{"id":"F2006B09770","name":"AD/F28/32 - Aileron Feel Trim Spring System - Inspection","slug":"ad-f28-32-aileron-feel-trim-spring-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54664,"registerId":"commonwealth-F2006B09770-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/32 - Aileron Feel Trim Spring System - Inspection","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\n \n\n| AD/F28/32 | Aileron Feel Trim Spring System - Inspection | 6/76 |\n| --- | --- | --- |\n| Applicability: | All models with S/Nos. 11003 to 11077 and 11991 to 11993. |  |\n| Document: | Fokker SB F28/27-122. |  |\n\n\n \n\nCompliance: At intervals not exceeding 100 hours time in service until modified in accordance with SB No. F28/27-92.\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 addressing a specific mechanical system on specific aircraft. It has not expanded beyond its original purpose of ensuring safe operation of the aileron feel trim spring system through inspection requirements."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined applicability criteria (serial number ranges)","Single compliance requirement with clear interval (100 hours)","No nested exceptions or conditional logic","No cross-references to other legislation or complex regulatory frameworks","Straightforward termination condition (modification per specified Service Bulletin)","Standard aviation regulatory format familiar to industry"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nIt requires owners and operators of certain **Fokker F28 series aeroplanes** to inspect the **aileron feel trim spring system** at regular intervals.\n\n**Who it affects:**\n- Owners and operators of Fokker F28 aircraft with serial numbers 11003 to 11077 and 11991 to 11993.\n- This covers specific models in the F28 series that have this particular system installed.\n\n**What must be done:**\n- **Inspections** must be carried out **every 100 hours of flight time** (\"time in service\" means actual flying hours, not just calendar time).\n- These repeated inspections must continue **until the aircraft is modified** according to **Service Bulletin F28/27-92** (a manufacturer's technical instruction for fixing the issue permanently).\n\n**Why it matters:**\nThe aileron feel trim spring system helps pilots control the aircraft's roll (banking left or right) and provides feedback through the control stick. If this system fails, pilots could lose proper control feel or trim capability, potentially leading to loss of control. This AD ensures the problem is caught early through inspections until a permanent fix is installed.\n\n**Key terms explained:**\n- **Airworthiness Directive (AD):** A legally enforceable safety notice that must be followed to keep an aircraft certified to fly.\n- **Service Bulletin (SB):** Technical instructions issued by the aircraft manufacturer (Fokker) describing modifications or inspections.\n- **Time in service:** Actual operating hours of the aircraft, not just time elapsed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Based on this instrument alone, the scope remains as set here: it applies only to Fokker F28 aircraft with S/Ns 11003–11077 and 11991–11993 and requires inspections every 100 hours TIS until the specified modification is carried out (Applicability; Compliance; Document). There is no indication in the text that the applicability, inspection interval, or terminating action has been altered from what the directive specifies."},"complexity_factors":["Narrow applicability limited to specific serial numbers (Applicability).","Single, simple compliance requirement: inspections at intervals not exceeding 100 hours TIS (Compliance).","Termination mechanism is a single named modification (SB No. F28/27-92) rather than multiple conditional steps (Compliance).","Technical inspection procedures are not included in the AD text but are delegated to a referenced service bulletin (Document), requiring cross-reference.","No multiple compliance pathways or exemptions detailed in the instrument itself."],"plain_english_summary":"This airworthiness directive requires inspections of the aileron feel trim spring system on specified Fokker F28 aircraft at intervals no greater than 100 flight hours until each aircraft is modified per Fokker Service Bulletin F28/27-92; inspection procedures are in Fokker SB F28/27-122.\n\nOwners/operators must bear recurring inspection and any repair costs but can eliminate the inspection requirement by performing the one‑time modification, trading ongoing maintenance burden for a single modification expense."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-32-aileron-feel-trim-spring-system-inspection","history":"/api/acts/ad-f28-32-aileron-feel-trim-spring-system-inspection/history","analysis":"/api/acts/ad-f28-32-aileron-feel-trim-spring-system-inspection/analysis","conflicts":"/api/acts/ad-f28-32-aileron-feel-trim-spring-system-inspection/conflicts","importantCases":"/api/acts/ad-f28-32-aileron-feel-trim-spring-system-inspection/important-cases","documents":"/api/acts/ad-f28-32-aileron-feel-trim-spring-system-inspection/documents"}}