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
N125PC Beech
V35B
Fixed-wing, single engine Withheld at owner's request
Standard 2022-12-22 ValidFAA registration status code V: Valid registration. All codes
N310DA Cessna
310R
Fixed-wing, multi-engine Recycled Air LLC
Hoschton, Georgia
Standard 2022-12-22 ValidFAA registration status code V: Valid registration. All codes
N113V Beech
S35
Fixed-wing, single engine Individual owner
California
Standard 2022-12-20 ValidFAA registration status code V: Valid registration. All codes
N3173T Beech
F33A
Fixed-wing, single engine Air Tango LLC
Martinez, Georgia
Standard 2022-12-20 ValidFAA registration status code V: Valid registration. All codes
N7200N Beech
36
Fixed-wing, single engine Individual owner
Minnesota
Standard 2022-12-20 ValidFAA registration status code V: Valid registration. All codes
N9572G Cessna
U206F
Fixed-wing, single engine Individual owner
Alaska
Standard 2022-12-20 ValidFAA registration status code V: Valid registration. All codes
N208SS Cessna
A185F
Fixed-wing, single engine Seldom Seen Aviation Northwest INC
Stevensville, Montana
Standard 2022-12-19 ValidFAA registration status code V: Valid registration. All codes
N4149S Beech
V35B
Fixed-wing, single engine Co-owned owner
Florida
Standard 2022-12-19 ValidFAA registration status code V: Valid registration. All codes
N13BP Cessna
320D
Fixed-wing, multi-engine N13Bp LLC
Walla Walla, Washington
Standard 2022-12-17 ValidFAA registration status code V: Valid registration. All codes
N28LD Beech
V35B
Fixed-wing, single engine Dancing Bear LLC
Polson, Montana
Standard 2022-12-17 ValidFAA registration status code V: Valid registration. All codes
N3831G Cessna
U206B
Fixed-wing, single engine Individual owner
Louisiana
Standard 2022-12-17 ValidFAA registration status code V: Valid registration. All codes
N6115V Beech
S35
Fixed-wing, single engine Co-owned owner
California
Standard 2022-12-17 ValidFAA registration status code V: Valid registration. All codes
N747AQ Cessna
A185F
Fixed-wing, single engine Individual owner
Michigan
Standard 2022-12-17 ValidFAA registration status code V: Valid registration. All codes
N9500G Cessna
A188B
Fixed-wing, single engine Ephbaugm Equipment LLC
Hartline, Washington
Restricted 2022-12-17 ValidFAA registration status code V: Valid registration. All codes
N1624W Beech
F33A
Fixed-wing, single engine Co-owned owner
Texas
Standard 2022-12-15 ValidFAA registration status code V: Valid registration. All codes
N35MA Beech
V35A
Fixed-wing, single engine Sidetrack Investments LLC
Flower Mound, Texas
Standard 2022-12-15 ValidFAA registration status code V: Valid registration. All codes
N6JT Beech
A36
Fixed-wing, single engine Co-owned owner
Arizona
Experimental 2022-12-15 ValidFAA registration status code V: Valid registration. All codes
N761EX Cessna
210M
Fixed-wing, single engine Carolina Crafted Construction LLC
Greenville, South Carolina
Standard 2022-12-15 ValidFAA registration status code V: Valid registration. All codes
N2979T Aero Commander
200D
Fixed-wing, single engine Individual owner
Nevada
Standard 2022-12-14 ValidFAA registration status code V: Valid registration. All codes
N4855C Cessna
A185F
Fixed-wing, single engine Individual owner
Alaska
Standard 2022-12-14 ValidFAA registration status code V: Valid registration. All codes
N713PL Beech
D55
Fixed-wing, multi-engine Sbw Aircraft Group LLC
Lewes, Delaware
Standard 2022-12-14 ValidFAA registration status code V: Valid registration. All codes
N7732R Beech
E33C
Fixed-wing, single engine Aluzion LLC
Madison, Alabama
Standard 2022-12-14 ValidFAA registration status code V: Valid registration. All codes
N2552X Cessna
P206
Fixed-wing, single engine N2552X LLC
Boulder, Colorado
Standard 2022-12-13 ValidFAA registration status code V: Valid registration. All codes
N71KW Beech
A36
Fixed-wing, single engine Individual owner
North Carolina
Standard 2022-12-13 ValidFAA registration status code V: Valid registration. All codes
N1587U Cessna
207
Fixed-wing, single engine Grant Aviation INC
Anchorage, Alaska
Standard 2022-12-12 ValidFAA registration status code V: Valid registration. All codes
N1834Q Cessna
U206F
Fixed-wing, single engine Individual owner
Alaska
Standard 2022-12-12 ValidFAA registration status code V: Valid registration. All codes
N2W Cessna
A185F
Fixed-wing, single engine Seldom Seen Aviation Northwest INC
Stevensville, Montana
Standard 2022-12-12 ValidFAA registration status code V: Valid registration. All codes
N359P Beech
58
Fixed-wing, multi-engine Tilloo Aviation LLC
Pensacola, Florida
Standard 2022-12-12 ValidFAA registration status code V: Valid registration. All codes
N55YB Beech
95-C55
Fixed-wing, multi-engine Individual owner
Arizona
Standard 2022-12-12 ValidFAA registration status code V: Valid registration. All codes
N7960R Beech
E33A
Fixed-wing, single engine Mainline Aviation LLC
Paeonian Springs, Virginia
Standard 2022-12-10 ValidFAA registration status code V: Valid registration. All codes
N148U Beech
V35
Fixed-wing, single engine Individual owner
Washington
Standard 2022-12-09 ValidFAA registration status code V: Valid registration. All codes
N17747 Beech
F33A
Fixed-wing, single engine Davis 180 LLC
Baton Rouge, Louisiana
Standard 2022-12-09 ValidFAA registration status code V: Valid registration. All codes
N64Z Beech
A36
Fixed-wing, single engine Individual owner
California
Standard 2022-12-09 ValidFAA registration status code V: Valid registration. All codes
N1675W Beech
F33A
Fixed-wing, single engine Individual owner
California
Standard 2022-12-08 ValidFAA registration status code V: Valid registration. All codes
N17703 Beech
A36
Fixed-wing, single engine Dakota Aviation LLC
Sioux Falls, South Dakota
Standard 2022-12-07 ValidFAA registration status code V: Valid registration. All codes
N457JN Beech
V35B
Fixed-wing, single engine Toerner Investments
Findlay, Ohio
Standard 2022-12-07 ValidFAA registration status code V: Valid registration. All codes
N206JM Cessna
U206F
Fixed-wing, single engine Southside Truck and Trailers INC
San Antonio, Texas
Standard 2022-12-05 ValidFAA registration status code V: Valid registration. All codes
N2280R Cessna
T210J
Fixed-wing, single engine Individual owner
California
Standard 2022-12-05 ValidFAA registration status code V: Valid registration. All codes
N452SK Bellanca
17-30A
Fixed-wing, single engine Individual owner
Texas
Standard 2022-12-05 ValidFAA registration status code V: Valid registration. All codes
N4841R Cessna
A188B
Fixed-wing, single engine Black Gulch Aviation LLC
Polson, Montana
Restricted 2022-12-03 ValidFAA registration status code V: Valid registration. All codes
N501CR Bellanca
17-30A
Fixed-wing, single engine Co-owned owner
Arizona
Standard 2022-12-03 ValidFAA registration status code V: Valid registration. All codes
N8760Q Cessna
A185F
Fixed-wing, single engine Individual owner
Ohio
Standard 2022-12-03 ValidFAA registration status code V: Valid registration. All codes
N984BC Beech
58
Fixed-wing, multi-engine Withheld at owner's request
Standard 2022-12-03 ValidFAA registration status code V: Valid registration. All codes
N70RA Beech
S35
Fixed-wing, single engine Co-owned owner
Florida
Standard 2022-12-02 ValidFAA registration status code V: Valid registration. All codes
N366PS Beech
E-55
Fixed-wing, multi-engine A-Team Family LLC
Ashland, Oregon
Standard 2022-11-30 ValidFAA registration status code V: Valid registration. All codes
N9021V Beech
58
Fixed-wing, multi-engine 9021 LLC
Sheridan, Wyoming
Standard 2022-11-30 ValidFAA registration status code V: Valid registration. All codes
N9410S Beech
V35
Fixed-wing, single engine Individual owner
Arkansas
Standard 2022-11-30 ValidFAA registration status code V: Valid registration. All codes
N176X Beech
A36
Fixed-wing, single engine Club Turbo 176 LLC
Santa Clara, California
Standard 2022-11-29 ValidFAA registration status code V: Valid registration. All codes
N24194 Beech
A36
Fixed-wing, single engine Ge King LLC
Lewes, Delaware
Standard 2022-11-29 ValidFAA registration status code V: Valid registration. All codes
N5019J Cessna
310R
Fixed-wing, multi-engine Individual owner
Mississippi
Standard 2022-11-28 ValidFAA registration status code V: Valid registration. All codes
N5784K Beech
S35
Fixed-wing, single engine N5784K LLC
Kalispell, Montana
Standard 2022-11-28 ValidFAA registration status code V: Valid registration. All codes
N6668Q Beech
A36
Fixed-wing, single engine Withheld at owner's request
Standard 2022-11-28 ValidFAA registration status code V: Valid registration. All codes
N924RB Beech
A36
Fixed-wing, single engine Individual owner
Arizona
Standard 2022-11-28 ValidFAA registration status code V: Valid registration. All codes
N5896S Beech
S35
Fixed-wing, single engine Individual owner
New Jersey
Standard 2022-11-26 ValidFAA registration status code V: Valid registration. All codes
N7508Q Cessna
T310Q
Fixed-wing, multi-engine Zulu Hours LLC
Moneta, Virginia
Standard 2022-11-26 ValidFAA registration status code V: Valid registration. All codes
N1170T Beech
V35B
Fixed-wing, single engine Jf Capital Series LLC
Truckee, California
Standard 2022-11-25 ValidFAA registration status code V: Valid registration. All codes
N214RC Beech
S35
Fixed-wing, single engine Co-owned owner
Vermont
Standard 2022-11-25 ValidFAA registration status code V: Valid registration. All codes
N6147F Cessna
210H
Fixed-wing, single engine Co-owned owner
Tennessee
Standard 2022-11-25 ValidFAA registration status code V: Valid registration. All codes
N85BA Beech
V35A
Fixed-wing, single engine Individual owner
North Carolina
Standard 2022-11-25 ValidFAA registration status code V: Valid registration. All codes
N19KY Beech
E-55
Fixed-wing, multi-engine Individual owner
Colorado
Restricted 2022-11-24 ValidFAA registration status code V: Valid registration. All codes
N9166R Cessna
A188B
Fixed-wing, single engine Individual owner
Montana
Restricted 2022-11-24 ValidFAA registration status code V: Valid registration. All codes
N185JL Cessna
A185F
Fixed-wing, single engine Potomac Street Partners LLP
Centennial, Colorado
Standard 2022-11-22 ValidFAA registration status code V: Valid registration. All codes
N2598X Cessna
P206
Fixed-wing, single engine Individual owner
Pennsylvania
Standard 2022-11-21 ValidFAA registration status code V: Valid registration. All codes
N907AK Cessna
A185F
Fixed-wing, single engine Individual owner
Alaska
Multiple 2022-11-19 ValidFAA registration status code V: Valid registration. All codes
N3397G Cessna
310R
Fixed-wing, multi-engine Pro Aire Cargo & Consulting INC
Oshkosh, Wisconsin
Standard 2022-11-17 ValidFAA registration status code V: Valid registration. All codes
N4122K Piper
PA-32R-301
Fixed-wing, single engine Co-owned owner
Colorado
Standard 2022-11-17 ValidFAA registration status code V: Valid registration. All codes
N7448N Cessna
U206G
Fixed-wing, single engine Ccx-2000-0111 LLC
Garberville, California
Standard 2022-11-17 ValidFAA registration status code V: Valid registration. All codes
N185AV Cessna
A185F
Fixed-wing, single engine Remote Access Aviation LLC
Saint Albans, Vermont
Standard 2022-11-16 ValidFAA registration status code V: Valid registration. All codes
N792DM Beech
V35
Fixed-wing, single engine Dkl INC
Ardmore, Oklahoma
Standard 2022-11-16 ValidFAA registration status code V: Valid registration. All codes
N441WW Beech
F33A
Fixed-wing, single engine 4Kd Corporation
Wilmington, Delaware
Standard 2022-11-15 ValidFAA registration status code V: Valid registration. All codes
N4786F Cessna
TP206C
Fixed-wing, single engine Individual owner
North Carolina
Standard 2022-11-15 ValidFAA registration status code V: Valid registration. All codes
N8066Z Cessna
U206A
Fixed-wing, single engine Individual owner
Utah
Standard 2022-11-15 ValidFAA registration status code V: Valid registration. All codes
N158BJ Beech
58
Fixed-wing, multi-engine Perfectus INC
Wilmington, Delaware
Standard 2022-11-14 ValidFAA registration status code V: Valid registration. All codes
N414W Cessna
414
Fixed-wing, multi-engine On Top Aviation LLC
North Las Vegas, Nevada
Standard 2022-11-11 ValidFAA registration status code V: Valid registration. All codes
N713J Beech
95-C55
Fixed-wing, multi-engine Kelly Dent LLC
Wilmington, Delaware
Multiple 2022-11-11 ValidFAA registration status code V: Valid registration. All codes
N711X Beech
S35
Fixed-wing, single engine Veetail LLC
Land O Lakes, Florida
Standard 2022-11-10 ValidFAA registration status code V: Valid registration. All codes
N101BM Beech
E-55
Fixed-wing, multi-engine Individual owner
Texas
Standard 2022-11-09 ValidFAA registration status code V: Valid registration. All codes
N8463N Beech
V35A
Fixed-wing, single engine Dc Executive Aviation LLC
Spring, Texas
Standard 2022-11-07 ValidFAA registration status code V: Valid registration. All codes
N67DS Cessna
A185E
Fixed-wing, single engine Hangar 39 LLC
Culpeper, Virginia
Standard 2022-11-05 ValidFAA registration status code V: Valid registration. All codes
N93055 Cessna
A185F
Fixed-wing, single engine Individual owner
Alaska
Multiple 2022-11-05 ValidFAA registration status code V: Valid registration. All codes
N9533H Cessna
A185F
Fixed-wing, single engine Individual owner
Montana
Standard 2022-11-05 ValidFAA registration status code V: Valid registration. All codes
N4637A Beech
V35B
Fixed-wing, single engine Lucky Dog Air LLC
Edmond, Oklahoma
Standard 2022-11-04 ValidFAA registration status code V: Valid registration. All codes
N8046G Beech
F33A
Fixed-wing, single engine Individual owner
Texas
Standard 2022-11-04 ValidFAA registration status code V: Valid registration. All codes
N111WW Beech
A36
Fixed-wing, single engine Individual owner
Texas
Standard 2022-11-03 ValidFAA registration status code V: Valid registration. All codes
N36AS Beech
A36
Fixed-wing, single engine Moore Brothers Company INC
Staunton, Virginia
Standard 2022-11-03 ValidFAA registration status code V: Valid registration. All codes
N5712J Cessna
P206E
Fixed-wing, single engine Free Air LLC
Helena, Montana
Standard 2022-11-03 ValidFAA registration status code V: Valid registration. All codes
N5186U Cessna
206
Fixed-wing, single engine Co-owned owner
Montana
Standard 2022-11-02 ValidFAA registration status code V: Valid registration. All codes
N8242T Beech
F33A
Fixed-wing, single engine N8242T LLC
Phoenix, Arizona
Standard 2022-11-02 ValidFAA registration status code V: Valid registration. All codes
N8268T Beech
F33A
Fixed-wing, single engine N8268T LLC
Phoenix, Arizona
Standard 2022-11-02 ValidFAA registration status code V: Valid registration. All codes
N8633M Beech
S35
Fixed-wing, single engine Individual owner
Texas
Standard 2022-11-02 ValidFAA registration status code V: Valid registration. All codes
N4188S Beech
58
Fixed-wing, multi-engine Major Air LLC
Charleston, South Carolina
Standard 2022-11-01 ValidFAA registration status code V: Valid registration. All codes
N479SV Bellanca
17-30A
Fixed-wing, single engine Co-owned owner
Ohio
Standard 2022-11-01 ValidFAA registration status code V: Valid registration. All codes
N770P Beech
A36
Fixed-wing, single engine Individual owner
California
Standard 2022-11-01 ValidFAA registration status code V: Valid registration. All codes
N12JG Cessna
P210N
Fixed-wing, single engine Vosworx Aviation LLC
Morrison, Colorado
Standard 2022-10-31 ValidFAA registration status code V: Valid registration. All codes
N6385H Bellanca
17-30
Fixed-wing, single engine Eds Used Machinery LLC
Memphis, Missouri
Standard 2022-10-29 ValidFAA registration status code V: Valid registration. All codes
N7224L Beech
F33A
Fixed-wing, single engine Co-owned owner
Texas
Standard 2022-10-29 ValidFAA registration status code V: Valid registration. All codes
N7921M Beech
V35
Fixed-wing, single engine Individual owner
Tennessee
Standard 2022-10-29 ValidFAA registration status code V: Valid registration. All codes
N4365V Bellanca
17-30A
Fixed-wing, single engine Individual owner
Arizona
Standard 2022-10-27 ValidFAA registration status code V: Valid registration. All codes
N727MS Beech
A36
Fixed-wing, single engine Redd Aviation LLC
Elk City, Oklahoma
Standard 2022-10-26 ValidFAA registration status code V: Valid registration. All codes
N4506C Cessna
A185F
Fixed-wing, single engine Iliamna Copper River Fly Fishing Lodge LLC
Livingston, Montana
Standard 2022-10-25 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.