Document ID: chunk:federal_register_of_legislation:F2009L03833:body:0:p2
Version: federal_register_of_legislation:F2009L03833
Segment Type: other
Provision Reference: 
Character Range: 2825–4648

FH.

                  b. For MR Blades with more than 1800 FH time since new:

                  Within 300 FH after the effective date of this AD, or within 300 FH since the last required inspection. Inspect thereafter at intervals not to exceed 300 FH.
             This Amendment becomes effective on 19 November 2009.
Background:  In response to recent incidents, the manufacturer recommends an immediate inspection for bulging on the upper and lower surfaces of the main rotor blades in the area of the outboard lead balance weight.

             Amendment 1 included all main rotor blades.

             Amendment 2 reflected the changed issue date of the LBA AD, no further work was required.

             Amendment 3 was issued in response to a revision of the related LBA AD.  The amendment corrected applicability and specified the requirements of the latest LBA AD.

             Amendment 4 was issued to exclude certain Main Rotor Blade part numbers from inspection in accordance with this Airworthiness Directive.  There was no change to the requirements or compliance.

             Amendment 5 was issued to advise that blades are now available that do not have lead balance weights and that fitment of these blades is terminating action for the requirements of this Airworthiness Directive.  The inspection requirements for those blades that have balance weights were retained.

             This Amendment extends the repetitive inspection interval from 50 to 300 Flight Hours and depending on inspection findings requires replacement of MR blades.  Additionally the prohibition of reinstallation of MR blades with lead balance weights (having a P/N not listed in ECD ASB-MBB-BK117-10-108) has been deleted.

David Villiers
Delegate of the Civil Aviation Safety Authority

28 September 2009