# SERVICE BULLETIN TRANSMITTAL SHEET
DHC - 3 WING BOX INSPECTIO N HOLES IN THE LOWER WING SKIN
Service Bulletin No.: 3 - STC(03 - 50) - 001 Date of Original Issue: 03 - July - 2013 Revision No: NC Date of Issue: 03 - July - 2013
NOTE: This Service Bulletin is associated with Viking Service Bulletin V3/0002. Viking has received SDRs related to cracking of the DHC
- 3 wing upper skin corrugations as well as cracks in the main spa r lower cap. The intent o f this Service Bulletin is to provide proper access to carry out Viking DHC
- 3 Service Bulletin V3/0002 Rev B , which is intended to detect and repair these cracks and to obtain as much information as possible from operators , to evaluate the overall condition of the fleet , to assess if further action is required.

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- 00 03 July 2013 Service Bulletin 3
- STC( 03
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- 0011959 De Havilland Way Sidney, B.C. Canada V8L 5V5 Tel: (250) 656
- 7227 

# SERVICE BULLETIN ATA SYSTEM: 5700 NUMBER: 3 - STC(03 - 50) - 001 (Ref. SB V3/0002) SUBJECT: DHC - 3 Wing Box Inspection Holes in the Lower Wing Skin 

## I. PLANNING INFORMATION A. Effectivity Aircraft Affected: DHC
- 3 Aircraft with only Viking Air STC
- 03
- 50 (9000lb G ross W eight K it) installed. NOTE 1 : Although this Service Bulletin references the Canadian STC number for the Viking Air 9000lb Gross Weight Kit, this document also applies to DHC
3 aircraft with the US STC ( SA02009NY ). NOTE 2: The intent of this S ervice B ulletin is to support the incorporation of Viking SB V3/0002 Rev B wing inspection for aircraft with Viking STC
- 03
- 50 only. It is not intended to be used on wing with other STCs. 

### B. Reason This Service Bulletin was created to inform operators of DHC
- 3 aircraft with the Viking Air 9000lb Gross Weight Kit installed , Viking MOD KIT C3MK1004

– Wing Inspection Access Holes is compatible with their aircraft. This MOD is intended for access through the wing lower skin to assist in the internal wing box inspection required , in accordance with Viking SB V3/0002 , Rev ision B. 

### C. Description This document is intended to be used with SB V3/0002 Rev ision B , which provides operators with a comprehensive inspection program required for DHC
- 3 wings

. 

### D. Compliance Operators shall follow the Compliance times as listed in SB V3/0002 Rev i sion B

. 

# DHC -

3 

# OTTER

03
- July
- 2013 S.B. 3
- STC(03
- 50)
- 001 Revision ‘NC ’ Page 1 of 4

### SE RVICE BULLETIN 3 - STC(03 - 50) - 001 E . Approval The technical content of this Service Bulletin has been approved under the authority of Transport Canada Civil Aviation (TCCA)

. 

### F. Labo r Time Required There is no direct labor associated with this Service Bulletin

. Reference Service Bulletin V3/0002 for labor estimate. 

### G. Weight and Balance Refer to SB V3/0002 Revision B

. H. Electrical Load Data Not affected. 

### I. Publications Affected None. 

### J. References This Service Bulletin is associated with SB V3/0002 - DHC - 3 COMPLETE WING BOX INSPECTION – BORESCOPE AND VISUAL

. 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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### SE RVICE BULLETIN 3 - STC(03 - 50) - 001


## II. ACCOMPLISHMENT INSTRUCTIONS A. INTRODUCTION OF NEW ACCESS HOLES IN LOWER WING SKIN 1. Complete all instructions as listed in Viking Service Bulletin SB V3/0002 Rev ision B except that all mention to MOD KIT 3/1002 must be read as MOD KIT 3/1004 which is the MOD compatible with STC
- 03
- 50 ( SA02009NY)

. 

### B . RECORDING 1. Make an entry in the aircraft flight log book upon completion of the instructions (e.g., Incorporation of access holes d one in accordance with Sec. II A ) would be entered as: “incorporation of SB 3
- STC(03
- 50 )
- 001 DHC
- 3 for MOD KIT C3MK1004 access holes COMPLETED IN ACCORDANCE WITH SECTION II.A AT XX,XXX WING FLIGHT HOURS FOR WING S/N XXX.”



## III. MATERIAL INFORMATION AND TOOLING A. Material

• None 

### B. Tooling – Price and Availability

• None

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- 2013 S.B. 3
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### SE RVICE BULLETIN 3 - STC(03 - 50) - 001

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