Lifespan of a Double Ignition Coil
I'm at 1,600 hours on my 912iS and have now had two failed ignition coils within the last few months. They were easy to diagnose although it's worth noting that it will not necessarily throw a lane light/fault code.
They were both identified during the runup. Shutting down Lane A at 4,000 rpms produced a very rough running engine and a significant drop in EGT on Cylinder #3. Having just installed a new fuel injector on 3T, we concluded it had to be the ignition coil.
Coil #4 replaced. Problem solved.
I'm going to start traveling with a spare coil and a set of metric allen wrenchs in my flight bag as I still have two of the old coils on the engine.
Aviation Real Estate Specialist & iRMT