EASA 2018-0263

AD superseded but partially retains the requirements of EASA AD 2018-0052—which is superseded and mandates repetitive inspections of the main gearbox (MGB) oil filter, a one-time inspection for particles of the MGB bottom housing (oil sump) and reducing the life limit of type Z planet gear assemblies—and additionally requires repetitive inspections of the MGB bottom housing, repetitive inspections of the MGB filter, and any necessary corrective action(s). Prompted by investigation of an EC225 helicopter that revealed the failure of a second-stage planet gear of the MGB.