Fri, Nov 17, 2006
AD NUMBER: 2006-23-14
MANUFACTURER: Air Tractor
SUBJECT: Airworthiness Directive 2006-23-14
FAA adopts a new airworthiness directive (AD) for certain Air
Tractor, Inc. (Air Tractor) Models AT-502, AT-502A, AT-502B,
AT-602, AT-802, and AT-802A airplanes.
This AD requires you to repetitively visually inspect the rudder
and vertical fin hinge attaching structure (vertical fin skins,
spars, hinges, and brackets) for loose fasteners, cracks, and/or
This AD also requires you to replace any damaged parts found as
a result of the inspection and install an external doubler at the
upper rudder hinge.
This AD results from two reports of in-flight rudder separation
from the vertical fin at the upper attach hinge area, and other
reports of airplanes with loose hinges, skin cracks, or signs of
repairs to the affected area.
We are issuing this AD to detect and correct loose fasteners;
any cracks in the rudder or vertical fin skins, spars, hinges or
brackets; and/or corrosion of the rudder and vertical fin hinge
attaching structure. Hinge failure adversely affects ability to
control yaw and has led to the rudder folding over in flight.
This condition could allow the rudder to contact the elevator
and affect ability to control pitch with consequent loss of
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