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
N7445N Cessna
182P
Fixed-wing, single engine Skyplane Pilots LLC
Bluffton, South Carolina
Standard 2021-11-29 ValidFAA registration status code V: Valid registration. All codes
N81CL Beech
58
Fixed-wing, multi-engine Individual owner
Virginia
Standard 2021-11-29 ValidFAA registration status code V: Valid registration. All codes
N111GK Beech
F33A
Fixed-wing, single engine Mg Equipment CORP
Hauppauge, New York
Standard 2021-11-23 ValidFAA registration status code V: Valid registration. All codes
N9072S Beech
A36
Fixed-wing, single engine Saddleback Enterprises LLC
Newport Beach, California
Standard 2021-11-23 ValidFAA registration status code V: Valid registration. All codes
N154BC Cessna
210J
Fixed-wing, single engine Ten Knot Tailwind LLC
Mesa, Arizona
Standard 2021-11-22 ValidFAA registration status code V: Valid registration. All codes
N185MP Cessna
A185E
Fixed-wing, single engine Individual owner
Nevada
Standard 2021-11-22 ValidFAA registration status code V: Valid registration. All codes
N425MG Beech
S35
Fixed-wing, single engine Individual owner
Virginia
Standard 2021-11-20 ValidFAA registration status code V: Valid registration. All codes
N91CE Bellanca
17-30
Fixed-wing, single engine Co-owned owner
New York
Standard 2021-11-20 ValidFAA registration status code V: Valid registration. All codes
N700BT Beech
V35
Fixed-wing, single engine Individual owner
Colorado
Standard 2021-11-19 ValidFAA registration status code V: Valid registration. All codes
N2758T Beech
95-C55
Fixed-wing, multi-engine Individual owner
Massachusetts
Standard 2021-11-18 ValidFAA registration status code V: Valid registration. All codes
N81HB Beech
A36
Fixed-wing, single engine Co-owned owner
Kansas
Standard 2021-11-18 ValidFAA registration status code V: Valid registration. All codes
N4507F Cessna
A185E
Fixed-wing, single engine Individual owner
Washington
Standard 2021-11-17 ValidFAA registration status code V: Valid registration. All codes
N56511 Cessna
A185F
Fixed-wing, single engine Wired Flight LLC
Kent, Washington
Standard 2021-11-17 ValidFAA registration status code V: Valid registration. All codes
N708NC Cessna
310R
Fixed-wing, multi-engine Gaylord Hangars LLC
Hagerstown, Maryland
Standard 2021-11-17 ValidFAA registration status code V: Valid registration. All codes
N726AG Beech
F33A
Fixed-wing, single engine Two Tails LLC
Las Vegas, Nevada
Standard 2021-11-17 ValidFAA registration status code V: Valid registration. All codes
N6HQ Cessna
U206A
Fixed-wing, single engine Individual owner
Florida
Standard 2021-11-16 ValidFAA registration status code V: Valid registration. All codes
N761JB Beech
36
Fixed-wing, single engine Schwechten Physician Services Pllc
New Waverly, Texas
Standard 2021-11-16 ValidFAA registration status code V: Valid registration. All codes
N1030W Beech
V35B
Fixed-wing, single engine Individual owner
North Carolina
Standard 2021-11-15 ValidFAA registration status code V: Valid registration. All codes
N7540N Beech
E33A
Fixed-wing, single engine Madison Fasteners LLC
Hanover, Indiana
Standard 2021-11-15 ValidFAA registration status code V: Valid registration. All codes
N2157S Cessna
210L
Fixed-wing, single engine Co-owned owner
Texas
Standard 2021-11-12 ValidFAA registration status code V: Valid registration. All codes
N76AG Cessna
A188B
Fixed-wing, single engine Skyview Applicators LLC
Hartington, Nebraska
Restricted 2021-11-10 ValidFAA registration status code V: Valid registration. All codes
N4728M Beech
A36
Fixed-wing, single engine Individual owner
Arizona
Standard 2021-11-09 ValidFAA registration status code V: Valid registration. All codes
N7359V Bellanca
17-30
Fixed-wing, single engine Individual owner
South Dakota
Standard 2021-11-09 ValidFAA registration status code V: Valid registration. All codes
N8281Q Cessna
U206F
Fixed-wing, single engine 9 North LLC
Parker, Colorado
Standard 2021-11-06 ValidFAA registration status code V: Valid registration. All codes
N536TC Beech
B36TC
Fixed-wing, single engine I C Aviation LLC
Scottsdale, Arizona
Standard 2021-11-05 ValidFAA registration status code V: Valid registration. All codes
N100TX Beech
V35B
Fixed-wing, single engine Individual owner
Louisiana
Standard 2021-11-04 ValidFAA registration status code V: Valid registration. All codes
N2335F Cessna
210E
Fixed-wing, single engine Gravitte Peter F
Napa, California
Standard 2021-11-04 ValidFAA registration status code V: Valid registration. All codes
N4AA Cessna
A185F
Fixed-wing, single engine Asi Jet AG LLC
Hutchinson, Minnesota
Standard 2021-11-04 ValidFAA registration status code V: Valid registration. All codes
N53QM Beech
95-C55
Fixed-wing, multi-engine Wings Enterprizes LTD CO
Yukon, Oklahoma
Standard 2021-11-04 ValidFAA registration status code V: Valid registration. All codes
N55DB Beech
D55
Fixed-wing, multi-engine Individual owner
Nevada
Standard 2021-11-04 ValidFAA registration status code V: Valid registration. All codes
N56AK Cessna
U206G
Fixed-wing, single engine Longhorn Leasing LLC
Anchorage, Alaska
Standard 2021-11-04 ValidFAA registration status code V: Valid registration. All codes
N625KW Cessna
U206F
Fixed-wing, single engine Individual owner
Minnesota
Standard 2021-11-04 ValidFAA registration status code V: Valid registration. All codes
N6601N Beech
F33A
Fixed-wing, single engine Individual owner
California
Standard 2021-11-03 ValidFAA registration status code V: Valid registration. All codes
N303N Beech
A36
Fixed-wing, single engine Co-owned owner
Tennessee
Standard 2021-11-01 ValidFAA registration status code V: Valid registration. All codes
N3056W Beech
F33A
Fixed-wing, single engine Co-owned owner
Pennsylvania
Standard 2021-11-01 ValidFAA registration status code V: Valid registration. All codes
N484JR Beech
35-C33A
Fixed-wing, single engine C L Farwell Holdings III LLC
Brookline, New Hampshire
Standard 2021-11-01 ValidFAA registration status code V: Valid registration. All codes
N787LL Beech
F33A
Fixed-wing, single engine Douglas Aviation LTD
South Barrington, Illinois
Standard 2021-11-01 ValidFAA registration status code V: Valid registration. All codes
N832H Beech
A36
Fixed-wing, single engine Co-owned owner
California
Standard 2021-11-01 ValidFAA registration status code V: Valid registration. All codes
N9461S Beech
V35
Fixed-wing, single engine Co-owned owner
Missouri
Standard 2021-11-01 ValidFAA registration status code V: Valid registration. All codes
N167N Beech
95-C55
Fixed-wing, multi-engine Individual owner
California
Standard 2021-10-30 ValidFAA registration status code V: Valid registration. All codes
N45VC Cessna
210D
Fixed-wing, single engine Co-owned owner
Florida
Standard 2021-10-30 ValidFAA registration status code V: Valid registration. All codes
N512AT Cessna
210L
Fixed-wing, single engine Ranch Aero LLC
Sterling City, Texas
Standard 2021-10-30 ValidFAA registration status code V: Valid registration. All codes
N572T Beech
S35
Fixed-wing, single engine Individual owner
Virginia
Standard 2021-10-30 ValidFAA registration status code V: Valid registration. All codes
N3096T Beech
F33A
Fixed-wing, single engine Individual owner
California
Standard 2021-10-29 ValidFAA registration status code V: Valid registration. All codes
N309DC Beech
V35B
Fixed-wing, single engine Individual owner
Texas
Standard 2021-10-29 ValidFAA registration status code V: Valid registration. All codes
N4880V Bellanca
17-30
Fixed-wing, single engine Village Motors INC
Lake Village, Indiana
Standard 2021-10-28 ValidFAA registration status code V: Valid registration. All codes
N8046Z Cessna
U206A
Fixed-wing, single engine Best Auto Sales LLC
Plummer, Idaho
Standard 2021-10-28 ValidFAA registration status code V: Valid registration. All codes
N2357F Cessna
210E
Fixed-wing, single engine Individual owner
Virginia
Standard 2021-10-27 ValidFAA registration status code V: Valid registration. All codes
N6733Y Beech
F33A
Fixed-wing, single engine Individual owner
New York
Standard 2021-10-27 ValidFAA registration status code V: Valid registration. All codes
N8459N Beech
V35A
Fixed-wing, single engine Contrail LLC
Deerfield Beach, Florida
Standard 2021-10-27 ValidFAA registration status code V: Valid registration. All codes
N104K Cessna
207
Fixed-wing, single engine Jb Aircraft LLC
Anchorage, Alaska
Standard 2021-10-26 ValidFAA registration status code V: Valid registration. All codes
N37237 Cessna
310R
Fixed-wing, multi-engine Hudson Bay Holdings LLC
Lebanon, Tennessee
Standard 2021-10-26 ValidFAA registration status code V: Valid registration. All codes
N427LL Beech
F33A
Fixed-wing, single engine Co-owned owner
Michigan
Standard 2021-10-26 ValidFAA registration status code V: Valid registration. All codes
N747BG Beech
35-C33A
Fixed-wing, single engine Individual owner
Pennsylvania
Standard 2021-10-26 ValidFAA registration status code V: Valid registration. All codes
N2976T Aero Commander
200D
Fixed-wing, single engine Individual owner
Nebraska
Standard 2021-10-23 ValidFAA registration status code V: Valid registration. All codes
N59JB Beech
A36
Fixed-wing, single engine Aero Buelo LLC
Jasper, Texas
Standard 2021-10-22 ValidFAA registration status code V: Valid registration. All codes
N20HM Beech
A36
Fixed-wing, single engine Individual owner
Colorado
Standard 2021-10-21 ValidFAA registration status code V: Valid registration. All codes
N310CB Cessna
310R
Fixed-wing, multi-engine N310Cb LLC
Buford, Georgia
Standard 2021-10-21 ValidFAA registration status code V: Valid registration. All codes
N14687 Bellanca
17-30A
Fixed-wing, single engine Dalessio Enterprises INC
Smithville, Tennessee
Standard 2021-10-20 ValidFAA registration status code V: Valid registration. All codes
N333BG Cessna
A185F
Fixed-wing, single engine Individual owner
Florida
Standard 2021-10-20 ValidFAA registration status code V: Valid registration. All codes
N1926U Cessna
U206F
Fixed-wing, single engine Individual owner
Alaska
Standard 2021-10-19 ValidFAA registration status code V: Valid registration. All codes
N7268R Beech
E-55
Fixed-wing, multi-engine Rural-Em Consulting INC
Dallas, Texas
Standard 2021-10-19 ValidFAA registration status code V: Valid registration. All codes
N39806 Bellanca
17-30A
Fixed-wing, single engine Individual owner
Colorado
Standard 2021-10-18 ValidFAA registration status code V: Valid registration. All codes
N785JB Beech
V35A
Fixed-wing, single engine Fuller Aire INC
Wilmington, Delaware
Standard 2021-10-18 ValidFAA registration status code V: Valid registration. All codes
N9725R Cessna
U206G
Fixed-wing, single engine Longitude 150 LLC
Anchorage, Alaska
Standard 2021-10-18 ValidFAA registration status code V: Valid registration. All codes
N2045E Beech
A36
Fixed-wing, single engine Double P Investments LLC
Kerrville, Texas
Standard 2021-10-16 ValidFAA registration status code V: Valid registration. All codes
N3807E Beech
A36
Fixed-wing, single engine Individual owner
Texas
Standard 2021-10-16 ValidFAA registration status code V: Valid registration. All codes
N3855G Cessna
U206B
Fixed-wing, single engine Individual owner
Texas
Standard 2021-10-14 ValidFAA registration status code V: Valid registration. All codes
N185D Cessna
A185F
Fixed-wing, single engine Individual owner
Montana
Standard 2021-10-13 ValidFAA registration status code V: Valid registration. All codes
N732XX Cessna
210M
Fixed-wing, single engine Co-owned owner
Texas
Standard 2021-10-13 ValidFAA registration status code V: Valid registration. All codes
N7878Y Beech
F33A
Fixed-wing, single engine Individual owner
Illinois
Standard 2021-10-13 ValidFAA registration status code V: Valid registration. All codes
N5749K Beech
S35
Fixed-wing, single engine Base To Final LLC
Mesa, Arizona
Standard 2021-10-08 ValidFAA registration status code V: Valid registration. All codes
N5571C Beech
F33A
Fixed-wing, single engine Individual owner
Missouri
Standard 2021-10-07 ValidFAA registration status code V: Valid registration. All codes
N4258C Cessna
310R
Fixed-wing, multi-engine Sonrise Aviation LLC
Portland, Indiana
Standard 2021-10-06 ValidFAA registration status code V: Valid registration. All codes
N1297G Cessna
310R
Fixed-wing, multi-engine Pilot Mountain Aviation LLC
Marietta, Ohio
Standard 2021-10-05 ValidFAA registration status code V: Valid registration. All codes
N4872J Beech
35-C33A
Fixed-wing, single engine Am Aviation LLC
Edmonds, Washington
Standard 2021-10-05 ValidFAA registration status code V: Valid registration. All codes
N18369 Beech
V35B
Fixed-wing, single engine Individual owner
California
Standard 2021-10-04 ValidFAA registration status code V: Valid registration. All codes
N4924U Cessna
210E
Fixed-wing, single engine Individual owner
Vermont
Standard 2021-10-04 ValidFAA registration status code V: Valid registration. All codes
N4HH Beech
V35
Fixed-wing, single engine Individual owner
Arizona
Standard 2021-10-04 ValidFAA registration status code V: Valid registration. All codes
N4923C Cessna
A185F
Fixed-wing, single engine Individual owner
Alaska
Standard 2021-10-01 ValidFAA registration status code V: Valid registration. All codes
N707L Beech
V35A
Fixed-wing, single engine Individual owner
Montana
Standard 2021-10-01 ValidFAA registration status code V: Valid registration. All codes
N9110Q Beech
V35B
Fixed-wing, single engine Zen Air LLC
Kalispell, Montana
Standard 2021-10-01 ValidFAA registration status code V: Valid registration. All codes
N9257Q Beech
A36
Fixed-wing, single engine C9 Aero LLC
Gothenburg, Nebraska
Standard 2021-10-01 ValidFAA registration status code V: Valid registration. All codes
N23682 Beech
A36
Fixed-wing, single engine Next Century Aviation Oregon LLC
Sausalito, California
Standard 2021-09-30 ValidFAA registration status code V: Valid registration. All codes
N428TL Beech
V35A
Fixed-wing, single engine Joe Rushing Plumbing CO INC
Lubbock, Texas
Standard 2021-09-30 ValidFAA registration status code V: Valid registration. All codes
N876T Beech
S35
Fixed-wing, single engine Highrider LLC
Humble, Texas
Standard 2021-09-30 ValidFAA registration status code V: Valid registration. All codes
N2501S Cessna
T210L
Fixed-wing, single engine Individual owner
Texas
Standard 2021-09-29 ValidFAA registration status code V: Valid registration. All codes
N5618K Beech
S35
Fixed-wing, single engine Individual owner
Delaware
Standard 2021-09-29 ValidFAA registration status code V: Valid registration. All codes
N30VM Beech
F33A
Fixed-wing, single engine Individual owner
New York
Standard 2021-09-28 ValidFAA registration status code V: Valid registration. All codes
N5336C Cessna
310R
Fixed-wing, multi-engine Miller Aviation LLC
Huntington, Indiana
Standard 2021-09-27 ValidFAA registration status code V: Valid registration. All codes
N4515M Beech
F33A
Fixed-wing, single engine Individual owner
Arizona
Standard 2021-09-24 ValidFAA registration status code V: Valid registration. All codes
N1063W Beech
A36
Fixed-wing, single engine Dakota Land LLC
Simms, Montana
Standard 2021-09-23 ValidFAA registration status code V: Valid registration. All codes
N572E Cessna
A185E
Fixed-wing, single engine Echo Air LLC
Anchorage, Alaska
Multiple 2021-09-23 ValidFAA registration status code V: Valid registration. All codes
N581E Beech
58
Fixed-wing, multi-engine Co-owned owner
Wyoming
Standard 2021-09-23 ValidFAA registration status code V: Valid registration. All codes
N66863 Beech
A36
Fixed-wing, single engine Individual owner
Kansas
Standard 2021-09-23 ValidFAA registration status code V: Valid registration. All codes
N8391N Beech
D55
Fixed-wing, multi-engine Wolfpack Division LLC
Phoenix, Arizona
Standard 2021-09-23 ValidFAA registration status code V: Valid registration. All codes
N114TP Beech
V35B
Fixed-wing, single engine Grj LLC
Lexington, South Carolina
Standard 2021-09-22 ValidFAA registration status code V: Valid registration. All codes
N432AB Beech
F33A
Fixed-wing, single engine Wisco Flyers LLC
Middleton, Wisconsin
Standard 2021-09-22 ValidFAA registration status code V: Valid registration. All codes
N7874J Cessna
210L
Fixed-wing, single engine 2F Trade LLC
Collinsville, Texas
Standard 2021-09-21 ValidFAA registration status code V: Valid registration. All codes
N1597L Beech
F33A
Fixed-wing, single engine Individual owner
Maryland
Standard 2021-09-17 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.