Commonwealth legislation

AD/DHC-6/61 Amdt 1 - Wing Main Spar Lower Cap Angles

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Commonwealth

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legislative instrument

Plain English Summary

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This directive requires all De Havilland DHC‑6 (Twin Otter) aircraft registered in Australia to comply with Transport Canada AD CF‑87‑02 Revision 1 (and the referenced De Havilland service bulletin) with a revised effective date of 11 July 1991. It was issued because of reported exfoliation corrosion in main spar cap lower angles; operators must pay for inspections and corrective work. The amendment removes flight‑hour limits from compliance timing.

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AD/DHC-6/61 Amdt 1 - Wing Main Spar Lower Cap Angles

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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-6/61

Amdt 1

Applicability: All models.

Wing Main Spar Lower Cap Angles 7/91

Requirement: Action in accordance with the Technical Requirements of Transport Canada AD CF- 87-02, R1.

Note: De Havilland SB 6/492 Revision A refers.

Compliance: As specified in the Requirement Document with a revised effective date of 11 July 1991 for Australian registered aircraft.

Background: Exfoliation corrosion in the main spar cap lower angles has been reported on older aircraft. Amendment 1 is raised to reflect a revision of the related Country of origin AD which was issued to remove flight hour limitations from the compliance time requirements.

Source text

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