{"id":"F2006B06783","name":"AD/SA-TP/8 - Bolts on Undercarriage V Brace and Trunnion at Top of Oleo Leg","slug":"ad-sa-tp-8-bolts-on-undercarriage-v-brace-and-trunnion-at-top-of-oleo-leg","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114629,"registerId":"commonwealth-F2006B06783-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SA-TP/8 - Bolts on Undercarriage V Brace and Trunnion at Top of Oleo Leg","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/8 Bolts on Undercarriage “V” Brace and NK\n\nTrunnion at Top of Oleo Leg\n\n \n\nApplicability: All models.\n\n \n\nDocument: Scottish Aviation Mod. No. C347. Compliance: Forthwith.\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 text supplied contains only the current directive and does not include an earlier version or an explicit statement that the scope has been altered. Based on the instrument alone, it names the required modification (Scottish Aviation Mod. No. C347), applies to all models, and requires immediate compliance; there is no information in this document indicating a change from any prior scope or intent."},"complexity_factors":["Very short directive with a single clear mandatory action (low inherent legal complexity).","Requires embodiment of an external technical document (Scottish Aviation Mod. No. C347), so technical detail and execution depend on that separate source.","Immediate compliance timing (\"forthwith\") increases operational complexity for scheduling and resource availability.","Applicability to all models concentrates the field of affected operators but does not distinguish between variants, which may require interpretation in specific maintenance contexts.","No alternatives, grandfathering, or compliance procedures are stated in the text, increasing reliance on maintenance organisations' interpretation of the external modification."],"plain_english_summary":"This airworthiness directive requires owners/operators of the affected aeroplane series to embody Scottish Aviation Modification No. C347—addressing bolts on the undercarriage “V” brace and the trunnion at the oleo top—forthwith. It imposes mandatory immediate modification, with compliance costs, downtime and scheduling borne by operators, and no alternative means or timing flexibility provided in the directive itself."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a particular aircraft type. It has not expanded beyond its original purpose of mandating a specific modification to prevent landing gear failure."},"complexity_factors":["Extremely short document — approximately 150 words total","No defined terms section — all terminology is industry-standard aviation nomenclature","No conditional logic or nested exceptions — single straightforward applicability ('All models')","Single compliance requirement with no alternatives or phased implementation","No cross-references to other legislation beyond the enabling regulation (Civil Aviation Regulations 1998, Part 39)","References only one technical document (Scottish Aviation Mod. No. C347) for implementation details"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\nThis directive requires immediate action on **British Aerospace (Scottish Aviation) Twin Pioneer aircraft** — specifically regarding bolts on the undercarriage \"V\" brace and the trunnion (a pivot point) at the top of the oleo leg (the shock-absorbing strut in the landing gear).\n\n**Who it affects:**\n- Owners and operators of all models of British Aerospace (Scottish Aviation) Twin Pioneer series aeroplanes\n- Maintenance organisations servicing these aircraft\n\n**What must be done:**\nOperators must comply **\"forthwith\"** (immediately) with **Scottish Aviation Modification No. C347**. This means there's no grace period — the safety issue is serious enough that the fix must be applied right away.\n\n**Why it matters:**\nLanding gear failures are catastrophic. This AD addresses a specific mechanical defect that could cause the undercarriage to fail during takeoff or landing. The \"forthwith\" compliance indicates CASA has determined this presents an urgent safety risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sa-tp-8-bolts-on-undercarriage-v-brace-and-trunnion-at-top-of-oleo-leg","history":"/api/acts/ad-sa-tp-8-bolts-on-undercarriage-v-brace-and-trunnion-at-top-of-oleo-leg/history","analysis":"/api/acts/ad-sa-tp-8-bolts-on-undercarriage-v-brace-and-trunnion-at-top-of-oleo-leg/analysis","conflicts":"/api/acts/ad-sa-tp-8-bolts-on-undercarriage-v-brace-and-trunnion-at-top-of-oleo-leg/conflicts","importantCases":"/api/acts/ad-sa-tp-8-bolts-on-undercarriage-v-brace-and-trunnion-at-top-of-oleo-leg/important-cases","documents":"/api/acts/ad-sa-tp-8-bolts-on-undercarriage-v-brace-and-trunnion-at-top-of-oleo-leg/documents"}}