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Wednesday, December 31, 2014

FAA Releases SAIB for Shur-Lok Nut on Airbus Helicopters

The FAA has released Special Airworthiness Information Bulletin (SAIB) SW-15-07, alerting owners and operators of specific Airbus Helicopters models to several reports of Shur-Lok nuts suffering loss of tightening torque.

Airbus Helicopters uses the Shur-Lok nut as a retainer of the tail rotor drive flange to the main gearbox (MGB).  After receiving several reports of the Shur-Lok nut losing tightening torque, Airbus investigated the cause and issued a series of Aircraft Service Bulletins (ASB) advising owners and operators to perform inspections and take specific corrective actions if necessary.

The European Aviation Safety Agency (EASA) has issued Airworthiness Directive AD No. 2014-0179R1 requiring the actions specified in Airbus’s ASBs. However, the FAA has not issued its own AD, having determined that loss of tightening torque alone may not create an unsafe condition.

SAIB SW-15-07 lists the models and serial numbers affected, as well as the ASB recommending inspection and corrective actions. It can be found online at the FAA Regulatory and Guidance Library.

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