{"id":"F2006B10934","name":"AD/JETSTREAM/64 Amdt 2 - Wing/Fuselage Attachment","slug":"ad-jetstream-64-amdt-2-wing-fuselage-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56481,"registerId":"commonwealth-F2006B10934-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/64 Amdt 2 - Wing/Fuselage Attachment","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBritish Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\nAD/JETSTREAM/64\n\nAmdt 2\n\n  \nWing/Fuselage Attachment 13/97\n\nApplicability: Jetstream Series 3200 aircraft, with constructors numbers 790 through 960.\n\nRequirement: Action in accordance with BAe Regional Aircraft Mandatory Service Bulletin 57-JA 921144 Revision 3.\n\nCompliance: As specified in the requirement document.\n\nThis airworthiness directive becomes effective on 4 December 1997.\n\nBackground: Both wing/fuselage forward attachment sliding joint spigots seized on the fatigue test specimen during tests. An investigation revealed that the failure was due to inadequate lubrication between the spigot and bush. On the fatigue test specimen this had led to cracks in the spigot housing plate. Amendment 1 corrected the drilling and reaming instructions of the previous issue.\n\nAmendment 2 is issued in response to a revision of the requirement document which may require further work for operators.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 2 was issued because the requirement document was revised and “may require further work for operators,” indicating the AD’s operational scope and operator obligations have expanded or been altered relative to the earlier amendment (source: 'Amendment 2 is issued in response to a revision of the requirement document which may require further work for operators.')."},"complexity_factors":["Narrow applicability: applies only to Jetstream Series 3200 with constructors' numbers 790–960 (Applicability).","Delegation to an external technical document: compliance requires following BAe Mandatory Service Bulletin 57‑JA 921144 Revision 3 rather than detailed steps in the AD (Requirement).","Amendment-driven uncertainty: Amendment 2 follows a revision of the requirement document and “may require further work for operators”, creating potential scope changes to tasks and costs (Amendment 2).","Technical cause and inspection risk: failure mode identified as seized spigots due to inadequate lubrication on fatigue tests, implying inspections/repairs focused on lubrication and spigot/bush interfaces (Background).","Prescriptive compliance timing: AD effective from a fixed date (4 December 1997), which concentrates scheduling and compliance burden on operators in a short window (Compliance).","Limited procedural detail in the AD increases reliance on the service bulletin’s clarity and operator/maintenance provider judgement, raising implementation and verification risk."],"plain_english_summary":"Commonwealth regulator (CASA) requires operators of Jetstream Series 3200 aeroplanes (constructors' numbers 790–960) to carry out the work set out in BAe Regional Aircraft Mandatory Service Bulletin 57‑JA 921144 Revision 3. (Applicability; Requirement)\n\nThe AD responds to seized wing/fuselage forward attachment sliding joint spigots caused by inadequate lubrication during fatigue testing (Background). Operators must arrange and pay for the corrective work; CASA enforces compliance from 4 December 1997 (Compliance; effective date)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard aircraft-specific airworthiness directive. It maintains the original scope of addressing a specific structural safety defect in a defined aircraft type. The amendment simply updates the technical reference document without expanding the regulatory scope."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined term implicitly referenced (the service bulletin)","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Simple conditional structure: single applicability criterion (specific aircraft serial numbers)","Single mandatory action with compliance delegated entirely to external technical document","No nested exceptions or complex logical operators"],"plain_english_summary":"This is a **safety order for specific aircraft**.\n\n**What it does:**\nThis document is an **Airworthiness Directive (AD)** — a mandatory safety instruction issued by Australia's aviation safety regulator (CASA). It requires owners and operators of certain British Aerospace Jetstream 3200 aircraft to perform specific maintenance work on the wing-to-fuselage attachment points.\n\n**Who it affects:**\n- **Aircraft affected:** British Aerospace Jetstream Series 3200 planes with serial numbers 790 through 960\n- **People affected:** Airlines, charter operators, or private owners flying these specific aircraft\n\n**Why it matters:**\nDuring fatigue testing (simulating years of flight stress), engineers discovered that critical wing attachment components could seize up due to poor lubrication. This caused cracking in the metal housing. If this happened in actual flight, it could lead to **structural failure where the wing attaches to the fuselage** — potentially catastrophic.\n\n**What must be done:**\nOperators must follow the exact instructions in **BAe Regional Aircraft Mandatory Service Bulletin 57-JA 921144 Revision 3** — a technical maintenance manual from the manufacturer. This second amendment (Amdt 2) updates the requirements because the manufacturer revised their instructions, possibly requiring additional work beyond what earlier versions demanded.\n\n**When:** The directive took effect on 4 December 1997."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-64-amdt-2-wing-fuselage-attachment","history":"/api/acts/ad-jetstream-64-amdt-2-wing-fuselage-attachment/history","analysis":"/api/acts/ad-jetstream-64-amdt-2-wing-fuselage-attachment/analysis","conflicts":"/api/acts/ad-jetstream-64-amdt-2-wing-fuselage-attachment/conflicts","importantCases":"/api/acts/ad-jetstream-64-amdt-2-wing-fuselage-attachment/important-cases","documents":"/api/acts/ad-jetstream-64-amdt-2-wing-fuselage-attachment/documents"}}