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Thu, Jan 07, 2016

AD: Sikorsky Aircraft Corporation Helicopters

AD NUMBER: 2015-26-10

PRODUCT: Certain Sikorsky Aircraft Corporation (Sikorsky) Model S-76A, S-76B, and S-76C helicopters.

ACTION: Final Rule

SUMMARY: This AD requires inspecting the main gearbox (MGB) lower housing jet bores for leaks, paint or caulk blistering, and liner protrusion.

This AD was prompted by several reports of MGB low oil pressure warnings which were determined to be the result of unsecured jet bore liners that had protruded.

The actions are intended to prevent failure of the MGB from loss of oil, which could result in subsequent loss of control of the helicopter.

DATES: This AD is effective February 9, 2016.

FMI: AD

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