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.

When the aircraft were built by decade

By decade built, as a table
aircraft
194012
195037
19602,627
19704,534
19801,114
1990189
20005
20102

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
Failure reports by year, as a table
reports
9515
962
971
981
995
0037
0148
0258
0346
0435
0562
0617
0718
0817
0910
1020
1115
1213
139
1410
1512
164
172
181
192
202
221
242

Parts most often reported as the reports name them

Cylinder26Cylinder Head25Relay20Hub14Circuit Breaker13Antenna12Line12Bolt10Bracket9Control Cable9
Parts most reported, as a table
reports
Cylinder26
Cylinder Head25
Relay20
Hub14
Circuit Breaker13
Antenna12
Line12
Bolt10
Bracket9
Control 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
N6321C Beech
A36
Fixed-wing, single engine Bdp Solutions LLC
Monroe, Georgia
Standard 2021-07-28 ValidFAA registration status code V: Valid registration. All codes
N185JB Cessna
A185F
Fixed-wing, single engine Co-owned owner
Oregon
Standard 2021-07-27 ValidFAA registration status code V: Valid registration. All codes
N5616S Beech
V35
Fixed-wing, single engine Individual owner
New York
Standard 2021-07-27 ValidFAA registration status code V: Valid registration. All codes
N816N Beech
V35A
Fixed-wing, single engine Midwest Aircraft INC
Wilmington, Delaware
Standard 2021-07-27 ValidFAA registration status code V: Valid registration. All codes
N4878F Cessna
U206A
Fixed-wing, single engine Co-owned owner
Montana
Standard 2021-07-26 ValidFAA registration status code V: Valid registration. All codes
N61387 Cessna
A185F
Fixed-wing, single engine Stash Ventures LLC
Virginia Beach, Virginia
Standard 2021-07-26 ValidFAA registration status code V: Valid registration. All codes
N2221Z Cessna
185A
Fixed-wing, single engine Individual owner
Maine
Standard 2021-07-24 ValidFAA registration status code V: Valid registration. All codes
N31444 Beech
F33A
Fixed-wing, single engine Individual owner
California
Standard 2021-07-24 ValidFAA registration status code V: Valid registration. All codes
N43HP Beech
58
Fixed-wing, multi-engine Barbara Aviation INC
Middletown, Delaware
Standard 2021-07-24 ValidFAA registration status code V: Valid registration. All codes
N30WE Cessna
A185F
Fixed-wing, single engine West Elk Air LLC
Gunnison, Colorado
Standard 2021-07-23 ValidFAA registration status code V: Valid registration. All codes
N54EJ Cessna
A185F
Fixed-wing, single engine High Plains Aviation LLC
Caro, Michigan
Standard 2021-07-23 ValidFAA registration status code V: Valid registration. All codes
N7255R Beech
58
Fixed-wing, multi-engine Zaviation LLC
Fort Smith, Arkansas
Standard 2021-07-23 ValidFAA registration status code V: Valid registration. All codes
N2575X Cessna
P206
Fixed-wing, single engine 360 Solo LLC
San Martin, California
Standard 2021-07-22 ValidFAA registration status code V: Valid registration. All codes
N4765Q Cessna
A188B
Fixed-wing, single engine Digger Dougs Crop Dusting Services INC
Salem, Wisconsin
Restricted 2021-07-22 ValidFAA registration status code V: Valid registration. All codes
N777RA Beech
58
Fixed-wing, multi-engine Individual owner
Georgia
Standard 2021-07-22 ValidFAA registration status code V: Valid registration. All codes
N246BW Bellanca
17-30A
Fixed-wing, single engine Rc Sun Enterprises INC
Loveland, Colorado
Standard 2021-07-21 ValidFAA registration status code V: Valid registration. All codes
N34FH Beech
A36
Fixed-wing, single engine Individual owner
Texas
Standard 2021-07-21 ValidFAA registration status code V: Valid registration. All codes
N91D Beech
D55
Fixed-wing, multi-engine Carterdawg Real Estate and Aircraft Holdings LLC
Fort Worth, Texas
Standard 2021-07-21 ValidFAA registration status code V: Valid registration. All codes
N3102W Beech
V35B
Fixed-wing, single engine Bonanza Leasing LLC
Versailles, Kentucky
Standard 2021-07-20 ValidFAA registration status code V: Valid registration. All codes
N4972F Cessna
U206B
Fixed-wing, single engine Tomahawk Aviation LLC
Reno, Nevada
Standard 2021-07-20 ValidFAA registration status code V: Valid registration. All codes
N4908Q Cessna
A188B
Fixed-wing, single engine 1Lowflyer INC
Harrisonville, Missouri
Restricted 2021-07-19 ValidFAA registration status code V: Valid registration. All codes
N8239R Bellanca
17-30A
Fixed-wing, single engine Individual owner
Georgia
Standard 2021-07-19 ValidFAA registration status code V: Valid registration. All codes
N732PX Cessna
210M
Fixed-wing, single engine Co-owned owner
Tennessee
Standard 2021-07-15 ValidFAA registration status code V: Valid registration. All codes
N732QL Cessna
210M
Fixed-wing, single engine Individual owner
Michigan
Standard 2021-07-15 ValidFAA registration status code V: Valid registration. All codes
N422GR Beech
V35
Fixed-wing, single engine Individual owner
California
Standard 2021-07-14 ValidFAA registration status code V: Valid registration. All codes
N4257S Beech
A36
Fixed-wing, single engine T&S Proch Investments LLC
Harrisonville, Missouri
Standard 2021-07-14 ValidFAA registration status code V: Valid registration. All codes
N7DH Beech
58
Fixed-wing, multi-engine Individual owner
Indiana
Standard 2021-07-14 ValidFAA registration status code V: Valid registration. All codes
N8623Z Cessna
P206C
Fixed-wing, single engine Individual owner
Texas
Standard 2021-07-14 ValidFAA registration status code V: Valid registration. All codes
N7684N Beech
V35A
Fixed-wing, single engine Co-owned owner
Connecticut
Standard 2021-07-13 ValidFAA registration status code V: Valid registration. All codes
N8173C Beech
F33A
Fixed-wing, single engine Jet Pros LLC
Scottsdale, Arizona
Standard 2021-07-12 ValidFAA registration status code V: Valid registration. All codes
N206N Cessna
U206G
Fixed-wing, single engine Moose Venutres LLC
Palo Alto, California
Standard 2021-07-10 ValidFAA registration status code V: Valid registration. All codes
N9697Q Cessna
A185F
Fixed-wing, single engine Individual owner
Delaware
Standard 2021-07-10 ValidFAA registration status code V: Valid registration. All codes
N378GP Beech
F33A
Fixed-wing, single engine E Graham Investments LLC
Sanford, Florida
Standard 2021-07-09 ValidFAA registration status code V: Valid registration. All codes
N5755G Cessna
U206G
Fixed-wing, single engine Destination Alaska Air Service LLC
Homer, Alaska
Standard 2021-07-09 ValidFAA registration status code V: Valid registration. All codes
N6137V Beech
S35
Fixed-wing, single engine Individual owner
Washington
Standard 2021-07-09 ValidFAA registration status code V: Valid registration. All codes
N122RC Cessna
T210K
Fixed-wing, single engine Individual owner
California
Standard 2021-07-08 ValidFAA registration status code V: Valid registration. All codes
N6665V Bellanca
17-30
Fixed-wing, single engine Individual owner
Colorado
Standard 2021-07-08 ValidFAA registration status code V: Valid registration. All codes
N185JJ Cessna
A185E
Fixed-wing, single engine Individual owner
North Carolina
Standard 2021-07-07 ValidFAA registration status code V: Valid registration. All codes
N6582V Bellanca
17-30
Fixed-wing, single engine Individual owner
California
Standard 2021-07-07 ValidFAA registration status code V: Valid registration. All codes
N72285 Cessna
U206D
Fixed-wing, single engine Cave Creek Organics LLC
Flagstaff, Arizona
Standard 2021-07-07 ValidFAA registration status code V: Valid registration. All codes
N6058A Beech
58
Fixed-wing, multi-engine Alpha Air LLC
Sparks, Nevada
Standard 2021-07-02 ValidFAA registration status code V: Valid registration. All codes
N122SN Beech
V35B
Fixed-wing, single engine Individual owner
Texas
Standard 2021-07-01 ValidFAA registration status code V: Valid registration. All codes
N1717Y Cessna
U206G
Fixed-wing, single engine Seventeen Yankee LLC
Fort Lauderdale, Florida
Standard 2021-07-01 ValidFAA registration status code V: Valid registration. All codes
N93619 Bellanca
17-30A
Fixed-wing, single engine Individual owner
Texas
Standard 2021-07-01 ValidFAA registration status code V: Valid registration. All codes
N6275E Cessna
A185F
Fixed-wing, single engine Valiair Limited CO Trustee
Casper, Wyoming
Standard 2021-06-30 ValidFAA registration status code V: Valid registration. All codes
N200LD Cessna
210L
Fixed-wing, single engine Co-owned owner
Oregon
Standard 2021-06-29 ValidFAA registration status code V: Valid registration. All codes
N444DG Beech
V35B
Fixed-wing, single engine Individual owner
Arizona
Standard 2021-06-28 ValidFAA registration status code V: Valid registration. All codes
N4887V Bellanca
17-30
Fixed-wing, single engine Individual owner
North Dakota
Standard 2021-06-28 ValidFAA registration status code V: Valid registration. All codes
N6161F Cessna
210H
Fixed-wing, single engine Beach Bums Air LLC
Martin, Georgia
Standard 2021-06-28 ValidFAA registration status code V: Valid registration. All codes
N49D Beech
58
Fixed-wing, multi-engine Co-owned owner
California
Standard 2021-06-26 ValidFAA registration status code V: Valid registration. All codes
N6610R Cessna
U206G
Fixed-wing, single engine Individual owner
Texas
Standard 2021-06-26 ValidFAA registration status code V: Valid registration. All codes
N7881R Beech
E33A
Fixed-wing, single engine Custom Farm Systems INC
Luverne, Minnesota
Standard 2021-06-26 ValidFAA registration status code V: Valid registration. All codes
N9446N Cessna
A185F
Fixed-wing, single engine Skywagon LLC
Goochland, Virginia
Standard 2021-06-26 ValidFAA registration status code V: Valid registration. All codes
N9495S Beech
V35
Fixed-wing, single engine Lsa LLC
Kalispell, Montana
Standard 2021-06-26 ValidFAA registration status code V: Valid registration. All codes
N997BC Beech
S35
Fixed-wing, single engine 997Bc LLC
Roseburg, Oregon
Standard 2021-06-26 ValidFAA registration status code V: Valid registration. All codes
N35QT Beech
V35A
Fixed-wing, single engine Ready Aim Flyer LLC
New Castle, Delaware
Standard 2021-06-25 ValidFAA registration status code V: Valid registration. All codes
N28106 Bellanca
17-30A
Fixed-wing, single engine Adams Charles J
Santa Maria, California
Standard 2021-06-24 ValidFAA registration status code V: Valid registration. All codes
N3825M Beech
A36
Fixed-wing, single engine Individual owner
North Carolina
Standard 2021-06-23 ValidFAA registration status code V: Valid registration. All codes
N927MW Beech
V35B
Fixed-wing, single engine Individual owner
Florida
Standard 2021-06-23 ValidFAA registration status code V: Valid registration. All codes
N2630X Cessna
P206
Fixed-wing, single engine Bbjc Adventures LLC
Jackson, Wisconsin
Standard 2021-06-22 ValidFAA registration status code V: Valid registration. All codes
N7218H Beech
F33A
Fixed-wing, single engine Individual owner
Georgia
Standard 2021-06-22 ValidFAA registration status code V: Valid registration. All codes
N7802F Cessna
A185F
Fixed-wing, single engine Individual owner
Arizona
Standard 2021-06-22 ValidFAA registration status code V: Valid registration. All codes
N4585S Beech
A36
Fixed-wing, single engine Valiair Limited Company Trustee
Casper, Wyoming
Standard 2021-06-21 ValidFAA registration status code V: Valid registration. All codes
N1819L Beech
A36
Fixed-wing, single engine Black Kettle Inn LLC
Cabool, Missouri
Standard 2021-06-19 ValidFAA registration status code V: Valid registration. All codes
N20603 Beech
V35B
Fixed-wing, single engine Burlington Air Center INC
Burlington, Wisconsin
Standard 2021-06-19 ValidFAA registration status code V: Valid registration. All codes
N4711F Cessna
P206B
Fixed-wing, single engine Charter Equine INC
Amarillo, Texas
Standard 2021-06-19 ValidFAA registration status code V: Valid registration. All codes
N5767J Cessna
210K
Fixed-wing, single engine Valiair Limited CO Trustee
Casper, Wyoming
Standard 2021-06-19 ValidFAA registration status code V: Valid registration. All codes
N58TM Beech
E-55
Fixed-wing, multi-engine Bobcat Air LLC
Maddock, North Dakota
Standard 2021-06-19 ValidFAA registration status code V: Valid registration. All codes
N9863Q Cessna
A185F
Fixed-wing, single engine Wattum Investments LLC
Kodiak, Alaska
Multiple 2021-06-17 ValidFAA registration status code V: Valid registration. All codes
N218CG Beech
A36
Fixed-wing, single engine Individual owner
California
Standard 2021-06-16 ValidFAA registration status code V: Valid registration. All codes
N221DP Beech
36
Fixed-wing, single engine Individual owner
Montana
Standard 2021-06-16 ValidFAA registration status code V: Valid registration. All codes
N4720Q Cessna
A185E
Fixed-wing, single engine Individual owner
Maine
Standard 2021-06-15 ValidFAA registration status code V: Valid registration. All codes
N6044N Cessna
A185F
Fixed-wing, single engine B407 LLC
Seattle, Washington
Standard 2021-06-15 ValidFAA registration status code V: Valid registration. All codes
N1812W Beech
E-55
Fixed-wing, multi-engine Co-owned owner
Texas
Standard 2021-06-14 ValidFAA registration status code V: Valid registration. All codes
N93842 Cessna
A185F
Fixed-wing, single engine N93842 LLC
Blanding, Utah
Standard 2021-06-14 ValidFAA registration status code V: Valid registration. All codes
N7934R Beech
36
Fixed-wing, single engine La Playa LLC
Wilmington, Delaware
Standard 2021-06-12 ValidFAA registration status code V: Valid registration. All codes
N11PE Cessna
P337H
Fixed-wing, multi-engine Air Caribbean INC
Dover, Delaware
Standard 2021-06-10 ValidFAA registration status code V: Valid registration. All codes
N1979B Bellanca
17-30A
Fixed-wing, single engine Individual owner
Texas
Standard 2021-06-10 ValidFAA registration status code V: Valid registration. All codes
N4059B Bellanca
17-30A
Fixed-wing, single engine Individual owner
Arizona
Standard 2021-06-10 ValidFAA registration status code V: Valid registration. All codes
N434L Beech
V35A
Fixed-wing, single engine Qualitair LLC Trustee
Michelstadt,
Standard 2021-06-10 ValidFAA registration status code V: Valid registration. All codes
N541DB Beech
S35
Fixed-wing, single engine Individual owner
California
Standard 2021-06-10 ValidFAA registration status code V: Valid registration. All codes
N7DM Beech
58
Fixed-wing, multi-engine Individual owner
Mississippi
Standard 2021-06-10 ValidFAA registration status code V: Valid registration. All codes
N511MB Cessna
310R
Fixed-wing, multi-engine Individual owner
Pennsylvania
Standard 2021-06-09 ValidFAA registration status code V: Valid registration. All codes
N6689V Bellanca
17-30
Fixed-wing, single engine Individual owner
Texas
Standard 2021-06-08 ValidFAA registration status code V: Valid registration. All codes
N70AU Cessna
A185F
Fixed-wing, single engine Qty LLC
Wilmington, Delaware
Standard 2021-06-08 ValidFAA registration status code V: Valid registration. All codes
N210EG Cessna
210J
Fixed-wing, single engine Centurion Aviation LLC
Nokesville, Virginia
Standard 2021-06-07 ValidFAA registration status code V: Valid registration. All codes
N7219C Beech
F33A
Fixed-wing, single engine Designs International INC
Johnston, Rhode Island
Standard 2021-06-07 ValidFAA registration status code V: Valid registration. All codes
N97M Aero Commander
200D
Fixed-wing, single engine Individual owner
Texas
Standard 2021-06-07 ValidFAA registration status code V: Valid registration. All codes
N1684W Beech
V35B
Fixed-wing, single engine Co-owned owner
Arizona
Standard 2021-06-04 ValidFAA registration status code V: Valid registration. All codes
N336T Beech
A36
Fixed-wing, single engine Tophatter85 LLC
Kirksville, Missouri
Standard 2021-06-04 ValidFAA registration status code V: Valid registration. All codes
N735ED Cessna
A185F
Fixed-wing, single engine State of North Carolina
Morehead City, North Carolina
Standard 2021-06-04 ValidFAA registration status code V: Valid registration. All codes
N77AB Beech
E33C
Fixed-wing, single engine Emap Aviation LLC
Tavernier, Florida
Standard 2021-06-03 ValidFAA registration status code V: Valid registration. All codes
N21641 Cessna
A188B
Fixed-wing, single engine Individual owner
Nebraska
Restricted 2021-06-02 ValidFAA registration status code V: Valid registration. All codes
N4138T Cessna
320D
Fixed-wing, multi-engine Lindquist Holdings LLC
Noblesville, Indiana
Standard 2021-06-02 ValidFAA registration status code V: Valid registration. All codes
N24136 Beech
A36
Fixed-wing, single engine Tj Air Holding INC Trustee
Wilmington, Delaware
Standard 2021-06-01 ValidFAA registration status code V: Valid registration. All codes
N732VU Cessna
210M
Fixed-wing, single engine Vhv Aviation LLC
Rome, Georgia
Standard 2021-06-01 ValidFAA registration status code V: Valid registration. All codes
N732XT Cessna
210M
Fixed-wing, single engine B&S Air Holdings LLC
Fort Myers, Florida
Standard 2021-06-01 ValidFAA registration status code V: Valid registration. All codes
N2076L Beech
A36
Fixed-wing, single engine Individual owner
Tennessee
Standard 2021-05-27 ValidFAA registration status code V: Valid registration. All codes
N278R Beech
A36
Fixed-wing, single engine Individual owner
Mississippi
Standard 2021-05-27 ValidFAA registration status code V: Valid registration. All codes
N5097J Cessna
310R
Fixed-wing, multi-engine Individual owner
Massachusetts
Standard 2021-05-27 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.