{"id":"F2006B06914","name":"AD/SD3-60/9 Amdt 1 - Nose Undercarriage Main Fitting","slug":"ad-sd3-60-9-amdt-1-nose-undercarriage-main-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114794,"registerId":"commonwealth-F2006B06914-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/9 Amdt 1 - Nose Undercarriage Main Fitting","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/SD3-60/9\n\nAmdt 1\n\n\nNose Undercarriage Main Fitting 13/87\n\n \n\nApplicability: All model SD3-60 aircraft with nose undercarriage units listed in Dowty Rotol Service Bulletin No 32-26 SD.\n\n \n\nRequirement: Action in accordance with Dowty Rotol Service Bulletin No 32-26 SD. Compliance:  Prior to the issue of a Certificate of Airworthiness.\n\nBackground:  The manufacturer has reported an instance of cracking on the cylindrical wall of the main fitting. This amendment makes typographical changes only.\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 amendment makes typographical changes only and does not alter the substantive requirements of the airworthiness directive. The AD continues to require action in accordance with Dowty Rotol Service Bulletin No 32-26 SD for the same set of affected SD3-60 aircraft, with compliance required prior to issue of a Certificate of Airworthiness. (Background; Requirement; Compliance)"},"complexity_factors":["Narrow, clearly defined applicability (only SD3-60 aircraft with nose undercarriage units listed in Dowty Rotol Service Bulletin No 32-26 SD). (Applicability)","Single external technical document supplies substantive remedial steps (Dowty Rotol Service Bulletin No 32-26 SD). (Requirement)","Clear, single compliance trigger (must be done prior to issue of a Certificate of Airworthiness). (Compliance)","Amendment limited to typographical changes, so no added substantive legal complexity from this amendment. (Background)"],"plain_english_summary":"What this instrument does\n\n- It requires owners/operators of certain Short SD3-60 aeroplanes to carry out the actions set out in Dowty Rotol Service Bulletin No 32-26 SD that relate to the nose undercarriage main fitting. (Requirement)\n- The requirement applies to all SD3-60 aircraft that have nose undercarriage units listed in that Dowty Rotol service bulletin. (Applicability)\n- The actions must be completed before a Certificate of Airworthiness is issued for the aircraft. (Compliance)\n\nWho it affects\n\n- Aircraft owners/operators and the maintenance organisations that service Short SD3-60 aeroplanes which have the specific Dowty Rotol nose undercarriage units identified in Service Bulletin No 32-26 SD. (Applicability, Requirement)\n\nWhy it matters (mechanical effects and incentives)\n\n- The manufacturer reported cracking in the cylindrical wall of the nose undercarriage main fitting; the mandatory action implements the manufacturer’s service bulletin to address that problem. (Background, Requirement)\n- Mechanically, the rule requires inspection and any corrective work described in the Dowty Rotol service bulletin to be completed before a Certificate of Airworthiness can be issued, creating a timing constraint on returning affected aircraft to service. (Requirement, Compliance)\n\nWho pays, who decides, and what behaviour changes\n\n- The duty to carry out the service-bulletin actions falls to the aircraft owner/operator or their contracted maintenance organisation; they will therefore bear the direct costs of inspections, repairs or replacements called for by the service bulletin. (Applicability, Requirement)\n- Civil Aviation Safety Authority enforces the airworthiness directive by conditioning issue of the Certificate of Airworthiness on compliance. That enforcement mechanism gives CASA the practical means to require completion of the service-bulletin work prior to initial airworthiness certification. (Compliance)\n- The behaviour change required is procedural and operational: affected aircraft must receive the specified maintenance action before being certified as airworthy, and maintenance providers will perform work to the manufacturer’s instructions. (Requirement, Compliance)\n\nImplementation, trade-offs and risks\n\n- The technical content and remedial steps are delegated to the manufacturer’s service bulletin; the AD makes compliance with that external document mandatory. This concentrates technical detail in an external source while the AD sets the legal condition for certification. (Requirement)\n- The instrument imposes a one-off or periodic maintenance/compliance cost on a defined set of owners/operators and may delay issuance of Certificates of Airworthiness until work is done. (Requirement, Compliance)\n- The amendment notes that it makes typographical changes only, indicating the substance of the mandatory actions was not altered in this amendment. That limits implementation uncertainty arising from this particular amendment. (Background)\n\nSource citations: Applicability; Requirement; Compliance; Background."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a minor amendment to an existing Airworthiness Directive. The scope remains exactly as originally intended: addressing a specific structural defect in a specific aircraft type. The amendment explicitly states it makes 'typographical changes only', confirming no scope creep."},"complexity_factors":["Extremely short document (approximately 150 words of substantive content)","Only 1 defined term implicitly referenced (the Service Bulletin)","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Simple conditional structure: single applicability criterion and single compliance deadline","No nested exceptions or conditional logic","Amendment makes only typographical changes, indicating minimal substantive complexity"],"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 like a recall notice for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of specific **Short SD3-60 Series aeroplanes** (a type of regional turboprop aircraft) to inspect or fix a problem with the **nose undercarriage main fitting** — that's the structural component that holds the front landing gear in place.\n\n**Who must follow it:** Anyone who owns or operates a Short SD3-60 aircraft with a nose undercarriage unit covered by **Dowty Rotol Service Bulletin No 32-26 SD** (a technical notice from the parts manufacturer).\n\n**What action is required:** Operators must follow the instructions in that Dowty Rotol Service Bulletin. This must be done **before the aircraft can be issued a Certificate of Airworthiness** — meaning the plane cannot be legally flown until this is fixed.\n\n**Why it matters:** The manufacturer found **cracking in the cylindrical wall of the main fitting** — a structural defect that could cause the nose landing gear to fail. This is a serious safety risk.\n\n**What's new in this version (Amendment 1):** Only **typographical changes** — corrections to spelling, formatting, or similar errors. No changes to the actual safety requirements."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-9-amdt-1-nose-undercarriage-main-fitting","history":"/api/acts/ad-sd3-60-9-amdt-1-nose-undercarriage-main-fitting/history","analysis":"/api/acts/ad-sd3-60-9-amdt-1-nose-undercarriage-main-fitting/analysis","conflicts":"/api/acts/ad-sd3-60-9-amdt-1-nose-undercarriage-main-fitting/conflicts","importantCases":"/api/acts/ad-sd3-60-9-amdt-1-nose-undercarriage-main-fitting/important-cases","documents":"/api/acts/ad-sd3-60-9-amdt-1-nose-undercarriage-main-fitting/documents"}}