EASA SIB 2009-37
Model DHC-6 all series —Twin Otter— aeroplanes - Revision of Maintenance Instructions and Introduction of a Flight Control Cable Return Programme.
Summary
EASA Safety Information Bulletin 2009-37 is an informational document addressing Viking Air Limited Model DHC-6 all series "Twin Otter" aeroplanes. It covers revisions to maintenance instructions and introduces a Flight Control Cable Return Programme aimed at improving the inspection and monitoring of flight control cables on these aircraft.
What Changed
The bulletin details updates to the Product Support Manuals with new Temporary Revisions that revise rigging instructions and introduce inspections for elevator and rudder control cables. Additionally, Viking Air Limited has launched a Flight Control Cable Return Programme to track premature removals of control cables before their recommended service life limit.
Why It Matters
This information is important for operators and maintenance organizations to ensure continued airworthiness and safety of the DHC-6 Twin Otter fleet. Proper inspection and reporting of control cable conditions help identify potential issues early, supporting proactive maintenance and compliance with airworthiness requirements.
What To Do
Operators and maintainers of DHC-6 aircraft should review and incorporate the revised maintenance instructions and participate in the Flight Control Cable Return Programme. All replaced flight control cables should be inspected and any damage or corrosion beyond acceptance criteria reported to Viking Air. Compliance with reporting requirements under Commission Regulation (EC) No 2042/2003 is also advised.
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