2008-13-16: Fan blade

2008-13-16 Pratt & Whitney Canada Corp. (P&WC) (Formerly Pratt & Whitney Canada, Inc.) : Amendment 39-15579.; Docket No. FAA-2008- 0664; Directorate Identifier 2008-NE-04-AD. Effective Date (a) This airworthiness directive (AD) becomes effective July 10, 2008. Affected ADs (b) None. Applicability (c) This AD applies to P&WC models PW305A and PW305B turbofan engines that have a serial number (SN) listed in Table 1 of this AD. These engines are installed on, but not limited to, Bombardier Learjet M60 and Hawker Beechcraft 1000 series airplanes. Table 1.--Affected Engines by SN CA0192 CA0195 CA0197 CA0199 CA0200 CA0202 CA0203 CA0204 CA0206 CA0207 CA0208 CA0209 CA0210 CA0211 CA0212 CA0213 CA0214 CA0215 CA0216 CA0217 CA0218 CA0220 CA0221 CA0223 CA0228 CA0231 CA0232 CA0234 CA0235 CA0240 CA0241 CA0243 CA0244 CA0246 CA0247 CA0257 CA0259 CA0260 CA0280 CA0300 Reason (d) There have been two incidents of fan blade dislodgements due to blade fracture on relatively hi-time PW305 engines (over 5000 Hrs). The blade dislodgement in both cases was contained. However, engine installations sustained considerable collateral damage. The root cause of fan blade fracture was determined to be the under- minimum material condition at the fracture location. This AD requires actions that are intended to address the unsafe condition described in the MCAI, which could result in an engine shutdown and damage to the airplane. Actions and Compliance (e) Unless already done, do the following actions on all affected engines as specified in the applicability section of this AD, accomplish in accordance with P&WC Alert Service Bulletin (ASB) PW300-72-A24588, Revision 2, dated November 27, 2007: (1) For engines with more than 5,000 hours of operating time, before next flight, inspect low-pressure (LP) compressor fan blades and replace any blade that is found to be under-minimum material condition. (2)For engines with 5,000 or less, but more than 4,000 hours of operating time, within 30 hours of operating time from the effective date of this AD, but not later than September 30, 2008, inspect LP compressor fan blades and replace any blade that is found to be under-minimum material condition. (3) For engines with 4,000 or less, but more than 2,500 hours of operating time, no later than September 30, 2008, inspect LP compressor fan blades and replace any blade that is found to be under-minimum material condition, in accordance with one of the following schedules, whichever occurs first: (i) At the next first stage high-pressure compressor rotor inspection (Ref 05-20-00 scheduled maintenance checks), or (ii) At the next scheduled opportunity where the LP compressor fan is removed (Ref. Hot Section Inspection or Overhaul Shop Visit), or (iii) Within 300 hours of operating time from August 24, 2007. (4) For engines with 2,500 or less hours of operating time, before it accumulates 4,000 hours of operating time, but not later than September 30, 2008, inspect LP compressor fan blades and replace any blade that is found to be under-minimum material condition. Previous Credit (f) Inspection of the fan blades for an under-minimum material condition done before the effective date of this AD that used P&WC ASB PW300-72-A24588, dated August 24, 2007; or Revision 1, dated October 26, 2007; or P&WC SB PW300-72-24595, dated October 26, 2007; or Revision 1, dated November 28, 2007, comply with the requirements specified in this AD. Other FAA AD Provisions (g) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, Engine Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. (2) Special Flight Permits: We are limiting Special Flight Permits to one repositioning maintenance flight to facilitate the subject inspection. Related Information (h) Refer to Transport Canada Airworthiness Directive CF-2008- 08R1, dated March 18, 2008; P&WC ASB PW300-72-A24588, Revision 2, dated November 27, 2007; and P&WC SB PW300-72-24595, Revision 1, dated November 28, 2007, for related information. (i) Contact Ian Dargin, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: ian.dargin@faa.gov; telephone (781) 238-7178; fax (781) 238-7199, for more information about this AD. Material Incorporated by Reference (j) You must use Pratt & Whitney Canada Corp. Alert Service Bulletin PW300-72-A24588, Revision 2, dated November 27, 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.