airworthiness · Rule · Final rule; request for comments. · Published 2012-07-17 · Effective 2012-08-01 · 77 FR 41889
Document
Document number
2012-16944
Federal Register citation
77 FR 41889
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Sikorsky
Publication date
2012-07-17
Effective date
2012-08-01
FAA docket
Docket No. FAA-2012-0715
Abstract
We are adopting a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This AD requires inspecting the main gearbox (MGB) for a crack. This AD is prompted by a crack 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.