Hot Section Inspection must be performed every 1750 hours (Citations) or 1800 hours (BeechJet). Our STC moves HSI out 2000 hours and allows you to perform a hot section inspection up to 300 hours early so that it can coincide with other work. This has a 300 hour over-run on the backside. Although the FAA interpretation does allow Part 91 operators not to mandatorily comply with Overhaul, it does not relieve the requirement for hot-sections. Operational data for fleet programs have clearly shown operating the engine more than 2300 hours since last HSI exposes engine to rapid hot section deterioration, this increases the likelihood of internal failures and in-flight shutdowns. Additionally, most insurance requires compliance with OEM recommended maintenance programs or those approved by the FAA.