AD 2011-19-02 Airworthiness Directives; Dowty Propellers Type R212/4-30-4/22 and R251/4-30-4/49 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 R212/4-30-4/22 propeller assemblies with hub and driving center assembly part number (P/N) 601022105, 601022211, 601022294, 601021426, 601021858, or 601021859 installed, and type R251/4-30-4/49 propeller assemblies with hub and driving center assembly P/N 660207202 or P/N 660207203 installed. Reason (d) This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. We are issuing this AD to prevent propeller hub failure due to cracks in the hub, which could result in damage to the airplane.

Unless already done, do the following: (1) Within 500 flight hours after the effective date of this AD, and thereafter at intervals not exceeding 500 flight hours, inspect the buttress threads in the propeller hub and driving center assembly for cracks. (2) Use paragraphs 2.A.(1) through 2.A.(4)(a) of Accomplishment Instructions of Dowty Propellers Alert Service Bulletin No. 61-1043, Revision 7, dated March 1, 2011, and NDT Technique NDT 175U (Appendix A of Dowty Propellers Alert Service Bulletin No. 61-1043, Revision 7, dated March 1, 2011), to do the inspection. (3) If a crack is found, remove the propeller assembly from service before further flight. (4) After the effective date of this AD, do not install this propeller on any airplane unless the propeller hub and driving center has passed the inspections required by this AD. FAA AD Differences (f) This AD differs from the service information as follows: (1) Although the service bulletin tells you to return the affected parts to the manufacturer, this AD does not require that action. (2) Although the service bulletin tells you to submit information to the manufacturer, this AD does not require that action. Alternative Methods of Compliance (AMOCs) (g) The Manager, Boston Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Related Information (h) Refer to MCAI European Aviation Safety Agency AD 2011-0012, dated January 20, 2011, for related information. (i) Contact Michael Schwetz, Aerospace Engineer, Boston Aircraft Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; phone: 781-238-7761; fax: 781-238-7170, e-mail: michael.schwetz@faa.gov for more information about this AD. Material Incorporated by Reference (j) You must use Dowty Propellers Alert Service Bulletin No. 61-1043, Revision 7, dated March 1, 2011, to do the actions required by this AD, unless the AD specifies otherwise. (k) 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. (l) For service information identified in this AD, contact Dowty Propellers, 114 Powers Court, Sterling, VA 20166, phone: 703-421-4434; fax: 703-450-0087. (m) 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 . Issued in Burlington, Massachusetts, on September 7, 2011. Peter A. White, Manager, Engine & Propeller Directorate, Aircraft Certification Service. [FR Doc. 2011-25653 Filed 10-4-11; 8:45 am] BILLING CODE 4910-13-P

Unless already done, do the following: (1) Within 500 flight hours after the effective date of this AD, and thereafter at intervals not exceeding 500 flight hours, inspect the buttress threads in the propeller hub and driving center assembly for cracks. (2) Use paragraphs 2.A.(1) through 2.A.(4)(a) of Accomplishment Instructions of Dowty Propellers Alert Service Bulletin No. 61-1043, Revision 7, dated March 1, 2011, and NDT Technique NDT 175U (Appendix A of Dowty Propellers Alert Service Bulletin No. 61-1043, Revision 7, dated March 1, 2011), to do the inspection. (3) If a crack is found, remove the propeller assembly from service before further flight. (4) After the effective date of this AD, do not install this propeller on any airplane unless the propeller hub and driving center has passed the inspections required by this AD. FAA AD Differences (f) This AD differs from the service information as follows: (1) Although the service bulletin tells you to return the affected parts to the manufacturer, this AD does not require that action. (2) Although the service bulletin tells you to submit information to the manufacturer, this AD does not require that action. Alternative Methods of Compliance (AMOCs) (g) The Manager, Boston Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Related Information (h) Refer to MCAI European Aviation Safety Agency AD 2011-0012, dated January 20, 2011, for related information. (i) Contact Michael Schwetz, Aerospace Engineer, Boston Aircraft Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; phone: 781-238-7761; fax: 781-238-7170, e-mail: michael.schwetz@faa.gov for more information about this AD. Material Incorporated by Reference (j) You must use Dowty Propellers Alert Service Bulletin No. 61-1043, Revision 7, dated March 1, 2011, to do the actions required by this AD, unless the AD specifies otherwise. (k) 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. (l) For service information identified in this AD, contact Dowty Propellers, 114 Powers Court, Sterling, VA 20166, phone: 703-421-4434; fax: 703-450-0087. (m) 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 . Issued in Burlington, Massachusetts, on September 7, 2011. Peter A. White, Manager, Engine & Propeller Directorate, Aircraft Certification Service. [FR Doc. 2011-25653 Filed 10-4-11; 8:45 am] BILLING CODE 4910-13-P