{"id":"F2006B06863","name":"AD/SD3-60/2 - Main Undercarriage Pintle Pins - Modification","slug":"ad-sd3-60-2-main-undercarriage-pintle-pins-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114741,"registerId":"commonwealth-F2006B06863-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/2 - Main Undercarriage Pintle Pins - 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\nShort SD3-60 Series Aeroplanes\n\n \n\nAD/SD3-60/2 Main Undercarriage Pintle Pins - Modification 11/83\n\nApplicability: All model SD-360 aircraft with main undercarriage units listed in Dowty Service Bulletin No. 32-11SD.\n\n \n\nDocument: Dowty Service Bulletin No. 32-11SD.\n\n \n\nNote: Shorts Service Bulletin SD 360-32-10 refers.\n\n \n\nCompliance: Before 31st October 1983.\n\n \n\nBackground: Pintle nut P/No. 200952602 is below the specified heat treatment standard.\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":2,"scope_assessment":{"changed":false,"description":"The text shows a focused airworthiness directive limited to listed main undercarriage units and prescribes a modification per a named Dowty service bulletin with a single compliance date. The instrument itself contains no indication that its scope has been altered from that stated intent."},"complexity_factors":["Narrow applicability: only SD‑360 aircraft with main undercarriage units listed in Dowty Service Bulletin No. 32‑11SD (Applicability).","Dependency on an external technical document for the required work (Document).","Single fixed compliance deadline imposes a one‑time scheduling constraint (Compliance).","Technical nature of the remedy (undercarriage pintle pin modification) requires qualified maintenance action, parts and procedures (Document; Background).","Cross‑reference to an additional manufacturer service bulletin (Shorts Service Bulletin SD 360‑32‑10) adds a secondary reference point (Note)."],"plain_english_summary":"If you own or operate an SD‑360 with undercarriage units listed in Dowty Service Bulletin No. 32‑11SD, you must have the main undercarriage pintle pins modified per that Dowty bulletin before 31 October 1983. The AD addresses a pintle nut found below heat‑treatment standard; operators arrange and pay for the one‑time modification, which is mandatory by the compliance date."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating a single hardware modification."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined applicability criterion (aircraft model and service bulletin reference)","Single compliance deadline with no conditional extensions","No nested exceptions or conditional logic","Cross-references only to external technical documents (service bulletins), not to other legislative provisions","Straightforward command structure: identify affected aircraft, cite technical standard, set deadline"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners or operators to fix a specific mechanical problem.\n\n**What it does:**\n- Orders the **modification or replacement of main undercarriage pintle pins** on certain Short SD3-60 series aircraft.\n- A \"pintle pin\" is a pivot pin that helps attach the main landing gear (undercarriage) to the aircraft structure.\n\n**Who it affects:**\n- Owners and operators of **Short SD3-60 model aircraft** that have main undercarriage units covered by **Dowty Service Bulletin No. 32-11SD**.\n\n**Why it matters:**\n- The original pintle nut (part number 200952602) was found to be **below the required heat treatment standard** — meaning it could be weaker than designed and potentially fail.\n- A failed landing gear component could cause the gear to collapse during takeoff or landing, risking serious accidents.\n\n**What must be done:**\n- The required modification must be completed **before 31 October 1983**.\n- The work must follow the instructions in **Dowty Service Bulletin No. 32-11SD** (with reference also to Shorts Service Bulletin SD 360-32-10)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-2-main-undercarriage-pintle-pins-modification","history":"/api/acts/ad-sd3-60-2-main-undercarriage-pintle-pins-modification/history","analysis":"/api/acts/ad-sd3-60-2-main-undercarriage-pintle-pins-modification/analysis","conflicts":"/api/acts/ad-sd3-60-2-main-undercarriage-pintle-pins-modification/conflicts","importantCases":"/api/acts/ad-sd3-60-2-main-undercarriage-pintle-pins-modification/important-cases","documents":"/api/acts/ad-sd3-60-2-main-undercarriage-pintle-pins-modification/documents"}}