AD 2005-25-10R1 Airworthiness Directives; Dowty Propellers Type R321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12, and R334/4-82-F/13 Propeller Assemblies

Makes named: dowty. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Dowty Propellers Type R321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12, and R334/4-82-F/13 propeller assemblies with propeller hubs, part number (P/N) 660709201.

Comply with this AD within the compliance times specified, unless already done. Initial Ultrasonic Inspections (f) 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 Table 1 of this AD. Use Appendix A or Appendix D of the applicable Dowty Alert Service Bulletin (SB) listed in Table 1 of this AD to do the inspection. Table 1—Applicable Alert SB for Propeller Type Propeller assembly type Initial inspection within . . . Repeat inspection within . . . Applicable SB (1) R334/4-82-F/13 10 flight hours (FH) time-in-service (TIS) 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 SB No. 61-1119, Revision 5, dated July 1, 2009. (2) R321/4-82-F/8 50 FH TIS after the effective date of this AD 1,000 FH TSLI Alert SB No. 61-A1125, Revision 2, dated August 25, 2010. (3) R324/4-82-F/9 50 FH TIS after the effective date of this AD 1,000 FH TSLI Alert SB No. 61-A1126, Revision 2, dated August 25, 2010. (4) R333/4-82-F/12 50 FH TIS after the effective date of this AD 1,000 FH TSLI Alert SB No. 61-A1124, Revision 2, dated August 25, 2010. (g) 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 Alert SB listed in Table 1 of this AD to do the inspection. Initial Inspection—Previous Credit (h) Propeller hubs, P/N 660709201, that previously passed inspection using Dowty Alert SBs listed in Table 1 of this AD or an earlier issue of those SBs, have satisfied the initial inspection requirements of this AD. However, you must comply with the repetitive inspection requirements found in 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 Alert SB listed in Table 1 of this AD to do the inspection. Optional Terminating Action (j) As optional terminating action for the repetitive inspections required by this AD, replace propeller hub, P/N 660709201, with a new propeller hub, P/N 660717226. Alternative Methods of Compliance (AMOCs) (k) The Manager, Boston Certification Office, has the authority to approve AMOCs for this AD if requested using the procedures found in 14 CFR 39.19. Related Information (l) For more information about this AD, contact Michael Schwetz, Aerospace Engineer, Boston Aircraft Certification Office, FAA, 12 New England Executive Park, Burlington, MA 01803; phone: 781-238-7761; fax: 781-238-7170; e-mail: michael.schwetz@faa.gov. (m) European Aviation Safety Agency 2010-0196R1, dated November 12, 2010, pertains to the subject of this AD. Material Incorporated by Reference (IBR) (n) You must use the following service information to do the actions required by this AD, unless the AD specifies otherwise. The Director of the Federal Register approved the incorporation by reference (IBR) under 5 U.S.C. 552(a) and 1 CFR part 51 of the following service information on the date specified: (1) Dowty Propellers Alert SB No. 61-1119, Revision 5, dated July 1, 2009, approved for IBR as of October 11, 2011. (2) Dowty Propellers Alert SB No. 61-A1124, Revision 2, dated August 25, 2010, approved for IBR as of October 11, 2011. (3) Dowty Propellers Alert SB No. 61-A1125, Revision 2, dated August 25, 2010, approved for IBR as of October 11, 2011. (4) Dowty Propellers Alert SB No. 61-A1126, Revision 2, dated August 25, 2010, approved for IBR as of October 11, 2011. (5) For service information identified in this AD, contact Dowty Propellers, Anson Business Park, Cheltenham Road East, Gloucester GL 29QN, UK; phone: 44 (0) 1452 716000; fax: 44 (0) 1452 716001. (6) You may review copies of the service information at the FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA. For information on the availability of this material at the FAA, call 781-238-7125. (7) You may also review copies of the service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at an NARA facility, call 202-741-6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. Issued in Burlington, Massachusetts, on August 15, 2011. Peter A. White, Manager, Engine & Propeller Directorate, Aircraft Certification Service. [FR Doc. 2011-22566 Filed 9-2-11; 8:45 am] BILLING CODE 4910-13-P

This AD was prompted by the need to introduce an optional terminating action for the repetitive inspections. 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.