Lycoming O-540-A4D5
7 aircraft on the U.S. register carry a Lycoming O-540-A4D5 engine, rated at about 250 horsepower. The Adams Brian E HARMON ROCKET II is the model most often fitted with it (1 aircraft). The aircraft carrying it were built between 2007 and 2024.
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 O-540-A4D5. FAA spelling: O-540-A4D5.
Fitted to model families
Adams Brian E HARMON ROCKET II · Burleigh Ron BEARHAWK · Donald Scott Hoover BEARHAWK 4 PLACE · Goode Max T VANS-RV-10 · Hans Wolfgang Grotendiek BEARHAWK · Smith Julian A BEARHAWK · Sorensen Brian G BEARHAWK
Where they are owner's state
Kind of aircraft
When the aircraft were built by decade
What the FAA has certified, ordered and been told about the Lycoming O-540-A4D5 the component layer
The design is held under 1 type certificate (E-295, held by Lycoming Engines). The FAA has issued 19 airworthiness directives (orders that owners must comply with) that name this engine series.
FAA orders 19 airworthiness directives · newest first
Certificates and bulletins
Safety bulletins 6 · advice, not orders
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
- FAA orders naming the Lycoming O-540-A4D5 19 airworthiness directives
These connections as data: /graph/engine/lycoming-o-540-a4d5.json · about the eFlight graph.
Aircraft newest certificates first · 7
| Tail no. | Maker and model | Group | Owner and base | Certificate | Registered | Status |
|---|---|---|---|---|---|---|
| N907HR | Adams Brian E HARMON ROCKET II |
Fixed-wing, single engine | Individual owner Alaska |
Experimental | 2025-11-25 | ValidFAA registration status code V: Valid registration. All codes |
| N316BH | Donald Scott Hoover BEARHAWK 4 PLACE |
Fixed-wing, single engine | Individual owner Alaska |
Experimental | 2023-02-28 | ValidFAA registration status code V: Valid registration. All codes |
| N117L | Burleigh Ron BEARHAWK |
Fixed-wing, single engine | Greene Mangos LLC Anchorage, Alaska |
Experimental | 2023-02-15 | ValidFAA registration status code V: Valid registration. All codes |
| N76RM | Goode Max T VANS-RV-10 |
Fixed-wing, single engine | Mj Aero LLC College Station, Texas |
Experimental | 2022-07-14 | ValidFAA registration status code V: Valid registration. All codes |
| N63521 | Sorensen Brian G BEARHAWK |
Fixed-wing, single engine | Individual owner New York |
Experimental | 2022-05-02 | ValidFAA registration status code V: Valid registration. All codes |
| N868JD | Smith Julian A BEARHAWK |
Fixed-wing, single engine | Individual owner Texas |
Experimental | 2017-08-30 | ValidFAA registration status code V: Valid registration. All codes |
| N117D | Hans Wolfgang Grotendiek BEARHAWK |
Fixed-wing, single engine | Hans Wolfgang Grotendiek Lc Dorr, Michigan |
Experimental | 2011-08-25 | 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.