{"id":"F2006B08926","name":"AD/DH114/16 Amdt 1 - Engine Mounting Frames - Inspection","slug":"ad-dh114-16-amdt-1-engine-mounting-frames-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52492,"registerId":"commonwealth-F2006B08926-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/16 Amdt 1 - Engine Mounting Frames - 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/DH114/16\n\nAmdt 1\n\n\nEngine Mounting Frames - Inspection NK\n\n \n\nApplicability: All models fitted with engine mount frames P/N 14EM-11A and 14EM-12A.\n\n \n\nRequirement: 1. Inspect the engine mounting frames for evidence of internal corrosion by visual and radiographic means.\n\n \n\n2. The inspection shall be carried out in accordance with Hawker Siddeley TNS Heron (114) No. E3 Issue 2. Radiographs and any associated reports shall be submitted to the Secretary for examination.\n\n \n\nCompliance: At intervals not exceeding 4 years after 31 August 1970.\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 narrow, targeted safety directive focused specifically on corrosion inspection of engine mounting frames in a particular vintage aircraft type. It has not expanded beyond its original purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 substantive requirements","Single applicability criterion (specific part numbers)","No defined terms section","No cross-references to other legislation","Simple compliance timeline (fixed 4-year interval)","Single technical reference to external standard (Hawker Siddeley document)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nIt requires owners and operators of specific de Havilland DH114 Heron aircraft to inspect the **engine mounting frames** (the structures that hold the engines to the wings) for hidden **internal corrosion**.\n\n**Who it affects:**\nAll DH114 Heron aircraft fitted with specific engine mount part numbers: **14EM-11A and 14EM-12A**.\n\n**What must be done:**\n- **Visual and X-ray (radiographic) inspections** of the engine mounting frames\n- Follow the specific technical procedure: **Hawker Siddeley TNS Heron (114) No. E3 Issue 2**\n- Submit the X-ray images and reports to the **Secretary** (a CASA official) for review\n\n**When:**\nEvery **4 years**, starting from **31 August 1970**.\n\n**Why it matters:**\nInternal corrosion in engine mounts can weaken the structure without visible warning, potentially leading to **engine separation in flight**. This directive prevents catastrophic failures by catching hidden damage before it becomes dangerous."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"This instrument is labelled as Amendment 1 and, in its text, prescribes inspections for engine mounting frames P/N 14EM-11A and 14EM-12A, requires visual and radiographic inspection in accordance with Hawker Siddeley TNS Heron (114) No. E3 Issue 2, mandates submission of radiographs and any reports to the Secretary for examination, and sets a recurring compliance interval not exceeding 4 years after 31 August 1970. The amendment therefore establishes these specific procedural, reporting and scheduling requirements as the operative scope of the directive."},"complexity_factors":["Narrow and specific applicability limited to two part numbers (P/N 14EM-11A and 14EM-12A). (Applicability)","Single technical requirement: visual plus radiographic inspection for internal corrosion. (Requirement 1)","Reference to an external manufacturer document (Hawker Siddeley TNS Heron (114) No. E3 Issue 2) that sets the detailed inspection method and acceptance criteria. (Requirement 2)","Obligation to submit radiographs and associated reports to the Secretary for examination (administrative step). (Requirement 2)","Fixed, simple compliance interval (every up to 4 years after 31 August 1970) rather than complex staged or conditional timing. (Compliance)"],"plain_english_summary":"Owners/operators of DH114 (Heron) aeroplanes with engine mount frames P/N 14EM-11A or 14EM-12A must perform visual and radiographic inspections for internal corrosion (per Hawker Siddeley TNS Heron No. E3 Issue 2), at intervals not exceeding four years after 31 August 1970. Operators fund and arrange inspections, submit radiographs and reports to the Secretary for examination—imposing recurring technical, administrative and procurement costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-16-amdt-1-engine-mounting-frames-inspection","history":"/api/acts/ad-dh114-16-amdt-1-engine-mounting-frames-inspection/history","analysis":"/api/acts/ad-dh114-16-amdt-1-engine-mounting-frames-inspection/analysis","conflicts":"/api/acts/ad-dh114-16-amdt-1-engine-mounting-frames-inspection/conflicts","importantCases":"/api/acts/ad-dh114-16-amdt-1-engine-mounting-frames-inspection/important-cases","documents":"/api/acts/ad-dh114-16-amdt-1-engine-mounting-frames-inspection/documents"}}