Engines · piston (reciprocating) · data as of October 7, 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

Beechcraft V35 Bonanza1,496Beechcraft A36 Bonanza1,145Cessna A185 Skywagon1,143Beechcraft F33 Bonanza872Cessna 210 Centurion767Cessna U206 Stationair641Beechcraft 58 Baron466Bellanca 17 Viking456Beechcraft S35 Bonanza439Cessna 310303Cessna A188230Beechcraft E-55193

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

Kind of aircraft

Piston singles7,845 (83%)Piston twins1,371 (14%)Turboprops268 (3%)

When the aircraft were built by decade

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

Parts most often reported as the reports name them

Cylinder26Cylinder Head25Relay20Hub14Circuit Breaker13Antenna12Line12Bolt10Bracket9Control Cable9

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

These connections as data: /graph/engine/continental-io-520-series.json · about the eFlight graph.

Aircraft newest certificates first · 9,484

Tail no.	Maker and model	Group	Owner and base	Certificate	Registered	Status
N5874J	Beech S35	Fixed-wing, single engine	My Flight LLC Cypress, Texas	Standard	2024-03-19	Valid
N14FM	Beech S35	Fixed-wing, single engine	Individual owner Texas	Standard	2024-03-18	Valid
N476W	Beech V35B	Fixed-wing, single engine	Individual owner Florida	Standard	2024-03-18	Valid
N250G	Beech V35A	Fixed-wing, single engine	Wasalo and Luby Air LLC La Fayette, Georgia	Standard	2024-03-17	Valid
N3673R	Beech 58	Fixed-wing, multi-engine	Artie Aircraft LLC Trenton, Missouri	Standard	2024-03-16	Valid
N73DE	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2024-03-16	Valid
N185WC	Cessna A185E	Fixed-wing, single engine	Individual owner Montana	Standard	2024-03-15	Valid
N84LB	Beech E-55	Fixed-wing, multi-engine	Individual owner North Carolina	Standard	2024-03-15	Valid
N2050N	Beech A36	Fixed-wing, single engine	Individual owner Texas	Standard	2024-03-14	Valid
N4768F	Cessna TP206B	Fixed-wing, single engine	Individual owner Florida	Standard	2024-03-14	Valid
N711HR	Beech A36	Fixed-wing, single engine	Individual owner Oklahoma	Standard	2024-03-14	Valid
N777NT	Cessna 210L	Fixed-wing, single engine	N777Nt LLC Fort Mill, South Carolina	Standard	2024-03-14	Valid
N17561	Beech V35B	Fixed-wing, single engine	Individual owner Florida	Standard	2024-03-13	Valid
N4181S	Beech A36	Fixed-wing, single engine	Arizona Type Ratings LLC Sedona, Arizona	Standard	2024-03-13	Valid
N87490	Cessna 310R	Fixed-wing, multi-engine	Individual owner Idaho	Standard	2024-03-13	Valid
N3471G	Cessna 310R	Fixed-wing, multi-engine	Co-owned owner Michigan	Standard	2024-03-12	Valid
N4554F	Cessna A185E	Fixed-wing, single engine	Individual owner New York	Standard	2024-03-12	Valid
N5DL	Beech A36	Fixed-wing, single engine	Individual owner Georgia	Standard	2024-03-12	Valid
N249TJ	Beech 95-C55	Fixed-wing, multi-engine	F Korbel & Bros Guerneville, California	Standard	2024-03-11	Valid
N2886W	Beech V35B	Fixed-wing, single engine	Individual owner Alabama	Standard	2024-03-11	Valid
N733KD	Cessna U206G	Fixed-wing, single engine	Lake Clark Holdings LLC Port Alsworth, Alaska	Standard	2024-03-11	Valid
N7867R	Beech 36	Fixed-wing, single engine	Blue House Veterinary LLC Buffalo Lake, Minnesota	Standard	2024-03-11	Valid
N44NK	Beech D55	Fixed-wing, multi-engine	Individual owner Pennsylvania	Standard	2024-03-08	Valid
N4866K	Ryan NAVION	Fixed-wing, single engine	Navion Aviation LLC Littleton, Colorado	Standard	2024-03-08	Valid
N6185C	Beech A36	Fixed-wing, single engine	Individual owner Virginia	Standard	2024-03-08	Valid
N85KA	Cessna A185F	Fixed-wing, single engine	Individual owner Texas	Standard	2024-03-08	Valid
N185LL	Cessna A185F	Fixed-wing, single engine	North River Air LLC Kodiak, Alaska	Standard	2024-03-07	Valid
N3168P	Beech F33A	Fixed-wing, single engine	Maxwell Aviation Holdings LLC Kalispell, Montana	Standard	2024-03-07	Valid
N777TK	Beech 58	Fixed-wing, multi-engine	Professional Paving Services LLC Macon, Georgia	Standard	2024-03-07	Valid
N7936A	Beech A36	Fixed-wing, single engine	Bb Air Guys LLC Scott City, Kansas	Standard	2024-03-07	Valid
N8522N	Bellanca 17-30A	Fixed-wing, single engine	Vega Aviation Services LLC Loxahatchee, Florida	Standard	2024-03-07	Valid
N231S	Beech V35	Fixed-wing, single engine	Vinegaroon Aviation LLC Franklin, Tennessee	Standard	2024-03-06	Valid
N520XX	Delcambre William J Ii GLASAIR II TD	Fixed-wing, single engine	Individual owner Florida	Experimental	2024-03-06	Valid
N77WS	Cessna P206E	Fixed-wing, single engine	Withheld at owner's request	Standard	2024-03-06	Valid
N1255V	Cessna U206F	Fixed-wing, single engine	Individual owner Montana	Standard	2024-03-05	Valid
N2919T	Aero Commander 200D	Fixed-wing, single engine	Individual owner Tennessee	Standard	2024-03-05	Valid
N404MD	Beech S35	Fixed-wing, single engine	Individual owner Washington	Standard	2024-03-05	Valid
N4698R	Beech E33A	Fixed-wing, single engine	Co-owned owner California	Standard	2024-03-05	Valid
N716DS	Beech F33A	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2024-03-05	Valid
N843T	Beech V35B	Fixed-wing, single engine	Individual owner Texas	Standard	2024-03-05	Valid
N4135B	Bellanca 17-30A	Fixed-wing, single engine	Individual owner South Carolina	Standard	2024-03-04	Valid
N4850J	Beech V35	Fixed-wing, single engine	Individual owner Michigan	Standard	2024-03-03	Valid
N9351Q	Beech F33A	Fixed-wing, single engine	Individual owner Massachusetts	Standard	2024-03-01	Valid
N581G	Beech 58	Fixed-wing, multi-engine	Individual owner Alabama	Standard	2024-02-29	Valid
N93535	Bellanca 17-30A	Fixed-wing, single engine	Northbase LLC Columbus, Mississippi	Standard	2024-02-29	Valid
N185WG	Cessna A185F	Fixed-wing, single engine	Pioneer General Engineering INC Fallon, Nevada	Standard	2024-02-28	Valid
N206GM	Cessna U206G	Fixed-wing, single engine	Destination Alaska Air Service LLC Homer, Alaska	Standard	2024-02-28	Valid
N7915M	Beech 35-C33A	Fixed-wing, single engine	Blue Sky Aviation LLC Northport, Alabama	Standard	2024-02-28	Valid
N888PL	Cessna 210M	Fixed-wing, single engine	Individual owner Texas	Standard	2024-02-28	Valid
N2649X	Cessna P206	Fixed-wing, single engine	K-Mcj Equipment LLC Longview, Texas	Standard	2024-02-27	Valid
N6491Z	Cessna U206G	Fixed-wing, single engine	Individual owner New York	Standard	2024-02-27	Valid
N65BW	Beech V35	Fixed-wing, single engine	Co-owned owner Oklahoma	Standard	2024-02-27	Valid
N69HZ	Cessna U206D	Fixed-wing, single engine	U206 Ice LLC Pompano Beach, Florida	Standard	2024-02-27	Valid
N9177Q	Beech A36	Fixed-wing, single engine	Papst Bonanza LLC Parker, Arizona	Standard	2024-02-27	Valid
N6025R	Beech A36	Fixed-wing, single engine	Individual owner Ohio	Standard	2024-02-26	Valid
N409V	Beech 95-C55	Fixed-wing, multi-engine		Standard	2024-02-23	Valid
N611DC	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Texas	Standard	2024-02-23	Valid
N8392N	Beech V35A	Fixed-wing, single engine	Individual owner California	Standard	2024-02-23	Valid
N6990Y	Cessna 210D	Fixed-wing, single engine	V Speed Aviation LLC Reno, Nevada	Standard	2024-02-22	Valid
N9599Q	Beech V35	Fixed-wing, single engine	Individual owner North Carolina	Standard	2024-02-22	Valid
N4702M	Beech V35B	Fixed-wing, single engine	Volant Aviation LLC Brenham, Texas	Standard	2024-02-21	Valid
N6742N	Beech 58	Fixed-wing, multi-engine	Crazy Mountains Aviation LLC Columbus, Georgia	Standard	2024-02-21	Valid
N147TB	Bellanca 17-30A	Fixed-wing, single engine	Individual owner Texas	Standard	2024-02-20	Valid
N354DR	Beech V35B	Fixed-wing, single engine	Individual owner Illinois	Standard	2024-02-20	Valid
N106GA	Beech 58	Fixed-wing, multi-engine	Tactical Safety Training LLC Dublin, Georgia	Standard	2024-02-19	Valid
N9623G	Cessna A188B	Fixed-wing, single engine	Black Gulch Aviation LLC Polson, Montana	Restricted	2024-02-19	Valid
N4043A	Beech V35B	Fixed-wing, single engine	Individual owner Nevada	Standard	2024-02-18	Valid
N5739K	Beech S35	Fixed-wing, single engine	Individual owner Wisconsin	Standard	2024-02-18	Valid
N2643Z	Cessna 310R	Fixed-wing, multi-engine	Co-owned owner Georgia	Standard	2024-02-17	Valid
N333SJ	Cessna A185F	Fixed-wing, single engine	Co-owned owner Montana	Standard	2024-02-17	Valid
N756DL	Cessna U206G	Fixed-wing, single engine	Sierra Sky Aviation LLC Kalispell, Montana	Standard	2024-02-17	Valid
N996AK	Cessna U206E	Fixed-wing, single engine	Sierra Sky Aviation LLC Kalispell, Montana	Standard	2024-02-17	Valid
N9482Q	Beech A36	Fixed-wing, single engine	Individual owner South Dakota	Standard	2024-02-16	Valid
N31084	Cessna U206	Fixed-wing, single engine	Individual owner Alaska	Standard	2024-02-15	Valid
N9802Z	Cessna U206G	Fixed-wing, single engine	Big Horn Aviation Group Fort Worth, Texas	Standard	2024-02-15	Valid
N9483Q	Beech V35B	Fixed-wing, single engine	Southwest Investment CO Little Rock, Arkansas	Standard	2024-02-14	Valid
N2082W	Beech V35	Fixed-wing, single engine	Withheld at owner's request	Standard	2024-02-13	Valid
N2209R	Cessna T210H	Fixed-wing, single engine	Pilotsgirl LLC Goldsboro, North Carolina	Standard	2024-02-13	Valid
N711AM	Beech A36	Fixed-wing, single engine	Individual owner New Mexico	Standard	2024-02-13	Valid
N78BF	Beech A36	Fixed-wing, single engine	Sandbar Air LLC Saint Petersburg, Florida	Standard	2024-02-13	Valid
N8401N	Beech E33A	Fixed-wing, single engine	N8401N LLC Cambridge, Nebraska	Standard	2024-02-13	Valid
N185T	Beech V35B	Fixed-wing, single engine	Hsr Creative LLC Indian Trail, North Carolina	Standard	2024-02-12	Valid
N1954L	Cessna U206B	Fixed-wing, single engine	Co-owned owner Alaska	Standard	2024-02-11	Valid
N1836Z	Beech F33A	Fixed-wing, single engine	Brown Farms INC Central City, Nebraska	Standard	2024-02-10	Valid
N592KB	Cessna U206F	Fixed-wing, single engine	Copper River Airmotive LLC Copper Center, Alaska	Multiple	2024-02-10	Valid
N4764Y	Beech V35B	Fixed-wing, single engine	Ok3Wire Properties LLC Pensacola, Florida	Standard	2024-02-09	Valid
N168U	Beech V35A	Fixed-wing, single engine	Leading Edge LLC Scottsdale, Arizona	Standard	2024-02-08	Valid
N185HK	Cessna A185F	Fixed-wing, single engine	Mro Aviation Enterprises LLC Kalispell, Montana	Multiple	2024-02-08	Valid
N354DP	Beech V35	Fixed-wing, single engine	Individual owner Virginia	Standard	2024-02-08	Valid
N3828N	Beech A36	Fixed-wing, single engine	Individual owner Florida	Standard	2024-02-08	Valid
N5040U	Cessna 206	Fixed-wing, single engine	Air Data Solutions LLC Natchitoches, Louisiana	Restricted	2024-02-08	Valid
N7895L	Beech V35	Fixed-wing, single engine	Individual owner Missouri	Standard	2024-02-08	Valid
N28009	Bellanca 17-30A	Fixed-wing, single engine	Co-owned owner Texas	Standard	2024-02-07	Valid
N5648K	Beech S35	Fixed-wing, single engine	Individual owner New York	Standard	2024-02-07	Valid
N6152X	Cessna 310R	Fixed-wing, multi-engine	Individual owner North Carolina	Standard	2024-02-07	Valid
N102S	Beech A36	Fixed-wing, single engine	Bfb Enterprises LLC Larned, Kansas	Standard	2024-02-06	Valid
N1839F	Cessna 210F	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2024-02-05	Valid
N524RT	Beech 58	Fixed-wing, multi-engine	N524Rt LLC Greensboro, North Carolina	Standard	2024-02-05	Valid
N770MP	Beech F33A	Fixed-wing, single engine	Individual owner Michigan	Standard	2024-02-05	Valid
N87412	Cessna 310R	Fixed-wing, multi-engine	Rmb Leasing INC Dover, Delaware	Standard	2024-02-05	Valid

Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 7, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.