FAA 2023-14-07

Requires repetitive endoscope inspection of certain main gearbox oil cooling fan hubs, including the area around the fan hub attachment screws, for cracks. Depending on inspection results, AD requires performing additional inspections and replacing an affected fan hub. This AD also allows an affected fan hub to be installed on a helicopter if certain actions are accomplished. Prompted by reports of failure of the main gearbox oil cooling fan hub.