MANUFACTURER: Bell Helicopter Textron, Inc.
(Bell), Model 205A-1, 205B, 210, and 212 Helicopters SUBJECT: Airworthiness Directive 2011-23-02 ACTION: Final rule; request for comments
SUMMARY: This amendment supersedes an existing
airworthiness directive (AD) for Bell Model 205B and 212
helicopters with certain main rotor blade (blade) assemblies
installed. That AD currently requires washing the upper and lower
surfaces of each blade and visually inspecting the grip plates,
doublers, and the remaining upper and lower surfaces of the blades
in the area between blade stations 24.5 to 40 for an edge void,
corrosion, or a crack. This amendment retains the requirements of
that AD for the affected part-numbered blades but increases the
scope and frequency of the inspections and expands the
applicability to include the Model 205A-1 and 210 helicopters,
additional blade part numbers, and all helicopter serial numbers
for the affected helicopter models.
This amendment also requires applying a light coat of
preservative oil (C-125) to all surfaces of the blade in addition
to the inspection areas as required in the existing AD. This
amendment is prompted by an additional report of a fatigue crack on
a blade installed on a Model 212 helicopter. The actions specified
by this AD are intended to detect an edge void, corrosion, or a
crack on a blade, and to prevent loss of a blade and subsequent
loss of control of the helicopter.