AD NUMBER: 2006-11-12
SUBJECT: Airworthiness Directive 2006-11-12 SUMMARY: The
FAA is adopting a new airworthiness directive (AD) for all Boeing
Model 767 airplanes. This AD requires repetitive measurements of
the rudder and elevator freeplay, repetitive lubrication of rudder
and elevator components, and related investigative/ corrective
actions if necessary.
This AD results from reports of freeplay -induced vibration of
the rudder and the elevator. 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 excessive vibration of
the airframe during flight, which could result in loss of control
of the airplane.