Sun, Apr 24, 2011
AD NUMBER: 2011-08-05
MANUFACTURER: Airbus Model A310 Series
Airplanes; and Model A300 B4-600, A300 B4-600R, A300 F4-600R Series
Airplanes, and Model A300 C4-605R Variant F Airplanes
(Collectively Called A300-600 Series Airplanes)
SUBJECT: Airworthiness Directive 2011-08-05
SUMMARY: This AD results from mandatory
continuing airworthiness information (MCAI) originated by an
aviation authority of another country to identify and correct an
unsafe condition on an aviation product. The MCAI describes the
unsafe condition as:
The ball screw nut assemblies of
the first 70 Trimmable Horizontal Stabilizer Actuators (THSA)
manufactured by Goodrich were fitted with an upper attachment
gimbal having a thickness of 58 mm (2.28 in), which is different
from the design of the final production standard. The gimbal
installed on the subsequent THSAs (final production standard) is
more robust, having a thickness of 70mm (2.76 in).
During the fatigue life
demonstration of the THSA upper attachment primary load path
elements, only a gimbal having a thickness of 70mm (2.76 in) was
used. Thereafter, no additional justification work to demonstrate
the robustness of the upper attachment fitted with a gimbal of 58
mm was accomplished. In case of failure of this gimbal, the THSA
upper attachment primary load path would be lost and the THSA upper
attachment secondary load path would engage.
Because the upper attachment
secondary load path will only withstand the loads for a limited
period of time, the condition where it would be engaged and not
detected could lead to failure of the secondary load path, which
would likely result in loss of control of the airplane.
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