{"id":"F2006B06758","name":"AD/SA-TP/10 - Main Undercarriage Bracing Strut Shackles","slug":"ad-sa-tp-10-main-undercarriage-bracing-strut-shackles","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114588,"registerId":"commonwealth-F2006B06758-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SA-TP/10 - Main Undercarriage Bracing Strut Shackles","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)  British Aerospace (Scottish Aviation) Twin Pioneer Series Aeroplanes\n\n \n\nAD/SA-TP/10 Main Undercarriage Bracing Strut Shackles NK\n\nApplicability: All models.\n\n \n\nDocument: Scottish Aviation Mod. No. C598. Compliance: Before 1200 hours component time in service.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, original Airworthiness Directive with a narrow, specific safety purpose. It has not expanded beyond its original intent of addressing a known defect in Twin Pioneer undercarriage shackles. The scope remains tightly constrained to the specific aircraft type and component identified."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 1 defined term implicitly referenced ('time in service')","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998 citation","Single, unambiguous compliance requirement (implement Mod C598 before 1,200 hours)","No conditional logic, exceptions, or alternative compliance methods stated","Narrow, specific applicability (single aircraft type, all models)","Minimal procedural detail—refers to external technical document (Scottish Aviation Mod. No. C598) for actual implementation steps"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) issued by Australia's Civil Aviation Safety Authority (CASA). It applies to all models of the **British Aerospace (Scottish Aviation) Twin Pioneer** aircraft—a twin-engine, high-wing transport plane originally built in Scotland.\n\n**What it does:**\nThe directive mandates a specific safety modification to the **main undercarriage bracing strut shackles**—the metal fittings that connect the landing gear support struts to the aircraft structure. These shackles are critical for maintaining the structural integrity of the landing gear during takeoff, landing, and ground operations.\n\n**Who must comply:**\n- Owners and operators of all Twin Pioneer series aircraft\n- Maintenance organisations servicing these aircraft\n\n**What must be done:**\nOperators must implement **Scottish Aviation Modification No. C598** before the affected components accumulate **1,200 hours of time in service** (roughly the total operating hours on that specific part).\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. They typically issue when an unsafe condition has been identified in an aircraft type. Non-compliance means the aircraft cannot legally fly in Australian airspace. This particular AD addresses potential failure of undercarriage components that could lead to landing gear collapse—a serious safety risk."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The provided text sets a single, targeted requirement: perform the action in Scottish Aviation Mod. No. C598 on Twin Pioneer main undercarriage bracing strut shackles before they reach 1,200 hours component time. The directive itself does not indicate any change to that scope or any expansion/reduction compared with a prior statement; it applies to all models and prescribes the compliance deadline and technical reference."},"complexity_factors":["Narrow, single action requirement (one referenced modification) reduces procedural complexity.","Clear numeric deadline (1,200 hours component time in service) simplifies compliance tracking.","Applicability stated as 'All models' increases the population of affected aircraft but does not add technical variety in this text.","Dependence on an external technical document (Scottish Aviation Mod. No. C598) requires consulting another source for implementation detail.","No alternative compliance paths, exemptions, or procedural detail provided in the text, so administrative complexity centers on obtaining and following the referenced mod."],"plain_english_summary":"Operators of British Aerospace (Scottish Aviation) Twin Pioneer aeroplanes must carry out the modification or action specified in Scottish Aviation Mod. No. C598 on the main undercarriage bracing strut shackle before any affected shackle reaches 1,200 hours component time in service.\n\nThis mandatory work, funded and scheduled by the aircraft owner/operator, requires tracking component hours and consulting Mod. No. C598 for the technical details."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sa-tp-10-main-undercarriage-bracing-strut-shackles","history":"/api/acts/ad-sa-tp-10-main-undercarriage-bracing-strut-shackles/history","analysis":"/api/acts/ad-sa-tp-10-main-undercarriage-bracing-strut-shackles/analysis","conflicts":"/api/acts/ad-sa-tp-10-main-undercarriage-bracing-strut-shackles/conflicts","importantCases":"/api/acts/ad-sa-tp-10-main-undercarriage-bracing-strut-shackles/important-cases","documents":"/api/acts/ad-sa-tp-10-main-undercarriage-bracing-strut-shackles/documents"}}