What is the TBO for a lycoming Tio 540?
Standard tbo (time between overhaul) for a lycoming 540 engine is about 1,800 hours. Time between overhaul (tbo) is a strange concept. The faa, in its infinite wisdom, requires aircraft engine manufacturers to publish tbos for their engines, but doesn’t require aircraft owners to abide by them. You are free to continue flying behind your engine as it remains airworthy.