{"id":"F2006B08955","name":"AD/DH114/43 Amdt 2 - Centre Section Main Spar Top and Bottom Boom Joint - Inspection","slug":"ad-dh114-43-amdt-2-centre-section-main-spar-top-and-bottom-boom-joint-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52519,"registerId":"commonwealth-F2006B08955-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/43 Amdt 2 - Centre Section Main Spar Top and Bottom Boom Joint - 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\n# AD/DH114/43\n\nAmdt 2\n\nApplicability: All models.\n\n\n# Centre Section Main Spar Top and NK Bottom Boom Joint - Inspection\n\n \n\nRequirement: 1 Inspect the Centre Section Main Spar Top Boom in accordance with Hawker Siddeley TNS Heron (114) No. F.19 Appendix 1, or in accordance with a technique approved by the Secretary. Technique ATG/NDI/US/1 constitutes such an approved technique.\n\n \n\n2. Inspect the Centre Section Main Spar Bottom Boom of those aircraft without Mod. 492 embodied, in accordance with Hawker Siddeley TNS Heron (114) No. F.20, Appendix 1, or in accordance with a technique approved by the Secretary. Technique ATG/NDI/US/1 constitutes such an approved technique.\n\n \n\nNote: Where crack indications are found the Airworthiness Branch, Central Office, is to be notified before further flight.\n\n \n\nCompliance: Inspect at intervals in accordance with Hawker Siddeley TNS Heron (114) No. F.19 and F.20 as applicable.\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":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope: mandating specific structural inspections for the DH114 Heron aircraft type. As Amendment 2, it has been revised to update inspection requirements or methods, but has not expanded beyond its original purpose of ensuring main spar structural integrity."},"complexity_factors":["Short, single-purpose directive (approximately 200 words)","Only 2 defined technical references (Hawker Siddeley TNS Heron No. F.19 and F.20)","Simple conditional logic: bottom boom inspection only applies to aircraft 'without Mod. 492 embodied'","No nested exceptions or complex cross-referencing to other legislation","Straightforward compliance requirement: inspect at intervals per the referenced technical documents","Single note regarding crack reporting procedure"],"plain_english_summary":"Owners, operators and maintenance organisations of de Havilland DH114 Heron aircraft must carry out regular non‑destructive inspections of the centre‑section main spar top and (if not modified by Mod. 492) bottom boom joints to detect fatigue cracks that could lead to wing separation. Cracks must be reported to CASA’s Airworthiness Branch before the aeroplane flies again.\n\nThis is Amendment 2 of the directive, updating required inspection methods and approvals to address ageing‑aircraft safety risks."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument is labelled 'Amdt 2' but the supplied text does not show the prior version or explicit additions/removals. On its face it prescribes inspection requirements and references techniques/manuals; whether that represents a change in scope from the original instrument cannot be determined from the text provided."},"complexity_factors":["References external technical manuals (Hawker Siddeley TNS Heron (114) No. F.19 and F.20) rather than prescribing procedures directly (Requirement 1–2; Compliance).","Allows alternative techniques only if approved by the Secretary; one approved technique is named (Technique ATG/NDI/US/1) (Requirement 1–2).","Applies conditionally to aircraft without Mod. 492 for bottom boom inspection, creating a divergent requirement set (Requirement 2).","Mandatory reporting requirement if cracks are found, with a restriction on further flight until notified (Note).","Inspection intervals are delegated to the referenced manuals rather than fixed in the instrument, requiring operators to consult external documents (Compliance).","Broad applicability ('All models') but limited substantive scope (specific joint inspections), reducing operational complexity but requiring technical capability to perform non‑destructive inspections."],"plain_english_summary":"Requires operators of all DH114 (Heron) aircraft to inspect the centre‑section main spar top boom and, for aircraft without Mod. 492, the bottom boom using Hawker Siddeley TNS Heron No. F.19/F.20 or a Secretary‑approved technique (Technique ATG/NDI/US/1). (Requirement 1–2; Compliance.)\n\nIf crack indications are found, operators must notify the Airworthiness Branch before further flight. The Secretary decides on approved alternative techniques; operators pay inspection costs and must follow the manuals' intervals. (Note.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-43-amdt-2-centre-section-main-spar-top-and-bottom-boom-joint-inspection","history":"/api/acts/ad-dh114-43-amdt-2-centre-section-main-spar-top-and-bottom-boom-joint-inspection/history","analysis":"/api/acts/ad-dh114-43-amdt-2-centre-section-main-spar-top-and-bottom-boom-joint-inspection/analysis","conflicts":"/api/acts/ad-dh114-43-amdt-2-centre-section-main-spar-top-and-bottom-boom-joint-inspection/conflicts","importantCases":"/api/acts/ad-dh114-43-amdt-2-centre-section-main-spar-top-and-bottom-boom-joint-inspection/important-cases","documents":"/api/acts/ad-dh114-43-amdt-2-centre-section-main-spar-top-and-bottom-boom-joint-inspection/documents"}}