Fri, Sep 21, 2012
AD NUMBER: 2012-18-09
PRODUCT: Bell Helicopter Textron Canada Limited (BHTC) Model 407 helicopters.
SUBJECT: Airworthiness Directive 2012-18-09
ACTION: Final Rule
SUMMARY: This AD requires the replacement of tailboom attachment hardware (attachment hardware), and the performance of initial and recurring determinations of the torque on the nuts of the tailboom-attachment bolts (bolts) at all four attachment locations.
This AD was prompted by a review of the tailboom-attachment installation, which revealed that the torque value of the bolts specified in the BHTC Model 407 Maintenance Manual and applied during manufacturing was incorrect and exceeded the torque range recommended for the bolts.
The actions required by this AD are intended to prevent an over-torque of a bolt, bolt failure, loss of the tailboom, and subsequent loss of control of the helicopter.
DATES: This AD is effective October 22, 2012.
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