Use of unleaded fuel in aircraft engines
The CAA has reminded the GA community that two CS-STAN (Standard Change) are already available which enable suitable aircraft to utilise unleaded aviation gasoline.
CS-SC202c and CS-SC203c can be used in conjunction with approvals from both airframe and engine manufacturers to utilise certain unleaded fuels and update manuals and placards as required.
AOPA has created a database of airframe and engine data to help owners to understand if their aircraft could be eligible (note this is for guidance only). You can search the database here.