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
N176Y Cessna
U206F
Fixed-wing, single engine Cessna U206F Aviation LLC
Boise, Idaho
Standard 2022-10-24 ValidFAA registration status code V: Valid registration. All codes
N310SL Cessna
310R
Fixed-wing, multi-engine 336 Investments LLC
Sumrall, Mississippi
Standard 2022-10-24 ValidFAA registration status code V: Valid registration. All codes
N6142C Cessna
310R
Fixed-wing, multi-engine Kite Harris Property Group LLC
Zionsville, Indiana
Standard 2022-10-24 ValidFAA registration status code V: Valid registration. All codes
N69610 Cessna
310R
Fixed-wing, multi-engine Airplane Planet 2 LLC
Dayton, Ohio
Standard 2022-10-24 ValidFAA registration status code V: Valid registration. All codes
N80069 Cessna
A185F
Fixed-wing, single engine Individual owner
Alaska
Standard 2022-10-24 ValidFAA registration status code V: Valid registration. All codes
N79MC Beech
A36
Fixed-wing, single engine Kruse Air LLC
Sheridan, Wyoming
Standard 2022-10-22 ValidFAA registration status code V: Valid registration. All codes
N9483S Beech
35-C33A
Fixed-wing, single engine Advanced Flight Systems INC
Canby, Oregon
Experimental 2022-10-22 ValidFAA registration status code V: Valid registration. All codes
N35677 Cessna
210L
Fixed-wing, single engine C3 Indutries LLC
Bakersfield, California
Standard 2022-10-21 ValidFAA registration status code V: Valid registration. All codes
N3877Y Cessna
210D
Fixed-wing, single engine Gonzo LLC
La Junta, Colorado
Standard 2022-10-21 ValidFAA registration status code V: Valid registration. All codes
N934ZB Beech
95-C55
Fixed-wing, multi-engine Anduze Helicopter LLC
Royal Palm Beach, Florida
Standard 2022-10-21 ValidFAA registration status code V: Valid registration. All codes
N1635W Beech
A36
Fixed-wing, single engine Co-owned owner
Oklahoma
Standard 2022-10-20 ValidFAA registration status code V: Valid registration. All codes
N185VG Cessna
A185F
Fixed-wing, single engine Individual owner
New Mexico
Standard 2022-10-20 ValidFAA registration status code V: Valid registration. All codes
N401AE Beech
A36
Fixed-wing, single engine Individual owner
Louisiana
Standard 2022-10-20 ValidFAA registration status code V: Valid registration. All codes
N5710V Beech
V35
Fixed-wing, single engine Individual owner
California
Standard 2022-10-19 ValidFAA registration status code V: Valid registration. All codes
N756DK Cessna
U206G
Fixed-wing, single engine Individual owner
California
Standard 2022-10-19 ValidFAA registration status code V: Valid registration. All codes
N7817R Beech
D55
Fixed-wing, multi-engine Individual owner
Tennessee
Standard 2022-10-19 ValidFAA registration status code V: Valid registration. All codes
N826T Beech
V35B
Fixed-wing, single engine Bonanza H35 LLC
Greensboro, North Carolina
Standard 2022-10-19 ValidFAA registration status code V: Valid registration. All codes
N880CA Beech
E-55
Fixed-wing, multi-engine Nspace LLC
Spicewood, Texas
Standard 2022-10-19 ValidFAA registration status code V: Valid registration. All codes
N112DK Beech
F33A
Fixed-wing, single engine Individual owner
Tennessee
Standard 2022-10-18 ValidFAA registration status code V: Valid registration. All codes
N4804J Beech
35-C33A
Fixed-wing, single engine Individual owner
Missouri
Standard 2022-10-18 ValidFAA registration status code V: Valid registration. All codes
N6833T Cessna
310R
Fixed-wing, multi-engine Individual owner
Louisiana
Standard 2022-10-18 ValidFAA registration status code V: Valid registration. All codes
N39863 Bellanca
17-30A
Fixed-wing, single engine Individual owner
Georgia
Standard 2022-10-17 ValidFAA registration status code V: Valid registration. All codes
N9518Q Beech
V35
Fixed-wing, single engine Individual owner
North Dakota
Standard 2022-10-17 ValidFAA registration status code V: Valid registration. All codes
N624BC Cessna
T337D
Fixed-wing, multi-engine Individual owner
Utah
Standard 2022-10-15 ValidFAA registration status code V: Valid registration. All codes
N8840V Bellanca
17-30A
Fixed-wing, single engine N8840V LLC
Longmont, Colorado
Standard 2022-10-15 ValidFAA registration status code V: Valid registration. All codes
N3837Y Cessna
210D
Fixed-wing, single engine Individual owner
Texas
Standard 2022-10-14 ValidFAA registration status code V: Valid registration. All codes
N4280Q Cessna
A185F
Fixed-wing, single engine Co-owned owner
New York
Standard 2022-10-14 ValidFAA registration status code V: Valid registration. All codes
N5033J Cessna
310R
Fixed-wing, multi-engine Sol Aerial Surveys LLC
Las Vegas, Nevada
Standard 2022-10-14 ValidFAA registration status code V: Valid registration. All codes
N764 Cessna
U206F
Fixed-wing, single engine Usda Forest Servic Fepp
Columbia, South Carolina
Standard 2022-10-14 ValidFAA registration status code V: Valid registration. All codes
N168NL Beech
35-C33A
Fixed-wing, single engine Lakeside Views LLC
La Crescenta, California
Standard 2022-10-13 ValidFAA registration status code V: Valid registration. All codes
N20478 Beech
V35B
Fixed-wing, single engine V35B Bonanza LLC
Temecula, California
Standard 2022-10-13 ValidFAA registration status code V: Valid registration. All codes
N79VK Cessna
210N
Fixed-wing, single engine 3G'S Aviation LLC
St Simons Island, Georgia
Standard 2022-10-13 ValidFAA registration status code V: Valid registration. All codes
N5920S Beech
V35
Fixed-wing, single engine Individual owner
Washington
Standard 2022-10-12 ValidFAA registration status code V: Valid registration. All codes
N1047F Cessna
A185F
Fixed-wing, single engine Individual owner
Alaska
Standard 2022-10-11 ValidFAA registration status code V: Valid registration. All codes
N1802F Cessna
210E
Fixed-wing, single engine Individual owner
Georgia
Standard 2022-10-11 ValidFAA registration status code V: Valid registration. All codes
N7542D Beech
E-55
Fixed-wing, multi-engine Beach Bound Baron LLC
Modena, New York
Standard 2022-10-08 ValidFAA registration status code V: Valid registration. All codes
N92RH Cessna
P206C
Fixed-wing, single engine Individual owner
Oklahoma
Standard 2022-10-08 ValidFAA registration status code V: Valid registration. All codes
N6652V Bellanca
17-30
Fixed-wing, single engine Co-owned owner
South Dakota
Standard 2022-10-07 ValidFAA registration status code V: Valid registration. All codes
N616ST Cessna
414A
Fixed-wing, multi-engine K&S Flights LLC
Sweet Valley, Pennsylvania
Standard 2022-10-06 ValidFAA registration status code V: Valid registration. All codes
N66907 Beech
V35B
Fixed-wing, single engine Individual owner
Texas
Standard 2022-10-06 ValidFAA registration status code V: Valid registration. All codes
N76DB Beech
F33A
Fixed-wing, single engine Aek Property 6 LLC
Glendale, Arizona
Standard 2022-10-06 ValidFAA registration status code V: Valid registration. All codes
N4625M Beech
A36
Fixed-wing, single engine Individual owner
California
Standard 2022-10-04 ValidFAA registration status code V: Valid registration. All codes
N5657K Beech
S35
Fixed-wing, single engine Co-owned owner
Washington
Standard 2022-10-01 ValidFAA registration status code V: Valid registration. All codes
N6037M Beech
58
Fixed-wing, multi-engine Raleigh Flying Club LLC
Chapel Hill, North Carolina
Standard 2022-10-01 ValidFAA registration status code V: Valid registration. All codes
N506DR Cessna
310R
Fixed-wing, multi-engine Sol Aerial Surveys LLC
Las Vegas, Nevada
Standard 2022-09-30 ValidFAA registration status code V: Valid registration. All codes
N5571D Beech
F33A
Fixed-wing, single engine Individual owner
Vermont
Standard 2022-09-29 ValidFAA registration status code V: Valid registration. All codes
N131TW Beech
E-55
Fixed-wing, multi-engine Baron N131Tw LLC
Wilmette, Illinois
Standard 2022-09-28 ValidFAA registration status code V: Valid registration. All codes
N14729 Bellanca
17-30A
Fixed-wing, single engine Individual owner
Texas
Standard 2022-09-28 ValidFAA registration status code V: Valid registration. All codes
N212GW Beech
D55
Fixed-wing, multi-engine Tim D Wilson Investigations INC
Hempstead, Texas
Standard 2022-09-28 ValidFAA registration status code V: Valid registration. All codes
N534F Cessna
T210F
Fixed-wing, single engine Individual owner
Pennsylvania
Standard 2022-09-28 ValidFAA registration status code V: Valid registration. All codes
N732VG Cessna
210M
Fixed-wing, single engine Crystal Air LLC
Onida, South Dakota
Standard 2022-09-28 ValidFAA registration status code V: Valid registration. All codes
N4175S Beech
V35B
Fixed-wing, single engine Individual owner
North Carolina
Standard 2022-09-27 ValidFAA registration status code V: Valid registration. All codes
N74WM Beech
58
Fixed-wing, multi-engine Individual owner
Texas
Standard 2022-09-27 ValidFAA registration status code V: Valid registration. All codes
N24161 Beech
V35B
Fixed-wing, single engine Diamond Scenery LLC
Red Oak, Texas
Standard 2022-09-24 ValidFAA registration status code V: Valid registration. All codes
N3076T Beech
F33A
Fixed-wing, single engine Point Two Six Avation LLC
Scottsdale, Arizona
Standard 2022-09-24 ValidFAA registration status code V: Valid registration. All codes
N5495J Cessna
310R
Fixed-wing, multi-engine Mesquite Express LLC
Waco, Texas
Standard 2022-09-24 ValidFAA registration status code V: Valid registration. All codes
N4638E Cessna
A185F
Fixed-wing, single engine Co-owned owner
Ohio
Standard 2022-09-23 ValidFAA registration status code V: Valid registration. All codes
N23DL Beech
S35
Fixed-wing, single engine Individual owner
Louisiana
Standard 2022-09-22 ValidFAA registration status code V: Valid registration. All codes
N3336S Cessna
210J
Fixed-wing, single engine Co-owned owner
Texas
Standard 2022-09-22 ValidFAA registration status code V: Valid registration. All codes
N80256 Cessna
A185F
Fixed-wing, single engine Dew Farms INC
Ulysses, Kansas
Standard 2022-09-22 ValidFAA registration status code V: Valid registration. All codes
N3146W Beech
F33A
Fixed-wing, single engine Individual owner
Pennsylvania
Standard 2022-09-21 ValidFAA registration status code V: Valid registration. All codes
N495GC Beech
A36
Fixed-wing, single engine Individual owner
Illinois
Standard 2022-09-21 ValidFAA registration status code V: Valid registration. All codes
N3747Y Cessna
210D
Fixed-wing, single engine Centurion Aviation Nevada LLC
Sparks, Nevada
Standard 2022-09-20 ValidFAA registration status code V: Valid registration. All codes
N10BP Beech
V35B
Fixed-wing, single engine Individual owner
Colorado
Standard 2022-09-19 ValidFAA registration status code V: Valid registration. All codes
N3321C Beech
A36
Fixed-wing, single engine Aviation Management II LLC
Des Moines, Iowa
Standard 2022-09-19 ValidFAA registration status code V: Valid registration. All codes
N8055U Beech
F33A
Fixed-wing, single engine Individual owner
Texas
Standard 2022-09-17 ValidFAA registration status code V: Valid registration. All codes
N7094N Beech
E33A
Fixed-wing, single engine Individual owner
Tennessee
Standard 2022-09-16 ValidFAA registration status code V: Valid registration. All codes
N28166 Bellanca
17-30A
Fixed-wing, single engine Individual owner
Texas
Standard 2022-09-14 ValidFAA registration status code V: Valid registration. All codes
N58PB Beech
58
Fixed-wing, multi-engine Direct Flight LLC
Kitty Hawk, North Carolina
Standard 2022-09-14 ValidFAA registration status code V: Valid registration. All codes
N94077 Cessna
210L
Fixed-wing, single engine Milky Way LLC
Fresno, California
Standard 2022-09-14 ValidFAA registration status code V: Valid registration. All codes
N8815M Beech
S35
Fixed-wing, single engine Individual owner
Pennsylvania
Standard 2022-09-13 ValidFAA registration status code V: Valid registration. All codes
N17732 Beech
E-55
Fixed-wing, multi-engine Individual owner
Tennessee
Standard 2022-09-12 ValidFAA registration status code V: Valid registration. All codes
N2848W Beech
V35B
Fixed-wing, single engine Individual owner
Wyoming
Standard 2022-09-12 ValidFAA registration status code V: Valid registration. All codes
N171RM Cessna
U206F
Fixed-wing, single engine Co-owned owner
Virginia
Standard 2022-09-10 ValidFAA registration status code V: Valid registration. All codes
N8081E Cessna
A185F
Fixed-wing, single engine Flying Horseman Ranch LLC
Stuart, Virginia
Standard 2022-09-10 ValidFAA registration status code V: Valid registration. All codes
N942V Beech
A36
Fixed-wing, single engine Endeavor Enterprises LLC
Alta Loma, California
Standard 2022-09-10 ValidFAA registration status code V: Valid registration. All codes
N12KC Beech
S35
Fixed-wing, single engine Individual owner
Arizona
Standard 2022-09-09 ValidFAA registration status code V: Valid registration. All codes
N355WB Beech
95-C55
Fixed-wing, multi-engine White River Aviation LLC
Midway, Arkansas
Standard 2022-09-09 ValidFAA registration status code V: Valid registration. All codes
N373LE Bellanca
17-30A
Fixed-wing, single engine Individual owner
Texas
Standard 2022-09-09 ValidFAA registration status code V: Valid registration. All codes
N654SC Beech
F33A
Fixed-wing, single engine Lewis Aviation INC
Wilmington, Delaware
Standard 2022-09-09 ValidFAA registration status code V: Valid registration. All codes
N7883L Beech
V35
Fixed-wing, single engine Individual owner
North Carolina
Standard 2022-09-08 ValidFAA registration status code V: Valid registration. All codes
N4203S Beech
A36
Fixed-wing, single engine Individual owner
Texas
Standard 2022-09-07 ValidFAA registration status code V: Valid registration. All codes
N5937S Beech
V35
Fixed-wing, single engine Co-owned owner
Idaho
Standard 2022-09-07 ValidFAA registration status code V: Valid registration. All codes
N17CC Beech
V35B
Fixed-wing, single engine Co-owned owner
California
Standard 2022-09-06 ValidFAA registration status code V: Valid registration. All codes
N3815P Beech
A36
Fixed-wing, single engine North Louisiana Aviation LLC
Mer Rouge, Louisiana
Standard 2022-09-06 ValidFAA registration status code V: Valid registration. All codes
N185RP Cessna
A185F
Fixed-wing, single engine Individual owner
Alaska
Standard 2022-09-03 ValidFAA registration status code V: Valid registration. All codes
N9139Q Beech
A36
Fixed-wing, single engine Bollings Avionics LLC
Bristol, Tennessee
Standard 2022-09-03 ValidFAA registration status code V: Valid registration. All codes
N186VB Beech
58
Fixed-wing, multi-engine Latb LLC
Lewes, Delaware
Standard 2022-09-02 ValidFAA registration status code V: Valid registration. All codes
N8DP Beech
58
Fixed-wing, multi-engine Delta Papa Aviation LLC
Wilmington, Delaware
Multiple 2022-09-02 ValidFAA registration status code V: Valid registration. All codes
N7583C Beech
35-C33A
Fixed-wing, single engine Individual owner
California
Standard 2022-09-01 ValidFAA registration status code V: Valid registration. All codes
N8250R Beech
F33A
Fixed-wing, single engine M O S T Express
Franklin, Tennessee
Standard 2022-09-01 ValidFAA registration status code V: Valid registration. All codes
N5127U Cessna
206
Fixed-wing, single engine Individual owner
Washington
Standard 2022-08-31 ValidFAA registration status code V: Valid registration. All codes
N9171G Cessna
A188B
Fixed-wing, single engine Kiehl Flying Service LLC
Winnett, Montana
Restricted 2022-08-31 ValidFAA registration status code V: Valid registration. All codes
N3880Y Cessna
210D
Fixed-wing, single engine Lake Country Aviation LLC
Milledgeville, Georgia
Standard 2022-08-30 ValidFAA registration status code V: Valid registration. All codes
N677Z Beech
95-C55
Fixed-wing, multi-engine Individual owner
California
Standard 2022-08-30 ValidFAA registration status code V: Valid registration. All codes
N100NN Beech
V35B
Fixed-wing, single engine Dunnair LLC
Panama City, Florida
Standard 2022-08-29 ValidFAA registration status code V: Valid registration. All codes
N9440Q Beech
V35B
Fixed-wing, single engine Individual owner
Massachusetts
Standard 2022-08-27 ValidFAA registration status code V: Valid registration. All codes
N4726U Cessna
U206G
Fixed-wing, single engine Monogram Aviation Services LLC
Coeur D Alene, Idaho
Standard 2022-08-26 ValidFAA registration status code V: Valid registration. All codes
N745T Beech
E-55
Fixed-wing, multi-engine Co-owned owner
Texas
Special flight permit 2022-08-26 ValidFAA registration status code V: Valid registration. All codes
N815AC Cessna
310R
Fixed-wing, multi-engine Individual owner
Wisconsin
Standard 2022-08-26 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.