{"id":"F2006B04836","name":"AD/CA25/5 - Throttle Control Grub Screw","slug":"ad-ca25-5-throttle-control-grub-screw","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44637,"registerId":"commonwealth-F2006B04836-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CA25/5 - Throttle Control Grub Screw","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)  Skyfox Aviation (Hedaro) CA25 Series Aeroplanes\n\n \n\nAD/CA25/5 Throttle Control Grub Screw 6/96\n\nApplicability: Models CA25 and CA25N to Serial No. 032.\n\n \n\nRequirement: Action in accordance with Skyfox Aviation SB No. 12 dated 18 March 1996. Compliance:              Part A of SB No 12 - Prior to further flight after 31 May 1996.\n\nPart B of SB No 12 - Within 100 hours time in service after 23 May 1996. Background:              This Directive is issued to prevent possible loss of positive engine control.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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 Airworthiness Directive maintains its original narrow scope — addressing a specific mechanical defect in a limited range of aircraft. There is no evidence of scope creep; it targets exactly what it was designed to address (throttle control security in early production CA25 series aircraft)."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined applicability criteria (model numbers and serial number range)","Simple two-part compliance structure with clear deadlines","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Single technical reference to an external service bulletin (SB No. 12)","No nested conditions, exceptions, or discretionary provisions"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific repairs or inspections on aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Skyfox Aviation CA25 series aeroplanes** (models CA25 and CA25N with serial numbers up to 032) to fix a problem with the **throttle control grub screw** — a small screw that helps secure the throttle mechanism.\n\n**What must be done:**\nOperators must follow **Service Bulletin No. 12** issued by Skyfox Aviation on 18 March 1996, which contains two parts:\n- **Part A:** Must be completed **before any further flight after 31 May 1996** — this is urgent, immediate action.\n- **Part B:** Must be completed **within 100 hours of flying time after 23 May 1996** — this is a slightly longer deadline for additional work.\n\n**Why it matters:**\nThe directive was issued to prevent **\"possible loss of positive engine control\"** — meaning the throttle could fail, causing the pilot to lose control of engine power. This is a serious safety risk that could lead to loss of the aircraft or lives.\n\n**Who it affects:**\nAnyone who owns, operates, or maintains the specified Skyfox Aviation aircraft models. Non-compliance is illegal and dangerous."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The document itself does not indicate any change in scope from an earlier or original instrument. It is an airworthiness directive that applies to specified Skyfox CA25/CA25N serial numbers and makes compliance with Skyfox Aviation SB No. 12 mandatory by set deadlines. No amendments, expansions, or narrowing of scope are recorded in the text."},"complexity_factors":["Very narrow applicability (only CA25 and CA25N models to Serial No. 032) reduces breadth but increases need to identify affected airframes precisely (Applicability).","Mandatory reliance on an external document (Skyfox Aviation SB No. 12) means the AD’s technical requirements are not self-contained (Requirement).","Two-part compliance schedule with different deadlines (Part A before further flight after 31 May 1996; Part B within 100 hours TIS after 23 May 1996) creates sequencing and scheduling considerations (Compliance).","Absence of technical detail in the AD requires operators and maintenance organisations to obtain and interpret the SB, adding administrative steps and potential ambiguity (Requirement).","Short document length and limited scope lower legal complexity but increase operational coordination complexity for affected owners/operators (Applicability; Compliance)."],"plain_english_summary":"This AD makes Skyfox Aviation Service Bulletin No. 12 mandatory for Skyfox CA25 and CA25N aircraft up to serial no. 032, requiring Part A before further flight after 31 May 1996 and Part B within 100 flight hours after 23 May 1996. Issued by the Civil Aviation Safety Authority to prevent possible loss of positive engine control, it obliges owners/operators to carry out and pay for the SB’s inspections, repairs or modifications, relying on the manufacturer’s bulletin for technical detail."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ca25-5-throttle-control-grub-screw","history":"/api/acts/ad-ca25-5-throttle-control-grub-screw/history","analysis":"/api/acts/ad-ca25-5-throttle-control-grub-screw/analysis","conflicts":"/api/acts/ad-ca25-5-throttle-control-grub-screw/conflicts","importantCases":"/api/acts/ad-ca25-5-throttle-control-grub-screw/important-cases","documents":"/api/acts/ad-ca25-5-throttle-control-grub-screw/documents"}}