Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76A, B, and C Helicopters
airworthiness · Rule · Final rule; request for comments. · Published 2007-05-31 · Effective 2007-06-15 · 72 FR 30247
Document
Document number
E7-10126
Federal Register citation
72 FR 30247
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Sikorsky
Publication date
2007-05-31
Effective date
2007-06-15
FAA docket
Docket No. FAA-2007-28241
Abstract
This amendment adopts a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-76A, B, and C helicopters. This action requires a one-time ultrasonic inspection of the main rotor shaft assembly (M/R shaft) for cracking. This amendment is prompted by the discovery of cracking that occurred during the manufacturing of certain M/R shafts. The actions specified in this AD are intended to detect cracking in the M/R shaft, which could result in separation of the main rotor and subsequent loss of control of the helicopter.