{"id":"F2006B09133","name":"AD/DHC-6/44 - Lower Wing Skin to Spar Rivets - Inspection","slug":"ad-dhc-6-44-lower-wing-skin-to-spar-rivets-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115686,"registerId":"commonwealth-F2006B09133-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-6/44 - Lower Wing Skin to Spar Rivets - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  DHC-6 (Twin Otter) Series Aeroplanes\n\n \n\nAD/DHC-6/44 Lower Wing Skin to Spar Rivets - Inspection 11/76\n\nApplicability: All models with S/Nos. 1 to 230 inclusive. Document:  De Havilland of Canada SB No. 6/351.\n\nCompliance: Within 100 hours time in service after 31 January 1977.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1556},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope: a targeted safety inspection for specific rivets on specific aircraft models. There is no evidence of scope expansion beyond the original airworthiness safety purpose."},"complexity_factors":["Single, unambiguous mechanical inspection requirement","Limited applicability restricted to specific serial number range (S/Nos. 1-230)","No defined terms, nested exceptions, or conditional logic","Simple compliance calculation (100 hours time-in-service after fixed date)","Minor complexity from external reference to Service Bulletin 6/351 for technical procedures"],"plain_english_summary":"**What this is:** This is an aviation safety directive (called an Airworthiness Directive or AD) issued by the Civil Aviation Safety Authority that mandates a specific mechanical inspection for certain aircraft.\n\n**What it requires:** Owners and operators of De Havilland DHC-6 \"Twin Otter\" aeroplanes with serial numbers 1 through 230 must inspect the rivets that attach the lower wing skin to the wing spar (the main structural beam of the wing).\n\n**Why it matters:** This inspection prevents potential structural failures that could compromise flight safety. The directive references a manufacturer service bulletin indicating potential defects in these specific fasteners.\n\n**Who must comply:** Anyone operating the affected aircraft models within Australian jurisdiction.\n\n**Deadline:** The inspection must be completed within 100 hours of flight time accumulated after 31 January 1977.\n\n**Reference:** Operators must follow the inspection procedures outlined in De Havilland of Canada Service Bulletin No. 6/351."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-6-44-lower-wing-skin-to-spar-rivets-inspection","history":"/api/acts/ad-dhc-6-44-lower-wing-skin-to-spar-rivets-inspection/history","analysis":"/api/acts/ad-dhc-6-44-lower-wing-skin-to-spar-rivets-inspection/analysis","conflicts":"/api/acts/ad-dhc-6-44-lower-wing-skin-to-spar-rivets-inspection/conflicts","importantCases":"/api/acts/ad-dhc-6-44-lower-wing-skin-to-spar-rivets-inspection/important-cases","documents":"/api/acts/ad-dhc-6-44-lower-wing-skin-to-spar-rivets-inspection/documents"}}