{"id":"F2006B06766","name":"AD/SA-TP/18 Amdt 2 - Bolts in Main Undercarriage, Wing Lift Struts and Tailplane Attachments","slug":"ad-sa-tp-18-amdt-2-bolts-in-main-undercarriage-wing-lift-struts-and-tailplane-attachments","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114599,"registerId":"commonwealth-F2006B06766-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SA-TP/18 Amdt 2 - Bolts in Main Undercarriage, Wing Lift Struts and Tailplane Attachments","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\n# AD/SA-TP/18\n\nAmdt 2\n\nApplicability: All models.\n\n\n# Bolts in Main Undercarriage, Wing Lift NK Struts and Tailplane Attachments\n\n \n\nDocument: Scottish Aviation TNS No. 22, Issue 5. Compliance:  As detailed in the requirement document.\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":false,"description":"The supplied text does not indicate any change in scope from prior versions. The AD as provided applies to all Twin Pioneer models and requires compliance with Scottish Aviation TNS No. 22, Issue 5; no expansion or narrowing of applicability is stated in the supplied document."},"complexity_factors":["Reference to an external technical document (Scottish Aviation TNS No. 22, Issue 5) rather than inclusion of technical details in the AD itself","AD text provides minimal operational detail (\"Compliance: As detailed in the requirement document\"), requiring operators to consult the TNS for specifics","Applicability to all models increases the population of affected aircraft and the need for widespread compliance tracking (\"Applicability: All models\")","Regulatory enforcement and effect flow from CASA-issued AD under Part 39, creating a legal obligation but leaving substantive technical content to the referenced TNS","Potential for variation across operators only to the extent the TNS allows alternative methods or interpretations (not specified in the AD text)"],"plain_english_summary":"This airworthiness directive (AD) instructs owners and operators of British Aerospace (Scottish Aviation) Twin Pioneer series aeroplanes that they must follow the technical requirements set out in Scottish Aviation TNS No. 22, Issue 5 for bolts located in the main undercarriage, wing lift struts and tailplane attachments. (See: AD/SA-TP/18 Amdt 2; \"Applicability: All models\"; \"Document: Scottish Aviation TNS No. 22, Issue 5\".)\n\nMechanically, the AD requires operators to obtain and comply with the procedures, inspection criteria, and any remedial actions specified in the referenced technical note. The AD makes compliance with that specified technical note mandatory for the identified bolt locations. (See: \"Compliance: As detailed in the requirement document\" and \"Document: Scottish Aviation TNS No. 22, Issue 5\".)\n\nWho decides and who acts:\n- The Civil Aviation Safety Authority (CASA) issues this AD under the SCHEDULE OF AIRWORTHINESS DIRECTIVES. (See header: \"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - CIVIL AVIATION SAFETY AUTHORITY\".)\n- Aircraft owners and operators of all Twin Pioneer models must obtain and follow the referenced TNS to determine the required inspections, repairs, replacements, intervals and acceptability criteria. (See: \"Applicability: All models\"; \"Compliance: As detailed in the requirement document\".)\n\nWhere the detail lives:\n- The specific inspections, repairs, replacement parts (if any), service intervals and acceptability criteria are set out in Scottish Aviation TNS No. 22, Issue 5. The AD itself does not reproduce those technical details; it requires adherence to them. (See: \"Document: Scottish Aviation TNS No. 22, Issue 5\" and \"Compliance: As detailed in the requirement document\".)\n\nPractical implications (mechanical and administrative):\n- Operators must obtain the referenced TNS and follow it for the identified bolt locations.\n- Compliance is required for all Twin Pioneer models covered by this AD.\n\nThis summary describes what the AD requires, who must act, and where to find the concrete technical steps. It does not restate or evaluate any broader policy rationale that may be claimed elsewhere."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 2 to an existing Airworthiness Directive. The scope remains precisely targeted at bolt integrity in specific structural locations on the Twin Pioneer aircraft. There is no evidence of scope creep; the amendment likely updates the reference document version (Issue 5 of TNS No. 22) or makes minor administrative corrections without expanding the directive's coverage."},"complexity_factors":["Extremely short document — only 2 substantive paragraphs","No defined terms section; all language is plain technical aviation terminology","Single cross-reference to external document (Scottish Aviation TNS No. 22, Issue 5) — compliance delegated entirely to that manual","No conditional logic, exceptions, or nested provisions","Simple structure: identifier → applicability → subject matter → reference document → compliance method"],"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). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of **British Aerospace (Scottish Aviation) Twin Pioneer aircraft** to inspect or replace specific bolts in three critical areas:\n- The **main undercarriage** (landing gear)\n- The **wing lift struts** (structural supports that hold the wings up)\n- The **tailplane attachments** (the part that connects the tail to the fuselage)\n\n**Who it affects:** Anyone who owns, operates, or maintains a Twin Pioneer aeroplane — all models are covered.\n\n**How to comply:** Operators must follow the instructions in **Scottish Aviation Technical Note Service (TNS) No. 22, Issue 5**. This document tells mechanics exactly what to check, replace, or modify.\n\n**Why it matters:** Bolts in these locations hold the plane together. If they fail, the wing could detach, the landing gear could collapse, or the tail could separate — any of which would likely be catastrophic. This AD ensures these critical fasteners are properly maintained before they cause an accident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sa-tp-18-amdt-2-bolts-in-main-undercarriage-wing-lift-struts-and-tailplane-attachments","history":"/api/acts/ad-sa-tp-18-amdt-2-bolts-in-main-undercarriage-wing-lift-struts-and-tailplane-attachments/history","analysis":"/api/acts/ad-sa-tp-18-amdt-2-bolts-in-main-undercarriage-wing-lift-struts-and-tailplane-attachments/analysis","conflicts":"/api/acts/ad-sa-tp-18-amdt-2-bolts-in-main-undercarriage-wing-lift-struts-and-tailplane-attachments/conflicts","importantCases":"/api/acts/ad-sa-tp-18-amdt-2-bolts-in-main-undercarriage-wing-lift-struts-and-tailplane-attachments/important-cases","documents":"/api/acts/ad-sa-tp-18-amdt-2-bolts-in-main-undercarriage-wing-lift-struts-and-tailplane-attachments/documents"}}