Enstrom Type Certificate
Flight Safety,
The tail rotor and main rotor gear boxes are factory overhauled at 1200 hours, for around $4,000 and $14,000 respectively. Everything inside is new except for the case.
Most older tail rotor spindles have been replaced with newer a newer style that has a much higher service life. Most of the parts with the low service life apply only to the original F28 "A" model.
Any of the piston models with the "C" designation or the 480 turbine have higher service limits. And a majority of the "C" model parts are also on the turbine, including main rotor blades. The "C" model parts on the piston powered models, were robust enough to use on the turbine. That is why Enstrom piston powered models are among the toughest built heli's in the industry.