{"id":"F2006B02745","name":"AD/B727/44 - Wing Centre Section Fasteners - Replacement","slug":"ad-b727-44-wing-centre-section-fasteners-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42087,"registerId":"commonwealth-F2006B02745-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/44 - Wing Centre Section Fasteners - Replacement","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)  Boeing 727 Series Aeroplanes\n\n \n\nAD/B727/44 Wing Centre Section Fasteners - Replacement 5/67\n\nApplicability: All models. Document: Boeing SB No. 57-73. 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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The source text provides a single, narrowly framed requirement: replacement of wing centre section fasteners on all Boeing 727 models, to be carried out in accordance with Boeing SB No. 57-73 and complied with forthwith. The text contains no indication that the scope has been expanded or narrowed relative to an earlier statement of intent; it identifies the affected fleet (\"All models\") and the required action and compliance timing."},"complexity_factors":["Short, single-action directive (replace wing centre section fasteners) — low procedural complexity.","Clear applicability language: applies to all Boeing 727 models (reduces scope ambiguity).","Immediate compliance requirement (\"Forthwith\") increases operational urgency but not legal complexity.","Delegation of technical detail to external document (Boeing SB No. 57-73) — requires consultation of another document for technical compliance.","Regulatory basis is straightforward (Part 39 - 105), with standard enforcement mechanisms."],"plain_english_summary":"This airworthiness directive requires operators of all Boeing 727 series aeroplanes to replace wing centre section fasteners forthwith, using Boeing Service Bulletin No. 57‑73 as the procedural guide. CASA enforces the requirement under Part 39‑105.  \n\nAircraft owners/operators must arrange and pay for the work, manage resulting downtime and inspections, and document compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive from 1967 addressing a specific technical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating fastener replacement in Boeing 727 wing centre sections."},"complexity_factors":["Extremely short document — approximately 100 words of substantive content","No defined terms section","No cross-references to other legislation beyond the enabling regulation (CAR 1998, Part 39)","No conditional logic or exceptions — simple command structure: applicability + document reference + compliance deadline","Single operational requirement (replace fasteners) with immediate effect","Standardised AD format using conventional aviation terminology"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations.\n\n**What it does:**\nOrders owners and operators of **Boeing 727 aircraft** to replace specific fasteners (bolts/screws) in the **wing centre section** — the critical structural area where the wings join the fuselage.\n\n**Who it affects:**\n- All owners and operators of Boeing 727 series aeroplanes in Australia\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\nWing centre section fasteners are **flight-critical hardware**. If these fasteners fail in flight, the wing could separate from the fuselage with catastrophic consequences. This AD mandates immediate replacement based on Boeing Service Bulletin 57-73, which identified a defect or wear pattern requiring urgent correction.\n\n**Compliance deadline:**\n**\"Forthwith\"** — meaning immediately, before the next flight. There is no grace period.\n\n**Key details:**\n- **Document reference:** Boeing Service Bulletin No. 57-73 (the technical instructions for the repair)\n- **Applies to:** All Boeing 727 models\n- **Issued:** 1967 (indicated by \"5/67\" — May 1967)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-44-wing-centre-section-fasteners-replacement","history":"/api/acts/ad-b727-44-wing-centre-section-fasteners-replacement/history","analysis":"/api/acts/ad-b727-44-wing-centre-section-fasteners-replacement/analysis","conflicts":"/api/acts/ad-b727-44-wing-centre-section-fasteners-replacement/conflicts","importantCases":"/api/acts/ad-b727-44-wing-centre-section-fasteners-replacement/important-cases","documents":"/api/acts/ad-b727-44-wing-centre-section-fasteners-replacement/documents"}}