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Monday, November 1, 2010

FAA Requires S-76 Inspections

The U.S. Federal Aviation Administration is requiring initial and recurring inspections of the tail rotor vertical stabilizer aft spar assembly on the Sikorsky S-76A, B and C models. The airworthiness directive—which took effect on October 18—calls for maintenance personnel to look for cracks, loose or working fasteners, and corrosion. If any of these conditions are discovered, additional inspections of the vertical stabilizer forward spar assembly are required. Other actions under the AD include recurring track-and-balance of the tail rotor and installation of a vertical stabilizer modification kit. The AD comes after a series of 26 reports of cracking in the aft spar assembly. If left unchecked, the condition could lead to an unbalanced or out-of-track tail rotor, which could result in increased vibrations, a loss of part of the vertical stabilizer and/or losing control of the helicopter, according to FAA. (From November 2010 Rotorcraft Report)

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