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Page 1 of 2 ATA Ref: 55-10 27 May 2014 Service Bulletin V3/0005
SERVICE BULLETIN TRANSMITTAL SHEET
TRIM JACK MOUNTING BLOCK - HORIZONTAL STABILIZER ACTUATOR - INSPECTION Service Bulletin No.: V3/0005 Date of Original Issue: 28 February 2013 Revision No.: Revision A Date of Issue: 27 May 2014 This Service Bulletin notifies operators of an issue where the Horizontal Stabilizer Actuator mounting block has been found to be loose, and also provides operators with an inspection procedure to determine the integrity of the mounting blocks on their aircraft, and an Inspection Reply Form to return to Viking Air describing the results of the inspection.
NOTE 1: NO RETROACTIVE ACTION IS REQUIRED ON AIRCRAFT INSPECTED TO THE PREVIOUS REVISION OF THIS SERVICE BULLETIN.
NOTE 2: This revision supersedes the previous revision of this Service Bulletin.
NOTE 3: Black change bars in the left margin of this Serv ice Bulletin denote changes from the previous revision.
Transmittal Sheet refers to changes made since the previous revision. This Revision is issued to:
1. Improved instructions.
2. Shorten the compliance time.
Previous Revisions of Service Bulletin Number V3/00 05:
Initial Issue - Pages 1 thru 6 dated 28-February-2013.
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1959 De Havilland Way Sidney, B.C. Canada V8L 5V5 Tel: (250) 656 - 7227
SERVICE BULLETIN ATA SYSTEM: 5510 NUMBER: V3/0005 SUBJECT: Trim Jack Mounting Block – Horizontal Stabilizer Actuator - Inspection I. PLANNING INFORMATION A. Effectivity Aircraft Affected: DHC-3 All.
B. Reason The tailplane stabilizer actuator (trim jack) mounting block, (P/N C3FS79-5/-7), was found to be loose in the forward-aft and side-to-side directions. The block is fastened to channel bracket (P/N C3FS78-18) with three AN456AD6-16 rivets (see Figure 1 for location diagram) . The mounting block fastens the stabilizer actuator (trim jack) which allows the incidence of the stabilizer to be varied. The stabilizer actuator (trim jack) also functions as the rear mounting point for the stabilizer.
C. Description This Service Bulletin introduces a one-time inspection of the stabilizer actuator (trim jack) lower mount block for integrity. Access to the affected area is through an access door on the port side between STA 427.38 & 444.38. When required, the inspection instructions may include removal of the stabilizer actuator (trim jack) to check the security of the block. Operators are asked to report their finding s to the Viking Air Limited Technical Support Desk – see Sec. I.J for contact information.
D. Compliance Unless previously carried out per SB V3/0005 Rev “NC”, operators shall accomplish the inspection detailed in this Service Bulletin within 100 flight hours or within 90 days of the issue date of this Service Bulletin, whichever comes first.
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.
DHC-3 Otter
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SERVICE BULLETIN V3/0005
F. Manpower An estimated 3 man-hours will be required to complete the inspection activities of this Service Bulletin.
G. Weight and Balance None.
H. Electrical Load Data Not affected.
I. Publications Affected None.
J. References This Service Bulletin contains a Survey to be completed and returned to Viking. No drawings are supplied. For more information please contact:
Viking Air Limited Technical Support 1959 De Havilland Way Sidney, British Columbia V8L 5V5 technical.support@vikingair.com FAX: 250-656-0673 Telephone Numbers:
Regional: 250-656-7227 North America: 1-800-663-8444 International: 1-800-6727-6727
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SERVICE BULLETIN V3/0005 II. ACCOMPLISHMENT INSTRUCTIONS A. INSPECTION PROCEDURE (Ref. Figure 1)
1. Using the hand wheel in the cockpit, wind stabilizer to full nose up position. Visually confirm that the trim is fully extended.
2. Remove stabilizer actuator (trim jack) access cover and horizontal stabilizer fairings on both sides. Refer to PSM 1-3-2 para. 2.27.1 for access instructions.
3. With stabilizer safely supported:
a. Relieve cable tension in accordance with PSM 1-3-2 para. 2.27.1.d.
b. Remove stabilizer actuator (trim jack) upper attachment bolt being careful not to disturb cables.
c. Disengage the upper end of the stabilizer actuator (trim jack) by moving it forward or aft away from the upper attachment fitting.
d. Grip the upper end of the stabilizer actuator (trim jack) and lightly attempt to move it side-to-side. Grip the lower end of the stabilizer actuator (trim jack) and attempt to move it fore and aft as well as up and down with sufficient force to assess whether the lower trim jack mount block requires further inspection.
e. With the aid of a bright flash light, mirror or boroscope, visually inspect the stabilizer actuator (trim jack) mounting block (P/N C3FS79-5/-7) and the channel bracket (P/N C3FS78-18) for:
• Loose, broken, missing or corroded fasteners;
• Fretting, working or wear marks around fastener heads;
• Elongated or corroded fastener holes;
• Cracking or corrosion on the remaining-accessible area of stabilizer actuator (trim jack) mounting block (P/N C3FS79-5/-7) and the channel bracket (P/N C3FS78-18).
4. If NO motion, looseness, defects or other abnormality is found, reinstall the stabilizer actuator (trim jack) upper attachment bolt per 2.27.5.c. Re-apply cable tension in accordance with PSM 1-3-2 para. 2.27.5.h. Reassemble the removed access cover and horizontal stabilizer fairings
5. If any motion, looseness, defects or other abnormality is detected, remove the stabilizer actuator (trim jack ) in accordance with PSM 1- 3-2 para. 2.27. 1 and investigate the lower trim jack mount block (P/N C3FS79-5/-7) as well as the mounting bracket (P/N C3FS78-18) to find the root cause on the source of motion, looseness or defect.
6. If any movement or other abnormality is found, contact Viking Technical Support prior to further flight, to report details of the findings and repair options.
7. In all cases, complete the attached survey form and return it to Viking Technical Support.
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SERVICE BULLETIN V3/0005 B. RECORDING On completion of this Service Bulletin, make the following entry in aircraft log book:
“Service Bulletin No. V3/0005 – HORIZONTAL STABILIZER ACTUATOR (TRIM JACK) – INSPECTION has been incorporated”.
III. MATERIAL INFORMATION AND TOOLING A. Material None B. Tooling – Price and Availability
(a) Standard aircraft maintenance hand tools
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SERVICE BULLETIN V3/0005 IV. TABLES AND FIGURES
FIGURE 1 – TRIM JACK MOUNTING BLOCK LOCATION
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SERVICE BULLETIN V3/0005 Service Bulletin V3/0005 – Operator Reply Form Operator Name:
Contact Person:
Contact Phone/Email:
A/C Registration No.: A/C Serial No.:
A/C TTSN: A/C TCSN:
Inspection Findings:
Additional Comments:
Please return form via email to technical.support@vikingair.com or via fax to 250-656-0673
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