Document ID: chunk:federal_register_of_legislation:F2009L03005:body:0:p2
Version: federal_register_of_legislation:F2009L03005
Segment Type: other
Provision Reference: 
Character Range: 2599–3678

was discovered that certain production batch numbers have tooth foot fillets below the required minimum values that would ensure the approved life limits for this part.

   The Kawasaki BK117 C-2 helicopter uses the same gear P/N from the same S/N batch as the MBB BK 117 C-2 helicopter.

   This condition, if not corrected, could lead to a significant reduction of the lifetime of IGB bevel gears, potentially resulting in failure of the IGB and consequent loss of control of the helicopter.  This AD requires a one-time inspection to determine if one of the affected bevel gears is installed.  If an affected bevel gear is installed, this AD also requires the revision of the life limit in the aircraft maintenance program, in accordance with Kawasaki Service Bulletin No. KSB-117-307A.

   This amendment mandates Rev A of the referenced SB.  The revision adds additional serial numbers to the list of affected bevel gears.

   The original issue of this AD becomes effective on 27 August 2009.

James Coyne
Delegate of the Civil Aviation Safety Authority

30 July 2009