Summary
We are adopting a new airworthiness directive (AD) for certain Sikorsky Aircraft Corporation (Sikorsky) Model S-76A, S-76B, and S-76C helicopters. 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.
Directive Details
AD Number
FAA-2014-0335
Document Number
2015-33013
Type
Rule
Publication Date
January 5, 2016
Effective Date
February 9, 2016
Affected Manufacturer
Sikorsky Aircraft Corporation
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2014-0335
Topics
Official Documents
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