{"id":"F2006B08911","name":"AD/DH 87/1 - Seat Restraint Installations - Modification","slug":"ad-dh-87-1-seat-restraint-installations-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52446,"registerId":"commonwealth-F2006B08911-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH 87/1 - Seat Restraint Installations - 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 87 (Hornet Moth) Series Aeroplanes\n\n \n\nAD/DH 87/1 Seat Restraint Installations - Modification 11/82\n\nApplicability: All models.\n\n \n\nRequirement: Modify each seat restraint installation by fitting a safety harness in accordance with a scheme approved by the Secretary.\n\n \n\nNote: Guidelines for installation schemes are outlined in Airworthiness Advisory Circular No. 62 dated March 1972 and amendment to Airworthiness Advisory Circular No. 62 as issued with No. 63.\n\n \n\nCompliance: Unless already accomplished, before 1 March 1983.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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":2774},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original, narrow scope. It imposes a specific safety requirement regarding seat harness installation for DH 87 aircraft only and has not expanded to cover additional aircraft types or unrelated safety systems."},"complexity_factors":["Narrow applicability limited to a single aircraft type (DH 87 Hornet Moth)","Single operative requirement with no nested exceptions or conditional clauses","Reliance on external technical documents (Airworthiness Advisory Circulars) for detailed specifications rather than prescribing them within the directive text"],"plain_english_summary":"**What this is**\n\nThis is an Airworthiness Directive — a mandatory safety rule issued by the Civil Aviation Safety Authority for owners and operators of DH 87 Hornet Moth aeroplanes (a vintage, single-engine biplane).\n\n**What you must do**\n\nYou must modify the aircraft's seat restraints by fitting a proper safety harness (a restraint system that secures the occupant with straps across the shoulders and torso, not just a lap belt) for each seat.\n\n**How to comply**\n\nThe installation must follow a specific scheme that has been formally approved by the Secretary (the relevant government aviation official). For technical guidance on how to design and approve this scheme, see Airworthiness Advisory Circular No. 62 and its amendment in Circular No. 63.\n\n**Why this matters**\n\nThis ensures pilots and passengers are securely restrained during turbulence or emergency situations, significantly improving safety compared to basic lap belts."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-87-1-seat-restraint-installations-modification","history":"/api/acts/ad-dh-87-1-seat-restraint-installations-modification/history","analysis":"/api/acts/ad-dh-87-1-seat-restraint-installations-modification/analysis","conflicts":"/api/acts/ad-dh-87-1-seat-restraint-installations-modification/conflicts","importantCases":"/api/acts/ad-dh-87-1-seat-restraint-installations-modification/important-cases","documents":"/api/acts/ad-dh-87-1-seat-restraint-installations-modification/documents"}}