Document ID: chunk:federal_register_of_legislation:F2009L02332:body:0:p2
Version: federal_register_of_legislation:F2009L02332
Segment Type: other
Provision Reference: 
Character Range: 2535–3351

and less than 4,500 Cycles - Before the life of the LPT Casing has reached 4,500 Cycles since last full FPI.

             For Requirement 2:

             At intervals not exceeding 4,500 Cycles.
             This Airworthiness Directive becomes effective on 2 July 2009.
Background:  A number of LPT casings have been found cracked during engine shop visit.  Cracking of the LPT casing reduces the capability of the casing to contain debris in the event of an LPT stage 1 blade failure.  Therefore, blade failure in an engine featuring a cracked LPT casing may result in release of uncontained high energy debris.  For the reason described above, this AD requires repetitive inspections and corrective actions, depending on findings.

James Coyne
Delegate of the Civil Aviation Safety Authority

19 May 2009