{"id":"F2006B09756","name":"AD/F28/2 - Rudder Support Bracket Bearing - Inspection and Modification","slug":"ad-f28-2-rudder-support-bracket-bearing-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54618,"registerId":"commonwealth-F2006B09756-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/2 - Rudder Support Bracket Bearing - 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/F28/2 Rudder Support Bracket Bearing - Inspection NK\n\nand Modification\n\n \n\nApplicability: All models S/Nos. 11003, 11004, 11006, 11008 to 11013 and 11016 not modified to SB F28/27-9.\n\n \n\nDocument: Fokker SB F28/55-3.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical component of a specific aircraft type. It has not expanded beyond its original purpose of addressing the rudder support bracket bearing issue."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly referenced (the Service Bulletin)","No nested conditional logic — single applicability test (serial numbers plus exemption for already-modified aircraft)","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Straightforward command structure: inspect and modify per manufacturer's instructions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for **Fokker F28 series aircraft**.\n\n**What it does:**\n- Requires owners and operators of specific Fokker F28 planes to **inspect and modify the rudder support bracket bearing** — a component that helps the rudder (the vertical tail fin that steers the aircraft) move smoothly.\n- The directive references a **Service Bulletin (SB F28/55-3)** from Fokker, the aircraft manufacturer, which contains the technical instructions for the work.\n\n**Who it affects:**\n- Owners and operators of Fokker F28 aircraft with **serial numbers 11003, 11004, 11006, 11008 through 11013, and 11016** — **unless** they have already been modified according to an earlier service bulletin (SB F28/27-9).\n\n**Why it matters:**\n- Airworthiness Directives are **legally binding safety orders**. They are issued when a safety issue is discovered that could affect flight safety. Compliance is mandatory — you cannot legally fly the aircraft until the required inspection or modification is done.\n- This particular AD addresses a potential structural or mechanical issue with the rudder system, which is critical for controlling the aircraft during flight."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied AD text sets a narrow, serial-number-limited scope and excludes aircraft already modified to SB F28/27-9. The document does not indicate any expansion or reduction of that scope beyond the stated applicability and the reference to Fokker SB F28/55-3; no change from an earlier or different scope is evident in the supplied text. (Applicability; Document)"},"complexity_factors":["Narrow applicability by serial number (S/Nos. 11003, 11004, 11006, 11008–11013, 11016) reduces breadth but requires accurate record checks (Applicability).","Conditional exclusion for aircraft already modified to SB F28/27-9 requires verification of maintenance history (Applicability).","Technical work and exact procedures are delegated to an external document (Fokker SB F28/55-3), so implementers must obtain and follow that bulletin (Document).","Potential dependence on parts, tooling or specialist skills specified in the service bulletin increases operational uncertainty (Document).","Clear legal issuer (CASA) simplifies enforcement lines but imposes administrative duties on operators to schedule and document compliance (Header; Applicability)."],"plain_english_summary":"This AD, issued by CASA, requires inspection and any necessary modification of the rudder support bracket bearing on specified Fokker F28 airframes, by following Fokker Service Bulletin F28/55‑3. It applies only to listed serial numbers that have not already been modified under SB F28/27‑9. Registered owners/operators must check records, schedule the work if needed, and bear the costs; the SB supplies the technical instructions and determines practical time/cost impacts."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-2-rudder-support-bracket-bearing-inspection-and-modification","history":"/api/acts/ad-f28-2-rudder-support-bracket-bearing-inspection-and-modification/history","analysis":"/api/acts/ad-f28-2-rudder-support-bracket-bearing-inspection-and-modification/analysis","conflicts":"/api/acts/ad-f28-2-rudder-support-bracket-bearing-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-f28-2-rudder-support-bracket-bearing-inspection-and-modification/important-cases","documents":"/api/acts/ad-f28-2-rudder-support-bracket-bearing-inspection-and-modification/documents"}}