MGB Corrosion
On our EC120, on inspection, the engineers discovered corrosion on the main rotor gearbox surface. It is located in direct line with the front air intake, and started at the junction of the upper and lower sections of the MGB. It covers about three centimetres of the joint as seen from the outside.
EC have split the gearbox and say that it has gone too far to blend out, and are requiring an exchange unit, at 64,000 euro. Ouch.
Anyone had any experience of this gearbox corroding? It seems to be a magnesium type alloy and flakes away in a white crisp dust like an oxide.
Any advice or similar experiences would be welcome.