Commonwealth legislation

AD/AC/90 - Wing Station 39 Wing Ribs

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Commonwealth

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legislative instrument

Plain English Summary

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This directive requires owners/operators of certain Twin Commander 690/690A/690B (s/n 11001–11566) and 685 (s/n 12001–12066) to modify the wing ribs at Wing Station 39 per Twin Commander Service Bulletin 211 Rev 1 Part II, within 50 flight hours after 25 May 1995 or at the next Maintenance Release, whichever comes first.

It’s intended to prevent an under‑strength rib condition; costs, downtime and technical execution fall to operators and their maintenance providers, and the authority may amend the directive later (possible additional inspections).

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AD/AC/90 - Wing Station 39 Wing Ribs

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes

AD/AC/90 Wing Station 39 Wing Ribs 5/95

Applicability: Models 690, 690A, and 690B S/n 11001 to 11566 and Model 685 S/n 12001 to

Requirement: Modify the wing ribs at WS 39 in accordance with Twin Commander Service Bulletin 211 Rev 1 Part II.

Compliance: Within 50 hours’ time in service after 25 May 1995, or at the next inspection for Maintenance Release issue after 25 May 1995, whichever occurs first.

Background: This Directive is issued to prevent an under-strength condition developing in the wing ribs at WS 39, and is part of the requirements of FAA AD 94-04-12.

This Directive will be amended to include the spar cap and stringer inspections of FAA AD 94-04-12, if subsequent information is received indicating that this is necessary.

Source text

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

1 AD/AC/90 - Wing Station 39 Wing Ribs