EASA 2019-0003

Applies to EC175B helicopters with a main gearbox manufactured before Dec. 1, 2018. Requires repetitive inspections of the top sensor installed on the main gearbox and any necessary corrective action(s). Prompted by reported occurrences of foreign object debris (FOD) generated during the manufacturing and/or overhaul of main gearbox assemblies. Results of a technical investigation identified that FOD in the main gearbox might lead to a loss of lubrication of the mast bearing.