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
N2065Y Beech
V35B
Fixed-wing, single engine Abel Instruments INC
Riviera Beach, Florida
Standard 2022-08-25 ValidFAA registration status code V: Valid registration. All codes
N5461J Cessna
310R
Fixed-wing, multi-engine Glyn Dwr Aviation LLC
Kalispell, Montana
Standard 2022-08-25 ValidFAA registration status code V: Valid registration. All codes
N6127R Cessna
T210F
Fixed-wing, single engine Individual owner
California
Standard 2022-08-25 ValidFAA registration status code V: Valid registration. All codes
N1437A Beech
V35A
Fixed-wing, single engine Co-owned owner
Florida
Standard 2022-08-23 ValidFAA registration status code V: Valid registration. All codes
N6370S Beech
V35B
Fixed-wing, single engine Individual owner
Texas
Standard 2022-08-23 ValidFAA registration status code V: Valid registration. All codes
N7085N Beech
D55
Fixed-wing, multi-engine Individual owner
Washington
Standard 2022-08-23 ValidFAA registration status code V: Valid registration. All codes
N3BW Beech
V35B
Fixed-wing, single engine 4Rc LLC
Kenedy, Texas
Standard 2022-08-19 ValidFAA registration status code V: Valid registration. All codes
N5822F Cessna
210G
Fixed-wing, single engine Individual owner
Illinois
Standard 2022-08-19 ValidFAA registration status code V: Valid registration. All codes
N777AK Beech
A36
Fixed-wing, single engine Safeco Leasing LLC
Port Alsworth, Alaska
Standard 2022-08-19 ValidFAA registration status code V: Valid registration. All codes
N7932M Beech
V35
Fixed-wing, single engine Individual owner
South Dakota
Standard 2022-08-19 ValidFAA registration status code V: Valid registration. All codes
N6284U Beech
A36
Fixed-wing, single engine Bonanza Group LLC
Phoenix, Arizona
Standard 2022-08-18 ValidFAA registration status code V: Valid registration. All codes
N14706 Bellanca
17-30A
Fixed-wing, single engine Individual owner
Texas
Standard 2022-08-17 ValidFAA registration status code V: Valid registration. All codes
N14744 Bellanca
17-30A
Fixed-wing, single engine Individual owner
Texas
Standard 2022-08-17 ValidFAA registration status code V: Valid registration. All codes
N1527W Beech
V35B
Fixed-wing, single engine
Standard 2022-08-17 ValidFAA registration status code V: Valid registration. All codes
N490DB Cessna
U206G
Fixed-wing, single engine Pybus Air LLC
Alpine, Utah
Standard 2022-08-16 ValidFAA registration status code V: Valid registration. All codes
N6830R Cessna
T210G
Fixed-wing, single engine Individual owner
Florida
Standard 2022-08-15 ValidFAA registration status code V: Valid registration. All codes
N7366R Beech
F33A
Fixed-wing, single engine Individual owner
Ohio
Standard 2022-08-15 ValidFAA registration status code V: Valid registration. All codes
N2778T Beech
95-C55
Fixed-wing, multi-engine Individual owner
Texas
Standard 2022-08-13 ValidFAA registration status code V: Valid registration. All codes
N446R Beech
V35
Fixed-wing, single engine Individual owner
Arizona
Standard 2022-08-13 ValidFAA registration status code V: Valid registration. All codes
N81AD Cessna
401A
Fixed-wing, multi-engine Mr Dent INC
Manheim, Pennsylvania
Standard 2022-08-13 ValidFAA registration status code V: Valid registration. All codes
N15454 Beech
F33A
Fixed-wing, single engine Jb Transportation LLC
Peoria, Arizona
Standard 2022-08-12 ValidFAA registration status code V: Valid registration. All codes
N16AW Bellanca
17-30A
Fixed-wing, single engine Individual owner
California
Standard 2022-08-12 ValidFAA registration status code V: Valid registration. All codes
N317EP Beech
V35A
Fixed-wing, single engine Co-owned owner
Virginia
Standard 2022-08-12 ValidFAA registration status code V: Valid registration. All codes
N3785Y Cessna
210D
Fixed-wing, single engine Co-owned owner
Louisiana
Standard 2022-08-12 ValidFAA registration status code V: Valid registration. All codes
N26WL Beech
58
Fixed-wing, multi-engine Trio Leasing LLC
Highland, Michigan
Standard 2022-08-11 ValidFAA registration status code V: Valid registration. All codes
N3673U Beech
58
Fixed-wing, multi-engine Castor Care LLC
Mount Pleasant, South Carolina
Standard 2022-08-11 ValidFAA registration status code V: Valid registration. All codes
N2791T Beech
95-C55
Fixed-wing, multi-engine Individual owner
North Carolina
Standard 2022-08-10 ValidFAA registration status code V: Valid registration. All codes
N34K Cessna
A185F
Fixed-wing, single engine Ch Aviation LLC
Wilmington, Delaware
Standard 2022-08-10 ValidFAA registration status code V: Valid registration. All codes
N412Y Beech
V35B
Fixed-wing, single engine Individual owner
Texas
Standard 2022-08-10 ValidFAA registration status code V: Valid registration. All codes
N5890J Beech
S35
Fixed-wing, single engine Individual owner
California
Standard 2022-08-10 ValidFAA registration status code V: Valid registration. All codes
N18BK Cessna
310R
Fixed-wing, multi-engine Shandog Air LLC
Ashland, Kentucky
Standard 2022-08-09 ValidFAA registration status code V: Valid registration. All codes
N4747V Bellanca
17-30
Fixed-wing, single engine Withheld at owner's request
Standard 2022-08-08 ValidFAA registration status code V: Valid registration. All codes
N830SW Cessna
A185F
Fixed-wing, single engine N830Sw LLC
Valley Center, Kansas
Standard 2022-08-06 ValidFAA registration status code V: Valid registration. All codes
N63JL Beech
E-55
Fixed-wing, multi-engine Co-owned owner
Texas
Standard 2022-08-05 ValidFAA registration status code V: Valid registration. All codes
N921MK Beech
V35B
Fixed-wing, single engine Cognito Design INC
Punta Gorda, Florida
Standard 2022-08-05 ValidFAA registration status code V: Valid registration. All codes
N73RH Beech
V35B
Fixed-wing, single engine Bradley A Eli Dental CORP
Encinitas, California
Standard 2022-08-03 ValidFAA registration status code V: Valid registration. All codes
N1040F Cessna
A185F
Fixed-wing, single engine Individual owner
Arkansas
Standard 2022-08-02 ValidFAA registration status code V: Valid registration. All codes
N29WC Beech
A36
Fixed-wing, single engine 29Wc INC
Malta, New York
Standard 2022-08-02 ValidFAA registration status code V: Valid registration. All codes
N3318Q Cessna
320D
Fixed-wing, multi-engine 2400 Rickenbacker LLC DBA
Auburn, California
Standard 2022-08-02 ValidFAA registration status code V: Valid registration. All codes
N9157R Cessna
A188B
Fixed-wing, single engine Individual owner
Oregon
Restricted 2022-08-02 ValidFAA registration status code V: Valid registration. All codes
N359BD Cessna
210N
Fixed-wing, single engine Individual owner
Texas
Standard 2022-08-01 ValidFAA registration status code V: Valid registration. All codes
N185JY Cessna
A185F
Fixed-wing, single engine Rnc Flight Service LLC
Bedford, Wyoming
Standard 2022-07-30 ValidFAA registration status code V: Valid registration. All codes
N20DM Piper
PA-23-250
Fixed-wing, multi-engine Lowe Aviation CO
Macon, Georgia
Standard 2022-07-30 ValidFAA registration status code V: Valid registration. All codes
N23724 Beech
A36
Fixed-wing, single engine Co-owned owner
California
Standard 2022-07-30 ValidFAA registration status code V: Valid registration. All codes
N3511V Beech
V35B
Fixed-wing, single engine Cypress Creek Shooting Lodge LLC
Greenbrier, Arkansas
Standard 2022-07-30 ValidFAA registration status code V: Valid registration. All codes
N3SU Beech
95-C55
Fixed-wing, multi-engine Individual owner
Georgia
Standard 2022-07-30 ValidFAA registration status code V: Valid registration. All codes
N5949F Cessna
210H
Fixed-wing, single engine Individual owner
Texas
Standard 2022-07-30 ValidFAA registration status code V: Valid registration. All codes
N83KP Beech
F33A
Fixed-wing, single engine Individual owner
New York
Standard 2022-07-30 ValidFAA registration status code V: Valid registration. All codes
N8783Z Cessna
P206D
Fixed-wing, single engine Adventure Aircraft and Equipment LLC
Chelan, Washington
Standard 2022-07-30 ValidFAA registration status code V: Valid registration. All codes
N60134 Cessna
U206F
Fixed-wing, single engine Co-owned owner
Alaska
Standard 2022-07-29 ValidFAA registration status code V: Valid registration. All codes
N7389V Bellanca
17-30
Fixed-wing, single engine Individual owner
Illinois
Standard 2022-07-29 ValidFAA registration status code V: Valid registration. All codes
N8372N Beech
V35A
Fixed-wing, single engine Co-owned owner
Arizona
Standard 2022-07-27 ValidFAA registration status code V: Valid registration. All codes
N944EM Bellanca
17-30A
Fixed-wing, single engine Individual owner
Florida
Standard 2022-07-27 ValidFAA registration status code V: Valid registration. All codes
N2662X Cessna
P206
Fixed-wing, single engine Tail Aero CORP
Wilmington, Delaware
Standard 2022-07-26 ValidFAA registration status code V: Valid registration. All codes
N7841M Beech
S35
Fixed-wing, single engine Docmax LLC
Tucson, Arizona
Standard 2022-07-26 ValidFAA registration status code V: Valid registration. All codes
N343ZM Beech
A45
Fixed-wing, single engine Buzzard Aviation LLC
St Simons Island, Georgia
Standard 2022-07-23 ValidFAA registration status code V: Valid registration. All codes
N5831K Beech
S35
Fixed-wing, single engine Co-owned owner
California
Standard 2022-07-23 ValidFAA registration status code V: Valid registration. All codes
N94285 Cessna
210L
Fixed-wing, single engine Great Lakes Enterprises
Heron, Montana
Standard 2022-07-23 ValidFAA registration status code V: Valid registration. All codes
N9HG Beech
V35B
Fixed-wing, single engine Individual owner
Oklahoma
Standard 2022-07-23 ValidFAA registration status code V: Valid registration. All codes
N159GM Beech
F33A
Fixed-wing, single engine Army Air Corps LLC
Wilmington, Delaware
Standard 2022-07-21 ValidFAA registration status code V: Valid registration. All codes
N6397S Beech
V35B
Fixed-wing, single engine Its Allgood Air LLC
Lewes, Delaware
Standard 2022-07-21 ValidFAA registration status code V: Valid registration. All codes
N933J Beech
F33A
Fixed-wing, single engine L&N Aviation LLC
Wilmington, Delaware
Standard 2022-07-21 ValidFAA registration status code V: Valid registration. All codes
N7613N Beech
D55
Fixed-wing, multi-engine N7613N LLC
Lewes, Delaware
Standard 2022-07-20 ValidFAA registration status code V: Valid registration. All codes
N111TM Beech
V35B
Fixed-wing, single engine Ireland David A
Eatonville, Washington
Standard 2022-07-19 ValidFAA registration status code V: Valid registration. All codes
N823T Beech
V35B
Fixed-wing, single engine Individual owner
Texas
Standard 2022-07-16 ValidFAA registration status code V: Valid registration. All codes
N87ST Cessna
A185F
Fixed-wing, single engine Trygg Holdings LLC
Anchorage, Alaska
Standard 2022-07-16 ValidFAA registration status code V: Valid registration. All codes
N9177Z Beech
F33A
Fixed-wing, single engine Shine Transportation Leasing LLC
Winchester, Virginia
Standard 2022-07-16 ValidFAA registration status code V: Valid registration. All codes
N211V Beech
F33A
Fixed-wing, single engine Co-owned owner
Arizona
Standard 2022-07-15 ValidFAA registration status code V: Valid registration. All codes
N7259R Beech
A36
Fixed-wing, single engine Co-owned owner
Ohio
Standard 2022-07-15 ValidFAA registration status code V: Valid registration. All codes
N2110L Beech
58
Fixed-wing, multi-engine Malco Power Design CO INC
La Marque, Texas
Standard 2022-07-14 ValidFAA registration status code V: Valid registration. All codes
N2296D Beech
V35B
Fixed-wing, single engine Bonanza Flyers L3C
Murray, Utah
Standard 2022-07-14 ValidFAA registration status code V: Valid registration. All codes
N390HW Beech
V35A
Fixed-wing, single engine Co-owned owner
Florida
Standard 2022-07-14 ValidFAA registration status code V: Valid registration. All codes
N77KA Beech
D55
Fixed-wing, multi-engine Co-owned owner
Virginia
Standard 2022-07-14 ValidFAA registration status code V: Valid registration. All codes
N70183 Cessna
A185E
Fixed-wing, single engine Individual owner
Alaska
Multiple 2022-07-13 ValidFAA registration status code V: Valid registration. All codes
N82LW Cessna
U206F
Fixed-wing, single engine Vine Alaska INC
Fairbanks, Alaska
Standard 2022-07-13 ValidFAA registration status code V: Valid registration. All codes
N340LC Beech
35-C33A
Fixed-wing, single engine Chase 13 LLC
Wilmington, Delaware
Standard 2022-07-12 ValidFAA registration status code V: Valid registration. All codes
N4419A Beech
V35B
Fixed-wing, single engine Individual owner
Arizona
Standard 2022-07-12 ValidFAA registration status code V: Valid registration. All codes
N6689J Beech
V35B
Fixed-wing, single engine Ace Technical Services LLC
Hernando, Mississippi
Standard 2022-07-12 ValidFAA registration status code V: Valid registration. All codes
N8TZ Beech
A36
Fixed-wing, single engine Th Aero Services LLC
Leawood, Kansas
Standard 2022-07-12 ValidFAA registration status code V: Valid registration. All codes
N246AL Beech
A36
Fixed-wing, single engine Airor LLC
Lees Summit, Missouri
Standard 2022-07-11 ValidFAA registration status code V: Valid registration. All codes
N2729T Beech
V35
Fixed-wing, single engine Individual owner
New York
Standard 2022-07-11 ValidFAA registration status code V: Valid registration. All codes
N9134S Beech
58
Fixed-wing, multi-engine Daytona Aircraft Services INC
Daytona Beach, Florida
Standard 2022-07-11 ValidFAA registration status code V: Valid registration. All codes
N9496H Cessna
A185F
Fixed-wing, single engine Co-owned owner
Alaska
Restricted 2022-07-11 ValidFAA registration status code V: Valid registration. All codes
N70ME Beech
V35B
Fixed-wing, single engine Individual owner
West Virginia
Standard 2022-07-09 ValidFAA registration status code V: Valid registration. All codes
N210NH Cessna
210L
Fixed-wing, single engine Individual owner
Georgia
Standard 2022-07-08 ValidFAA registration status code V: Valid registration. All codes
N215BF Beech
S35
Fixed-wing, single engine Individual owner
Minnesota
Standard 2022-07-07 ValidFAA registration status code V: Valid registration. All codes
N1577L Beech
A36
Fixed-wing, single engine Koga CORP INC
Las Vegas, Nevada
Standard 2022-07-05 ValidFAA registration status code V: Valid registration. All codes
N4689Q Cessna
210L
Fixed-wing, single engine Individual owner
Oregon
Standard 2022-07-02 ValidFAA registration status code V: Valid registration. All codes
N9041V Beech
F33A
Fixed-wing, single engine Individual owner
Maryland
Standard 2022-07-02 ValidFAA registration status code V: Valid registration. All codes
N555WT Beech
F33A
Fixed-wing, single engine High Speed Low Drag Aviation LLC
Hamilton, Montana
Standard 2022-07-01 ValidFAA registration status code V: Valid registration. All codes
N111RM Beech
F33A
Fixed-wing, single engine Barrix Investments LLC
Weatherford, Texas
Standard 2022-06-30 ValidFAA registration status code V: Valid registration. All codes
N25662 Beech
V35B
Fixed-wing, single engine Atcnavion LLC
Hinckley, Ohio
Standard 2022-06-30 ValidFAA registration status code V: Valid registration. All codes
N87363 Cessna
310R
Fixed-wing, multi-engine Janeair LLC
Acworth, Georgia
Standard 2022-06-30 ValidFAA registration status code V: Valid registration. All codes
N131PB Cessna
310R
Fixed-wing, multi-engine Tom Tatum Pa
Danville, Arkansas
Standard 2022-06-29 ValidFAA registration status code V: Valid registration. All codes
N759VL Beech
A36
Fixed-wing, single engine Individual owner
Hawaii
Standard 2022-06-29 ValidFAA registration status code V: Valid registration. All codes
N227MW Beech
V35B
Fixed-wing, single engine Co-owned owner
Texas
Standard 2022-06-28 ValidFAA registration status code V: Valid registration. All codes
N25665 Beech
F33A
Fixed-wing, single engine Individual owner
California
Standard 2022-06-28 ValidFAA registration status code V: Valid registration. All codes
N300K Beech
E-55
Fixed-wing, multi-engine Individual owner
South Carolina
Standard 2022-06-28 ValidFAA registration status code V: Valid registration. All codes
N579DM Beech
A36
Fixed-wing, single engine Individual owner
Texas
Standard 2022-06-28 ValidFAA registration status code V: Valid registration. All codes
N75C Cessna
A185F
Fixed-wing, single engine Individual owner
Indiana
Standard 2022-06-28 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.