THERMAL GRAPHICS, INC., dba Pioneer Helicopters v. DEPARTMENT OF REVENUE. TC 4240.In the Oregon Tax Court. Decision for Plaintiff rendered November 4, 1998. PROPERTY TAXATION — AIRCRAFT 1. Under ORS 308.558(4) registered aircraft are exempt from ad valorem property taxation. STATUTORY INTERPRETATION — LEGISLATIVE INTENT 2. Whether property is exempt under a statute is a […]