Lycoming IO-540-W1A5
31 aircraft on the U.S. register carry a Lycoming IO-540-W1A5 engine, rated at about 235 horsepower. The Maule M-7 is the model most often fitted with it (15 aircraft). The aircraft carrying it were built between 1982 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-540-W1A5. FAA spelling: IO-540-W1A5.
Fitted to model families
Maule M-715Maule MT-711Maule M-62Maule MX-72Maule M-9-2351
Maule M-7 · Maule MT-7 · Maule M-6 · Maule MX-7 · Maule M-9-235
Where they are owner's state
Texas4Alaska4Montana3Georgia3Florida3Arizona3Washington2Wyoming1Wisconsin1Tennessee1
Kind of aircraft
Piston singles31 (100%)
When the aircraft were built by decade
What the FAA has certified, ordered and been told about the Lycoming IO-540-W1A5 the component layer
The design is held under 1 type certificate (1E4, held by Lycoming Engines). The FAA has issued 25 airworthiness directives (orders that owners must comply with) that name this engine series. Operators and repair shops have filed 16 failure reports with the FAA since 1995, 3 of them in the last ten years.
FAA orders 25 airworthiness directives · newest first
2026-09-142026-17-10 · Reciprocating Engine Cylinder Section · engine
2026-04-082026-04-11 · Engine (Reciprocating) · engine
2024-12-052024-21-02 · Engine (Reciprocating) · engine
2022-08-152022-16-03 · Engine (RECIPROCATING) · engine
2017-08-152017-16-11 · Reciprocating Engine Power Section · engine
2015-11-032015-19-07 · Fuel injector fuel lines · engine
Failure reports 16 since · what operators and shops told the FAA
Parts most often reported as the reports name them
Spar2Blade1Bolt1Cylinder1Duct1Filter1Hub1Lifter1Magneto1Piston1
Latest reports
2018-07-09Servo: failed
2009-03-10Hub: unserviceable
2009-03-09Blade: corroded
2006-06-06Screw: loose
2006-01-07Piston: broken
Certificates and bulletins
1E4Type certificate held by Lycoming Engines · 81 models listed · revised February 28, 2018
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
- Maule M-7 15 with this engine series
- Maule MT-7 11 with this engine series
- Maule M-6 2 with this engine series
- Maule MX-7 2 with this engine series
Where they are
Biggest operators
- Southern Aircraft Consultancy INC Trustee 1 of these aircraft
Airworthiness
- FAA orders naming the Lycoming IO-540-W1A5 25 airworthiness directives
- Failure reports on the Lycoming IO-540-W1A5 16 reports since 1995
Analytics
These connections as data: /graph/engine/lycoming-io-540-w1a5.json · about the eFlight graph.
Aircraft newest certificates first · 31
| Tail no. | Maker and model | Group | Owner and base | Certificate | Registered | Status |
|---|---|---|---|---|---|---|
| N235GC | Maule M-7-235A |
Fixed-wing, single engine | Individual owner Montana |
Standard | 2026-06-24 | ValidFAA registration status code V: Valid registration. All codes |
| N147WM | Maule MX-7-235 |
Fixed-wing, single engine | Southern Aircraft Consultancy INC Trustee Casper, Wyoming |
Standard | 2026-01-29 | ValidFAA registration status code V: Valid registration. All codes |
| N3251A | Maule M-7-235B |
Fixed-wing, single engine | Brews LLC Homer, Alaska |
Standard | 2025-10-08 | ValidFAA registration status code V: Valid registration. All codes |
| N345GW | Maule M-7-235C |
Fixed-wing, single engine | Vertical Kinetics LLC Superior, Montana |
Standard | 2025-03-27 | ValidFAA registration status code V: Valid registration. All codes |
| N47UT | Maule MT-7-235 |
Fixed-wing, single engine | Co-owned owner Texas |
Standard | 2024-05-16 | ValidFAA registration status code V: Valid registration. All codes |
| N811SG | Maule MT-7-235 |
Fixed-wing, single engine | Dodson International Parts INC Rantoul, Kansas |
Standard | 2023-10-05 | ValidFAA registration status code V: Valid registration. All codes |
| N85WJ | Maule MT-7-235 |
Fixed-wing, single engine | Individual owner California |
Standard | 2023-09-05 | ValidFAA registration status code V: Valid registration. All codes |
| N3211Q | Maule M-9-235 |
Fixed-wing, single engine | Gth Capital LLC Phoenix, Arizona |
Standard | 2023-06-28 | ValidFAA registration status code V: Valid registration. All codes |
| N333CS | Maule MT-7-235 |
Fixed-wing, single engine | Flanders Leasing LLC Kouts, Indiana |
Standard | 2023-04-26 | ValidFAA registration status code V: Valid registration. All codes |
| N49MW | Maule M-7-235 |
Fixed-wing, single engine | Raviation LLC Elk Mound, Wisconsin |
Standard | 2022-03-02 | ValidFAA registration status code V: Valid registration. All codes |
| N127CP | Maule MT-7-235 |
Fixed-wing, single engine | Individual owner Texas |
Standard | 2021-05-04 | ValidFAA registration status code V: Valid registration. All codes |
| N108FB | Maule MX-7-235 |
Fixed-wing, single engine | Plane Fun INC Tr Trustee Snellville, Georgia |
Standard | 2019-12-06 | ValidFAA registration status code V: Valid registration. All codes |
| N656CG | Maule M-7-235C |
Fixed-wing, single engine | Individual owner Arizona |
Standard | 2018-11-08 | ValidFAA registration status code V: Valid registration. All codes |
| N776FF | Maule MT-7-235 |
Fixed-wing, single engine | Co-owned owner Arizona |
Standard | 2018-11-03 | ValidFAA registration status code V: Valid registration. All codes |
| N444YT | Maule M-7-235C |
Fixed-wing, single engine | Individual owner Florida |
Standard | 2018-06-27 | ValidFAA registration status code V: Valid registration. All codes |
| N574RB | Maule M-7-235 |
Fixed-wing, single engine | God'S Country Aviation LLC Trapper Creek, Alaska |
Standard | 2018-04-24 | ValidFAA registration status code V: Valid registration. All codes |
| N999WP | Maule MT-7-235 |
Fixed-wing, single engine | Co-owned owner Texas |
Standard | 2017-12-15 | ValidFAA registration status code V: Valid registration. All codes |
| N319Z | Maule MT-7-235 |
Fixed-wing, single engine | Individual owner Connecticut |
Standard | 2017-07-14 | ValidFAA registration status code V: Valid registration. All codes |
| N531WS | Maule M-7-235C |
Fixed-wing, single engine | Individual owner Florida |
Standard | 2014-08-07 | ValidFAA registration status code V: Valid registration. All codes |
| N997RM | Maule M-7-235 |
Fixed-wing, single engine | Individual owner Washington |
Standard | 2014-08-05 | ValidFAA registration status code V: Valid registration. All codes |
| N1474 | Maule M-7-235B |
Fixed-wing, single engine | Loon Mountain Aviation LLC Mccall, Idaho |
Standard | 2014-02-26 | ValidFAA registration status code V: Valid registration. All codes |
| N3448Q | Maule M-6-235 |
Fixed-wing, single engine | Sand Hill Ranch LTD Decatur, Texas |
Standard | 2013-09-23 | ValidFAA registration status code V: Valid registration. All codes |
| N770XR | Maule M-7-235B |
Fixed-wing, single engine | Arrowhead Outfitters LLC Wasilla, Alaska |
Restricted | 2012-11-27 | ValidFAA registration status code V: Valid registration. All codes |
| N47AE | Maule MT-7-235 |
Fixed-wing, single engine | Polar Air LLC Bozeman, Montana |
Standard | 2012-04-16 | ValidFAA registration status code V: Valid registration. All codes |
| N531SB | Maule M-7-235C |
Fixed-wing, single engine | Individual owner Nebraska |
Standard | 2012-03-16 | ValidFAA registration status code V: Valid registration. All codes |
| N834KB | Maule M-7-235C |
Fixed-wing, single engine | K3 LLC Sevierville, Tennessee |
Standard | 2008-12-02 | ValidFAA registration status code V: Valid registration. All codes |
| N56458 | Maule M-6-235 |
Fixed-wing, single engine | Arrowhead Outfitters LLC Wasilla, Alaska |
Standard | 2008-08-22 | ValidFAA registration status code V: Valid registration. All codes |
| N5500K | Maule MT-7-235 |
Fixed-wing, single engine | Individual owner Florida |
Standard | 2007-06-27 | ValidFAA registration status code V: Valid registration. All codes |
| N3241X | Maule MT-7-235 |
Fixed-wing, single engine | Co-owned owner Georgia |
Standard | 2007-01-16 | ValidFAA registration status code V: Valid registration. All codes |
| N9234N | Maule M-7-235A |
Fixed-wing, single engine | Nemnook Airplanes LLC Seattle, Washington |
Standard | 2005-03-22 | ValidFAA registration status code V: Valid registration. All codes |
| N230BR | Maule M-7-235B |
Fixed-wing, single engine | Maule Air INC Moultrie, Georgia |
Standard | ValidFAA registration status code V: Valid registration. 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.