{"id":"F2006B06885","name":"AD/SD3-60/4 - Main Undercarriage Pintle Pin Bush - Modification","slug":"ad-sd3-60-4-main-undercarriage-pintle-pin-bush-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114765,"registerId":"commonwealth-F2006B06885-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/4 - Main Undercarriage Pintle Pin Bush - 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)  Short SD3-60 Series Aeroplanes\n\n \n\nAD/SD3-60/4 Main Undercarriage Pintle Pin Bush - Modification 2/84\n\nApplicability: All Model SD-360 Aircraft with S/Nos. referenced in Shorts Service Bulletin SD360-32-03.\n\n \n\nDocument: Shorts Service Bulletin SD 360-32-03. Compliance: Unless already accomplished, before 31 May 1984.\n\nBackground:  It is reported that in service damage to the rear pintle pin bush has resulted in unacceptably high friction. A P.T.F.E. liner is introduced to relieve this problem.\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, time-bound safety directive with a narrow, specific scope. It addresses exactly one technical defect in one aircraft type and does not appear to have expanded beyond its original purpose."},"complexity_factors":["Single, specific technical requirement (one modification to one component)","No defined terms section — uses standard aviation terminology","No cross-referencing to other legislation beyond the enabling Civil Aviation Regulations","Simple conditional structure: applicability based on aircraft model and serial number, with single compliance deadline","Extremely short document (approximately 150 words of substantive content)","No exceptions, exemptions, or nested conditions"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations.\n\n**What it does:**\nIt requires owners and operators of specific **Short SD3-60 series aircraft** (a type of regional turboprop plane) to modify the **main undercarriage pintle pin bush** — a component in the landing gear system.\n\n**The problem:**\nThe original rear pintle pin bush was getting damaged during normal use, causing **excessively high friction**. This could affect how the landing gear functions.\n\n**The fix:**\nInstall a **PTFE liner** (a low-friction plastic material, similar to Teflon) inside the bush to reduce wear and friction.\n\n**Who must comply:**\nAll Model SD-360 aircraft with serial numbers listed in **Shorts Service Bulletin SD360-32-03**.\n\n**Deadline:**\nThe modification had to be completed **before 31 May 1984** (unless already done).\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. Failing to comply means an aircraft cannot legally fly in Australian airspace. This particular directive prevents potential landing gear failures that could endanger passengers and crew."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD implements a single technical change described by the manufacturer’s service bulletin: fitting a P.T.F.E. liner to the rear pintle pin bush on the serial-numbered SD-360 aircraft to reduce high friction (Background; Document; Applicability). The instrument confines action to the aircraft and serial numbers referenced and sets a compliance deadline, consistent with the stated remedial purpose. There is no indication in the text provided that the scope was broadened or narrowed from that remedial intent."},"complexity_factors":["Narrow technical scope: single modification to a specific component on a specific aircraft model (Applicability; Background).","Clear compliance deadline with no staged requirements (Compliance).","Reliance on an external technical document (Shorts Service Bulletin SD 360-32-03) for implementation detail (Document).","Responsibility and costs fall directly on operators/owners; no complex cost-sharing or regulatory phasing described (Applicability; Document; Compliance).","Limited regulatory discretion within the AD itself—the AD mandates action but does not set alternative compliance pathways or exemptions in the text provided (Compliance)."],"plain_english_summary":"This AD mandates fitting a P.T.F.E. liner into the rear main-undercarriage pintle-pin bush on Model SD-360 aircraft listed in Shorts Service Bulletin SD360-32-03 to remedy in-service damage that causes unacceptably high friction. Compliance by a fixed date is required and the service bulletin provides the technical procedure.\n\nIt affects owners/operators of the listed serial-number aircraft, who must arrange and pay for parts, labour and downtime; execution and scheduling are left to the operator under the bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-4-main-undercarriage-pintle-pin-bush-modification","history":"/api/acts/ad-sd3-60-4-main-undercarriage-pintle-pin-bush-modification/history","analysis":"/api/acts/ad-sd3-60-4-main-undercarriage-pintle-pin-bush-modification/analysis","conflicts":"/api/acts/ad-sd3-60-4-main-undercarriage-pintle-pin-bush-modification/conflicts","importantCases":"/api/acts/ad-sd3-60-4-main-undercarriage-pintle-pin-bush-modification/important-cases","documents":"/api/acts/ad-sd3-60-4-main-undercarriage-pintle-pin-bush-modification/documents"}}