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Viking Air SB V6/0067: Revision A

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© Viking Air. Filed by the FAA in regulations.gov docket FAA-2021-0217; AD 2022-10-03 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

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Page 1Open in PDF

Page 1 of 2 ATA Ref. 27-20 26-Jan-2021 Service Bulletin V6/0067

REVISION TRANSMITTAL SHEET RUDDER PEDAL TORQUE TUBE QUADRANT – INSPECTION Service Bulletin No.: V6/0067 Date of Original Issue: 16 Jul 2020 Revision No: A Date of Issue: 26 Jan 2021 This Service Bulletin is issued to notify Operators of findings of loose quadrants and loose or smoking rivets on the rudder pedal torque tube.

This Service Bulletin introduces instructions for detailed visual inspection and check for security.

NOTE 1: NO ACTION IS REQUIRED ON AIRCRAFT INSPECTED TO THE PREVIOUS ISSUE OF THIS SERVICE BULLETIN.

NOTE 2: This revision supersedes the previous revision of this Service Bulletin.

NOTE 3: Revision bars in the left margin of this Service Bulletin indicate changes from the previous revision.

This page transmits Revision ‘A’ of Service Bulletin V6/0067, pages 1 thru 8, dated 26 January 2021.

This Service Bulletin is re-issued to:

1. Introduce Post Mod 6/2496 rudder torque tube assembly part number C6CF1019-5 (and NHA installation part number C6CF1018-S105) as acceptable parts for installation.

2. Establish aircraft effectivity cut-off at MSN 987 (Pre Mod 6/2496).

3. Clarification of inspection procedure with Gust Lock on.

Remove Service Bulletin V6/0067 Revision ‘NC’ dated 16 July 2020 and replace with attached.

Previous issues of Service Bulletin V6/0067:

Initial Issue – Pages 1 thru 6 dated 16 July 2020

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Page 2 of 2 ATA Ref. 27-20 26-Jan-2021 Service Bulletin V6/0067

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1959 de Havilland Way Sidney, B.C.

Canada V8L 5V5 Tel: (250) 656 - 7227

26-Jan-2021 S.B. V6/0067 Revision ‘A’ Page 1 of 8

DHC-6

TWIN OTTER

SERVICE BULLETIN ATA SYSTEM: 27-20 NUMBER: V6/0067

I. PLANNING INFORMATION A. Effectivity Aircraft Affected: DHC-6, Serial Numbers 001 thru 987 (Pre Mod 6/2496).

B. Reason There have been findings of loose quadrants on the rudder pedal torque tube, and signs of loose rivets or rivet joint wear, such as dark areas or streaks around the rivet heads (smoking rivets) and quadrant to torque tube interface for fretting wear products such as black powder.

C. Description Rudder pedal torque tube quadrant is checked for looseness and visually inspected for signs of loose or smoking rivets.

This Service Bulletin is issued to establish a compliance threshold for the initial inspection of the rudder pedal torque tube to quadrant joint. Repeat inspections are to be done in accordance with PSM 1-6-7 inspection schedule.

D. Compliance NOTE: If Service Bulletin V6/0067 Revision ‘NC’ has already been accomplished, Revision ‘A’ of Service Bulletin V6/0067 is considered to be complied with.

Operators shall incorporate the initial inspection of this Service Bulletin before February 17, 2021.

If any rudder pedal torque tube quadrant is found loose, or with signs of loose or smoking rivets, it shall be repaired or replaced before next flight.

E. Approval The technical content of this Service Bulletin has been approved under the authority of Transport Canada Civil Aviation (TCCA) Design Approval Organization (DAO) 04-V-02.

F. Labour Requirements Estimated time to accomplish this Service Bulletin is 1 hour.

SUBJECT: RUDDER PEDAL TORQUE TUBE QUADRANT – INSPECTION

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SERVICE BULLETIN V6/0067

26-Jan-2021 S.B. V6/0067 Revision ‘A’ Page 2 of 8 G. Weight and Balance Not affected.

H. Electrical Load Data Not affected.

I. Publications Affected PSM 1-64-2 Aircraft Maintenance Manual (Series 400) PSM 1-63-2 Aircraft Maintenance Manual (Series 300) PSM 1-63S-2 Aircraft Maintenance Manual (Series 300 Short Nose) PSM 1-6-2 Aircraft Maintenance Manual (Series 1/100/200) J. References This Service Bulletin is self-contained. No drawings are supplied. For more information please contact:

Viking Air Limited FAX: 403-295-8888 Technical Support Telephone Numbers:

7757 8th Street NE Regional: 587-430-0572 Calgary, Alberta North America: 1-800-663-8444 Canada, T2E 8A2 dh_technical.support@vikingair.com II. ACCOMPLISHMENT INSTRUCTIONS A. Inspection of Rudder Peda l Torque Tube Quadrant

1. Locate and open right-hand access panel 15 directly below cockpit (under co-pilot seat) to access the rudder pedal torque tube and quadrant. Refer to Figure 1-2 in PSM 1-6-2, or Chapter 12-00-00 Figure 1 in PSM 1-63-2, 1-63S-2 or 1-64-2, as applicable.

2. Engage the rudder quadrant gust lock by centering the rudder pedals and lifting lever in the floor labelled LIFT FOR GUST LOCK just aft of the left (pilot) side rudder pedals.

3. Hold the rudder torque tube with one hand, then try to rotate the torque tube back and forth to check for any relative rotation (looseness) against the quadrant.

NOTE: There may be some small amount of free play between the gust lock plunger and the mating notch in the quadrant. This is not to be mistaken for looseness between the quadrant and torque tube.

4. NOTE: Two technicians will be required to do the following inspection:

While one technician pushes the rudder pedals back and forth, the other technician physically watches the rudder pedal torque tube to quadrant joint for any sign of relative rotation (looseness).

If any relative rotation is observed, the rudder pedal torque tube to quadrant joint is considered loose.

5. Disengage the rudder quadrant gust lock by lowering lever in floor labelled LIFT FOR LOCK just aft of the pilot side rudder pedals.

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SERVICE BULLETIN V6/0067

26-Jan-2021 S.B. V6/0067 Revision ‘A’ Page 3 of 8

6. Hold the rudder quadrant with one hand and try to move the quadrant laterally (toward left-hand then right-hand direction).

If any relative movement in lateral direction is observed, the rudder pedal torque tube to quadrant joint is considered loose.

7. Use a mirror, flashlight and 10x magnification (or a flexible borescope with light) to do a detailed visual inspection of the rudder torque tube assembly for signs of loose rivets or rivet joint wear, such as dark areas or streaks around the rivet heads or quadrant to torque tube interface for fretting wear product such as black powder.

NOTE: There are 8 blind rivets attaching the quadrant to rudder pedal torque tube.

If rudder torque tube to quadrant joint is loose or there are signs of loose rivets or rivet joint wear/smoking rivets, the rudder pedal torque tube/quadrant assembly shall be repaired or replaced with new or serviceable assembly before next flight. Contact Viking Technical Support for repair disposition, if repair option is selected.

8. Vacuum area. Ensure the area is clean and clear of any swarf, tools, or foreign object debris (FOD).

9. Re-install the access panel opened in step II.A.1. and return the aircraft to service.

10. Complete attached Inspection Reply Form on Page 7 and return to Viking Technical Support.

B. Recording After completion of this Service Bulletin, make the following entry in the aircraft logbook:

“Service Bulletin No. V6/0067 Revision ‘A’ – RUDDER PEDAL TORQUE TUBE QUADRANT – INSPECTION has been incorporated”.

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SERVICE BULLETIN V6/0067

26-Jan-2021 S.B. V6/0067 Revision ‘A’ Page 4 of 8 III. MATERIAL INFORMATION AND TOOLING A. Material Information (Par ts Required Per Aircraft) C6CF1019-1, C6CF1019-3 (Pre Mod 6/2496) or C6CF1019-5 (Mod 6/2496) Torque Tube Assembly (or applicable future superseding part number).

NOTE: Replacement assemblies may have been supplied as spares, with OEM manufacturing part numbers. These OEM manufacturing part number assemblies are supplied with C6CF1022-1 bracket assemblies installed and are otherwise identical to the parts listed above.

C6CF1019-1 or C6CF1019-3 may have been provided as part of OEM manufacturing number assembly C6CF1018-S101.

C6CF1019-5 may have been provided as part of OEM manufacturing number assembly C6CF1018-S105.

B. Tooling – Price and Availability  Flashlight and mirror  10x Magnification glass  Flexible borescope kit with light  Standard aviation hand tools.

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SERVICE BULLETIN V6/0067

26-Jan-2021 S.B. V6/0067 Revision ‘A’ Page 5 of 8 IV. DRAWINGS AND FIGURES

FIGURE 1 – RUDDER PEDAL TORQUE TUBE TO QUADRANT JOINT (EXAMPLE 1 OF LOOSE RIVET INDICATIONS)

Rudder Pedal Torque Tube Quadrant Fretting Indication After Cleaning Dark Streak Indication

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SERVICE BULLETIN V6/0067

26-Jan-2021 S.B. V6/0067 Revision ‘A’ Page 6 of 8

FIGURE 2 –JOINT WEAR AND FRETTING RIVET INDICATIONS (EXAMPLE 2 OF LOOSE RIVET INDICATIONS)

Fretting Indication Joint Wear Indication

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SERVICE BULLETIN V6/0067

26-Jan-2021 S.B. V6/0067 Revision ‘A’ Page 7 of 8 Service Bulletin V6/0067 – Inspection Reply Form Operator: Date of Inspection:

Contact Person:

Contact Phone/Email:

A/C Registration # A/C Serial #

A/C TTSN A/C TCSN

Inspection Findings (Prior to Corrective Actions):

Corrective Actions:

Please return form via email to dh_technical.support@vikingair.com or via fax to 403-295-8888

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SERVICE BULLETIN V6/0067

26-Jan-2021 S.B. V6/0067 Revision ‘A’ Page 8 of 8

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