{"id":"F2006B08928","name":"AD/DH114/18 Amdt 1 - Wing Spar - Inspection","slug":"ad-dh114-18-amdt-1-wing-spar-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52499,"registerId":"commonwealth-F2006B08928-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/18 Amdt 1 - Wing Spar - 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/DH114/18\n\nAmdt 1\n\n\nWing Spar - Inspection NK\n\n \n\nApplicability: All models up to S/No. 14094, and S/No. 14098, not incorporating Mod. 843. Document:               Hawker Siddeley TNS Heron (114) No. W6, Issue 3.\n\nCompliance: As detailed in requirement document with effect from 30 May 1975.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This entry is presented as an amendment (Amdt 1) to AD/DH114/18. As amended, the directive specifies the affected serial-number ranges and excludes aircraft with Mod. 843, and it requires compliance with the external requirement document (Hawker Siddeley TNS Heron (114) No. W6, Issue 3) with effect from 30 May 1975. The amendment therefore alters the operative directive by clarifying applicability and by tying mandatory inspections to the referenced technical document (see: \"Amdt 1\", \"Applicability\", \"Document\", and \"Compliance\")."},"complexity_factors":["Short directive text that delegates procedural detail to an external technical document (Hawker Siddeley TNS Heron (114) No. W6, Issue 3), requiring cross-reference to understand full requirements.","Applicability defined by specific serial-number ranges and by exclusion (not incorporating Mod. 843), so determining applicability requires checking aircraft records.","Effective date provided but no inspection intervals, tolerances, or corrective-action steps in the AD text itself.","Legal authority and enforcement mechanism are clear (Civil Aviation Safety Authority), but operational discretion is located in the referenced document and in regulator enforcement.","Historic effective date (30 May 1975) may require checking legacy records and modification status for compliance verification."],"plain_english_summary":"What this instrument does mechanically\n\n- This is an amendment (Amdt 1) to an airworthiness directive that requires inspections of the wing spar on Hawker Siddeley DH114 (Heron) series aeroplanes. The directive applies to specified serial-number ranges and to aircraft that have not had a particular modification fitted. (See: \"AD/DH114/18 Amdt 1\", \"Wing Spar - Inspection\", and \"Applicability: All models up to S/No. 14094, and S/No. 14098, not incorporating Mod. 843.\")\n\n- The inspections and any related work must be carried out in accordance with the requirement document named: Hawker Siddeley TNS Heron (114) No. W6, Issue 3. The directive establishes the compliance regime and an effective date for that regime: \"As detailed in requirement document with effect from 30 May 1975.\" (See: \"Document: Hawker Siddeley TNS Heron (114) No. W6, Issue 3.\" and \"Compliance: ... with effect from 30 May 1975.\")\n\nWho decides and who is affected\n\n- The Civil Aviation Safety Authority issues and enforces this airworthiness directive under the Civil Aviation Regulations. (See header: \"Civil Aviation Regulations 1998, PART 39 ... CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES.\")\n\n- The directive targets the operators and owners of DH114 (Heron) aircraft with the serial numbers listed and that do not incorporate Mod. 843. Those operators/owners are the parties obliged to ensure inspections are performed in accordance with the referenced requirement document. (See: \"Applicability\" and \"Compliance.\")\n\nWhy it matters (stated purpose and practical testing of that purpose)\n\n- The directive is titled \"Wing Spar - Inspection\" and therefore its stated operational purpose is to require inspection of a primary structural component. The legal instrument achieves that by mandating inspections per a specified manufacturer/technical document and by fixing an effective date for compliance. (See: title and \"Compliance\".)\n\n- Testing that purpose against practical trade-offs and implementation mechanics: the instrument creates a clear compliance obligation but the specific inspection steps, intervals and corrective actions are not detailed in the text of the directive itself; instead they are contained in the referenced requirement document (Hawker Siddeley TNS Heron (114) No. W6, Issue 3). That makes the obligation dependent on an external technical document rather than on procedural detail in the AD text. (See: \"Document: ... No. W6, Issue 3.\" and \"Compliance: As detailed in requirement document.\")\n\nWho pays, what incentives change, and immediate burdens\n\n- The direct financial and operational burden of complying (scheduling inspections, taking aircraft out of service, paying for inspections and any necessary repairs) falls on the aircraft owners/operators required to comply. (Implied by \"Applicability\" and \"Compliance.\" )\n\n- The directive narrows the affected population by serial number and by exclusion of aircraft that have Mod. 843 fitted; that creates a discrete rule for who must comply and who does not. (See: \"Applicability: ... not incorporating Mod. 843.\")\n\nImplementation risk, discretion and information dependencies\n\n- The AD delegates procedural detail to the referenced manufacturer/technical document. That concentrates implementation discretion in the content and clarity of that external document: if the requirement document is incomplete or ambiguous, operators must interpret it or seek regulator guidance. (See: \"Document: ... No. W6, Issue 3.\" and \"Compliance: As detailed in requirement document.\")\n\n- The AD as published is brief and does not set out tolerances, timelines (other than the effective date), or remediation measures in its text. Those practical elements are therefore dependent on the requirement document and on the regulator/operator interaction when the requirement is enforced. (See: \"Compliance: ... with effect from 30 May 1975.\")\n\nMarket and private-enterprise effects to note\n\n- The directive imposes a regulatory compliance cost on private owners/operators of the listed aircraft types and serial numbers. It does not, in the text provided, create subsidies, exemptions (other than the Mod. 843 exclusion), or payment responsibilities for any other party. (See: \"Applicability\" and \"Compliance.\")\n\n- The directive could reduce available flying hours for affected aircraft while inspections are performed and could create secondary costs if inspections reveal defects that require repair or grounding. The AD text itself does not quantify those effects; it confines the operational requirement to inspections as specified in the referenced technical document. (See: \"Compliance\" and \"Document.\")"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive for a specific aircraft type. It has not expanded beyond its original purpose of ensuring wing spar integrity in the specified Heron aircraft fleet."},"complexity_factors":["Extremely short document (approximately 150 words of substantive content)","Only one defined applicability criterion (serial number range plus modification status)","Single cross-reference to external technical document (Hawker Siddeley TNS W6)","No conditional logic, exceptions, or nested provisions","Straightforward compliance date with no alternative methods or phased implementation","Minimal regulatory machinery — essentially a notice format referring to technical standards elsewhere"],"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 **De Havilland DH114 Heron series aeroplanes** to inspect the **wing spar** (the main structural beam that runs through the wing and carries most of the flight loads).\n\n**Who it affects:**\n- All DH114 Heron aircraft with **serial numbers up to 14094, plus serial number 14098**, **unless** they have been modified with \"Mod. 843\" (a specific factory modification that apparently addresses this issue).\n\n**What must be done:**\n- Operators must follow the inspection procedures detailed in **Hawker Siddeley Technical Note W6, Issue 3**.\n- Compliance was required **from 30 May 1975** onwards.\n\n**Why it matters:**\n- Wing spar failures can be catastrophic. This AD ensures older Heron aircraft are checked for structural integrity, preventing potential in-flight breakups. It's a **safety-critical maintenance requirement** — flying without compliance would breach civil aviation regulations.\n\n**Note:** This is \"Amendment 1\" (Amdt 1), meaning the original directive was updated, though the text provided doesn't specify what changed from the original."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-18-amdt-1-wing-spar-inspection","history":"/api/acts/ad-dh114-18-amdt-1-wing-spar-inspection/history","analysis":"/api/acts/ad-dh114-18-amdt-1-wing-spar-inspection/analysis","conflicts":"/api/acts/ad-dh114-18-amdt-1-wing-spar-inspection/conflicts","importantCases":"/api/acts/ad-dh114-18-amdt-1-wing-spar-inspection/important-cases","documents":"/api/acts/ad-dh114-18-amdt-1-wing-spar-inspection/documents"}}