Commonwealth legislation

AD/DHC-6/58 - Wing Struts Internal Beam Corrosion

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

The directive requires all De Havilland DHC‑6 (Twin Otter) operators to carry out the inspections/repairs set out in De Havilland Service Bulletin No. 6/474, after the manufacturer reported exfoliation corrosion in internal strut beam flanges. It affects aircraft owners/operators and the maintenance organisations that perform the work, shifting cost, downtime and compliance responsibility to operators while relying on the Service Bulletin for technical detail.

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AD/DHC-6/58 - Wing Struts Internal Beam Corrosion

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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-6/58 Wing Struts Internal Beam Corrosion 9/85

Applicability: All models.

Requirement: Action in accordance with De Havilland Aircraft of Canada Service Bulletin No.

6/474.

Compliance: As per “Requirement” Document.

Background: The manufacturer reports two struts on the same aircraft displaying exfoliation corrosion in the strut beam flanges enclosed by the strut skins.

Source text

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