SIKORSKY Model S-76A, S-76B, and S-76C helicopters. [Docket No. FAA-2014-0335; Directorate Identifier 2013-SW-021-AD; Amendment 39-18358; AD 2015-26-10] — adopts a new airworthiness directive (AD) requiring inspection of the main gearbox (MGB) lower housing jet bores for leaks, paint or caulk blistering, and liner protrusion. FAA is issuing this AD after receiving report of MGB low oil pressure warnings deemed to be caused by unsecured jet bore liners that had protruded. FAA is ...

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