airworthiness · Rule · Final rule. · Published 2013-11-08 · Effective 2013-12-13 · 78 FR 67009
Document
Document number
2013-26043
Federal Register citation
78 FR 67009
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Sikorsky
Publication date
2013-11-08
Effective date
2013-12-13
FAA docket
Docket No. FAA-2013-0514
Abstract
We are adopting a new airworthiness directive (AD) for Sikorsky Model S-76A, B, and C helicopters to require certain inspections of each spindle cuff assembly or blade fold cuff assembly for a crack. If there is a crack, this AD requires replacing the cracked part. If there is no crack, this AD requires applying white paint to the inspection area to enhance the existing inspection procedure. This AD was prompted by discovery of cracks in the spindle cuffs. The actions are intended to prevent failure of a spindle cuff assembly or blade fold cuff assembly, loss of a rotor blade, and subsequent loss of control of the helicopter.