AD 2016-10-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A330-200 Freighter | Airworthiness Directives; Airbus Airplanes |
Unsafe Condition
Premature wear of the carbon friction disks on the no-back brake (NBB) of the trimmable horizontal stabilizer actuator (THSA) can lead to reduced braking efficiency in specific load conditions. This, combined with the inability of the power gear train to maintain the ball screw in its last commanded position, could result in uncommanded movements of the trimmable horizontal stabilizer (THS) and loss of control of the airplane.
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Required Actions
Inspect certain THSAs to determine the number of total flight cycles accumulated. Replace the THSA if necessary, specifically focusing on THSAs with part numbers 47147, 47172, and 47175 as installed on the affected models. Send affected THSAs to a shop for NBB carbon disk replacement.
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Compliance Time
Within 12 months of the effective date (June 24, 2016)
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Affected Aircraft
Airbus Model A330-200 Freighter, A330-200, A330-300, A340-200, A340-300, A340-500, A340-600, A340-541, and A340-642 series airplanes with THSA part numbers 47147, 47172, and 47175.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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