Lycoming AEIO-540-D4A5
55 aircraft on the U.S. register carry a Lycoming AEIO-540-D4A5 engine, rated at about 260 horsepower. The Aviat Aircraft Inc S-2 is the model most often fitted with it (7 aircraft). The aircraft carrying it were built between 1979 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 AEIO-540-D4A5. FAA spelling: AEIO-540-D4A5.
Fitted to model families
Aviat Aircraft Inc S-27Aviat Aircraft Inc PITTS S-2C4Aviat Inc PITTS S-2B4Pitts Aerobatics S-24Slingsby Aviation Ltd SLINGSBY T67M2604Aerotek PITTS S2S3Siai-Marchetti F.260C3Slingsby T673Christen Industries Inc PITTS S-2B2Mxr Technologies Inc MXS2Pitts S-22Aerobatic Aircraft Texas Inc PITTS S2S1
Aviat Aircraft Inc S-2 · Aviat Aircraft Inc PITTS S-2C · Aviat Inc PITTS S-2B · Pitts Aerobatics S-2 · Slingsby Aviation Ltd SLINGSBY T67M260 · Aerotek PITTS S2S · Siai-Marchetti F.260C · Slingsby T67 · Christen Industries Inc PITTS S-2B · Mxr Technologies Inc MXS
Where they are owner's state
Florida6California6Texas5Georgia5Wyoming2Washington2Virginia2Tennessee2Maine2Delaware2
Kind of aircraft
Piston singles55 (100%)
When the aircraft were built by decade
What the FAA has certified, ordered and been told about the Lycoming AEIO-540-D4A5 the component layer
The design is held under 1 type certificate (1E4, held by Lycoming Engines). The FAA has issued 29 airworthiness directives (orders that owners must comply with) that name this engine series. Operators and repair shops have filed 61 failure reports with the FAA since 1995, 11 of them in the last ten years.
FAA orders 29 airworthiness directives · newest first
2026-04-082026-04-11 · Engine (Reciprocating) · engine
2024-12-052024-21-02 · Engine (Reciprocating) · engine
2017-08-152017-16-11 · Reciprocating Engine Power Section · engine
2015-11-032015-19-07 · Fuel injector fuel lines · engine
2015-03-112015-02-07 · Propeller governor shaft set screw · engine
2012-10-242012-19-01 · Crankshafts · engine
Failure reports 61 since · what operators and shops told the FAA
Parts most often reported as the reports name them
Pump10Baffle4Engine4Flange3Handle3Rod2Shock Mount2Valve2Actuator1Aileron1
Latest reports
2015-05-03Control Tube: damaged
2012-05-25Pitot Tube: contaminated
2011-11-28Control Rod: gouged
2011-10-21Fork: cracked
2011-09-20Hose: worn
Certificates and bulletins
1E4Type certificate held by Lycoming Engines · 81 models listed · revised February 28, 2018
Safety bulletins 5 · 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
2008-09-10NE-06-32R1 · Reciprocating Engine - Crankshaft
2008-07-03NE-08-32 · Propeller Governor Set Screw
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
- Aviat Aircraft Inc S-2 7 with this engine series
- Aviat Inc PITTS S-2B 4 with this engine series
- Pitts Aerobatics S-2 4 with this engine series
- Slingsby Aviation Ltd SLINGSBY T67M260 4 with this engine series
- Aerotek PITTS S2S 3 with this engine series
- Siai-Marchetti F.260C 3 with this engine series
- Slingsby T67 3 with this engine series
- Christen Industries Inc PITTS S-2B 2 with this engine series
Where they are
- Florida 6 of these aircraft
- California 6 of these aircraft
- Texas 5 of these aircraft
- Georgia 5 of these aircraft
- Wyoming 2 of these aircraft
Biggest operators
- Southern Aircraft Consultancy INC Trustee 2 of these aircraft
- Eastern Stearman INC Trustee 2 of these aircraft
Airworthiness
- FAA orders naming the Lycoming AEIO-540-D4A5 29 airworthiness directives
- Failure reports on the Lycoming AEIO-540-D4A5 61 reports since 1995
Analytics
These connections as data: /graph/engine/lycoming-aeio-540-d4a5.json · about the eFlight graph.
Aircraft newest certificates first · 55
| Tail no. | Maker and model | Group | Owner and base | Certificate | Registered | Status |
|---|---|---|---|---|---|---|
| N260MJ | Pitts Aerobatics S-2B |
Fixed-wing, single engine | Stoked Aero LLC Camas, Washington |
Standard | 2026-05-18 | ValidFAA registration status code V: Valid registration. All codes |
| N540XS | Mxr Technologies Inc MXS |
Fixed-wing, single engine | Southern Aircraft Consultancy INC Trustee Casper, Wyoming |
Experimental | 2026-02-19 | ValidFAA registration status code V: Valid registration. All codes |
| N260BN | Christen Industries Inc S-2B |
Fixed-wing, single engine | Southern Aircraft Consultancy INC Trustee Casper, Wyoming |
Standard | 2026-02-06 | ValidFAA registration status code V: Valid registration. All codes |
| N83ME | Mark W Scott AVIPRO BEARHAWK |
Fixed-wing, single engine | Co-owned owner Connecticut |
Experimental | 2025-11-18 | ValidFAA registration status code V: Valid registration. All codes |
| N949TT | Aviat Aircraft Inc PITTS S-2C |
Fixed-wing, single engine | Aero Optics INC Aguila, Arizona |
Standard | 2025-06-05 | ValidFAA registration status code V: Valid registration. All codes |
| N123FR | Slingsby T67M-260 |
Fixed-wing, single engine | Royal Air Flying LLC Colorado Springs, Colorado |
Standard | 2025-05-01 | ValidFAA registration status code V: Valid registration. All codes |
| N661AS | Aviat Aircraft Inc PITTS S-2C |
Fixed-wing, single engine | Individual owner Florida |
Standard | 2025-04-17 | ValidFAA registration status code V: Valid registration. All codes |
| N287PJ | Aviat Inc PITTS S-2B |
Fixed-wing, single engine | Individual owner Texas |
Standard | 2024-12-11 | ValidFAA registration status code V: Valid registration. All codes |
| N260GB | Siai Marchetti F.260C |
Fixed-wing, single engine | Individual owner Georgia |
Standard | 2024-04-06 | ValidFAA registration status code V: Valid registration. All codes |
| N110BK | Aviat Aircraft Inc S-2C |
Fixed-wing, single engine | Individual owner California |
Standard | 2023-09-14 | ValidFAA registration status code V: Valid registration. All codes |
| N511TD | Slingsby Aviation Ltd SLINGSBY T67M260 |
Fixed-wing, single engine | 23Nv LLC Grinnell, Iowa |
Experimental | 2023-07-26 | ValidFAA registration status code V: Valid registration. All codes |
| N68TS | Aerotek PITTS S2S |
Fixed-wing, single engine | Individual owner Texas |
Experimental | 2023-07-11 | ValidFAA registration status code V: Valid registration. All codes |
| N166BJ | Sanches William A RV-10 |
Fixed-wing, single engine | Buddy & Holly LLC Walnut Creek, California |
Experimental | 2023-05-03 | ValidFAA registration status code V: Valid registration. All codes |
| N69JX | Aerobatic Aircraft Texas Inc PITTS S2S |
Fixed-wing, single engine | Ac Holdings II INC Lewes, Delaware |
Experimental | 2023-04-11 | ValidFAA registration status code V: Valid registration. All codes |
| N833XT | Slingsby T67M-260 |
Fixed-wing, single engine | Individual owner Alabama |
Experimental | 2023-04-07 | ValidFAA registration status code V: Valid registration. All codes |
| N29DZ | Hobby Hill Farms Inc HERBCO PITTS SPECIAL |
Fixed-wing, single engine | Hotel Charlie LLC Lewes, Delaware |
Experimental | 2023-04-05 | ValidFAA registration status code V: Valid registration. All codes |
| N512KW | Slingsby Aviation Ltd SLINGSBY T67M260 |
Fixed-wing, single engine | Down Three Green LLC Liberty, Tennessee |
Experimental | 2023-03-31 | ValidFAA registration status code V: Valid registration. All codes |
| N3711P | Justin Flood DR-109 |
Fixed-wing, single engine | N8498N LLC Moore, Oklahoma |
Experimental | 2023-01-11 | ValidFAA registration status code V: Valid registration. All codes |
| N203MC | Pitts Aerobatics S-2B |
Fixed-wing, single engine | Mac IV Aeroworks LLC St Petersburg, Florida |
Standard | 2022-12-27 | ValidFAA registration status code V: Valid registration. All codes |
| N706RV | Reiter Larry J RV10 |
Fixed-wing, single engine | Kks Aviation LLC Spokane, Washington |
Experimental | 2022-12-06 | ValidFAA registration status code V: Valid registration. All codes |
| N260DX | Siai-Marchetti SF-260C |
Fixed-wing, single engine | Individual owner Georgia |
Experimental | 2022-10-18 | ValidFAA registration status code V: Valid registration. All codes |
| N60JL | Pitts Aerobatics S-2B |
Fixed-wing, single engine | Individual owner Texas |
Standard | 2022-09-07 | ValidFAA registration status code V: Valid registration. All codes |
| N255D | Hudec Darryl L F-1 ROCKET |
Fixed-wing, single engine | Individual owner Georgia |
Experimental | 2022-05-05 | ValidFAA registration status code V: Valid registration. All codes |
| N188PS | Aviat Aircraft Inc S-2C |
Fixed-wing, single engine | Blackbird Jet LLC Boca Raton, Florida |
Standard | 2022-03-30 | ValidFAA registration status code V: Valid registration. All codes |
| N610LT | Nelson Todd M RV-10 |
Fixed-wing, single engine | Withheld at owner's request | Experimental | 2022-03-29 | ValidFAA registration status code V: Valid registration. All codes |
| N388PS | Pitts S-2B |
Fixed-wing, single engine | Individual owner California |
Experimental | 2022-02-24 | ValidFAA registration status code V: Valid registration. All codes |
| N524MD | Aviat Aircraft Inc PITTS S-2B |
Fixed-wing, single engine | Stick N Rudder LLC Kensington, New Hampshire |
Standard | 2022-01-26 | ValidFAA registration status code V: Valid registration. All codes |
| N495KC | Mejia Carlos A RV-10 |
Fixed-wing, single engine | Argenta Acquisitions LLC Little Rock, Arkansas |
Experimental | 2021-11-22 | ValidFAA registration status code V: Valid registration. All codes |
| N747XP | Slingsby Aviation Ltd SLINGSBY T67M260 |
Fixed-wing, single engine | Individual owner Tennessee |
Experimental | 2021-08-16 | ValidFAA registration status code V: Valid registration. All codes |
| N26XD | Siai Marchetti F.260C |
Fixed-wing, single engine | Individual owner California |
Experimental | 2020-12-11 | ValidFAA registration status code V: Valid registration. All codes |
| N92ED | Christen Industries Inc PITTS S-2B |
Fixed-wing, single engine | Plane Fun INC Tr Trustee Snellville, Georgia |
Standard | 2020-12-02 | ValidFAA registration status code V: Valid registration. All codes |
| N291PS | Aviat Inc PITTS S-2B |
Fixed-wing, single engine | International Air Services INC Trustee Carson City, Nevada |
Standard | 2020-07-21 | ValidFAA registration status code V: Valid registration. All codes |
| N52SX | Brown Timothy J PITTS S2SE |
Fixed-wing, single engine | Individual owner Florida |
Experimental | 2020-07-21 | ValidFAA registration status code V: Valid registration. All codes |
| N5327C | Pitts Aerobatics S-2B |
Fixed-wing, single engine | Individual owner Illinois |
Standard | 2020-03-27 | ValidFAA registration status code V: Valid registration. All codes |
| N240KT | Linebaugh Jeffrey A LINEBAUGH F1 ROCKET |
Fixed-wing, single engine | Individual owner Georgia |
Experimental | 2019-12-30 | ValidFAA registration status code V: Valid registration. All codes |
| N8BC | Scott Jerry SCOTT ROCKET |
Fixed-wing, single engine | Individual owner Florida |
Experimental | 2019-08-22 | ValidFAA registration status code V: Valid registration. All codes |
| N540BH | Aviat Aircraft Inc S-2C |
Fixed-wing, single engine | Extreme Attitude Recovery & Aerobatics LLC Cincinnati, Ohio |
Experimental | 2018-11-01 | ValidFAA registration status code V: Valid registration. All codes |
| N99NF | Aviat Aircraft Inc S-2C |
Fixed-wing, single engine | Individual owner | Standard | 2018-03-21 | ValidFAA registration status code V: Valid registration. All codes |
| N51PS | Aviat Aircraft Inc S-2C |
Fixed-wing, single engine | Eastern Stearman INC Trustee Leesburg, Virginia |
Standard | 2018-02-20 | ValidFAA registration status code V: Valid registration. All codes |
| N834SS | Slingsby Aviation Ltd SLINGSBY T67M260 |
Fixed-wing, single engine | Eastern Shore Helicopters INC Labelle, Florida |
Experimental | 2017-11-27 | ValidFAA registration status code V: Valid registration. All codes |
| N80PS | Aerotek PITTS S2S |
Fixed-wing, single engine | Individual owner Maine |
Experimental | 2017-07-28 | ValidFAA registration status code V: Valid registration. All codes |
| N116LT | Aviat Aircraft Inc PITTS S-2C |
Fixed-wing, single engine | Individual owner North Carolina |
Standard | 2016-11-29 | ValidFAA registration status code V: Valid registration. All codes |
| N727AZ | Aviat Aircraft Inc S-2C |
Fixed-wing, single engine | Lazy 8 Aerobatics LLC Cushing, Maine |
Standard | 2014-09-22 | ValidFAA registration status code V: Valid registration. All codes |
| N317JK | Aviat Aircraft Inc PITTS S-2C |
Fixed-wing, single engine | Individual owner Colorado |
Standard | 2013-08-12 | ValidFAA registration status code V: Valid registration. All codes |
| N15PU | Christen Industries Inc PITTS S-2S |
Fixed-wing, single engine | North Valley Aircraft INC Valley City, North Dakota |
Experimental | 2013-03-04 | ValidFAA registration status code V: Valid registration. All codes |
| N545EA | Mxr Technologies Inc MXS |
Fixed-wing, single engine | Brad Wursten Airshows Logan, Utah |
Experimental | 2011-10-19 | ValidFAA registration status code V: Valid registration. All codes |
| N15WA | Aviat Inc PITTS S-2B |
Fixed-wing, single engine | G Force Aerobatics LLC Eugene, Oregon |
Standard | 2011-09-07 | ValidFAA registration status code V: Valid registration. All codes |
| N454JM | Aviat Aircraft Inc S-2C |
Fixed-wing, single engine | Individual owner Michigan |
Standard | 2011-04-06 | ValidFAA registration status code V: Valid registration. All codes |
| N1PW | Pitts S-2S |
Fixed-wing, single engine | Welkin Aero INC Garden Plain, Kansas |
Experimental | 2010-12-09 | ValidFAA registration status code V: Valid registration. All codes |
| N260J | Siai Marchetti F.260C |
Fixed-wing, single engine | Rs Hangar 14 LLC El Segundo, California |
Experimental | 2010-01-13 | ValidFAA registration status code V: Valid registration. All codes |
| N511MF | Christen Industries Inc PITTS S-2B |
Fixed-wing, single engine | Eastern Stearman INC Trustee Leesburg, Virginia |
Standard | 2009-09-23 | ValidFAA registration status code V: Valid registration. All codes |
| N597TJ | Aviat Inc PITTS S-2B |
Fixed-wing, single engine | Jt Airshows Slidell, Texas |
Experimental | 2008-10-28 | ValidFAA registration status code V: Valid registration. All codes |
| N153JP | Team Rocket Lp F1 F1 |
Fixed-wing, single engine | Individual owner Arizona |
Experimental | 2007-05-18 | ValidFAA registration status code V: Valid registration. All codes |
| N364SL | Aerotek PITTS S2S |
Fixed-wing, single engine | Individual owner California |
Experimental | PendingFAA registration status code R: Registration pending. All codes | |
| N789FR | Slingsby T67M-260 |
Fixed-wing, single engine | Individual owner Texas |
Standard | PendingFAA registration status code R: Registration pending. All codes |
Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 5, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.