{"id":"F2006B09117","name":"AD/DHC-6/3 - Airstair Door Safety Guard - Modification","slug":"ad-dhc-6-3-airstair-door-safety-guard-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115670,"registerId":"commonwealth-F2006B09117-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-6/3 - Airstair Door Safety Guard - Modification","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-6/3  Airstair Door Safety Guard - Modification 7/67 Applicability:              All models with S/Nos. 1 to 60, excluding Nos. 25 and 30, fitted with an airstair door. Document:               De Havilland of Canada Mod. Bulletin 6/1068.\n\nCompliance: Before 1 September 1971.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2028},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original targeted scope: a specific physical modification for early-production DHC-6 aircraft equipped with airstair doors."},"complexity_factors":["Narrow applicability limited to specific aircraft serial numbers (1-60) with two explicit exclusions (25 and 30)","Single, unambiguous compliance action referring to one external technical standard","No conditional provisions, exceptions, or cross-references to other legislative instruments"],"plain_english_summary":"**What this does:** This safety directive requires owners or operators of specific De Havilland DHC-6 Twin Otter aircraft to install a safety guard on the airstair door (the plane's built-in staircase).\n\n**Who it affects:** Aircraft with serial numbers 1 through 60, **except** serial numbers 25 and 30, that are equipped with an airstair door.\n\n**What must be done:** Install the safety guard modification exactly as described in **De Havilland of Canada Modification Bulletin 6/1068**.\n\n**Why it matters:** The guard prevents injuries that could occur if the door operates unexpectedly or if someone contacts the door mechanism during entry or exit.\n\n**Deadline:** The modification should have been completed before 1 September 1971."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-6-3-airstair-door-safety-guard-modification","history":"/api/acts/ad-dhc-6-3-airstair-door-safety-guard-modification/history","analysis":"/api/acts/ad-dhc-6-3-airstair-door-safety-guard-modification/analysis","conflicts":"/api/acts/ad-dhc-6-3-airstair-door-safety-guard-modification/conflicts","importantCases":"/api/acts/ad-dhc-6-3-airstair-door-safety-guard-modification/important-cases","documents":"/api/acts/ad-dhc-6-3-airstair-door-safety-guard-modification/documents"}}