{"id":"F2006B08953","name":"AD/DH114/41 - Front (Pilots) Seats Restraint Installations - Modification","slug":"ad-dh114-41-front-pilots-seats-restraint-installations-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52513,"registerId":"commonwealth-F2006B08953-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/41 - Front (Pilots) Seats 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)  DH114 (Heron) Series Aeroplanes\n\n \n\nAD/DH114/41 Front (Pilots) Seats Restraint NK\n\nInstallations - Modification\n\n \n\nApplicability: All models.\n\n \n\nRequirement: Modify each front (pilot) seat restraint installation by fitting a safety harness incorporating an inertia reel in accordance with a scheme approved by the Secretary.\n\n \n\nCompliance: Before 1 March 1974.\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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose safety directive focused solely on seat restraint modification for one aircraft type. There is no evidence of scope creep; it does exactly what it says on the tin."},"complexity_factors":["Extremely short document (under 150 words)","No defined terms section","No cross-references to other legislation","Single, unambiguous requirement with clear applicability","No conditional logic or exceptions","Simple compliance deadline with no alternative methods"],"plain_english_summary":"This is an **Airworthiness Directive** — essentially a mandatory safety order issued by Australia's aviation safety regulator (CASA) for a specific type of aircraft.\n\n**What it does:**\nIt requires owners or operators of **DH114 Heron series aeroplanes** (a British-made twin-engine aircraft from the 1950s) to upgrade the pilot seatbelts. Specifically, they must install **safety harnesses with inertia reels** (the kind that automatically tighten during sudden deceleration, like modern car seatbelts) in the front pilot seats.\n\n**Who it affects:**\nAnyone who owns, operates, or maintains a DH114 Heron aircraft in Australia.\n\n**Why it matters:**\nThis is a **life-saving safety upgrade**. The original seat restraints were likely basic lap belts or static harnesses that didn't protect pilots during crashes or severe turbulence. The inertia reel allows freedom of movement during normal flight but locks instantly in an emergency, dramatically reducing the risk of pilot injury or death.\n\n**Key detail:**\nThe modification had to be done using a scheme approved by the Secretary (of the Department of Transport at the time), and the deadline for compliance was **1 March 1974** — meaning this directive is long-expired and only of historical interest unless someone is still flying a vintage Heron under special conditions."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope remains as stated in the instrument: it applies to all DH114 (Heron) series models and requires modification of each front (pilot) seat restraint to include a safety harness with an inertia reel, carried out under a scheme approved by the Secretary and completed by the specified compliance date. The source text does not indicate any change from that original scope."},"complexity_factors":["Clear, single technical requirement (fit a safety harness with inertia reel) reduces procedural complexity.","Applicability to all models simplifies scope but increases total compliance volume.","Regulator discretion: requirement that the modification follow a scheme \"approved by the Secretary\" adds procedural and approval complexity for implementers.","Fixed compliance deadline imposes scheduling pressure and potential operational disruption.","Lack of technical detail in the AD itself forces reliance on external approved scheme documents, adding uncertainty for suppliers and maintainers."],"plain_english_summary":"This AD requires modification of front pilot-seat restraints on all DH114 (Heron) aircraft to fit safety harnesses with inertia reels under a Secretary‑approved scheme, with work required to be completed by 1 March 1974. Aircraft owners/operators must fund and carry out the retrofit and depend on the regulator’s approval for technical details, shifting cost and scheduling burdens to operators while concentrating compliance options through the approval process."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-41-front-pilots-seats-restraint-installations-modification","history":"/api/acts/ad-dh114-41-front-pilots-seats-restraint-installations-modification/history","analysis":"/api/acts/ad-dh114-41-front-pilots-seats-restraint-installations-modification/analysis","conflicts":"/api/acts/ad-dh114-41-front-pilots-seats-restraint-installations-modification/conflicts","importantCases":"/api/acts/ad-dh114-41-front-pilots-seats-restraint-installations-modification/important-cases","documents":"/api/acts/ad-dh114-41-front-pilots-seats-restraint-installations-modification/documents"}}