Document ID: chunk:federal_register_of_legislation:F2009L00691:body:0:p2
Version: federal_register_of_legislation:F2009L00691
Segment Type: other
Provision Reference: 
Character Range: 2876–3693

of this AD but no later than 28 February 2009, whichever occurs first.
             This Airworthiness Directive becomes effective on 23 February 2009.
Background:  Following several third stage turbine wheel failures, the engine Type Certificate holder, Rolls-Royce Corporation, issued Commercial Engine Bulletin (CEB) A-1400 Rev. 3 to introduce an operational limitation on the power turbine N2 speed range (95% - 97%) for more than 60 seconds in single or cumulative events for engines with a third stage turbine wheel having P/N 23065833 installed.

             Thereafter, Agusta issued Bollettino Tecnico (BT) 109-129 to introduce the same operating limitation, which is also required by this AD, on the affected helicopters.

David Villiers
Delegate of the Civil Aviation Safety Authority

20 February 2009