{"id":"F2006B08952","name":"AD/DH114/40 - Engine Mounting Stay Struts - Inspection","slug":"ad-dh114-40-engine-mounting-stay-struts-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52511,"registerId":"commonwealth-F2006B08952-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/40 - Engine Mounting Stay Struts - 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)  DH114 (Heron) Series Aeroplanes\n\n \n\nAD/DH114/40 Engine Mounting Stay Struts - Inspection NK\n\nApplicability: All models incorporating modification 1125. Document: Hawker Siddeley TNS Heron (114) No. E.8. Compliance:  Before 1 April 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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a historical Airworthiness Directive from 1974 (or earlier, with a 1974 compliance deadline). As a discrete safety directive, it has not evolved beyond its original narrow purpose: mandating a specific inspection on a specific aircraft type. The scope remains precisely limited to DH114 Heron aircraft with modification 1125."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section — all terms are either common aviation parlance or explicitly referenced to external manufacturer documentation","No conditional logic or nested exceptions — simple binary applicability (modification 1125 present or not)","Single compliance requirement with absolute deadline (no phased compliance, no flight hours/landing cycles)","No cross-references to other legislation beyond the enabling regulation (Civil Aviation Regulations 1998, Part 39)","No penalty provisions, review mechanisms, or administrative procedures included in the text"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\n- Requires owners and operators of **DH114 (Heron) series aeroplanes** to inspect the **engine mounting stay struts** (structural supports that hold the engine in place)\n- The inspection must be completed **before 1 April 1974**\n- It applies to all models of this aircraft that have **modification 1125** installed\n\n**Who it affects:**\n- Owners, operators, and maintenance organisations responsible for DH114 Heron aircraft with the specified modification\n\n**Why it matters:**\n- Engine mounting struts are critical safety components. If they fail, the engine could detach from the wing during flight — a catastrophic failure\n- This directive ensures a specific structural weakness (addressed by modification 1125) is inspected before a hard deadline\n\n**Key document reference:** Hawker Siddeley Technical Note Service (TNS) Heron (114) No. E.8 — this is the manufacturer's technical instruction detailing how to perform the inspection"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive’s scope is narrowly defined in the text: it applies only to DH114 (Heron) aircraft that incorporate modification 1125 and requires an inspection per the referenced Hawker Siddeley document to be completed before 1 April 1974 (see \"Applicability\", \"Document\", \"Compliance\"). The published text does not indicate any expansion or contraction of those limits compared with what the directive itself states, so there is no internal evidence of a change in scope."},"complexity_factors":["Narrow, specific applicability (only models with modification 1125) reduces breadth of affected parties (see \"Applicability\").","Single, time‑limited compliance action (inspection before a fixed date) simplifies obligations (see \"Compliance\").","Directive refers to an external technical document for procedural detail rather than reproducing steps, creating a reliance on that document for implementation (see \"Document\").","No procedural detail in the AD about acceptable findings, required corrective actions, or administrative relief, which creates practical ambiguity for follow‑up steps.","Authority and scope are clear from the header, reducing legal uncertainty about who issued the requirement."],"plain_english_summary":"This AD requires owners/operators of DH114 (Heron) aircraft incorporating modification 1125 to have the engine mounting stay struts inspected per the Hawker Siddeley TNS Heron (114) No. E.8 procedure, with compliance required before 1 April 1974. Issued under the Civil Aviation Safety Authority, the cost and arrangement of the inspection fall to the aircraft owner/operator."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-40-engine-mounting-stay-struts-inspection","history":"/api/acts/ad-dh114-40-engine-mounting-stay-struts-inspection/history","analysis":"/api/acts/ad-dh114-40-engine-mounting-stay-struts-inspection/analysis","conflicts":"/api/acts/ad-dh114-40-engine-mounting-stay-struts-inspection/conflicts","importantCases":"/api/acts/ad-dh114-40-engine-mounting-stay-struts-inspection/important-cases","documents":"/api/acts/ad-dh114-40-engine-mounting-stay-struts-inspection/documents"}}