2005-25-10: Propeller hubs

2005-25-10 Dowty Propellers: Amendment 39-14403. Docket No. 2001-NE- 50-AD. Effective Date (a) This airworthiness directive (AD) becomes effective December 27, 2005. Affected ADs (b) This AD supersedes AD 2005-20-12, Amendment 39-14306. Applicability (c) This AD applies to Dowty Propellers Type R321/4-82-F/8, and R324/4-82-F/9, R333/4-82-F/12 propeller assemblies with propeller hubs part number (P/N) 660709201, installed on, but not limited to, British Aerospace Regional Aircraft Jetstream Models 3101 and 3201, Fairchild Aircraft, Inc., Merlin IIIC, and Merlin IVC/Metro III airplanes, and to Type R334/4-82-F/13 propeller assemblies with hubs P/N 660709201, installed on Construcciones Aeronauticas, S.A. (CASA) 212 airplanes. Unsafe Condition (d) This AD results from comments received on AD 2005-20-12. We are issuing this AD to prevent propeller hub failure due to cracks in the hub, which could result in loss of control of 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) Propeller hubs, P/N 660709201, previously inspected using Dowty Mandatory Service Bulletins (MSBs) listed in Table 1 or an earlier issue of those MSBs, are already in compliance with paragraph (g) of this AD and do not need another initial inspection. Table 1.--Applicable MSB for Propeller Type Propeller assembly type Initial inspection within the earlier of * * * Repeat inspection within *** Applicable MSB (1) R334/4 82 F/13 10 flight hours (FH) time-in-service (TIS) or 20 days after the effective date of this AD. 300 FH time-since-last-inspection (TSLI) or 300 flight cycles-since-last-inspection, whichever occurs sooner. Alert MSB No. 61 1119, Revision 4, dated September 14, 2005. (2) R321/4 82 F/8 .. 50 FH TIS or 60 days after the effective date of this AD.1,000 FH TSLI MSB No. 61 1125, Revision 1, dated October 9, 2002. (3) R324/4 82 F/9 .. 50 FH TIS or 60 days after the effective date of this AD. 1,000 FH TSLI MSB No. 61 1126, Revision 1, dated October 9, 2002. (4) R333/4 82 F/12 50 FH TIS or 60 days after the effective date of this AD. 1,000 FH TSLI. MSB No. 61 1124, Revision 1, dated October 8, 2002. Initial Ultrasonic Inspections (g) Perform an initial ultrasonic inspection of the rear wall of the rear half of the propeller hub for cracks within the compliance time specified in the following Table 1. Use Appendix A or Appendix D of the applicable Dowty Mandatory Service Bulletin (MSB) listed in Table 1 of this AD. (h) For hubs and propellers in storage, perform an initial ultrasonic inspection of the rear wall of the rear half of the propeller hub for cracks, before placing in service. Use Appendix A or Appendix D of the applicable Dowty MSB listed in Table 1 of this AD. Repetitive Ultrasonic Inspections (i) Thereafter, perform a repetitive ultrasonic inspection of the rear wall of the rear half of the propeller hub for cracks within the compliance time specified in Table 1 of this AD. Use Appendix A or Appendix D of the applicable Dowty Mandatory Service Bulletin (MSB) listed in Table 1 of this AD. Inspection Reporting Requirements (j) Within 10 days after each inspection, record the inspection data on a copy of Appendix B of the applicable MSB listed in Table 1 of this AD. Report the findings to the Manager, Boston Aircraft Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803-5299. The Office of Management and Budget (OMB) approved the reporting requirements and assigned OMB control number 2120-0056. Alternative Methods of Compliance (k) The Manager, Boston 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. Documents That Have Been Incorporated by Reference (l) You must use the service information specified in Table 2 to perform the inspections required by this AD. The Director of the Federal Register previously approved the incorporation by reference of Dowty Mandatory Service Bulletin (MSB) No. 61-1124, Revision 1, dated October 8, 2002; MSB No. 61-1125, Revision 1, dated October 9, 2002, MSB 61-1126 and Revision 1, dated October 9, 2002 as of July 27, 2004 (69 FR 34560, June 22, 2004), and Dowty Alert (MSB) No. 61- 1119, Revision 4, dated September 14, 2005, as of October 28, 2005 (70 FR 59647, October 13, 2005), in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Dowty Propellers, Anson Business Park, Cheltenham Road East, Gloucester GL 29QN, UK; telephone 44 (0) 1452 716000; fax 44 (0) 1452 716001 for a copy of this service information. You may review copies at the FAA, New England Region, Office of the Regional Counsel, 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 . Table 2.--Incorporation by Reference Service Bulletin No. Page Revision Date Alert MSB No. 61 1119 All ................ 4 .................. September 14, 2005. 1 .................. 1 .................. November 27, 2001. 2 .................. Original ........ November 1, 2001. Appendix A 3 6 .............. 1 .................. November 27, 2001. Appendix B 1 .................. Original ........ November 1, 2001. Appendix C All ................ Original ........ November 27, 2001. Appendix D All ................ Original ........ December 6, 2001. Total pages: 30 1 .................. 1 .................. October 8, 2002. MSB No. 61 1124 2 3.............. Original ........ May 7, 2002. Appendix A All ................ Original ........ May 7, 2002. Appendix B All ................ Original ........ May 7, 2002. Appendix C All ................ Original ........ May 7, 2002. Appendix D All ................ Original ........ May 7, 2002. Total pages: 30 1 .................. 1 .................. October 9, 2002. MSB No. 61 1125 2 3 .............. Original ........ May 7, 2002. Appendix A All ................ Original ........ May 7, 2002. Appendix B All ................ Original ........ May 7, 2002. Appendix C All ................ Original ........ May 7, 2002. Appendix D All ................ Original ........ May 7, 2002. Total pages: 30 1 .................. 1 .................. October 9, 2002. MSB No. 61 1126 2 3 .............. Original ........ May 7, 2002. Appendix A All ................ Original ........ May 7, 2002. Appendix B All ................ Original ........ May 7, 2002. Appendix C All ................ Original ........ May 7, 2002. Appendix D All ................ Original ........ May 7, 2002. Total pages: 30 Related Information (m) United Kingdom (U.K.) Civil Aviation Authority (CAA) airworthiness directives No. G-2005-0027, dated September 8, 2005; CAA UK AD No. 009-05-2002, dated April 15, 2003; CAA UK AD No. 010-05-2002, dated April 15, 2003; and CAA UK AD No. 011-05-2002, dated April 15, 2003, also addresses the subject of this AD.