Manufacturer
Leonardo Helicopters
Number
EASA 2019-0036
Model(s)
AB139 and AW139
Published Date
Effective Date
Summary
Requires removal of an affected main gearbox (MGB) and a one-time replacement of the bearing lock-nut installed on these MGBs. Prompted by an event where, during non-destructive testing accomplished as a part of MGB overhaul activity, a cracked MGB bearing lock-nut was found. The lock-nut helps to keeps the planetary gears in position.
UUID
70