Document ID: chunk:federal_register_of_legislation:F2006L01353:body:0:p2
Version: federal_register_of_legislation:F2006L01353
Segment Type: other
Provision Reference: 
Character Range: 2967–4565

400 cycles or prior to exceeding 16,200 cycles whichever occurs first; or

                For wheels of "Medium Heavy" carbide precipitation classification which have from 10,500 to 14,000 total cycles upon the effective date of this AD, compliance is required within the next 1000 cycles or prior to exceeding 14,400 total cycles whichever occurs first; or

                For wheels of "Medium Heavy" carbide precipitation classification which have from 8000 to 10,500 total cycles on the effective date of this AD, compliance is required within the next 2000 cycles or prior to exceeding 11,500 total cycles whichever occurs first; or

                For wheels of "Medium Heavy" carbide precipitation classification which have from 7000 to 8000 total cycles on the effective date of this AD, compliance is required prior to exceeding 10,000 cycles; or

                For wheels of "Medium Heavy" carbide precipitation classification which do not exceed 7000 total cycles upon the effective date of this AD, compliance is required prior to exceeding 8000 cycles.

                For purposes of this airworthiness directive a cycle is defined as one takeoff.
             This Airworthiness Directive becomes effective on 8 June 2006.
Background:  The requirements of this AD are to preclude failure of the 3rd or 4th Stage turbine wheels based upon the level of carbide precipitation.  It has been determined that the level of carbide precipitation may affect the projected safe life of the turbine wheel.

James Coyne
Delegate of the Civil Aviation Safety Authority

28 April 2006