{"id":"F2006B08861","name":"AD/DH 104/17 Amdt 2 - Aileron Lever - 4WA315 - Inspection and Modification","slug":"ad-dh-104-17-amdt-2-aileron-lever-4wa315-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52060,"registerId":"commonwealth-F2006B08861-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH 104/17 Amdt 2 - Aileron Lever - 4WA315 - Inspection and Modification","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 104/17\n\nAmdt 2\n\n\nAileron Lever - 4WA315 - Inspection and Modification\n\n\n1/70\n\n \n\nApplicability: All models not incorporating Mod. 967. Document: Hawker Siddeley TNS CT(104) No. 151 Issue 4.\n\nCompliance: Inspect at intervals not exceeding 50 hours time in service until modified. Modify before 1 June 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\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 appears to be a discrete, targeted safety directive focused on a specific mechanical defect in a specific aircraft type. The amendment history (Amdt 2) suggests refinement of the original 1970 directive rather than scope creep. The document maintains its original narrow purpose: ensuring airworthiness of DH 104 Dove aileron levers."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 substantive requirements (inspect and modify)","Single defined term (Mod. 967 referenced but not defined in text)","No cross-references to other legislation","Simple conditional logic (applies to 'all models not incorporating Mod. 967')","Clear deadline (1 June 1970) and interval (50 hours)","Technical reference to manufacturer document (Hawker Siddeley TNS CT(104) No. 151 Issue 4) but no need to reproduce its content"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for **DH 104 Dove series aeroplanes** (a British twin-engine aircraft from the 1940s-60s).\n\n**What it requires:**\n- **Inspection**: Owners must check a specific part called the **aileron lever** (part number 4WA315) at least every 50 hours of flight time.\n- **Modification**: They must permanently modify this part before 1 June 1970.\n\n**Who it affects:**\n- All DH 104 Dove aircraft models that haven't already been fitted with **Modification 967** (a factory upgrade that fixes this problem).\n\n**Why it matters:**\n- This directive addresses a safety defect in the aileron control system. The ailerons are the hinged surfaces on the wings that make the aircraft roll left or right. A faulty lever could cause loss of control.\n- The \"Amdt 2\" means this is the second amendment to the original 1970 directive, suggesting the safety requirement has been updated over time.\n\n**Key point:** This is a **mandatory compliance** document — aircraft cannot legally fly without meeting these requirements."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"This instrument is labelled Amendment 2 to AD/DH 104/17, which indicates it modifies the earlier directive. The current text sets the applicability (excludes aircraft with Mod. 967), points to Hawker Siddeley TNS CT(104) No. 151 Issue 4 for technical instructions (Document), mandates inspections at intervals not exceeding 50 hours until the modification is done, and imposes a hard modification deadline of 1 June 1970 (Compliance). The amendment therefore changes or restates the directive’s operational scope and compliance timetable relative to the prior version; the present text itself defines the operative scope and obligations."},"complexity_factors":["Narrow technical scope: single part (aileron lever 4WA315) on a single aircraft family (DH 104) reduces breadth of issues.","Clear, simple compliance actions: repeating inspection interval (≤50 hours) and a one‑off modification with a fixed deadline.","Explicit applicability carve-out: aircraft incorporating Mod. 967 are excluded, which is a straightforward conditional rule.","Dependency on an external technical document (Hawker Siddeley TNS CT(104) No. 151 Issue 4) adds modest complexity for operators needing the manufacturer's instructions.","Fixed historical deadline (1 June 1970) suggests legacy status but requires operators to verify the record; potential administrative burden for historical compliance evidence.","No detailed procedural exceptions or discretion in the text increases procedural clarity but shifts any flexibility to the issuing authority or separate processes."],"plain_english_summary":"This AD requires operators of DH 104 (Dove) aeroplanes without Modification 967 to inspect a specific aileron lever part (4WA315) every ≤50 flight hours and to carry out the modification described in Hawker Siddeley TNS CT(104) No. 151 Issue 4 by 1 June 1970.  \n\nOperators (or their authorised maintenance organisations) must schedule and pay for the recurring inspections and the one‑time modification; aircraft already with Mod. 967 are exempt."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-104-17-amdt-2-aileron-lever-4wa315-inspection-and-modification","history":"/api/acts/ad-dh-104-17-amdt-2-aileron-lever-4wa315-inspection-and-modification/history","analysis":"/api/acts/ad-dh-104-17-amdt-2-aileron-lever-4wa315-inspection-and-modification/analysis","conflicts":"/api/acts/ad-dh-104-17-amdt-2-aileron-lever-4wa315-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-dh-104-17-amdt-2-aileron-lever-4wa315-inspection-and-modification/important-cases","documents":"/api/acts/ad-dh-104-17-amdt-2-aileron-lever-4wa315-inspection-and-modification/documents"}}