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Thu, Jun 21, 2007

AD: Boeing

AD NUMBER: 2007-13-05
MANUFACTURER: Boeing
SUBJECT: Airworthiness Directive 2007-13-05
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all Boeing Model 777 airplanes. This AD requires repetitive measurements of the freeplay of the right and left elevators, rudder, and rudder tab, and related investigative and corrective actions if necessary.

This AD also requires repetitive lubrication of the elevator, rudder, and rudder tab components.

This AD results from reports of freeplay- induced vibration of unbalanced control surfaces. Excessive freeplay ofcontrol surfaces can cause unacceptable airframe vibration during flight.

The potential for vibration of the control surface should be avoided because the point of transition from vibration to divergent flutter is unknown.

We are issuing this AD to prevent flutter, which can cause damage to the control surface structure and consequent loss of control of the airplane.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/

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