SIKORSKY Model S-92A helicopters [Docket No. FAA-2012-0715; Directorate Identifier 2012-SW-039-AD; Amendment 39-17122; AD 2012-14-08] – requires inspecting the main gearbox (MGB) for a crack. This AD is prompted by a crack discovered in the cored passage of the MGB housing, which may be indicated by oil on the housing. These actions are intended to detect a crack in the MGB housing, which could result in loss of oil, failure of the MGB, and subsequent loss of control of the helicopter. FAA ...
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