{"id":"F2006B09814","name":"AD/F28/8 - Aileron Control Unit - Inspection and Modification","slug":"ad-f28-8-aileron-control-unit-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54744,"registerId":"commonwealth-F2006B09814-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/8 - Aileron Control Unit - 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/F28/8 Aileron Control Unit - Inspection and Modification NK\n\nApplicability: All models S/Nos. 11003 to 11029 and 11991 to 11994. Document:  Fokker SB F28/27-32.\n\nCompliance: For Part 1 - Within 50 hours time in Service after 30 Nov. 1970.\n\n \n\nFor Part 2 - Before 1 February 1971.\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 historical Airworthiness Directive from 1970 with a narrow, specific safety purpose. It has not expanded beyond its original intent — it addresses a single mechanical component on a specific aircraft type with clear compliance deadlines that have long since passed."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined compliance deadlines (Part 1 and Part 2)","Single technical reference document (Fokker SB F28/27-32)","Narrow applicability (specific serial number ranges only)","No nested exceptions, conditional logic, or cross-references to other legislation","Straightforward command structure: inspect by X date, modify by Y date"],"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 specific Fokker F28 series aircraft to inspect and modify the **aileron control unit** — that's the mechanical system that controls the small hinged surfaces on the wings (ailerons) that make the plane bank left or right.\n\n**Who it affects:**\n- All Fokker F28 aircraft with **serial numbers 11003 to 11029 and 11991 to 11994**\n- Aircraft operators, maintenance organisations, and owners of these specific planes\n\n**What must be done:**\n- **Part 1:** Inspect the aileron control unit within **50 flight hours** after 30 November 1970\n- **Part 2:** Complete modifications **before 1 February 1971**\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. They are issued when a safety defect or unsafe condition is discovered in an aircraft type. Non-compliance means the aircraft cannot legally fly in Australian airspace. This particular AD addresses potential failures in the aileron control system that could affect the pilot's ability to control the aircraft's roll, posing a serious flight safety risk.\n\n**Key document reference:**\nOperators must follow the technical instructions in **Fokker Service Bulletin F28/27-32** to complete the required work."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The source document sets the applicability and compliance requirements directly for certain Fokker F28 serial numbers and provides deadlines. The text contains no indication that the scope has been changed or amended; it defines the affected fleet and the two-part compliance schedule (see \"Applicability\" and \"Compliance\")."},"complexity_factors":["Narrow and explicit applicability (specific serial numbers) reduces scope complexity (see \"Applicability\").","Two-part compliance timing with short deadlines increases operational scheduling pressure (see \"Compliance\").","Technical requirements are delegated to an external document (Fokker SB F28/27-32), creating dependence on that bulletin for procedural detail (see \"Document\").","The AD text does not describe the tasks for Part 1 and Part 2 within itself, generating ambiguity about effort and parts required until the service bulletin is consulted (see entire directive).","Administrative burden for operators: obtaining service bulletin, planning work within windows, and documenting compliance (implied by the compliance specification)."],"plain_english_summary":"This directive requires operators of Fokker F28 aeroplanes (S/N 11003–11029, 11991–11994) to inspect and modify the aileron control unit per Fokker Service Bulletin F28/27‑32. Work is mandated on tight deadlines (Part 1 within 50 flight hours after 30 Nov 1970; Part 2 by 1 Feb 1971), imposing direct repair costs and scheduling/maintenance burdens on owners and maintenance organisations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-8-aileron-control-unit-inspection-and-modification","history":"/api/acts/ad-f28-8-aileron-control-unit-inspection-and-modification/history","analysis":"/api/acts/ad-f28-8-aileron-control-unit-inspection-and-modification/analysis","conflicts":"/api/acts/ad-f28-8-aileron-control-unit-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-f28-8-aileron-control-unit-inspection-and-modification/important-cases","documents":"/api/acts/ad-f28-8-aileron-control-unit-inspection-and-modification/documents"}}