Lycoming IO-540-S1A5
10 aircraft on the U.S. register carry a Lycoming IO-540-S1A5 engine, rated at about 300 horsepower. The Piper AEROSTAR 601 is the model most often fitted with it (4 aircraft). The aircraft carrying it were built between 1970 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-S1A5. FAA spelling: IO-540-S1A5.
Fitted to model families
Piper AEROSTAR 601 · Smith AEROSTAR 601 · Grahn J/Grahn G PITTS S2S · Ramsey Dennis O BEARHAWK MODEL 5 · Steele Dennis A GLASAIR III · Sung Su Kim BEARHAWK 5
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 IO-540-S1A5 the component layer
The design is held under 1 type certificate (1E4, held by Lycoming Engines). The FAA has issued 33 airworthiness directives (orders that owners must comply with) that name this engine series. Operators and repair shops have filed 31 failure reports with the FAA since 1995, 2 of them in the last ten years.
FAA orders 33 airworthiness directives · newest first
Failure reports 31 since · what operators and shops told the FAA
Parts most often reported as the reports name them
Latest reports
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
- Piper AEROSTAR 601 4 with this engine series
- Smith AEROSTAR 601 2 with this engine series
- FAA orders naming the Lycoming IO-540-S1A5 33 airworthiness directives
- Failure reports on the Lycoming IO-540-S1A5 31 reports since 1995
These connections as data: /graph/engine/lycoming-io-540-s1a5.json · about the eFlight graph.
Aircraft newest certificates first · 10
| Tail no. | Maker and model | Group | Owner and base | Certificate | Registered | Status |
|---|---|---|---|---|---|---|
| N989KC | Smith AEROSTAR 601P |
Fixed-wing, multi-engine | Niner Kilo Charlie LLC Tulsa, Oklahoma |
Standard | 2026-08-05 | ValidFAA registration status code V: Valid registration. All codes |
| N995BH | Sung Su Kim BEARHAWK 5 |
Fixed-wing, single engine | Individual owner California |
Experimental | 2026-07-13 | ValidFAA registration status code V: Valid registration. All codes |
| N567LT | Smith AEROSTAR 601 |
Fixed-wing, multi-engine | Air Flight Enterprises INC New Smyrna Beach, Florida |
Standard | 2026-05-03 | ValidFAA registration status code V: Valid registration. All codes |
| N605PS | Ramsey Dennis O BEARHAWK MODEL 5 |
Fixed-wing, single engine | Yesmar LLC Wilmington, Delaware |
Experimental | 2024-04-05 | ValidFAA registration status code V: Valid registration. All codes |
| N398MA | Piper AEROSTAR 601P |
Fixed-wing, multi-engine | Mullens Aviation LLC Estero, Florida |
Standard | 2022-07-22 | ValidFAA registration status code V: Valid registration. All codes |
| N283AC | Piper AEROSTAR 601P |
Fixed-wing, multi-engine | Medical Transport INC Dover, Delaware |
Standard | 2022-06-01 | ValidFAA registration status code V: Valid registration. All codes |
| N601B | Piper AEROSTAR 601 |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 2022-02-22 | ValidFAA registration status code V: Valid registration. All codes |
| N330DS | Steele Dennis A GLASAIR III |
Fixed-wing, single engine | Lively Charters INC Summerland Key, Florida |
Experimental | 2019-09-25 | ValidFAA registration status code V: Valid registration. All codes |
| N540S | Grahn J/Grahn G PITTS S2S |
Fixed-wing, single engine | Code Supplies INC Rossville, Tennessee |
Experimental | 2001-07-12 | ValidFAA registration status code V: Valid registration. All codes |
| N232MF | Piper AEROSTAR 601P |
Fixed-wing, multi-engine | Rocky Mountain Sport Jets LLC Desert Hills, Arizona |
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.