	Standard	Valid
N765T	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	Pending
N770LA	Beech 58	Fixed-wing, multi-engine	Gulf Airbatics LTD Jennings, Louisiana	Standard	Valid
N777BC	Beech V35	Fixed-wing, single engine	Bas Part Sales LLC Greeley, Colorado	Standard	Valid
N777H	Bellanca 17-30A	Fixed-wing, single engine	Bas Part Sales LLC Greeley, Colorado	Standard	Valid
N79260	Cessna A188B	Fixed-wing, single engine	Individual owner Oklahoma	Restricted	Sale reported
N7999K	Beech S35	Fixed-wing, single engine	Bristol Bay Capital LLC Watkins, Colorado	Standard	Valid
N799PC	Cessna T210F	Fixed-wing, single engine	Individual owner Colorado	Standard	Pending
N7VY	Beech D-45	Fixed-wing, single engine	Individual owner Minnesota	Standard	Pending
N80229	Cessna A185F	Fixed-wing, single engine	Individual owner Wisconsin	Standard	Valid
N8143G	Cessna 210K	Fixed-wing, single engine	Individual owner Nevada	Standard	Pending
N840P	Beech V35A	Fixed-wing, single engine	Individual owner Michigan	Standard	Pending
N8577Q	Beech V35	Fixed-wing, single engine	Individual owner Texas	Standard	Pending
N8623Q	Beech S35	Fixed-wing, single engine	Individual owner Nevada	Standard	Pending
N8670G	Cessna 310R	Fixed-wing, multi-engine	Individual owner Arizona	Standard	Pending
N8710Z	Cessna A185F	Fixed-wing, single engine	Individual owner Colorado	Standard	Valid
N87397	Cessna 310R	Fixed-wing, multi-engine	Smith Aviation LLC Springer, Oklahoma	Standard	Valid
N8785Z	Cessna A185F	Fixed-wing, single engine	Individual owner Washington	Standard	Pending
N8830M	Beech S35	Fixed-wing, single engine	Individual owner Texas	Standard	Pending
N88R	Beech V35B	Fixed-wing, single engine	Individual owner Delaware	Standard	Pending
N9094R	Cessna A188B	Fixed-wing, single engine	Petecraft Aviation Services INC Plains, Georgia	Restricted	Valid
N9099S	Beech A36	Fixed-wing, single engine	Individual owner California	Standard	Pending
N910ST	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Arkansas	Standard	Pending
N9140S	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	Sale reported
N914ST	Cessna A185F	Fixed-wing, single engine	Individual owner Washington	Standard	Pending
N9169Q	Beech A36	Fixed-wing, single engine	Medic Choppers LLC Springdale, Arkansas	Standard	Valid
N9172G	Cessna A188B	Fixed-wing, single engine	Individual owner Montana	Restricted	Pending
N9205R	Cessna A188B	Fixed-wing, single engine	Individual owner Illinois	Restricted	Pending
N9234R	Cessna A188B	Fixed-wing, single engine	Individual owner Iowa	Restricted	Pending
N9239Q	Beech 58	Fixed-wing, multi-engine	Individual owner Alabama	Standard	Pending
N928HB	Beech 58	Fixed-wing, multi-engine	Individual owner New Jersey	Standard	Pending
N928MM	Beech V35A	Fixed-wing, single engine	Individual owner Arizona	Standard	Pending
N9379Q	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	Sale reported
N93887	Cessna 210L	Fixed-wing, single engine	Dan Howard Aircraft Sales LLC Tulsa, Oklahoma	Standard	Valid
N9471N	Cessna A185F	Fixed-wing, single engine	Bas Part Sales LLC Greeley, Colorado	Standard	Valid
N9509G	Cessna A188B	Fixed-wing, single engine	Mid Continent Aircraft CORP Hayti, Missouri	Restricted	Valid
N9515G	Cessna U206F	Fixed-wing, single engine	Individual owner Alaska	Standard	Pending
N9555Q	Beech V35	Fixed-wing, single engine	Individual owner Arizona	Standard	Pending
N9583Q	Beech V35	Fixed-wing, single engine	Hangarfinds LLC Westminster, Colorado	Standard	Valid
N9610E	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Oklahoma	Standard	Canceled
N9618H	Cessna A185F	Fixed-wing, single engine	Individual owner Alaska	Multiple	Pending
N974CP	Beech E-55	Fixed-wing, multi-engine	Individual owner Delaware	Standard	Sale reported
N97BJ	Beech V35	Fixed-wing, single engine	Individual owner Texas	Standard	Pending
N98697	Cessna 402B	Fixed-wing, multi-engine	Gimli Son LLC Fort Lauderdale, Florida	Standard	Valid
N98842	Cessna 310R	Fixed-wing, multi-engine	Dan Howard Aircraft Sales LLC Tulsa, Oklahoma	Standard	Valid
N9925G	Cessna A188A	Fixed-wing, single engine	Petecraft Aviation Services INC Plains, Georgia	Multiple	Valid
N9932G	Cessna A188A	Fixed-wing, single engine	Individual owner Illinois	Multiple	Pending
N9968G	Cessna A188A	Fixed-wing, single engine	Petecraft Aviation Services INC Plains, Georgia	Standard	Valid
N999BS	Cessna 320F	Fixed-wing, multi-engine	Individual owner California	Standard	Sale reported
N99BR	Beech A36	Fixed-wing, single engine	Aircorps Aviation LLC Bemidji, Minnesota	Standard	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