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Fri, Jun 01, 2007

AD: Sikorsky

AD NUMBER: 2007-11-05
MANUFACTURER: Sikorsky
SUBJECT: Airworthiness Directive 2007-11-05
SUMMARY: 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.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/

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