The main gearbox on the H175 is a different animal to either type used on the H225. The H175 MGB has two accessory gearboxes, de-clutch capability and 30 mins run dry certification. I don't know if any significant component designs are shared between the two types (anyone?)
Despite this, AH/operators will be very cautious of unexpected chip debris. We don't know for certain there has been any, of course, and the salient information isn't in the public domain.
I assume that if the incident is serious enough to use a vessel to help it home it will need to be reported.
Last edited by birmingham; 17th Apr 2018 at 13:35.