> Aircraft maintenance checks happy every 500 flight hours. Engines get overhauled completely every 1,500 hours. Maintenance and overhauls don't address design

> Aircraft maintenance checks happy every 500 flight hours. Engines get overhauled completely every 1,500 hours. Maintenance and overhauls don't address design issues. Exactly the opposite; the people that perform checks and maintenance are expressly not supposed to deviate from approved designs and published processes. Conflating these tasks with regulatory scrutiny shows a fundamental misunderstanding about this discussion. And airliner engines are not 'completely overhauled' every 1,500 hours. Figures that low are related to small aircraft engines, usually piston engines.