The U.S. aircraft register, updated daily
Engines · piston (reciprocating) · data as of October 8, 2026

Lycoming IO-360-L2A

2,634 aircraft on the U.S. register carry a Lycoming IO-360-L2A engine, rated at about 180 horsepower. The Cessna 172 Skyhawk is the model most often fitted with it (2,621 aircraft). The aircraft carrying it were built between 1999 and 2026.

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 Lycoming IO-360-L2A. FAA spelling: IO-360-L2A.

Fitted to model families

Cessna 172 Skyhawk2,621Amador Frank Donny AVID ACFT MAGNUM1Avila Edward V RV-91Charles A Garton VANS RV-141Darley Vern VANS RV-6A1Dimeo Robert RV81Hatler Donald W GLASTAR1Herr Francis B RV-7A1Huisman Wim J VELOCITY 173 FIXED1Jeremy D Mumford DR-1071Konrad Gary T VANS RV-71Kurtz Garold RV41
Model families, as a table
aircraft
Cessna 172 Skyhawk2,621
Amador Frank Donny AVID ACFT MAGNUM1
Avila Edward V RV-91
Charles A Garton VANS RV-141
Darley Vern VANS RV-6A1
Dimeo Robert RV81
Hatler Donald W GLASTAR1
Herr Francis B RV-7A1
Huisman Wim J VELOCITY 173 FIXED1
Jeremy D Mumford DR-1071
Konrad Gary T VANS RV-71
Kurtz Garold RV41

Cessna 172 Skyhawk · Amador Frank Donny AVID ACFT MAGNUM · Avila Edward V RV-9 · Charles A Garton VANS RV-14 · Darley Vern VANS RV-6A · Dimeo Robert RV8 · Hatler Donald W GLASTAR · Herr Francis B RV-7A · Huisman Wim J VELOCITY 173 FIXED · Jeremy D Mumford DR-107

Kind of aircraft

By kind, as a table
aircraftshare
Piston singles2,634100%

When the aircraft were built by decade

By decade built, as a table
aircraft
199027
20001,110
2010548
2020895

What the FAA has certified, ordered and been told about the Lycoming IO-360-L2A the component layer

The design is held under 1 type certificate (1E10, held by Lycoming Engines). The FAA has issued 26 airworthiness directives (orders that owners must comply with) that name this engine series. Operators and repair shops have filed 992 failure reports with the FAA since 1995, 219 of them in the last ten years.

FAA orders 26 airworthiness directives · newest first

2026-04-082026-04-11 · Engine (Reciprocating) · engine
2024-12-052024-21-02 · Engine (Reciprocating) · engine
2021-01-152020-25-12 · Reciprocating Engine Power Section · engine
2017-08-152017-16-11 · Reciprocating Engine Power Section · engine
2015-11-032015-19-07 · Fuel injector fuel lines · engine
2012-10-242012-19-01 · Crankshafts · engine

All orders naming the Lycoming IO-360-L2A

Failure reports 992 since · what operators and shops told the FAA

0224467899803081318232326
Failure reports by year, as a table
reports
9812
9975
0034
0127
0227
0389
0439
0533
0638
0736
0829
0941
1063
1130
1230
1331
1446
1535
1658
1727
1819
1929
2017
218
2214
2336
2416
2530
2623

Parts most often reported as the reports name them

Control Cable83Impulse Coupling43Engine40Fuel Control38Servo34Bulkhead33Pushrod33Starter33Magneto31Cylinder30
Parts most reported, as a table
reports
Control Cable83
Impulse Coupling43
Engine40
Fuel Control38
Servo34
Bulkhead33
Pushrod33
Starter33
Magneto31
Cylinder30

Latest reports

2026-09-21Propeller: misinstalled
2026-09-05Seal: failed
2026-08-04Pump: failed
2026-06-15Cylinder: cracked
2026-05-15Shutoff Valve: leaking

Certificates and bulletins

1E10Type certificate held by Lycoming Engines · 89 models listed · revised May 4, 2020

Safety bulletins 6 · advice, not orders

2019-05-02NE-19-08 · Reciprocating Engine Cylinder Section - Lycoming Engines Parallel Valve Cylinders
2016-05-13NE-08-32R1 · Propeller Governor Idler Gear Shaft Set Screw
2014-03-24NE-14-13 · Reciprocating Engine - Cylinder Mounting Studs
2012-11-21NE-13-06 · Pushrod Shroud Spring Retainers, Engine Components Part No. AEL14995, for Lycoming Engines 320,...
2008-09-10NE-06-32R1 · Reciprocating Engine - Crankshaft

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

The whole map of how records connect · these connections as data: /graph/engine/lycoming-io-360-l2a.json.

Aircraft newest certificates first · 2,634

Tail no.Maker and modelGroupOwner and baseCertificateRegisteredStatus
N5224G Cessna
172S
Fixed-wing, single engine Bank of Utah Trustee
Salt Lake City, Utah
Standard 2017-05-24 ValidFAA registration status code V: Valid registration. All codes
N962LT Textron Aviation Inc
172S
Fixed-wing, single engine University of la System DBA
Ruston, Louisiana
Standard 2017-05-23 ValidFAA registration status code V: Valid registration. All codes
N966LT Textron Aviation Inc
172S
Fixed-wing, single engine University of la System DBA
Ruston, Louisiana
Standard 2017-05-23 ValidFAA registration status code V: Valid registration. All codes
N385KL Cessna
172S
Fixed-wing, single engine Iasco Flight Training INC
Redding, California
Standard 2017-05-22 ValidFAA registration status code V: Valid registration. All codes
N961LT Textron Aviation Inc
172S
Fixed-wing, single engine University of la System DBA
Ruston, Louisiana
Standard 2017-05-22 ValidFAA registration status code V: Valid registration. All codes
N964LT Textron Aviation Inc
172S
Fixed-wing, single engine University of la System DBA
Ruston, Louisiana
Standard 2017-05-22 ValidFAA registration status code V: Valid registration. All codes
N965LT Textron Aviation Inc
172S
Fixed-wing, single engine University of la System DBA
Ruston, Louisiana
Standard 2017-05-22 ValidFAA registration status code V: Valid registration. All codes
N172AV Cessna
172S
Fixed-wing, single engine Flight Training Aircraft LLC
Wilmington, Delaware
Standard 2017-05-10 ValidFAA registration status code V: Valid registration. All codes
N126BS Textron Aviation Inc
172S
Fixed-wing, single engine Cape Island Aviation LLC
Millville, New Jersey
Standard 2017-05-04 ValidFAA registration status code V: Valid registration. All codes
N35077 Cessna
172R
Fixed-wing, single engine Individual owner
Puerto Rico
Standard 2017-05-04 ValidFAA registration status code V: Valid registration. All codes
N115FJ Cessna
172S
Fixed-wing, single engine Fargo Jet Center LLC
Fargo, North Dakota
Standard 2017-04-24 ValidFAA registration status code V: Valid registration. All codes
N217EP Textron Aviation Inc
172S
Fixed-wing, single engine Epic Aviation INC
New Smyrna Beach, Florida
Standard 2017-04-20 ValidFAA registration status code V: Valid registration. All codes
N172TG Cessna
172S
Fixed-wing, single engine Maya Air Services LLC
Lee, New Hampshire
Standard 2017-04-19 ValidFAA registration status code V: Valid registration. All codes
N551ND Cessna
172S
Fixed-wing, single engine Coast Flight Training and Management INC
San Diego, California
Standard 2017-04-17 ValidFAA registration status code V: Valid registration. All codes
N566ND Cessna
172S
Fixed-wing, single engine Coast Flight Training and Management INC
San Diego, California
Standard 2017-04-17 ValidFAA registration status code V: Valid registration. All codes
N401LP Cessna
172S
Fixed-wing, single engine Mustang Sally Aviation LLC
Camden, South Carolina
Standard 2017-03-30 ValidFAA registration status code V: Valid registration. All codes
N1408B Cessna
172S
Fixed-wing, single engine Iasco Flight Training INC
Redding, California
Standard 2017-03-28 ValidFAA registration status code V: Valid registration. All codes
N512ND Cessna
172S
Fixed-wing, single engine Coast Flight Training and Management INC
San Diego, California
Standard 2017-03-27 ValidFAA registration status code V: Valid registration. All codes
N2336V Cessna
172S
Fixed-wing, single engine W Tech Consulting INC
Wilmington, Delaware
Standard 2017-03-21 ValidFAA registration status code V: Valid registration. All codes
N815CT Cessna
172R
Fixed-wing, single engine Coast Flight Training and Management INC
San Diego, California
Standard 2017-02-28 ValidFAA registration status code V: Valid registration. All codes
N35389 Cessna
172S
Fixed-wing, single engine Individual owner
Arizona
Standard 2017-02-07 ValidFAA registration status code V: Valid registration. All codes
N511ND Cessna
172S
Fixed-wing, single engine Sunrise Aviation INC
Ormond Beach, Florida
Standard 2017-02-06 ValidFAA registration status code V: Valid registration. All codes
N516ND Cessna
172S
Fixed-wing, single engine Sunrise Aviation INC
Ormond Beach, Florida
Standard 2017-02-06 ValidFAA registration status code V: Valid registration. All codes
N5219V Cessna
172S
Fixed-wing, single engine Skymates INC
Wilmington, Delaware
Standard 2017-02-06 ValidFAA registration status code V: Valid registration. All codes
N2225F Cessna Aircraft Co
172S
Fixed-wing, single engine Textron Aviation INC
Wichita, Kansas
Experimental 2017-02-03 ValidFAA registration status code V: Valid registration. All codes
N21662 Cessna
172S
Fixed-wing, single engine Individual owner
Texas
Standard 2017-01-31 ValidFAA registration status code V: Valid registration. All codes
N5138V Cessna
172S
Fixed-wing, single engine Advanced Charter & Instruction LLC
Costa Mesa, California
Standard 2017-01-31 ValidFAA registration status code V: Valid registration. All codes
N13312 Cessna
172S
Fixed-wing, single engine 13312 LLC
Union Gap, Washington
Standard 2017-01-27 ValidFAA registration status code V: Valid registration. All codes
N1947L Textron Aviation Inc
172S
Fixed-wing, single engine Cal Aggie Flying Farmers
Davis, California
Standard 2017-01-20 ValidFAA registration status code V: Valid registration. All codes
N2152S Cessna
172S
Fixed-wing, single engine Moore Aviation INC
Beaver Falls, Pennsylvania
Standard 2017-01-19 ValidFAA registration status code V: Valid registration. All codes
N1306M Cessna
172S
Fixed-wing, single engine Freedom Aviation INC
Lynchburg, Virginia
Standard 2017-01-18 ValidFAA registration status code V: Valid registration. All codes
N427KR Cessna
172S
Fixed-wing, single engine Individual owner
California
Standard 2017-01-17 ValidFAA registration status code V: Valid registration. All codes
N5195Y Cessna
172S
Fixed-wing, single engine Urbana Aircraft LLC
Urbana, Maryland
Standard 2017-01-12 ValidFAA registration status code V: Valid registration. All codes
N1672C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2017-01-10 ValidFAA registration status code V: Valid registration. All codes
N1673C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2017-01-10 ValidFAA registration status code V: Valid registration. All codes
N1676C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2017-01-10 ValidFAA registration status code V: Valid registration. All codes
N1678C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2017-01-10 ValidFAA registration status code V: Valid registration. All codes
N1683C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2017-01-10 ValidFAA registration status code V: Valid registration. All codes
N1651C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2016-12-28 ValidFAA registration status code V: Valid registration. All codes
N1658C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2016-12-28 ValidFAA registration status code V: Valid registration. All codes
N1664C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2016-12-28 ValidFAA registration status code V: Valid registration. All codes
N1668C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2016-12-28 ValidFAA registration status code V: Valid registration. All codes
N1671C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2016-12-28 ValidFAA registration status code V: Valid registration. All codes
N268CT Cessna
172R
Fixed-wing, single engine Coast Flight Training and Management INC
San Diego, California
Standard 2016-12-22 ValidFAA registration status code V: Valid registration. All codes
N512CT Cessna
172R
Fixed-wing, single engine Coast Flight Training and Management INC
San Diego, California
Standard 2016-12-22 ValidFAA registration status code V: Valid registration. All codes
N2225A Cessna
172S
Fixed-wing, single engine Freedom Aviation INC
Lynchburg, Virginia
Standard 2016-12-14 ValidFAA registration status code V: Valid registration. All codes
N983FA Cessna
172S
Fixed-wing, single engine Freedom Aviation INC
Lynchburg, Virginia
Standard 2016-12-14 ValidFAA registration status code V: Valid registration. All codes
N123GG Cessna
172S
Fixed-wing, single engine 150Th Aero Flying Club
Morristown, New Jersey
Standard 2016-12-13 ValidFAA registration status code V: Valid registration. All codes
N1641C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2016-12-12 ValidFAA registration status code V: Valid registration. All codes
N1643C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2016-12-12 ValidFAA registration status code V: Valid registration. All codes
N1646C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2016-12-12 ValidFAA registration status code V: Valid registration. All codes
N1687C Textron Aviation Inc
172S
Fixed-wing, single engine Ce-172 Aircraft LLC
Wilmington, Delaware
Standard 2016-12-12 ValidFAA registration status code V: Valid registration. All codes
N172FR Cessna
172S
Fixed-wing, single engine Hetrick Air Services INC
Lawrence, Kansas
Standard 2016-12-09 ValidFAA registration status code V: Valid registration. All codes
N5275W Cessna
172S
Fixed-wing, single engine Mustang Sally Aviation LLC
Camden, South Carolina
Standard 2016-11-16 ValidFAA registration status code V: Valid registration. All codes
N660JW Cessna
172S
Fixed-wing, single engine Learning 2 Fly LLC
Cave Creek, Arizona
Standard 2016-11-08 ValidFAA registration status code V: Valid registration. All codes
N6028Y Cessna
172S
Fixed-wing, single engine Puerto Rico Aircraft Leasing CORP
Ceiba, Puerto Rico
Standard 2016-11-07 ValidFAA registration status code V: Valid registration. All codes
N1154G Cessna
172S
Fixed-wing, single engine Plane Nonsense INC
Middletown, Delaware
Standard 2016-11-04 ValidFAA registration status code V: Valid registration. All codes
N541KS Textron Aviation Inc
172S
Fixed-wing, single engine Kent State University
Stow, Ohio
Standard 2016-11-02 ValidFAA registration status code V: Valid registration. All codes
N714LU Textron Aviation Inc
172S
Fixed-wing, single engine Liberty University INC
Lynchburg, Virginia
Standard 2016-11-02 ValidFAA registration status code V: Valid registration. All codes
N715LU Textron Aviation Inc
172S
Fixed-wing, single engine Liberty University INC
Lynchburg, Virginia
Standard 2016-11-02 ValidFAA registration status code V: Valid registration. All codes
N444VW Textron Aviation Inc
172S
Fixed-wing, single engine N444Vw LLC
Union Gap, Washington
Standard 2016-11-01 ValidFAA registration status code V: Valid registration. All codes
N560TH Textron Aviation Inc
172S
Fixed-wing, single engine Le Tourneau University
Longview, Texas
Standard 2016-11-01 ValidFAA registration status code V: Valid registration. All codes
N816SW Cessna
172S
Fixed-wing, single engine University of Alaska Anchorage
Anchorage, Alaska
Standard 2016-11-01 ValidFAA registration status code V: Valid registration. All codes
N959UA Cessna
172S
Fixed-wing, single engine University of Alaska Anchorage
Anchorage, Alaska
Standard 2016-11-01 ValidFAA registration status code V: Valid registration. All codes
N26AA Textron Aviation Inc
172S
Fixed-wing, single engine Mustang Sally Aviation LLC
Camden, South Carolina
Standard 2016-10-31 ValidFAA registration status code V: Valid registration. All codes
N53AA Textron Aviation Inc
172S
Fixed-wing, single engine Mustang Sally Aviation LLC
Camden, South Carolina
Standard 2016-10-31 ValidFAA registration status code V: Valid registration. All codes
N409LP Cessna
172S
Fixed-wing, single engine Solberg Aviation CO INC
Whitehouse Station, New Jersey
Standard 2016-10-26 ValidFAA registration status code V: Valid registration. All codes
N1323X Cessna
172S
Fixed-wing, single engine Mustang Sally Aviation LLC
Camden, South Carolina
Standard 2016-10-20 ValidFAA registration status code V: Valid registration. All codes
N2157H Cessna
172S
Fixed-wing, single engine Mustang Sally Aviation LLC
Camden, South Carolina
Standard 2016-10-20 ValidFAA registration status code V: Valid registration. All codes
N2302Y Cessna
172S
Fixed-wing, single engine Mustang Sally Aviation LLC
Camden, South Carolina
Standard 2016-10-20 ValidFAA registration status code V: Valid registration. All codes
N636SA Cessna
172S
Fixed-wing, single engine Mustang Sally Aviation LLC
Camden, South Carolina
Standard 2016-10-20 ValidFAA registration status code V: Valid registration. All codes
N1318Q Cessna
172S
Fixed-wing, single engine Mustang Sally Aviation LLC
Camden, South Carolina
Standard 2016-10-19 ValidFAA registration status code V: Valid registration. All codes
N6185U Cessna
172S
Fixed-wing, single engine Mustang Sally Aviation LLC
Camden, South Carolina
Standard 2016-10-19 ValidFAA registration status code V: Valid registration. All codes
N6269Q Cessna
172S
Fixed-wing, single engine Mustang Sally Aviation LLC
Camden, South Carolina
Standard 2016-10-19 ValidFAA registration status code V: Valid registration. All codes
N223CK Cessna
172S
Fixed-wing, single engine Individual owner
Georgia
Standard 2016-10-18 ValidFAA registration status code V: Valid registration. All codes
N6208C Cessna
172S
Fixed-wing, single engine Mustang Sally Aviation LLC
Camden, South Carolina
Standard 2016-10-17 ValidFAA registration status code V: Valid registration. All codes
N77LU Cessna
172R
Fixed-wing, single engine German Farms INC
Fullerton, North Dakota
Standard 2016-10-14 ValidFAA registration status code V: Valid registration. All codes
N940RM Cessna
172S
Fixed-wing, single engine School of Missionary Aviation Technology
Ionia, Michigan
Standard 2016-10-05 ValidFAA registration status code V: Valid registration. All codes
N1089D Cessna
172S
Fixed-wing, single engine Heavy Metal Air LLC
Farmingdale, New York
Standard 2016-09-12 ValidFAA registration status code V: Valid registration. All codes
N13986 Cessna
172R
Fixed-wing, single engine Euro 2000 INC
Merritt Island, Florida
Standard 2016-09-07 ValidFAA registration status code V: Valid registration. All codes
N540KS Textron Aviation Inc
172S
Fixed-wing, single engine Kent State University
Stow, Ohio
Standard 2016-08-31 ValidFAA registration status code V: Valid registration. All codes
N698JA Cessna
172S
Fixed-wing, single engine Bon Bon Aviation LLC
Daly City, California
Standard 2016-08-26 ValidFAA registration status code V: Valid registration. All codes
N5256S Cessna
172S
Fixed-wing, single engine Fargo Jet Center LLC
Fargo, North Dakota
Standard 2016-08-18 ValidFAA registration status code V: Valid registration. All codes
N6342B Cessna
172S
Fixed-wing, single engine Fargo Jet Center LLC
Fargo, North Dakota
Standard 2016-08-18 ValidFAA registration status code V: Valid registration. All codes
N110SQ Cessna
172S
Fixed-wing, single engine Land Air & Sea LLC
Concord, North Carolina
Standard 2016-08-17 ValidFAA registration status code V: Valid registration. All codes
N2145J Cessna
172S
Fixed-wing, single engine School of Missionary Aviation Technology
Ionia, Michigan
Standard 2016-08-11 ValidFAA registration status code V: Valid registration. All codes
N562AE Cessna
172S
Fixed-wing, single engine L-Bird LLC
Hood River, Oregon
Standard 2016-08-11 ValidFAA registration status code V: Valid registration. All codes
N792MD Cessna
172S
Fixed-wing, single engine 150Th Aero Flying Club INC
Morristown, New Jersey
Standard 2016-07-26 ValidFAA registration status code V: Valid registration. All codes
N5306C Cessna
172S
Fixed-wing, single engine So Cal Leasing LLC
El Cajon, California
Standard 2016-07-25 ValidFAA registration status code V: Valid registration. All codes
N540CF Cessna
172S
Fixed-wing, single engine Certified Aviation LLC
Morristown, New Jersey
Standard 2016-07-22 ValidFAA registration status code V: Valid registration. All codes
N23557 Cessna
172S
Fixed-wing, single engine Flying Dutchman LLC
Wilmington, Delaware
Standard 2016-07-19 ValidFAA registration status code V: Valid registration. All codes
N441ER Cessna
172S
Fixed-wing, single engine Individual owner
Puerto Rico
Standard 2016-07-18 ValidFAA registration status code V: Valid registration. All codes
N1615A Cessna
172S
Fixed-wing, single engine Anson Air LLC
Sugar Land, Texas
Standard 2016-07-13 ValidFAA registration status code V: Valid registration. All codes
N533KS Cessna
172S
Fixed-wing, single engine Kent State University
Stow, Ohio
Standard 2016-07-11 ValidFAA registration status code V: Valid registration. All codes
N534KS Cessna
172S
Fixed-wing, single engine Kent State University
Stow, Ohio
Standard 2016-07-11 ValidFAA registration status code V: Valid registration. All codes
N473CS Textron Aviation Inc
172S
Fixed-wing, single engine Dae Aviation Enterprises CORP
Gilford, New Hampshire
Standard 2016-07-06 ValidFAA registration status code V: Valid registration. All codes
N1884M Cessna
172S
Fixed-wing, single engine Montgomery Aviation LLC
Zionsville, Indiana
Standard 2016-06-28 ValidFAA registration status code V: Valid registration. All codes
N11682 Cessna
172S
Fixed-wing, single engine Maya Aircraft Holdings LLC
Lee, New Hampshire
Standard 2016-06-23 ValidFAA registration status code V: Valid registration. All codes
N82ST Stumpf Blain E
VANS RV-8
Fixed-wing, single engine Stumpf Blain
Placerville, California
Experimental 2016-06-23 ValidFAA registration status code V: Valid registration. All codes
N61WT Cessna
172S
Fixed-wing, single engine Monmouth Area Flying Club INC
Lakewood, New Jersey
Standard 2016-06-16 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 8, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.