# Viking Air Service Bulletin V6/0022: Revision B - Rights: © Viking Air. Filed by the FAA in regulations.gov docket FAA-2017-1038; AD 2018-04-02 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Viking Air Service Bulletin V6/0022](https://openairdocs.org/service-documents/viking/v6-0022.md) - Title as filed: SB V6 0022 - Pages: 8 - PDF: https://openairdocs.org/files/sha256/7d/dc/7ddcbf9e78e624c5f6fd1432c0de7043b87b2ea82a28acdb9617686cc5b304e9 - Page: https://openairdocs.org/service-documents/viking/v6-0022/file/7ddcbf9e78e6 ## Text Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 Page 1 of 2 ATA Ref: 27-10 13 June 2014 Service Bulletin V6/0022 SERVICE BULLETIN TRANSMITTAL SHEET AILERON CABLES FOULING AT WING ROOT RIB FAIRLEAD AND AT FUSELAGE SKIN INSPECTION Service Bulletin No.: V6/0022 Date of Original Issue: 4 February 2013 Revision No.: Revision B Date of Issue: 2 June 2014 Possibility of aileron cable rubbing on fuselage skin cut-out. Also possibility of abnormal wear due to excessive pressure on wing root fairlead. Visually inspect for cable rubbing or fouling on fuse lag e skin cut-out and wing fairlead. Also locally inspect for cable condition. This is a one time Inspection. NOTE 1: This Service Bulletin Revision contains inspections that were not required at revision NC or revision A. NOTE 2: This revision supersedes the previous revision of th is Service Bulletin. NOTE 3: Black change bars in the left margin of this Ser vice Bulletin denote changes from the previous revision. Transmittal Sheet refers to changes made since the previous revision. This Revision is issued to: 1. Incorporated a repeat inspection every 500 flight hrs. Previous Revisions of Service Bu lletin Number V6/0022: Initial Issue - Pages 1 thru 6 dated 04-February-2013. Revision A - Pages 1 thru 6 dated 02-April-2014. ### Page 2 Page 2 of 2 ATA Ref: 27-10 13 June 2014 Service Bulletin V6/0022 THIS PAGE INTENTIONALLY LEFT BLANK ### Page 3 13 June 2014 S.B. V6/0022 Revision ‘B’ Page 1 of 6 1959 de Havilland Way Sidney, B.C. Canada V8L 5V5 Tel.: (250) 656-7227 DHC-6 Twin Otter SERVICE BULLETIN ATA SYSTEM: 27-10 Number: V6/0022 I. PLANNING INFORMATION A. Effectivity Aircraft Affected: All DHC-6. B. Reason Possibility of aileron cable wear on fuselage skin cut-out or on wing root rib fairlead. C. Description Visually inspect cable for wear, fouling on fuselage skin cut-out and wing root rib fairlead, or fraying of cable from the root rib fairlead. D. Compliance 1. For aileron cables with less than 250 ac cumulated flight hours in-service or for new replacement cables, inspect in accordance with this Service Bulletin at the following intervals: a. Complete a first inspection once the cable as accumulated between 250 and 300 flight hours in-service, b. Do four (4) consecutive additional inspec tions at every 500 flight hours before returning to the existing 1000 flight hours inspection for each cable. 2. For aileron cables with 250 or more accumulated flight hours in-service, inspect in accordance with this Service Bulletin at intervals indicated below: a. Complete a first inspection within 50 flight of this Service Bulletin, or the current scheduled inspection in accordance PSM1-6-7, whichever comes first. b. Do four (4) consecutive additional inspec tions at every 500 flight hours before returning to the existing 1000 flight hours inspection for each cable. 3. Following each inspection, operators shall complete the attached inspection report and submit it to Viking Technical Support as per in Section I.J. of this Service Bulletin. 4. At any C Checks subsequent to paragraph I.D.2.b., report any abnormal or premature wear directly to Viking Technical Support. E. Approval The technical content of this Service Bulletin has been approved under the authority of the Transport Canada Civil Aviation (TCCA) Design Approval Organization (DAO) 04-V-02. SUBJECT: AILERON CABLES FOULING AT WING ROOT RIB FAIRLEAD AND AT FUSELAGE SKIN - INSPECTION. ### Page 4 SERVICE BULLETIN V6/0022 13 June 2014 S.B. V6/0022 Revision ‘B’ Page 2 of 6 F. Manpower It is estimated to take 4 man-hours to complete this Service Bulletin. G. Weight and Balance Not affected. H. Electrical Load Data Not affected. I. Publications Affected Not affected. J. References Note: This Service Bulletin is self-contained. No drawings are supplied. For more information please contact: Viking Air Limited FAX: 250-656-0673 Technical Support Telephone Numbers: 1959 de Havilland Way Regional: 250-656-7227 Sidney, British Columbia North America: 1-866-49-ATLAS Canada, V8L 5V5 International: 1-800-6727-6727 technical.support@vikingair.com II. ACCOMPLISHMENT INSTRUCTIONS Note: This procedure is for the left and right side. A. Preparation (Refer to Figure 1) 1. Gain access to the area as follows: (a) Remove the upper aft and forward fairings. (b) Inspect routing as indicated in step II.B. B. Inspection (Refer to Figure 2) Note: This inspection is for the LH and RH sides. 1. Visually inspect cable for rubbing and fouling on fuselage skin cut-out. 2. Visually inspect cable for wear and fouling at wing fairlead. 3. Ensure to inspect the cable over the full range of control motion. 4. Using a lint-free cloth inspect the cable to ensure there is no broken strand (refer to the Aircraft Maintenance Manual for thorough cable inspection method). 5. If cables are damaged beyond the limits, in accordance with the Aircraft Maintenance Manual, replace damaged cables before next flight. 6. Record findings on the attached inspection sheet. 7. Send the inspection report to Viking Air Limited. 8. If cable damage is found, contact Viking Te chnical Support for additional instructions. C. Close-out (refer to Figure 1) ### Page 5 SERVICE BULLETIN V6/0022 13 June 2014 S.B. V6/0022 Revision ‘B’ Page 3 of 6 1. Make sure that the area is clean and clear of unwanted objects. 2. Install the upper aft and forward fairings. D. Recording On completion of this Service Bulletin, make the following entry in the aircraft log book: “Service Bulletin No. V6/0022 - AILERO N CABLES FOULING AT WING ROOT FAIRLEAD AND AT FUSELAGE SKIN - INSPECTION has been incorporated”. III. MATERIAL INFORMATION AND TOOLING E. Tooling • Standard mechanic tools. ### Page 6 SERVICE BULLETIN V6/0022 13 June 2014 S.B. V6/0022 Revision ‘B’ Page 4 of 6 IV. TABLES AND FIGURES Figure 1 Upper Aft Fairing Upper Fwd Fairing ### Page 7 SERVICE BULLETIN V6/0022 13 June 2014 S.B. V6/0022 Revision ‘B’ Page 5 of 6 Figure 2 ### Page 8 SERVICE BULLETIN V6/0022 13 June 2014 S.B. V6/0022 Revision ‘B’ Page 6 of 6 Service Bulletin V6/0022 - Inspection Report Operator: _______________________________________________________________ Contact Person: ____ _____________________________________________________ Contact Phone/Email: ___________________________ _________________________ A/C Registration #______________________ A/C Serial # ________________________ A/C TTSN _____________________________ A/C TCSN _________________________ LH Wing Serial # _________________TTSN _______________ TCSN ______________ RH Wing Serial # _________________TTSN _______________ TCSN ______________ LH Cable P/N LH________________________TTSN ___________ TCSN ____________ RH Cable P/N RH________________________TTSN ___________ TCSN ____________ Inspection Findings: _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ Broken Cable Strands Found on LH Cable? __________________________________________ Broken Cable Strands Found on RH Cable? _________________________________________ Please return form via email to technical.support@vikingair.com or via fax to 250-656-0673 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.