Lycoming IO-540-R1A5
1 aircraft on the U.S. register carry a Lycoming IO-540-R1A5 engine, rated at about 260 horsepower. The Piper PA-24 Comanche is the model most often fitted with it (1 aircraft).
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-R1A5. FAA spelling: IO-540-R1A5.
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-R1A5 the component layer
The design is held under 1 type certificate (1E4, held by Lycoming Engines). The FAA has issued 30 airworthiness directives (orders that owners must comply with) that name this engine series.
FAA orders 30 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
- Piper PA-24 Comanche 1 with this engine series
- Nevada 1 of these aircraft
- International Air Services INC Trustee 1 of these aircraft
- FAA orders naming the Lycoming IO-540-R1A5 30 airworthiness directives
These connections as data: /graph/engine/lycoming-io-540-r1a5.json · about the eFlight graph.
Aircraft newest certificates first · 1
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.