2009-03-05: Compressor turbine (CT) disc bore

2009-03-05 Pratt Whitney Canada: Amendment 39-15806. Docket No. FAA- 2007-0219; Directorate Identifier 2007-NE-46-AD. Effective Date (a) This airworthiness directive (AD) becomes effective March 27, 2009. Affected ADs (b) None. Applicability (c) This airworthiness directive (AD) applies to Pratt & Whitney Canada (PWC) PW206A, PW206B, PW206B2, PW206C, PW206E, PW207C, PW207D, and PW207E turboshaft engines. (d) These engines are installed on, but not limited to, MD Explorer, Agusta S.p.A. A109, A109E, A109S, Bell Helicopter Textron Canada Limited 427, and Eurocopter Deutschland GmbH EC135 P1, and EC135 P2 helicopters. (e) For engines that have been converted from one model to another, see Effectivity paragraph 1.A. of PWC Alert Service Bulletin (ASB) PW200-72-A28280, Revision 4, dated August 28, 2007. Reason (f) Transport Canada AD CF-2007-24R1, dated December 21, 2007, states: PW206 and PW207 compressor turbine (CT) disc bore areas may experience impact damage resulting from bending or fracture of the CT disc retaining nut. Damage of the CT disc bore area can reduce LCF capabilities of the CT disc, resulting in disc fracture. We are issuing this AD to prevent damage to the CT disc bore area, which could result in possible uncontained failure of the disc and damage to the helicopter. Actions and Compliance (g) Unless already done, do the following actions: (1) For engines that have never had a shop visit and have accumulated 4,000 CT cycles or more since new; or for engines that accumulated 2,700 CT cycles or more since last shop visit, last CT disc inspection, or incorporation of PWC SB PW200-72-28287; within 1,150 hours of engine operating time since April 28, 2006 (original issue date of Alert Service Bulletin (ASB) PW200-72-A28280), but not later than 30 days after the effective date of this AD, whichever occurs first, accomplish the following in accordance with PWC ASB PW200-72-A28280, Revision 4, dated August 28, 2007: (i) Inspect the CT disc bore area for damage and if any damage is noticed, replace the CT disc before further flight. (ii) Replace the existing CT disc retaining nut and associated hardware. (2) For engines that have never had a shop visit and have accumulated less than 4,000 CT cycles since new, before the engine reaches 4,000 CT cycles or within 30 days after the effective date of this AD, whichever occurs later, accomplish the following in accordance with PWC ASB PW200-72-A28280, Revision 4, dated August 28, 2007: (i) Inspect the CT disc bore area for damage and if any damage is noticed, replace the CT disc before further flight. (ii) Replace the existing CT disc retaining nut and associated hardware. (3) For engines that have accumulated fewer than 2,700 CT cycles since last shop visit, last CT disc inspection, or incorporation of PWC SB PW200-72-28287; before the engine reaches 2,700 CT cycles or within 30 days after the effective date of this AD, whichever occurs later, accomplish the following in accordance with PWC ASB PW200-72- A28280, Revision 4, dated August 28, 2007: (i) Inspect the CT disc bore area for damage and if any damage is noticed, replace the CT disc before further flight. (ii) Replace the existing CT disc retaining nut and associated hardware. Previous Credit (h) Inspection of the CT disc bore and replacement of the CT disc retaining nut using PWC ASB PW200-72-A28280, dated April 28, 2006, or Revision 1, dated May 11, 2006, or Revision 2, dated September 29, 2006, or Revision 3, dated December 11, 2006, before the effective date of this AD, meets the requirements of this AD. Other FAA AD Provisions (i) Alternative Methods of Compliance (AMOCs): The Manager, Engine Certification Office, FAA, may approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Related Information (j) Refer to Transport Canada Airworthiness Directive 2007-24R1, dated December 21, 2007, for related information. (k) Contact Ian Dargin, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park; Burlington, MA 01803; e-mail: ian.dargin@faa.gov; telephone (781) 238-7178; fax (781) 238-7199. Material Incorporated by Reference (l) You must use Pratt & Whitney Canada Alert Service Bulletin (ASB) PW200-72-A28280, Revision 4, dated August 28, 2007 to do the actions required by this AD, unless the AD specifies otherwise. (1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this AD, contact Pratt & Whitney Canada Corp., 1000 Marie-Victorin, Longueuil, Quebec, Canada J4G 1A1, telephone: (800) 268-8000. (3) You may review copies at the FAA, New England Region, 12 New England Executive Park, Burlington, MA; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call (202) 741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.