American S5-125
2 aircraft on the U.S. register carry an American S5-125 engine, rated at about 125 horsepower. The Security National Acft Corp S1-B is the model most often fitted with it (1 aircraft). The aircraft carrying it were built between 1938 and 1999.
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 American S5-125. FAA spelling: S5-125.
Fitted to model families
Security National Acft Corp S1-B · Van Grouw R A/Cantrell L LANCAIR L IV-P
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 American S5-125 the component layer
The design is held under 1 type certificate (TC 181, held by American Aircraft Company). No FAA order in the current files names this engine series.
Certificates and bulletins
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
- New Jersey 1 of these aircraft
- California 1 of these aircraft
- California Antique Aircraft Museum 1 of these aircraft
These connections as data: /graph/engine/american-s5-125.json · about the eFlight graph.
Aircraft newest certificates first · 2
| Tail no. | Maker and model | Group | Owner and base | Certificate | Registered | Status |
|---|---|---|---|---|---|---|
| N540LM | Van Grouw R A/Cantrell L LANCAIR L IV-P |
Fixed-wing, single engine | Individual owner New Jersey |
Experimental | 2024-04-27 | ValidFAA registration status code V: Valid registration. All codes |
| N15536 | Security National Acft Corp S1-B |
Fixed-wing, single engine | California Antique Aircraft Museum San Martin, California |
Standard | 1997-12-11 | 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 7, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.