{"id":"F2006B08870","name":"AD/DH 104/28 - Engine Mounting Attachment Fittings - Inspection","slug":"ad-dh-104-28-engine-mounting-attachment-fittings-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52291,"registerId":"commonwealth-F2006B08870-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH 104/28 - Engine Mounting Attachment Fittings - 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)  DH 104 (Dove) Series Aeroplanes\n\n \n\nAD/DH 104/28 Engine Mounting Attachment Fittings - Inspection 12/71\n\nApplicability: All models.\n\n \n\nDocument: Hawker Siddeley TNS CT(104) No. 226. Compliance: Before 1 April 1972.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on engine mount inspections for one aircraft type. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Extremely short document — only 8 substantive lines","No defined terms section","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Single, unambiguous compliance requirement with fixed deadline","No conditional logic, exceptions, or nested provisions","Straightforward applicability ('All models')","References external technical document rather than embedding complex technical specifications"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft.\n\n**What it does:**\n- Requires owners and operators of **DH 104 (Dove) series aeroplanes** — a British twin-engine aircraft from the 1940s-60s — to inspect the **engine mounting attachment fittings** (the metal brackets and bolts that hold the engines to the wings).\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains a DH 104 Dove aircraft in Australia.\n\n**Why it matters:**\n- Engine mount failures are catastrophic — if the fittings crack or break, the engine could detach from the wing in flight. This directive was issued after Hawker Siddeley (the manufacturer) identified a potential safety issue.\n\n**Key details:**\n- **Compliance deadline:** Before 1 April 1972\n- **Technical reference:** Hawker Siddeley Service Bulletin TNS CT(104) No. 226\n- **Applies to:** All models of the DH 104 Dove\n\nThis is a historical directive from 1971, but if any Doves remain in Australian skies, the requirement still stands unless superseded by a later directive."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text presents a single, time-limited requirement that applies to all DH 104 models and references a specific technical note. The document does not indicate any amendment to, narrowing of, or expansion beyond that stated applicability and compliance deadline. There is no language in the supplied text that shows the scope was altered from an earlier or different intent."},"complexity_factors":["Short, single-issue directive limited to inspection of a specific component (engine mounting attachment fittings).","Applies uniformly to all models of a single aircraft series (\"Applicability: All models.\").","Fixed compliance deadline (\"Before 1 April 1972\") concentrates implementation timing.","Relies on an external technical document (Hawker Siddeley TNS CT(104) No. 226) for inspection procedure rather than containing procedural detail.","No multiple compliance options or conditional requirements set out in the text."],"plain_english_summary":"This airworthiness directive requires operators of all DH 104 (Dove) aeroplanes to inspect engine mounting attachment fittings per Hawker Siddeley TNS CT(104) No. 226, with inspections completed before 1 April 1972. It affects owners/operators and maintenance personnel, who bear inspection and repair costs; the Civil Aviation Safety Authority issued the mandatory requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-104-28-engine-mounting-attachment-fittings-inspection","history":"/api/acts/ad-dh-104-28-engine-mounting-attachment-fittings-inspection/history","analysis":"/api/acts/ad-dh-104-28-engine-mounting-attachment-fittings-inspection/analysis","conflicts":"/api/acts/ad-dh-104-28-engine-mounting-attachment-fittings-inspection/conflicts","importantCases":"/api/acts/ad-dh-104-28-engine-mounting-attachment-fittings-inspection/important-cases","documents":"/api/acts/ad-dh-104-28-engine-mounting-attachment-fittings-inspection/documents"}}