2004-04-09: Impellers

2004-04-09 Pratt & Whitney Canada: Amendment 39-13490. Docket No. 2003-NE-41-AD. Effective Date (a) This AD becomes effective April 5, 2004. Affected ADs (b) None. Applicability (c) This AD applies to Pratt & Whitney Canada (PWC) JT15D-1, - 1A, and -1B turbofan engines with certain impellers, part number (P/ N) 3020365, installed. These engines are installed on, but not limited to, Cessna Aircraft Company Models 500 and 501 airplanes. Unsafe Condition (d) This AD results from three reports of uncontained failure of the impeller. The actions specified in this AD are intended to prevent uncontained failure of the impeller and possible damage to the airplane. Compliance (e) You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. (f) If you have already inspected the impeller, P/N 3020365, using PWC overhaul manual Revision 14, or if the impeller is listed in Appendix A of PWC Service Bulletin (SB) No. JT15D-72-7590, dated May 23, 2003, no further action is required. One-Time Borescope Inspection (g) Perform a one-time borescope inspection of the impeller rear face for evidence of a machined groove or step, using paragraph 3.B. of Accomplishment Instructions of PWC SB No. JT15D-72-7590, dated May 23, 2003, as follows: (1) For engines with 5,000 or more cycles-since-new (CSN) on the effective date of this AD, inspect within 250 cycles-in-service (CIS) after the effective date of this AD. (2) For engines with fewer than 5,000 CSN on the effective date of this AD, inspect before reaching 5,250 CSN. Disposition of Inspected Impellers (h) Before further flight, repair or replace impellers that do not pass the inspection requirements of paragraph 3.B.(8) of Accomplishment Instructions of PWC SB No. JT15D-72-7590, dated May 23, 2003. Alternative Methods of Compliance (i) The Manager, Engine Certification Office, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19. Material Incorporated by Reference (j) You must use Pratt & Whitney Canada Service Bulletin No. JT15D-72-7590, dated May 23, 2003, to perform the one-time inspection required by this AD. The Director of the Federal Register approved the incorporation by reference of this service bulletin in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. You can get a copy from Pratt & Whitney Canada, 1000 Marie-Victorin, Longueuil, Quebec, Canada J4G1A1, telephone (800) 268-8000; fax (450) 647-2888. You can review copies at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Related Information (k) Transport Canada airworthiness directive No. CF-2003-17, dated June 23, 2003, also addresses the subject of this AD.