airworthiness · Rule · Final rule. · Published 2012-11-15 · Effective 2012-12-20 · 77 FR 68061
Document
Document number
2012-26907
Federal Register citation
77 FR 68061
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Sikorsky
Publication date
2012-11-15
Effective date
2012-12-20
FAA docket
Docket No. FAA-2012-0216
Abstract
We are adopting a new airworthiness directive (AD) for the Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This AD requires inspecting the tail rotor (T/R) pylon for a loose or missing fastener, a crack, damage, or corrosion and adding an internal doubler to the aft shear deck tunnel assembly. This AD was prompted by the discovery of cracks in T/R pylons. The actions are intended to detect a loose or missing fastener, a crack, damage, or corrosion on the T/R pylon and, if present, to repair the T/R pylon and install a doubler on the aft shear deck tunnel assembly or to replace the T/R pylon and install a doubler on the aft shear deck tunnel assembly. The actions are intended to prevent failure of the T/R pylon or other T/R components, which could lead to the loss of control of the helicopter.