{"id":"F2006B08902","name":"AD/DH 82/4 - Q Type Harness - Modification","slug":"ad-dh-82-4-q-type-harness-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52419,"registerId":"commonwealth-F2006B08902-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH 82/4 - Q Type Harness - 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)  DH 82 (Tiger Moth) Series Aeroplanes\n\n \n\nAD/DH 82/4 “Q” Type Harness - Modification NK\n\nApplicability: All models equipped with “Q” type safety harnesses.\n\n \n\nRequirement: 1. Modify the harness locking mechanism to prevent the inadvertent operation in flight of the release lever. Designs shall be approved by the Secretary before incorporation.\n\n \n\n2. Approved method of compliance: Department of Civil Aviation Drawing HH 3364\n\n- Page 6; or\n\n \n\n3. ANO 105.1.14.5.5.4.\n\n \n\nCompliance: Forthwith.\n\n![](image.002.png)  \n\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1118},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope: addressing a specific mechanical defect in the 'Q' type harness on DH 82 Tiger Moth aircraft. It has not expanded to cover other harness types, aircraft models, or broader aviation safety issues."},"complexity_factors":["Single, clearly stated requirement","Limited applicability (specific aircraft model and harness type only)","Only two approved methods of compliance specified","No exceptions, nested conditions, or defined terms","Minimal cross-referencing (one drawing reference and one regulation reference)"],"plain_english_summary":"**What this does:** This is a mandatory safety fix for owners of vintage DH 82 Tiger Moth aircraft. It orders the modification of \"Q\" type seatbelt harnesses that have a dangerous design flaw—the release lever could accidentally be bumped during flight, causing the harness to unlock unexpectedly (which would be catastrophic at altitude).\n\n**Who it affects:** Anyone operating a DH 82 Tiger Moth equipped with the \"Q\" type safety harness.\n\n**What must be done:**\n- Modify the harness locking mechanism so the release lever can't be accidentally triggered in flight\n- The modification design must be pre-approved by the Secretary (of the relevant government department)\n- Use the specific technical drawing **Department of Civil Aviation Drawing HH 3364 (Page 6)** as the approved method, or alternatively follow the standard **ANO 105.1.14.5.5.4**\n\n**When:** Immediately (the directive uses the term \"Forthwith\"—meaning no grace period)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-82-4-q-type-harness-modification","history":"/api/acts/ad-dh-82-4-q-type-harness-modification/history","analysis":"/api/acts/ad-dh-82-4-q-type-harness-modification/analysis","conflicts":"/api/acts/ad-dh-82-4-q-type-harness-modification/conflicts","importantCases":"/api/acts/ad-dh-82-4-q-type-harness-modification/important-cases","documents":"/api/acts/ad-dh-82-4-q-type-harness-modification/documents"}}