{"id":"F2006B09763","name":"AD/F28/26 - Fuselage Structural Bolt Connections - Inspection and Modification","slug":"ad-f28-26-fuselage-structural-bolt-connections-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54640,"registerId":"commonwealth-F2006B09763-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/26 - Fuselage Structural Bolt Connections - Inspection and 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)  Fokker F28 Series Aeroplanes\n\n \n\nAD/F28/26  Fuselage Structural Bolt NK Connections - Inspection and Modification\n\nApplicability: As detailed in the requirement document. Document:  Fokker SB F28/51-10.\n\nCompliance: Before 1 April 1976.\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":5,"scope_assessment":{"changed":false,"description":"The supplied text contains no indication that the directive's scope has been altered from its original formulation. The directive specifies the required action (inspection and modification), points to the Fokker service bulletin for applicability and technical detail, and sets a compliance date (before 1 April 1976). No amendment, narrowing or broadening of scope is evident in the provided material."},"complexity_factors":["Reliance on an external technical document (Fokker SB F28/51-10) for applicability and procedural detail increases interpretive complexity.","Applicability is not stated in the directive text (‘As detailed in the requirement document’), requiring cross‑reference to determine which aircraft/operators are covered.","Technical nature of the mandated work (structural bolt inspection and modification) requires specialist maintenance capability and judgement.","A fixed compliance deadline (before 1 April 1976) creates scheduling and operational constraints for affected operators.","The directive text is brief and does not specify enforcement, reporting, or record‑keeping procedures, leaving those questions to other materials or regulator practice.","Delegation of specifics to a manufacturer service bulletin concentrates implementation discretion in the bulletin's content and in maintenance providers."],"plain_english_summary":"This directive requires operators of the Fokker F28 aircraft listed in the referenced requirement document to inspect and modify the fuselage structural \"NK\" bolt connections, following Fokker Service Bulletin F28/51-10 for technical instructions.  \n\nThe work must be completed by 1 April 1976; affected owners/operators bear the cost and must schedule the mandated maintenance to remain compliant."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive focused on a specific technical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating fuselage bolt inspections for Fokker F28 aircraft."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section — relies entirely on external reference to Fokker Service Bulletin F28/51-10","Single, unambiguous compliance deadline with no conditional exceptions","No nested logic or cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Straightforward applicability clause ('As detailed in the requirement document')","Binary compliance structure: either the work is done by the deadline, or the aircraft is grounded"],"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 1998.\n\n**What it does:**\nThis directive requires owners and operators of **Fokker F28 series aircraft** to inspect and modify specific bolt connections in the fuselage (the main body of the plane). The work must follow instructions in **Fokker Service Bulletin F28/51-10**.\n\n**Who it affects:**\n- Airlines and operators flying Fokker F28 aircraft in Australia\n- Maintenance organisations servicing these planes\n- The aircraft themselves — they cannot legally fly unless this work is done\n\n**Why it matters:**\nStructural bolt connections hold the aircraft together. If these bolts fail, the fuselage could crack or break apart in flight. This directive was issued to prevent catastrophic structural failure.\n\n**Key requirement:**\nThe inspection and modification **must be completed before 1 April 1976**. This is a hard deadline — no extensions.\n\n**Important note:** This directive is **historical**. The compliance date of April 1976 has long passed. Any Fokker F28 still flying today would have had this work done decades ago, or would have been retired from service."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-26-fuselage-structural-bolt-connections-inspection-and-modification","history":"/api/acts/ad-f28-26-fuselage-structural-bolt-connections-inspection-and-modification/history","analysis":"/api/acts/ad-f28-26-fuselage-structural-bolt-connections-inspection-and-modification/analysis","conflicts":"/api/acts/ad-f28-26-fuselage-structural-bolt-connections-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-f28-26-fuselage-structural-bolt-connections-inspection-and-modification/important-cases","documents":"/api/acts/ad-f28-26-fuselage-structural-bolt-connections-inspection-and-modification/documents"}}