Tue, May 29, 2012
AD NUMBER: 2012-10-10
PRODUCT: Certain Boeing Model 777 airplanes.
SUBJECT: Airworthiness Directive 2012-10-10
ACTION: Final Rule
SUMMARY: This AD was prompted by reports of corrosion damage on the outer diameter chrome surface of the horizontal stabilizer pivot pins. Micro-cracks in the chrome plating of the pivot pin, some of which extended into the base metal, were also reported. This condition, if not corrected, could result in a fractured horizontal stabilizer pivot pin.
This AD requires replacing the existing horizontal stabilizer pivot pins with new or reworked pivot pins having improved corrosion resistance, doing repetitive inspections after installing the pivot pins, and doing corrective actions if necessary.
The FAA is issuing this AD to prevent a fractured horizontal stabilizer pivot pin, which may cause excessive horizontal stabilizer freeplay and structural damage significant enough to result in loss of control of the airplane.
DATES: This AD is effective June 29, 2012.
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