2255 Hours Since O&N Conversion, Upgrade Garmin Avionics! Call to Inquire. Airframe: 2,255.3 Hours Since O&N Conversion COMPRESSOR ASSEMBLY: 395.3 Hours Since New / 395 Cycles Overhaul due at 3500 TT TURBINE ASSEMBLY: 395.3 Hours Since New / 395 Cycles HSI @ 1,518.2 / 1,012.9 Hours to HSI Engines: Time: 2255 TBO: 3600 Cycles: 2833......more.