Commonwealth legislation

AD/DHC-6/64 - Elevator Pushrod Ball Ends

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

This airworthiness directive (Civil Aviation Safety Authority) requires removal of specific elevator pushrods (P/N C6CF1466-1 or C6CF1141-1) from DHC‑6 Twin Otters and inspection of both rod ends for corrosion, damage, free rotation and cracks per Transport Canada Emergency AD CF‑90‑10. It must be done within 25 flight hours or five days after 14 May 1990 (unless already inspected within 21 days). Operators bear the costs and short-term downtime to mitigate risk of in‑service pushrod failure.

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AD/DHC-6/64 - Elevator Pushrod Ball Ends

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source DHC-6 (Twin Otter) Series Aeroplanes

AD/DHC-6/64 Elevator Pushrod Ball Ends 7/90

Applicability: All models.

Requirement: Remove the pushrods (P/N C6CF 1466-1 or C6CF 1141-1) from the aircraft. Remove the rod ends from both ends of the pushrod and inspect for corrosion, damage, freedom of rotation and cracks, in accordance with Transport Canada Emergency AD CF-90-10.

Compliance: Within the next 25 hours time in service or five days, whichever occurs first, after 14 May 1990, unless accomplished within the previous 21 days.

Background: Fatigue failure of an elevator pushrod ball end has occurred in service. It is suspected that the cause may have been related to seizure of the ball and/or bending or misalignment.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.