{"id":"F2006B08858","name":"AD/DH 104/14 Amdt 3 - Wing/Fuselage Lower Main Root Joint - Inspection","slug":"ad-dh-104-14-amdt-3-wing-fuselage-lower-main-root-joint-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52057,"registerId":"commonwealth-F2006B08858-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH 104/14 Amdt 3 - Wing/Fuselage Lower Main Root 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)  DH 104 (Dove) Series Aeroplanes\n\n \n\nAD/DH 104/14\n\nAmdt 3\n\nApplicability: All models.\n\n\nWing/Fuselage Lower Main Root Joint - Inspection\n\n\n9/71\n\n \n\nRequirement: Inspect the wing to fuselage lower main root joint for corrosion, fretting and cracking in accordance with Hawker Siddeley Technical News Sheet CT(104) No. 168 Issue 4.\n\n \n\nNote: Magnetic particle inspection to para. 1.2 of the previous issue of this Directive, or fluorescent magnetic particle inspection in accordance with ANO 108.8 are acceptable alternatives to the eddy current technique specified in Hawker Siddeley TNS CT (104) No. 217 and Appendix 2 of TNS CT(104) No. 168 Issue 4.\n\n \n\nCompliance: As detailed in TNS CT(104) No. 168 Issue 4.\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 Amendment 3 to an existing Airworthiness Directive. The scope remains tightly focused on the original safety concern: inspecting the wing/fuselage lower main root joint on DH 104 Dove aircraft. The amendment appears to update the technical reference document (to Issue 4 of the Technical News Sheet) and clarify acceptable alternative inspection methods, without expanding the scope to other aircraft types or structural components."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly referenced (the aircraft model series)","No nested conditional logic or exceptions to exceptions","Single compliance pathway with one explicit alternative method permitted","Relies entirely on external technical documents for detailed procedures (incorporation by reference)","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for a specific aircraft type.\n\n**Which aircraft:** All models of the DH 104 \"Dove\" series aeroplanes (a British twin-engine aircraft from the 1940s-60s, also known as the de Havilland Dove).\n\n**What it requires:** Aircraft owners/operators must inspect a critical structural joint where the wing meets the fuselage at the lower main root. Specifically, they must check for:\n- **Corrosion** (rust or deterioration of metal)\n- **Fretting** (wear damage from repeated rubbing/vibration)\n- **Cracking** (fractures in the metal)\n\n**How to do it:** Follow the inspection procedures in Hawker Siddeley Technical News Sheet CT(104) No. 168 Issue 4.\n\n**Flexibility allowed:** You can use alternative inspection methods — specifically magnetic particle inspection (a technique using magnetic fields and iron particles to find surface cracks) or fluorescent magnetic particle inspection — instead of the eddy current method (which uses electromagnetic induction) specified in some versions of the technical documents.\n\n**When to comply:** Follow the timing and intervals specified in the same technical document (TNS CT(104) No. 168 Issue 4).\n\n**Why it matters:** This joint carries massive structural loads. If it fails due to corrosion or cracking, the wing could separate from the fuselage in flight. This AD ensures aging aircraft are checked before catastrophic failure occurs."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This Amendment (Amdt 3) clarifies the inspection requirement for the wing/fuselage lower main root joint and expressly permits magnetic particle and fluorescent magnetic particle inspection as alternatives to the eddy‑current technique referenced in earlier material. Compliance and procedural specifics are delegated to Hawker Siddeley TNS CT(104) No.168 Issue 4."},"complexity_factors":["Relies on external technical documents (Hawker Siddeley TNS CT(104) No.168 Issue 4 and CT(104) No.217) for procedural and compliance detail, requiring operators to obtain and follow those papers.","Accepts multiple non‑destructive inspection (NDT) methods (eddy current, magnetic particle, fluorescent magnetic particle), which requires operators to choose appropriate certified techniques and personnel.","Applicability covers all models of DH 104 series without specifying inspection intervals or remediation actions in the Directive text itself; those details are delegated to the referenced TNS.","Amendment form (Amdt 3) and cross‑references to prior paragraph numbering introduce small interpretive friction for operators reconciling current and previous issues."],"plain_english_summary":"This Airworthiness Directive requires operators of all DH 104 (Dove) series aeroplanes to inspect the wing-to-fuselage lower main root joint for corrosion, fretting and cracking, using the procedures in Hawker Siddeley Technical News Sheet CT(104) No.168 Issue 4. The Directive also accepts specified alternative non‑destructive inspection techniques (magnetic particle or fluorescent magnetic particle) in place of the eddy‑current method; compliance is as detailed in the cited technical sheet."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-104-14-amdt-3-wing-fuselage-lower-main-root-joint-inspection","history":"/api/acts/ad-dh-104-14-amdt-3-wing-fuselage-lower-main-root-joint-inspection/history","analysis":"/api/acts/ad-dh-104-14-amdt-3-wing-fuselage-lower-main-root-joint-inspection/analysis","conflicts":"/api/acts/ad-dh-104-14-amdt-3-wing-fuselage-lower-main-root-joint-inspection/conflicts","importantCases":"/api/acts/ad-dh-104-14-amdt-3-wing-fuselage-lower-main-root-joint-inspection/important-cases","documents":"/api/acts/ad-dh-104-14-amdt-3-wing-fuselage-lower-main-root-joint-inspection/documents"}}