Wednesday, July 20, 2011
Airbus Models A300-600, A310 Series Require Repair
The FAA’s Airworthiness Direction (AD) FAA-2011-0309 requires Airbus Models A300- 600 Series and A310 Series to be safely repaired after the trimmable horizontal stabilizer actuator (THSA) upper primary attachment failed, the agency said Tuesday.
According to the AD, bearing migration from the upper attachment gimbal by failure or loss of a retention belt can cause primary load path failure. When the THSA upper primary attachment fails, the TSHA upper secondary attachment is designed to engage. The upper secondary load path can only withstand the loads for a limited period of time, the condition were it could be engaged could lead to the failure of the secondary load path, if undetected. This could result in loss of control of the airplane.
The final rule AD becomes effective August 22, 2011.