The U.S. aircraft register, updated daily
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

01,1342,2673,4004,5341219403719502,62719604,53419701,114198018919905200022010

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

016314662950005101520224

Parts most often reported as the reports name them

Cylinder26Cylinder Head25Relay20Hub14Circuit Breaker13Antenna12Line12Bolt10Bracket9Control Cable9

Latest reports

2024-04-06Engine: power loss
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
Where they are
Biggest operators
Airworthiness

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 modelGroupOwner and baseCertificateRegisteredStatus
N444RU Beech
V35B
Fixed-wing, single engine Individual owner
Texas
Standard 2023-07-26 ValidFAA registration status code V: Valid registration. All codes
N532E Beech
F33A
Fixed-wing, single engine Blue Pointe Aviation LLC
Valparaiso, Indiana
Standard 2023-07-26 ValidFAA registration status code V: Valid registration. All codes
N555SP Beech
D55
Fixed-wing, multi-engine Individual owner
Texas
Standard 2023-07-26 ValidFAA registration status code V: Valid registration. All codes
N7786R Beech
V35A
Fixed-wing, single engine Individual owner
Texas
Standard 2023-07-26 ValidFAA registration status code V: Valid registration. All codes
N8630Z Cessna
P206C
Fixed-wing, single engine Alaska Village Missions
Homer, Alaska
Standard 2023-07-26 ValidFAA registration status code V: Valid registration. All codes
N9225Q Beech
F33A
Fixed-wing, single engine Th Real Estate Solutions LLC
Bossier City, Louisiana
Standard 2023-07-26 ValidFAA registration status code V: Valid registration. All codes
N2177S Cessna
210L
Fixed-wing, single engine Ferkin Planes LLC
Caldwell, Idaho
Standard 2023-07-25 ValidFAA registration status code V: Valid registration. All codes
N185DJ Cessna
A185F
Fixed-wing, single engine Joy Solutions LLC
Wilmington, Delaware
Standard 2023-07-24 ValidFAA registration status code V: Valid registration. All codes
N6428S Beech
V35B
Fixed-wing, single engine Individual owner
California
Standard 2023-07-24 ValidFAA registration status code V: Valid registration. All codes
N892WW Beech
F33A
Fixed-wing, single engine Individual owner
Tennessee
Standard 2023-07-24 ValidFAA registration status code V: Valid registration. All codes
N2033L Beech
F33A
Fixed-wing, single engine Co-owned owner
West Virginia
Standard 2023-07-23 ValidFAA registration status code V: Valid registration. All codes
N6732Z Beech
A36
Fixed-wing, single engine Air Pear LLC
Yakima, Washington
Standard 2023-07-22 ValidFAA registration status code V: Valid registration. All codes
N7313V Bellanca
17-30
Fixed-wing, single engine
Standard 2023-07-22 ValidFAA registration status code V: Valid registration. All codes
N1736W Beech
V35B
Fixed-wing, single engine Ambitious Aviation LLC
Newport News, Virginia
Standard 2023-07-21 ValidFAA registration status code V: Valid registration. All codes
N925SL Beech
A36
Fixed-wing, single engine Innovative Aviation LLC
Deatsville, Alabama
Standard 2023-07-21 ValidFAA registration status code V: Valid registration. All codes
N3874G Cessna
U206B
Fixed-wing, single engine Co-owned owner
Alaska
Standard 2023-07-20 ValidFAA registration status code V: Valid registration. All codes
N185SM Cessna
A185F
Fixed-wing, single engine Co-owned owner
Oklahoma
Standard 2023-07-19 ValidFAA registration status code V: Valid registration. All codes
N66KW Beech
F33A
Fixed-wing, single engine Individual owner
California
Standard 2023-07-19 ValidFAA registration status code V: Valid registration. All codes
N7173N Beech
V35A
Fixed-wing, single engine Individual owner
Texas
Standard 2023-07-19 ValidFAA registration status code V: Valid registration. All codes
N741RV Beech
F33A
Fixed-wing, single engine International Fun Place Hangar 32 LLC
Laughlin, Nevada
Standard 2023-07-19 ValidFAA registration status code V: Valid registration. All codes
N3694L Beech
58
Fixed-wing, multi-engine Withheld at owner's request
Standard 2023-07-14 ValidFAA registration status code V: Valid registration. All codes
N6148F Cessna
210H
Fixed-wing, single engine Individual owner
Texas
Standard 2023-07-13 ValidFAA registration status code V: Valid registration. All codes
N6283N Beech
A36
Fixed-wing, single engine Valiair Lc Trustee
Casper, Wyoming
Standard 2023-07-13 ValidFAA registration status code V: Valid registration. All codes
N12RC Beech
V35B
Fixed-wing, single engine Individual owner
Oregon
Standard 2023-07-12 ValidFAA registration status code V: Valid registration. All codes
N7476N Beech
V35A
Fixed-wing, single engine Individual owner
Oregon
Standard 2023-07-12 ValidFAA registration status code V: Valid registration. All codes
N724BH Beech
D55
Fixed-wing, multi-engine Individual owner
California
Standard 2023-07-11 ValidFAA registration status code V: Valid registration. All codes
N1LX Beech
A36
Fixed-wing, single engine Individual owner
Virginia
Standard 2023-07-10 ValidFAA registration status code V: Valid registration. All codes
N9461Q Beech
V35B
Fixed-wing, single engine Individual owner
Washington
Standard 2023-07-10 ValidFAA registration status code V: Valid registration. All codes
N9436S Beech
95-C55
Fixed-wing, multi-engine Co-owned owner
Kansas
Standard 2023-07-09 ValidFAA registration status code V: Valid registration. All codes
N6260V Beech
V35
Fixed-wing, single engine Pcb Aircraft
Johnstown, Ohio
Standard 2023-07-08 ValidFAA registration status code V: Valid registration. All codes
N7287R Beech
A36
Fixed-wing, single engine Tailwinds INC
Norwalk, Iowa
Standard 2023-07-08 ValidFAA registration status code V: Valid registration. All codes
N2514X Cessna
P206
Fixed-wing, single engine Co-owned owner
California
Standard 2023-07-07 ValidFAA registration status code V: Valid registration. All codes
N36VG Beech
A36
Fixed-wing, single engine Mitchell Aviation LLC
Mitchell, South Dakota
Standard 2023-07-07 ValidFAA registration status code V: Valid registration. All codes
N14909 Bellanca
17-30A
Fixed-wing, single engine Co-owned owner
Texas
Standard 2023-07-06 ValidFAA registration status code V: Valid registration. All codes
N1423G Beech
35-B33
Fixed-wing, single engine Individual owner
Wisconsin
Standard 2023-07-05 ValidFAA registration status code V: Valid registration. All codes
N4090S Beech
A36
Fixed-wing, single engine Individual owner
Texas
Standard 2023-07-05 ValidFAA registration status code V: Valid registration. All codes
N523AM Beech
A36
Fixed-wing, single engine Sigma Aviation LLC
Vancouver, Washington
Standard 2023-07-05 ValidFAA registration status code V: Valid registration. All codes
N6200V Beech
V35
Fixed-wing, single engine Individual owner
Texas
Standard 2023-07-05 ValidFAA registration status code V: Valid registration. All codes
N70070 Cessna
A185E
Fixed-wing, single engine Bay Air INC
Dillingham, Alaska
Standard 2023-07-03 ValidFAA registration status code V: Valid registration. All codes
N7921K Beech
S35
Fixed-wing, single engine Individual owner
Tennessee
Standard 2023-07-03 ValidFAA registration status code V: Valid registration. All codes
N28068 Bellanca
17-30A
Fixed-wing, single engine Individual owner
Illinois
Standard 2023-07-01 ValidFAA registration status code V: Valid registration. All codes
N5014R Cessna
A185F
Fixed-wing, single engine Cooper Flying INC
Lamesa, Texas
Standard 2023-07-01 ValidFAA registration status code V: Valid registration. All codes
N2667S Cessna
210L
Fixed-wing, single engine Marcum Aviation Maintenance Services LLC
Galena, Ohio
Standard 2023-06-30 ValidFAA registration status code V: Valid registration. All codes
N5604K Beech
S35
Fixed-wing, single engine X-Country Ventures LLC
Usafa, Colorado
Standard 2023-06-29 ValidFAA registration status code V: Valid registration. All codes
N6945R Cessna
T210H
Fixed-wing, single engine Individual owner
Texas
Standard 2023-06-29 ValidFAA registration status code V: Valid registration. All codes
N333BE Aero Commander
500-A
Fixed-wing, multi-engine Ntn3N LLC
Titusville, Florida
Multiple 2023-06-28 ValidFAA registration status code V: Valid registration. All codes
N37BS Beech
A36
Fixed-wing, single engine Co-owned owner
North Carolina
Standard 2023-06-28 ValidFAA registration status code V: Valid registration. All codes
N713MG Beech
V35B
Fixed-wing, single engine My Multifamily Investments LLC
Dallas, Texas
Standard 2023-06-28 ValidFAA registration status code V: Valid registration. All codes
N18396 Beech
E-55
Fixed-wing, multi-engine Drec 0419 LLC
Carson, California
Standard 2023-06-27 ValidFAA registration status code V: Valid registration. All codes
N438T Beech
V35B
Fixed-wing, single engine Individual owner
North Carolina
Standard 2023-06-27 ValidFAA registration status code V: Valid registration. All codes
N831RM Beech
A36
Fixed-wing, single engine Co-owned owner
Florida
Standard 2023-06-27 ValidFAA registration status code V: Valid registration. All codes
N98899 Cessna
310R
Fixed-wing, multi-engine Air Z Flying Service INC
Willoughby, Ohio
Standard 2023-06-27 ValidFAA registration status code V: Valid registration. All codes
N219ML Beech
95-C55
Fixed-wing, multi-engine Co-owned owner
Arizona
Standard 2023-06-26 ValidFAA registration status code V: Valid registration. All codes
N474DB Cessna
310R
Fixed-wing, multi-engine Mr Restore Services INC
Vero Beach, Florida
Standard 2023-06-26 ValidFAA registration status code V: Valid registration. All codes
N9570Q Beech
36
Fixed-wing, single engine Individual owner
Texas
Standard 2023-06-26 ValidFAA registration status code V: Valid registration. All codes
N28026 Bellanca
17-30A
Fixed-wing, single engine Co-owned owner
Minnesota
Standard 2023-06-24 ValidFAA registration status code V: Valid registration. All codes
N3866Y Cessna
210D
Fixed-wing, single engine Individual owner
Ohio
Standard 2023-06-24 ValidFAA registration status code V: Valid registration. All codes
N791Q Beech
D55
Fixed-wing, multi-engine 791Q LLC
Rock Springs, Wyoming
Standard 2023-06-23 ValidFAA registration status code V: Valid registration. All codes
N185LJ Cessna
A185F
Fixed-wing, single engine Individual owner
Alaska
Standard 2023-06-21 ValidFAA registration status code V: Valid registration. All codes
N731UF Cessna
A188B
Fixed-wing, single engine Individual owner
Missouri
Restricted 2023-06-21 ValidFAA registration status code V: Valid registration. All codes
N858LP Beech
58
Fixed-wing, multi-engine Fulps Aviation LLC
Winston Salem, North Carolina
Standard 2023-06-21 ValidFAA registration status code V: Valid registration. All codes
N1239F Cessna
A185F
Fixed-wing, single engine Individual owner
Maine
Multiple 2023-06-20 ValidFAA registration status code V: Valid registration. All codes
N3704A Beech
A36
Fixed-wing, single engine Individual owner
Washington
Standard 2023-06-20 ValidFAA registration status code V: Valid registration. All codes
N43KB Boling Kenneth L
WHEELER EXPRESS FT
Fixed-wing, single engine Individual owner
California
Experimental 2023-06-20 ValidFAA registration status code V: Valid registration. All codes
N4820E Cessna
A185F
Fixed-wing, single engine Individual owner
Oregon
Standard 2023-06-20 ValidFAA registration status code V: Valid registration. All codes
N9074Q Beech
A36
Fixed-wing, single engine Co-owned owner
Oklahoma
Standard 2023-06-20 ValidFAA registration status code V: Valid registration. All codes
N325DC Beech
58
Fixed-wing, multi-engine Gmg Aviation LLC
Ehrhardt, South Carolina
Standard 2023-06-19 ValidFAA registration status code V: Valid registration. All codes
N354KP Beech
S35
Fixed-wing, single engine Tri County Flying Club LLP
Estelline, South Dakota
Standard 2023-06-18 ValidFAA registration status code V: Valid registration. All codes
N8377Q Cessna
A185F
Fixed-wing, single engine Individual owner
Montana
Standard 2023-06-18 ValidFAA registration status code V: Valid registration. All codes
N2261L Beech
A36
Fixed-wing, single engine Tenacity Air LLC
Rockingham, Virginia
Standard 2023-06-17 ValidFAA registration status code V: Valid registration. All codes
N3024Q Beech
F33A
Fixed-wing, single engine Individual owner
Tennessee
Standard 2023-06-17 ValidFAA registration status code V: Valid registration. All codes
N107H Beech
95-C55
Fixed-wing, multi-engine Mission Accomplished LLC
Boca Raton, Florida
Standard 2023-06-16 ValidFAA registration status code V: Valid registration. All codes
N171CE Beech
A36
Fixed-wing, single engine Individual owner
Texas
Standard 2023-06-15 ValidFAA registration status code V: Valid registration. All codes
N4095A Cessna
A185F
Fixed-wing, single engine Valiair Limited Company Trustee
Casper, Wyoming
Standard 2023-06-15 ValidFAA registration status code V: Valid registration. All codes
N627DJ Cessna Aircraft Co
A185F
Fixed-wing, single engine Individual owner
Alaska
Multiple 2023-06-15 ValidFAA registration status code V: Valid registration. All codes
N6298X Beech
A36
Fixed-wing, single engine N111Es INC
Monticello, Indiana
Standard 2023-06-15 ValidFAA registration status code V: Valid registration. All codes
N102Q Beech
95-C55
Fixed-wing, multi-engine Air N Travel LLC
Cannelburg, Indiana
Standard 2023-06-14 ValidFAA registration status code V: Valid registration. All codes
N1039A Beech
V35A
Fixed-wing, single engine 39A LLC
Sioux Falls, South Dakota
Standard 2023-06-14 ValidFAA registration status code V: Valid registration. All codes
N35LF Beech
V35B
Fixed-wing, single engine Plane Fun INC Tr Trustee
Snellville, Georgia
Standard 2023-06-14 ValidFAA registration status code V: Valid registration. All codes
N8753Z Cessna
P206D
Fixed-wing, single engine Bloated Armadillo Adventures CORP
Wilmington, Delaware
Standard 2023-06-14 ValidFAA registration status code V: Valid registration. All codes
N977AG Beech
95-C55
Fixed-wing, multi-engine Flying T Farms LLC
Callao, Missouri
Standard 2023-06-14 ValidFAA registration status code V: Valid registration. All codes
N9LD Cessna
310R
Fixed-wing, multi-engine Great Atlantic Aeroplane CO INC
Sebring, Florida
Standard 2023-06-14 ValidFAA registration status code V: Valid registration. All codes
N28181 Bellanca
17-30A
Fixed-wing, single engine Cheslar Aviation LLC
Lewes, Delaware
Standard 2023-06-13 ValidFAA registration status code V: Valid registration. All codes
N48TZ Beech
A36
Fixed-wing, single engine Visibility Unlimited LLC
Carbon, Indiana
Standard 2023-06-13 ValidFAA registration status code V: Valid registration. All codes
N17PK Beech
S35
Fixed-wing, single engine Co-owned owner
North Carolina
Standard 2023-06-12 ValidFAA registration status code V: Valid registration. All codes
N2617X Cessna
P206
Fixed-wing, single engine 2Gl P&I LLC
El Paso, Texas
Standard 2023-06-12 ValidFAA registration status code V: Valid registration. All codes
N6686V Bellanca
17-30
Fixed-wing, single engine Withheld at owner's request
Standard 2023-06-12 ValidFAA registration status code V: Valid registration. All codes
N185ET Cessna
A185F
Fixed-wing, single engine Taliaferro Aviation LLC
Ardmore, Oklahoma
Standard 2023-06-11 ValidFAA registration status code V: Valid registration. All codes
N20RL Beech
V35B
Fixed-wing, single engine Individual owner
Mississippi
Standard 2023-06-09 ValidFAA registration status code V: Valid registration. All codes
N2215T Cessna
A185E
Fixed-wing, single engine Backcountry Wagons LLC
Kalispell, Montana
Standard 2023-06-09 ValidFAA registration status code V: Valid registration. All codes
N2981T Aero Commander
200D
Fixed-wing, single engine Kool-E5 LLC
Valdosta, Georgia
Standard 2023-06-09 ValidFAA registration status code V: Valid registration. All codes
N411SM Cessna
310R
Fixed-wing, multi-engine Individual owner
Montana
Standard 2023-06-09 ValidFAA registration status code V: Valid registration. All codes
N6WW Beech
58
Fixed-wing, multi-engine Wintons Wings LLC
Bardstown, Kentucky
Standard 2023-06-09 ValidFAA registration status code V: Valid registration. All codes
N8536K Cessna
A185E
Fixed-wing, single engine Withheld at owner's request
Standard 2023-06-09 ValidFAA registration status code V: Valid registration. All codes
N1701W Beech
V35B
Fixed-wing, single engine Jagz Aviation LLC
Akron, Ohio
Standard 2023-06-08 ValidFAA registration status code V: Valid registration. All codes
N312CR Beech
36
Fixed-wing, single engine Mjk Air LLC
Estes Park, Colorado
Standard 2023-06-08 ValidFAA registration status code V: Valid registration. All codes
N5050L Beech
A36
Fixed-wing, single engine Individual owner
Texas
Standard 2023-06-08 ValidFAA registration status code V: Valid registration. All codes
N7193N Beech
V35A
Fixed-wing, single engine Co-owned owner
Rhode Island
Standard 2023-06-08 ValidFAA registration status code V: Valid registration. All codes
N8176R Beech
F33C
Fixed-wing, single engine Individual owner
Georgia
Standard 2023-06-08 ValidFAA registration status code V: Valid registration. All codes
N101JH Cessna
210L
Fixed-wing, single engine Hi-Per Aviation INC
Arroyo Grande, California
Standard 2023-06-07 ValidFAA registration status code V: Valid registration. All codes
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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.