per 100,000 flight hours in 1983 to 0.97 per 100,000 flight hours for the 12 months preceding July 1995. Robinson's statistics show the rate of fatal R22 accidents per 100,000 flight hours fell from 6.0 in 1982 to 0.7 in 1997. As of 2012, more than 17,000 students have gone through the course. R22 cost The R22 has a suggested retail price of $318,000 (ex factory price, USA) and the value on the second-hand market is dependent on component time in service. Operating cost, per the factory, including insurance, reserve for overhaul, and direct operating cost (fuel, oil, inspections, unscheduled maintenance) is US$163.71/hr. A full overhaul of major components is required at 2200 hours (or 12 years, whichever comes first), which is sometimes known as "Timex". Depreciation on a Robinson R22 is negligible, as freshly overhauled R22s typically sell for more than the original cost. However, a provision per flown hour must be made for a "reserve for overhaul" cost, currently estimated at US$72.21 per hour. (Total approximate overhaul cost: ~$72.21 x 2200 Hours = ~US$158,862) The Robinson price list is updated in February each year. Specifications (R22) See also References External links Robinson Helicopter Company web site Robinson Helicopter Owners Group Frank Robinson and development of the R22 EASA Type Certificate Data Sheet - R22/R22 ALPHA/R22 BETA/R22 MARINER 1970s United States helicopters 1970s United States civil utility aircraft R22 Single-engined piston helicopters Aircraft first flown in 1975