| DHC-6 | 6/53 | Engine Vibration Isolator Assy. Notification
(All A/C) | Oct 10, 1967 | |
| DHC-6 | 6/529 | Landing Gear - Nose Wheel - Wheel Bearing Seals Impression Stamped on the Wrong Side
(All A/C) | Sep 12, 1997 | |
| DHC-6 | 6/528 | Landing Gear - Main - Inspection of Stay Strut End Fitting for Cotter Pin and Rectification
(All A/C) | Jun 18, 2001 | |
| DHC-6 | 6/527 | Ignition - Installation of Spark Ignition
- Mod 6/1912
(All A/C) | Mar 6, 2000 | Oct 13, 2000 'C' |
| DHC-6 | 6/526 | Navigation - Installation of D.C. Attitude Indicator in Lieu of A.C. Attitude Indicator - SOO 6176
(All A/C) | Jul 6, 2001 | |
| DHC-6 | 6/525 | Wings - Initial Inspection of Wing Assemblies Using Ultrasonic Technique
A/C 001 thru 107 and later aircraft with wing box C6W1002-1, or C6W1002-3 or C6W1002-5 or C6W1002-7 retrofitted.
This service bulletin does not apply to: A/C with Mod 6/1117 incorporated. A/C with Mod 6/1630 incorporated A/C 2 | Sep 6, 1996 | Dec 20, 1996 'A' |
| DHC-6 | 6/524 | Wings - Bottom Skin - Installation of New Fasteners
- Mod 6/1896
(A/C 1 thru 812, 814, 815, 816, 819 and 820 with Mod 6/1752 installed) | Aug 25, 1995 | Feb 7, 1997 'A' |
| DHC-6 | 6/523 | Flight Controls - Special Inspection of Carbon Steel Control Cables for Wear and Corrosion
(All A/C without stainless steel cables
(SOO 6082 or EO 69053) | Aug 4, 1995 | May 10, 1996 'A' |
| DHC-6 | 6/522 | NOT ISSUED | | |
| DHC-6 | 6/521 | Fuselage - Special Inspection of Fuselage Frame at Station 239 for Cracking of Flange
(All A/C) | Jul 7, 1995 | Nov 14, 2005 'B' |
| DHC-6 | 6/520 | Air Conditioning - Cockpit Cooling - Fan Replacement
- Mod 6/1897
(All A/C) | Jun 18, 1997 | |
| DHC-6 | 6/52 | Horizontal Stabilizer - Leading Edge Reinforced to Prevent Ice Damage
Mod. 6/1089
(A/C 1 thru 50) | Oct 16, 1967 | |
| DHC-6 | 6/519 | Engine Controls - Overhead Console - Special Inspection and Replacement of Control Quadrants
Mod 6/1895
(All A/C except Serial Number 462) | Oct 28, 1994 | Jul 18, 2000 'B' |
| DHC-6 | 6/518 | Wings - Inspection of Forward Attachment Adapter Assembly for Installation of Correct Fasteners (and Rectification)
(All A/C with Mods 6/1630 and 6/1859 or 6/1630 and 6/1887. A/C 837 thru 844 with Mod 6/1859 or 6/1887) | Jan 27, 1995 | Jun 23, 1995 'A' |
| DHC-6 | 6/517 | Wings - Lower Skin and Leading Edge Rivets at Front Spar - Inspection and Replacement
Mods. 6/1645 and 6/1893
(All A/C) | Aug 10, 1993 | |
| DHC-6 | 6/516 | Fuselage/Stabilizer - Replacement of Horizontal and Vertical Stabilizer Attachment Adaptors
Mods. 6/1841, 6/1842, 6/1843, 6/1844, 6/1845 and 6/1846
(All A/C) | Aug 14, 1992 | Jan 25, 2000 'C' |
| DHC-6 | 6/515 | Auto Flight - Additional Guard Plate of Aileron Servo Cable Assembly
(All A/C with Electrical Autopilot Installation) | Jan 31, 1992 | |
| DHC-6 | 6/514 | Communications - Installation of New Speaker
(All A/C with S.O.O. 6054 or S.O.O. 6096 (Public Address System) incorporated) | Jan 18, 1991 | |
| DHC-6 | 6/513 | Horizontal Stabilizer - Special Inspection and Rectification of the Forward and Aft Attachment Brackets - Redesigned Retention Method
Mods. 6/1890, 6/1891 and 6/1892 Supersedes S/B 6/475 and Mods. 6/1855 and 6/1856
(A/C with Mods. 6/1808, 6/1809, 6/ 1855 and 6/1856. All A/C Replacing Attachment Brackets for the First Time) | Oct 25, 1991 | Jul 16, 2004 'A' |
| DHC-6 | 6/512 | Horizontal Stabilizer - Special Inspection and Rectification of Centre Hinge Bracket for Cracks
(All A/C) | Oct 25, 1991 | |
