AD 2008-13-11 Airworthiness Directives; Viking Air Limited Models DHC-6-1, DHC-6-100, DHC-6-200, and DHC-6-300 Airplanes

Models named: DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Models DHC-6-1, DHC-6-100, DHC-6-200, and DHC-6-300 airplanes, serial numbers (SNs) 001 through 844, certificated in any category.

Unless already done, do the following actions: (1) Within the next 90 days after August 5, 2008 (the effective date of this AD), develop a schedule for doing the initial and repeat CTs required in paragraph (f)(2) and (f)(3) of this AD. (2) Initially, do all of the seven basic CTs defined at paragraph 3.0 of Part 3 of DHC-6 Twin Otter (Series 100/200/300) Corrosion Prevention and Control Manual PSM 1-6-5, Revision 3, released and dated January 15, 2007 (individual pages dated as specified in the List of Effective Pages on pages 7 through 12 of the document); and the temporary revisions listed in Table 1— Viking Temporary Revisions , of this AD: Table 1.—Viking Temporary Revisions Temporary revision number and date (i) Viking Temporary Revision, C57-10-18 (TR 2-2), dated December 19, 2007. (ii) Viking Temporary Revision, Part 3, Supplement 1 (TR 3-2), dated December 19, 2007. (iii) Viking Temporary Revision, Part 3, Supplement 1 (TR 3-3), dated December 19, 2007. (iv) Viking Temporary Revision, Part 3, Supplement 1, (TR 3-4), dated December 19, 2007. Determine corrosion level following the definitions contained in the introduction section of DHC-6 Twin Otter (Series 100/200/300) Corrosion Prevention and Control Manual PSM 1-6-5, Revision 3, released and dated January 15, 2007 (individual pages dated as specified in the List of Effective Pages on pages 7 through 12 of the document). The initial accomplishment deadlines are specified in Table 2— Initial Accomplishment Deadline , of this AD: Table 2.—Initial Accomplishment Deadline Applicable airplane serial numbers Initial accomplishment deadline for all airplanes in applicable S/N range (i) 001 through 199 15 months after August 5, 2008 (the effective date of this AD). (ii) 200 through 439 27 months after August 5, 2008 (the effective date of this AD). (iii) 440 through 659 51 months after August 5, 2008 (the effective date of this AD). (iv) 660 through 844 63 months after August 5, 2008 (the effective date of this AD). (3) After the initial completion of each CT, repeat each CT at the repeat interval (R) specified in the manual. Determine corrosion level following the definitions contained in the introduction section of DHC-6 Twin Otter (Series 100/200/300) Corrosion Prevention and Control Manual PSM 1-6-5, Revision 3, released and dated January 15, 2007 (individual pages dated as specified in the List of Effective Pages on pages 7 through 12 of the document). (4) If any corrosion is found during any action required by this AD, before further flight, address corrosion following paragraph 4.0 of Part 3 of DHC-6 Twin Otter (Series 100/200/300) Corrosion Prevention and Control Manual PSM 1-6-5, Revision 3, dated January 15, 2007. All repairs are to be done following a method approved by the Manager, New York Aircraft Certification Office or Transport Canada Civil Aviation (or its delegated agent). (5) Within 21 days after the finding of Level 3 corrosion, submit a plan to the FAA to identify a schedule for accomplishing the applicable CTs on the remainder of the airplanes in the operator's fleet that are subject to this AD or data substantiating that the Level 3 corrosion that was found is an isolated case. The FAA may impose a schedule other than proposed in the plan upon finding that a change to the schedule is needed to assure that any other Level 3 corrosion is detected in a timely manner. For the purposes of this paragraph, the FAA is defined as the cognizant principal maintenance inspector (PMI) for operators that are assigned a PMI (e.g., part 121, 125, and 135 operators) and the cognizant flight standards district office for other operators (e.g., part 91 operators). (6) If any Level 3 corrosion is found while doing any action required by this AD, within 21 days after the finding of Level 3 corrosion, report the finding on the form in Figure 1 of this AD and send it to Viking Air Limited, VP Engineering, 9574 Hampden Road, Sidney, British Columbia, Canada V8L 5V5. (7) Incorporation of the initial and repeat CTs into your FAA-approved maintenance program constitutes terminating action for this AD. If this AD is terminated in this way, then the maintenance program must be in accordance with this AD. FAA AD Differences Note: This AD differs from the MCAI and/or service information as follows: No differences. Other FAA AD Provisions (g) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Richard Beckwith, Aerospace Engineer, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone: (516) 228-7302; fax: (516) 568-2716. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate PMI in the FAA Flight Standards District Office (FSDO), or lacking a PMI, your local FSDO. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. (3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq .), the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120-0056. AD 2008-13-11 INSPECTION REPORT (REPORT ONLY IF YOU FIND LEVEL 3 CORROSION)     1. Operator: 2. Telephone: 3. Airplane Model Number: 4. Airplane Serial Number: 5. Airplane Tail Number: 6. Date of Inspection: 7. Corrosion Task:         8. Description & Specific Location of Findings:         9. Additional Comments of Owner/Operator:         Send to:   Viking Air Limited VP Engineering 9574 Hampden Road Sidney, British Columbia, Canada V8L 5V5     Telephone: 250.656.7227 Fax: 250.656.9702       Figure 1. Related Information (h) Refer to MCAI Transport Canada AD No. CF-94-12R1, dated April 13, 1999; Transport Canada AD No. CF-99-11, dated May 28, 1999; DHC-6 Twin Otter (Series 100/200/300) Corrosion Prevention and Control Manual PSM 1-6-5, Revision 3, dated January 15, 2007; and the temporary revisions listed in Table 1— Viking Temporary Revisions, of this AD, for related information. Material Incorporated by Reference (i) You must use the service information specified in Table 3— Material Incorporated by Reference, of this AD 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 Viking Air Limited, VP Engineering, 9574 Hampden Road, Sidney, British Columbia, Canada V8L 5V5; Telephone: 250.656.7227; Fax: 250.656.9702. (3) You may review copies at the FAA, Central Region, Office of the Regional Counsel, 901 Locust, Room 506, Kansas City, Missouri 64106; 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 3.—Material Incorporated by Reference Service Bulletin No. Pages Revision Date (i) DHC-6 Twin Otter (Series 100/200/300) Corrosion Prevention and Control Manual PSM 1-6-5 1 through 304 Revision 3 Released and dated January 15, 2007 (individual pages dated as specified in the List of Effective Pages on pages 7 through 12 of the document). (ii) Viking Temporary Revision, C57-10-18 (TR 2-2) 1 through 3 Temporary Revision No.: 2-2 December 19, 2007. (iii) Viking Temporary Revision, Part 3, Supplement 1 (TR 3-2) 1 through 2 Temporary Revision No.: 3-2 December 19, 2007. (iv) Viking Temporary Revision, Part 3, Supplement 1 (TR 3-3) 1 through 2 Temporary Revision No.: 3-3 December 19, 2007. (v) Viking Temporary Revision, Part 3, Supplement 1, (TR 3-4) 1 through 2 Temporary Revision No.: 3-4 December 19, 2007. Issued in Kansas City, Missouri, on June 12, 2008. Kim Smith, Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. E8-13848 Filed 6-30-08; 8:45 am] BILLING CODE 4910-13-P

Unless already done, do the following actions: (1) Within the next 90 days after August 5, 2008 (the effective date of this AD), develop a schedule for doing the initial and repeat CTs required in paragraph (f)(2) and (f)(3) of this AD. (2) Initially, do all of the seven basic CTs defined at paragraph 3.0 of Part 3 of DHC-6 Twin Otter (Series 100/200/300) Corrosion Prevention and Control Manual PSM 1-6-5, Revision 3, released and dated January 15, 2007 (individual pages dated as specified in the List of Effective Pages on pages 7 through 12 of the document); and the temporary revisions listed in Table 1— Viking Temporary Revisions , of this AD: Table 1.—Viking Temporary Revisions Temporary revision number and date (i) Viking Temporary Revision, C57-10-18 (TR 2-2), dated December 19, 2007. (ii) Viking Temporary Revision, Part 3, Supplement 1 (TR 3-2), dated December 19, 2007. (iii) Viking Temporary Revision, Part 3, Supplement 1 (TR 3-3), dated December 19, 2007. (iv) Viking Temporary Revision, Part 3, Supplement 1, (TR 3-4), dated December 19, 2007. Determine corrosion level following the definitions contained in the introduction section of DHC-6 Twin Otter (Series 100/200/300) Corrosion Prevention and Control Manual PSM 1-6-5, Revision 3, released and dated January 15, 2007 (individual pages dated as specified in the List of Effective Pages on pages 7 through 12 of the document). The initial accomplishment deadlines are specified in Table 2— Initial Accomplishment Deadline , of this AD: Table 2.—Initial Accomplishment Deadline Applicable airplane serial numbers Initial accomplishment deadline for all airplanes in applicable S/N range (i) 001 through 199 15 months after August 5, 2008 (the effective date of this AD). (ii) 200 through 439 27 months after August 5, 2008 (the effective date of this AD). (iii) 440 through 659 51 months after August 5, 2008 (the effective date of this AD). (iv) 660 through 844 63 months after August 5, 2008 (the effective date of this AD). (3) After the initial completion of each CT, repeat each CT at the repeat interval (R) specified in the manual. Determine corrosion level following the definitions contained in the introduction section of DHC-6 Twin Otter (Series 100/200/300) Corrosion Prevention and Control Manual PSM 1-6-5, Revision 3, released and dated January 15, 2007 (individual pages dated as specified in the List of Effective Pages on pages 7 through 12 of the document). (4) If any corrosion is found during any action required by this AD, before further flight, address corrosion following paragraph 4.0 of Part 3 of DHC-6 Twin Otter (Series 100/200/300) Corrosion Prevention and Control Manual PSM 1-6-5, Revision 3, dated January 15, 2007. All repairs are to be done following a method approved by the Manager, New York Aircraft Certification Office or Transport Canada Civil Aviation (or its delegated agent). (5) Within 21 days after the finding of Level 3 corrosion, submit a plan to the FAA to identify a schedule for accomplishing the applicable CTs on the remainder of the airplanes in the operator's fleet that are subject to this AD or data substantiating that the Level 3 corrosion that was found is an isolated case. The FAA may impose a schedule other than proposed in the plan upon finding that a change to the schedule is needed to assure that any other Level 3 corrosion is detected in a timely manner. For the purposes of this paragraph, the FAA is defined as the cognizant principal maintenance inspector (PMI) for operators that are assigned a PMI (e.g., part 121, 125, and 135 operators) and the cognizant flight standards district office for other operators (e.g., part 91 operators). (6) If any Level 3 corrosion is found while doing any action required by this AD, within 21 days after the finding of Level 3 corrosion, report the finding on the form in Figure 1 of this AD and send it to Viking Air Limited, VP Engineering, 9574 Hampden Road, Sidney, British Columbia, Canada V8L 5V5. (7) Incorporation of the initial and repeat CTs into your FAA-approved maintenance program constitutes terminating action for this AD. If this AD is terminated in this way, then the maintenance program must be in accordance with this AD. FAA AD Differences Note: This AD differs from the MCAI and/or service information as follows: No differences. Other FAA AD Provisions (g) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Richard Beckwith, Aerospace Engineer, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone: (516) 228-7302; fax: (516) 568-2716. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate PMI in the FAA Flight Standards District Office (FSDO), or lacking a PMI, your local FSDO. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. (3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq .), the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120-0056. AD 2008-13-11 INSPECTION REPORT (REPORT ONLY IF YOU FIND LEVEL 3 CORROSION)     1. Operator: 2. Telephone: 3. Airplane Model Number: 4. Airplane Serial Number: 5. Airplane Tail Number: 6. Date of Inspection: 7. Corrosion Task:         8. Description & Specific Location of Findings:         9. Additional Comments of Owner/Operator:         Send to:   Viking Air Limited VP Engineering 9574 Hampden Road Sidney, British Columbia, Canada V8L 5V5     Telephone: 250.656.7227 Fax: 250.656.9702       Figure 1. Related Information (h) Refer to MCAI Transport Canada AD No. CF-94-12R1, dated April 13, 1999; Transport Canada AD No. CF-99-11, dated May 28, 1999; DHC-6 Twin Otter (Series 100/200/300) Corrosion Prevention and Control Manual PSM 1-6-5, Revision 3, dated January 15, 2007; and the temporary revisions listed in Table 1— Viking Temporary Revisions, of this AD, for related information. Material Incorporated by Reference (i) You must use the service information specified in Table 3— Material Incorporated by Reference, of this AD 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 Viking Air Limited, VP Engineering, 9574 Hampden Road, Sidney, British Columbia, Canada V8L 5V5; Telephone: 250.656.7227; Fax: 250.656.9702. (3) You may review copies at the FAA, Central Region, Office of the Regional Counsel, 901 Locust, Room 506, Kansas City, Missouri 64106; 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 3.—Material Incorporated by Reference Service Bulletin No. Pages Revision Date (i) DHC-6 Twin Otter (Series 100/200/300) Corrosion Prevention and Control Manual PSM 1-6-5 1 through 304 Revision 3 Released and dated January 15, 2007 (individual pages dated as specified in the List of Effective Pages on pages 7 through 12 of the document). (ii) Viking Temporary Revision, C57-10-18 (TR 2-2) 1 through 3 Temporary Revision No.: 2-2 December 19, 2007. (iii) Viking Temporary Revision, Part 3, Supplement 1 (TR 3-2) 1 through 2 Temporary Revision No.: 3-2 December 19, 2007. (iv) Viking Temporary Revision, Part 3, Supplement 1 (TR 3-3) 1 through 2 Temporary Revision No.: 3-3 December 19, 2007. (v) Viking Temporary Revision, Part 3, Supplement 1, (TR 3-4) 1 through 2 Temporary Revision No.: 3-4 December 19, 2007. Issued in Kansas City, Missouri, on June 12, 2008. Kim Smith, Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. E8-13848 Filed 6-30-08; 8:45 am] BILLING CODE 4910-13-P