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
N310TL Cessna
310R
Fixed-wing, multi-engine Withheld at owner's request
Standard 2023-01-28 ValidFAA registration status code V: Valid registration. All codes
N3131B Bellanca
17-30A
Fixed-wing, single engine Individual owner
North Dakota
Standard 2023-01-28 ValidFAA registration status code V: Valid registration. All codes
N3663Q Beech
A36
Fixed-wing, single engine Individual owner
Colorado
Standard 2023-01-28 ValidFAA registration status code V: Valid registration. All codes
N3815K Beech
F33A
Fixed-wing, single engine Co-owned owner
Texas
Standard 2023-01-28 ValidFAA registration status code V: Valid registration. All codes
N185PK Cessna
A185F
Fixed-wing, single engine Sundance Holdings LLC
Webster, New York
Standard 2023-01-27 ValidFAA registration status code V: Valid registration. All codes
N499MB Beech
S35
Fixed-wing, single engine Co-owned owner
Tennessee
Standard 2023-01-27 ValidFAA registration status code V: Valid registration. All codes
N6169F Cessna
210J
Fixed-wing, single engine Individual owner
Minnesota
Standard 2023-01-27 ValidFAA registration status code V: Valid registration. All codes
N9511R Cessna
U206G
Fixed-wing, single engine Co-owned owner
Alaska
Standard 2023-01-27 ValidFAA registration status code V: Valid registration. All codes
N1033W Beech
V35B
Fixed-wing, single engine Punci Aviation II LLC
Port Washington, Wisconsin
Standard 2023-01-26 ValidFAA registration status code V: Valid registration. All codes
N58302 Cessna
185E
Fixed-wing, single engine Individual owner
Oregon
Standard 2023-01-26 ValidFAA registration status code V: Valid registration. All codes
N81640 Beech
F33A
Fixed-wing, single engine Individual owner
California
Standard 2023-01-26 ValidFAA registration status code V: Valid registration. All codes
N3227A Cessna
310R
Fixed-wing, multi-engine Boho LLC
Lewes, Delaware
Standard 2023-01-25 ValidFAA registration status code V: Valid registration. All codes
N7058N Beech
V35A
Fixed-wing, single engine Aeroplanes2 LLC
Indianola, Iowa
Standard 2023-01-25 ValidFAA registration status code V: Valid registration. All codes
N2797T Beech
V35
Fixed-wing, single engine D'Angelo Brothers Development LLC
Helena, Montana
Standard 2023-01-24 ValidFAA registration status code V: Valid registration. All codes
N3090P Beech
F33A
Fixed-wing, single engine Withheld at owner's request
Standard 2023-01-24 ValidFAA registration status code V: Valid registration. All codes
N3431L Cessna
U206B
Fixed-wing, single engine Individual owner
Washington
Standard 2023-01-24 ValidFAA registration status code V: Valid registration. All codes
N6CH Beech
58
Fixed-wing, multi-engine Individual owner
U.S. Virgin Islands
Standard 2023-01-24 ValidFAA registration status code V: Valid registration. All codes
N1791E Cessna
310R
Fixed-wing, multi-engine Sol Aerial Surveys LLC
Las Vegas, Nevada
Standard 2023-01-23 ValidFAA registration status code V: Valid registration. All codes
N4504S Beech
A36
Fixed-wing, single engine Withheld at owner's request
Standard 2023-01-22 ValidFAA registration status code V: Valid registration. All codes
N602LT Cessna
U206G
Fixed-wing, single engine Individual owner
Montana
Standard 2023-01-22 ValidFAA registration status code V: Valid registration. All codes
N1289R Bellanca
17-30A
Fixed-wing, single engine Individual owner
Minnesota
Standard 2023-01-21 ValidFAA registration status code V: Valid registration. All codes
N1892F Cessna
210F
Fixed-wing, single engine Individual owner
California
Standard 2023-01-21 ValidFAA registration status code V: Valid registration. All codes
N248D Beech
95-C55
Fixed-wing, multi-engine Devils Lake Aero Repair INC
Devils Lake, North Dakota
Standard 2023-01-21 ValidFAA registration status code V: Valid registration. All codes
N25633 Beech
V35B
Fixed-wing, single engine Co-owned owner
Oregon
Standard 2023-01-21 ValidFAA registration status code V: Valid registration. All codes
N414BA Cessna
414
Fixed-wing, multi-engine Optimal Health Systems LLC
Pima, Arizona
Standard 2023-01-21 ValidFAA registration status code V: Valid registration. All codes
N517KG Beech
V35B
Fixed-wing, single engine Individual owner
Tennessee
Standard 2023-01-20 ValidFAA registration status code V: Valid registration. All codes
N86TE Beech
V35B
Fixed-wing, single engine Individual owner
Michigan
Standard 2023-01-20 ValidFAA registration status code V: Valid registration. All codes
N8852M Beech
S35
Fixed-wing, single engine Andys Auto Sales LLC
Caroline, Wisconsin
Standard 2023-01-20 ValidFAA registration status code V: Valid registration. All codes
N8902U Beech
S35
Fixed-wing, single engine Co-owned owner
California
Standard 2023-01-20 ValidFAA registration status code V: Valid registration. All codes
N57TC Beech
V35A
Fixed-wing, single engine Niemi Aviation LLC
Glyndon, Minnesota
Standard 2023-01-19 ValidFAA registration status code V: Valid registration. All codes
N185BH Cessna
A185E
Fixed-wing, single engine Hawkins William G
Sheridan, Oregon
Standard 2023-01-18 ValidFAA registration status code V: Valid registration. All codes
N3206L Beech
V35B
Fixed-wing, single engine Alpha Tango LLC
Omaha, Nebraska
Standard 2023-01-18 ValidFAA registration status code V: Valid registration. All codes
N956SB Beech
E-55
Fixed-wing, multi-engine Beaux Air LLC
England, Arkansas
Standard 2023-01-18 ValidFAA registration status code V: Valid registration. All codes
N413GK Beech
V35B
Fixed-wing, single engine Kgc Holdings LTD
Newark, Texas
Standard 2023-01-17 ValidFAA registration status code V: Valid registration. All codes
N4457S Beech
V35B
Fixed-wing, single engine
Standard 2023-01-17 ValidFAA registration status code V: Valid registration. All codes
N4998U Cessna
210E
Fixed-wing, single engine Sixty Five Two Ten LLC
Oak Island, North Carolina
Standard 2023-01-17 ValidFAA registration status code V: Valid registration. All codes
N366HP Beech
A36
Fixed-wing, single engine Rey del Cielo LLC
San Antonio, Texas
Standard 2023-01-16 ValidFAA registration status code V: Valid registration. All codes
N46LE Beech
A36
Fixed-wing, single engine Kepley Aviation LLC
Smyrna, Tennessee
Standard 2023-01-16 ValidFAA registration status code V: Valid registration. All codes
N4943E Cessna
A185F
Fixed-wing, single engine Individual owner
Oklahoma
Standard 2023-01-16 ValidFAA registration status code V: Valid registration. All codes
N9136S Beech
A36
Fixed-wing, single engine Proctor Racing Group LLC
Glendora, California
Standard 2023-01-16 ValidFAA registration status code V: Valid registration. All codes
N3622A Beech
E-55
Fixed-wing, multi-engine Wing Bird Aviation LLC
Garland, Texas
Standard 2023-01-14 ValidFAA registration status code V: Valid registration. All codes
N4688A Beech
V35B
Fixed-wing, single engine Individual owner
Washington
Standard 2023-01-14 ValidFAA registration status code V: Valid registration. All codes
N732VR Cessna
210M
Fixed-wing, single engine Individual owner
Utah
Standard 2023-01-14 ValidFAA registration status code V: Valid registration. All codes
N93276 Cessna
A185F
Fixed-wing, single engine Individual owner
Alaska
Restricted 2023-01-14 ValidFAA registration status code V: Valid registration. All codes
N9498G Cessna
A188B
Fixed-wing, single engine Sak III LLC
Miller, South Dakota
Restricted 2023-01-14 ValidFAA registration status code V: Valid registration. All codes
N1062W Beech
A36
Fixed-wing, single engine Individual owner
Georgia
Standard 2023-01-13 ValidFAA registration status code V: Valid registration. All codes
N734EJ Cessna
U206G
Fixed-wing, single engine Individual owner
West Virginia
Standard 2023-01-13 ValidFAA registration status code V: Valid registration. All codes
N1809A Beech
A36
Fixed-wing, single engine Hi-Ho Air LLC
Wilmington, Delaware
Standard 2023-01-12 ValidFAA registration status code V: Valid registration. All codes
N305WB Cessna
P206B
Fixed-wing, single engine Cardinal Aviation LLC
Charles City, Virginia
Standard 2023-01-12 ValidFAA registration status code V: Valid registration. All codes
N410T Beech
F33A
Fixed-wing, single engine 410T LLC
Kennett Square, Pennsylvania
Standard 2023-01-12 ValidFAA registration status code V: Valid registration. All codes
N732DZ Cessna
210L
Fixed-wing, single engine Bbak Mik LLC
Ontario, Oregon
Standard 2023-01-12 ValidFAA registration status code V: Valid registration. All codes
N87199 Cessna
310R
Fixed-wing, multi-engine Co-owned owner
Virginia
Standard 2023-01-12 ValidFAA registration status code V: Valid registration. All codes
N9480Q Beech
F33A
Fixed-wing, single engine Individual owner
Utah
Standard 2023-01-12 ValidFAA registration status code V: Valid registration. All codes
N135DW Beech
V35B
Fixed-wing, single engine Individual owner
Indiana
Standard 2023-01-11 ValidFAA registration status code V: Valid registration. All codes
N1566L Beech
V35B
Fixed-wing, single engine Individual owner
California
Standard 2023-01-11 ValidFAA registration status code V: Valid registration. All codes
N3728A Beech
V35B
Fixed-wing, single engine Ac Bonanza LLC
Carrollton, Texas
Standard 2023-01-11 ValidFAA registration status code V: Valid registration. All codes
N37CH Beech
A36
Fixed-wing, single engine Dehaan Aviation LLC
Bethel, Alaska
Standard 2023-01-11 ValidFAA registration status code V: Valid registration. All codes
N5929S Beech
V35
Fixed-wing, single engine Individual owner
Oklahoma
Standard 2023-01-10 ValidFAA registration status code V: Valid registration. All codes
N713MA Cessna
TU206B
Fixed-wing, single engine Training Wheels & Advanced Technologies LLC
La Salle, Colorado
Standard 2023-01-09 ValidFAA registration status code V: Valid registration. All codes
N123CT Beech
V35
Fixed-wing, single engine Individual owner
California
Standard 2023-01-07 ValidFAA registration status code V: Valid registration. All codes
N2233T Cessna
A185E
Fixed-wing, single engine Seward Air Taxi LLC
Seward, Alaska
Standard 2023-01-07 ValidFAA registration status code V: Valid registration. All codes
N2980T Aero Commander
200D
Fixed-wing, single engine Individual owner
Texas
Standard 2023-01-07 ValidFAA registration status code V: Valid registration. All codes
N5912S Beech
V35A
Fixed-wing, single engine Top Hand Field Service LLC
Stillwater, Oklahoma
Standard 2023-01-06 ValidFAA registration status code V: Valid registration. All codes
N668DB Cessna
210L
Fixed-wing, single engine 686 Aviation LLC
Lakewood, Colorado
Standard 2023-01-06 ValidFAA registration status code V: Valid registration. All codes
N17840 Beech
V35B
Fixed-wing, single engine Es Investments LLC
Chandler, Arizona
Standard 2023-01-05 ValidFAA registration status code V: Valid registration. All codes
N5434U Beech
V35
Fixed-wing, single engine Individual owner
Oregon
Standard 2023-01-05 ValidFAA registration status code V: Valid registration. All codes
N6070S Beech
V35B
Fixed-wing, single engine Individual owner
Wisconsin
Standard 2023-01-05 ValidFAA registration status code V: Valid registration. All codes
N9153Q Beech
V35B
Fixed-wing, single engine Individual owner
California
Standard 2023-01-05 ValidFAA registration status code V: Valid registration. All codes
N1805R Beech
A36
Fixed-wing, single engine Flying Ventures LLC
Middletown, Delaware
Standard 2023-01-04 ValidFAA registration status code V: Valid registration. All codes
N46G Beech
F33A
Fixed-wing, single engine Individual owner
Colorado
Standard 2023-01-04 ValidFAA registration status code V: Valid registration. All codes
N7476P Beech
F33A
Fixed-wing, single engine Mobley Aviation LLC
The Colony, Texas
Standard 2023-01-04 ValidFAA registration status code V: Valid registration. All codes
N17656 Beech
V35B
Fixed-wing, single engine Individual owner
Montana
Standard 2023-01-03 ValidFAA registration status code V: Valid registration. All codes
N185MS Cessna
A185F
Fixed-wing, single engine Dragon Wagon LLC
Clackamas, Oregon
Standard 2023-01-03 ValidFAA registration status code V: Valid registration. All codes
N2481U Cessna
U206F
Fixed-wing, single engine Individual owner
Maine
Standard 2023-01-03 ValidFAA registration status code V: Valid registration. All codes
N11GX Cessna
310R
Fixed-wing, multi-engine Westrum Enterprises LLC
Norwalk, Iowa
Standard 2023-01-02 ValidFAA registration status code V: Valid registration. All codes
N1825R Cessna
A185F
Fixed-wing, single engine Individual owner
Alaska
Standard 2023-01-02 ValidFAA registration status code V: Valid registration. All codes
N1837L Beech
V35B
Fixed-wing, single engine Co-owned owner
North Carolina
Standard 2023-01-02 ValidFAA registration status code V: Valid registration. All codes
N21883 Cessna
A188B
Fixed-wing, single engine Stevenson Flying Service LLC
Selden, Kansas
Restricted 2023-01-02 ValidFAA registration status code V: Valid registration. All codes
N3762Q Beech
V35
Fixed-wing, single engine Co-owned owner
Arizona
Standard 2023-01-02 ValidFAA registration status code V: Valid registration. All codes
N731BM Cessna
A188B
Fixed-wing, single engine Benaiah Holdings CORP
Marion, Kentucky
Restricted 2023-01-02 ValidFAA registration status code V: Valid registration. All codes
N9485R Cessna
A188B
Fixed-wing, single engine Stevenson Flying Service LLC
Selden, Kansas
Restricted 2023-01-02 ValidFAA registration status code V: Valid registration. All codes
N185KT Cessna
A185F
Fixed-wing, single engine Lone Peak Air LLC
Gillette, Wyoming
Standard 2022-12-31 ValidFAA registration status code V: Valid registration. All codes
N29RF Beech
A36
Fixed-wing, single engine Individual owner
Kentucky
Standard 2022-12-31 ValidFAA registration status code V: Valid registration. All codes
N1546R Beech
F33A
Fixed-wing, single engine Individual owner
Ohio
Standard 2022-12-30 ValidFAA registration status code V: Valid registration. All codes
N41QC Beech
95-C55
Fixed-wing, multi-engine Individual owner
Louisiana
Standard 2022-12-30 ValidFAA registration status code V: Valid registration. All codes
N4764Q Cessna
A185E
Fixed-wing, single engine Individual owner
Alaska
Standard 2022-12-29 ValidFAA registration status code V: Valid registration. All codes
N158RF Beech
58
Fixed-wing, multi-engine Beech Bound LLC
Morgantown, West Virginia
Standard 2022-12-28 ValidFAA registration status code V: Valid registration. All codes
N1775R Cessna
A185F
Fixed-wing, single engine Individual owner
Alaska
Standard 2022-12-28 ValidFAA registration status code V: Valid registration. All codes
N230B Cessna
TU206A
Fixed-wing, single engine Individual owner
Georgia
Standard 2022-12-28 ValidFAA registration status code V: Valid registration. All codes
N8225M Cessna
210K
Fixed-wing, single engine Carlson Farms INC
Plentywood, Montana
Standard 2022-12-28 ValidFAA registration status code V: Valid registration. All codes
N2111Q Beech
36
Fixed-wing, single engine Individual owner
Colorado
Standard 2022-12-26 ValidFAA registration status code V: Valid registration. All codes
N3021W Beech
A36
Fixed-wing, single engine Individual owner
Nebraska
Standard 2022-12-26 ValidFAA registration status code V: Valid registration. All codes
N400HX Cessna
210D
Fixed-wing, single engine Individual owner
Colorado
Standard 2022-12-26 ValidFAA registration status code V: Valid registration. All codes
N62JB Beech
A36
Fixed-wing, single engine Hcb Media LLC
Los Angeles, California
Standard 2022-12-26 ValidFAA registration status code V: Valid registration. All codes
N9JF Beech
A36
Fixed-wing, single engine Individual owner
Tennessee
Standard 2022-12-26 ValidFAA registration status code V: Valid registration. All codes
N122RH Bellanca
17-30A
Fixed-wing, single engine Individual owner
New Jersey
Standard 2022-12-24 ValidFAA registration status code V: Valid registration. All codes
N5469V Beech
V35
Fixed-wing, single engine Individual owner
Texas
Standard 2022-12-24 ValidFAA registration status code V: Valid registration. All codes
N68310 Cessna
310R
Fixed-wing, multi-engine Redcell Air INC
Miami, Florida
Standard 2022-12-24 ValidFAA registration status code V: Valid registration. All codes
N9934Z Cessna
U206G
Fixed-wing, single engine Paragon Air Group
Fort Worth, Texas
Standard 2022-12-24 ValidFAA registration status code V: Valid registration. All codes
N113TB Cessna
A185F
Fixed-wing, single engine Individual owner
New York
Standard 2022-12-22 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.