Airworthiness Directives; Sikorsky Aircraft-Manufactured Model S- 64F Helicopters
airworthiness · Rule · Final rule. · Published 1997-05-23 · Effective 1997-06-27 · 62 FR 28321
Document
Document number
97-12855
Federal Register citation
62 FR 28321
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Sikorsky
Publication date
1997-05-23
Effective date
1997-06-27
FAA docket
Docket No. 95-SW-34-AD
Abstract
This amendment adopts a new airworthiness directive (AD), applicable to Sikorsky Aircraft-manufactured Model S-64F helicopters, that requires inspections, and replacement, if necessary, of the main gearbox second stage lower planetary plate (plate). This amendment is prompted by two incidents in which the plate was found cracked. The actions specified by this AD are intended to prevent failure of the plate due to fatigue cracking, which could lead to failure of the main gearbox and subsequent loss of control of the helicopter.