https://www.businesswire.com/news/home/ ... d-Maintain
Robinson Helicopter Company (RHC), the world’s leading manufacturer of civil helicopters, obtained FAA approval to double the service life on specific Robinson R66 helicopter components from 2,000 to 4,000 hours. This approval, backed by previously approved data and structural testing, will help operators reduce maintenance costs, enhance reliability, lower operating costs by 6%, and reduce hourly reserve for overhauls by 25%.
...
The extended service life applies to twelve selected parts, including five components within the main rotor gearbox. This means fewer overhauls and reduced maintenance expenses for R66 operators. In addition to the retirement life extensions mentioned above, the calendar life for the R66 main rotor and tail rotor blades increased from 12 years to 15 years.