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Thu, Jan 03, 2013

AD: Airbus Airplanes

AD NUMBER: 2012-25-10

PRODUCT: All Airbus Model A330-300 series airplanes and Model A340-200 and -300 series airplanes.
SUBJECT: Airworthiness Directive 2012-25-10
ACTION: Final Rule

SUMMARY:  This AD was prompted by reports that, during a flight test, several spoiler servo-controls (SSCs) did not remain locked in the retracted position (hydraulic locking function) after manual depressurization of the corresponding hydraulic circuit. Loss of that locking function–which is ensured by a blocking valve–was caused by an internal leak from a sheared seal on the blocking valve.

This AD requires inspecting to determine if certain SSCs are installed, performing an operational test of any affected SSC, and replacing if necessary.

The FAA is issuing this AD to prevent loss of the hydraulic locking function during take-off and goaround phases, which, in combination with malfunction of one engine, could result in reduced controllability of the airplane.

DATES: This AD becomes effective January 31, 2013.

FMI: AD

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