{"id":"F2006B10887","name":"AD/JETSTREAM/2 - Propeller Ice and Rain Protection - Modification","slug":"ad-jetstream-2-propeller-ice-and-rain-protection-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56416,"registerId":"commonwealth-F2006B10887-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/2 - Propeller Ice and Rain Protection - 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)  British Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\n \n\n# AD/JETSTREAM/2  Propeller Ice and Rain Protection - Modification\n\nApplicability: Jetstream Series 3100 aircraft. Constructors numbers 601 to 645. Requirement: Service Bulletin 30-JM7453 Revision 1.\n\nCompliance: Before further flight after 31 May 1985.\n\n# 1/85\n\n \n\nBackground:  The manufacturer has introduced a revised propeller de-icing system to resolve the problems of induced vibrations occuring during icing encounters at low ambient temperatures.\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 technical defect in a limited aircraft population. It has not expanded beyond its original purpose of mandating a propeller de-icing system modification."},"complexity_factors":["Extremely short document — only 4 substantive paragraphs","No defined terms section — all terms are plain English or standard aviation terminology","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Single, unambiguous compliance requirement with a hard deadline","No conditional logic, exceptions, or alternative compliance methods","Narrow applicability — specific aircraft model and construction number range only"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA).\n\n**What it does:**\nIt requires owners and operators of specific British Aerospace Jetstream 3100 aircraft to modify their propeller de-icing (ice and rain protection) systems.\n\n**Who it affects:**\n- Owners and operators of **Jetstream Series 3100 aircraft** with construction numbers 601 through 645\n- This is a specific subset of the Jetstream fleet, not all Jetstream aircraft\n\n**What must be done:**\n- Install a **revised propeller de-icing system** as specified in **Service Bulletin 30-JM7453 Revision 1** (a technical instruction from the manufacturer)\n- This modification must be completed **before the aircraft flies again after 31 May 1985**\n\n**Why it matters:**\nThe original propeller de-icing system was causing **dangerous vibrations** when the aircraft encountered icing conditions at low temperatures. Icing is a serious flight hazard — ice buildup on propellers can cause vibration, loss of efficiency, and potentially catastrophic failure. This directive fixes a known safety defect before it causes an accident.\n\n**In short:** If you own one of these specific 45 Jetstream aircraft, you cannot fly it past May 1985 unless you've upgraded the propeller ice protection system to prevent dangerous vibrations in cold, icy conditions."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument’s scope aligns with its stated purpose in the text: it applies to Jetstream Series 3100 aircraft with constructors' numbers 601–645 and requires the modification described in Service Bulletin 30-JM7453 Revision 1 to address induced propeller vibrations in icing. The directive prescribes the mandatory technical remedy and a firm compliance date; there is no indication in the supplied text that the scope deviates from that stated purpose. (Applicability; Requirement; Compliance; Background)"},"complexity_factors":["Narrow and specific applicability (Jetstream Series 3100, constructors numbers 601–645) reduces scope complexity. (Applicability)","Single, clear mandatory action: adopt Service Bulletin 30-JM7453 Revision 1. (Requirement)","Hard compliance deadline requiring action before any flight after 31 May 1985 imposes operational scheduling pressure. (Compliance)","Relies on an external technical document (the Service Bulletin) for implementation detail, creating reliance on maintenance interpretation and parts supply. (Requirement)","Safety-critical nature increases regulatory strictness and reduces discretionary flexibility for operators and maintenance providers. (Background; Requirement)"],"plain_english_summary":"This directive mandates a specific propeller ice/rain protection modification (per Service Bulletin 30‑JM7453 Rev 1) on BAe Jetstream Series 3100 aircraft (c/n 601–645), to be completed before any flight after 31 May 1985. It affects owners, operators and maintenance organisations, who must pay for parts, labour and downtime. CASA makes compliance compulsory to eliminate induced propeller vibrations in icing at low temperatures; affected aircraft cannot lawfully fly until the work is done."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-2-propeller-ice-and-rain-protection-modification","history":"/api/acts/ad-jetstream-2-propeller-ice-and-rain-protection-modification/history","analysis":"/api/acts/ad-jetstream-2-propeller-ice-and-rain-protection-modification/analysis","conflicts":"/api/acts/ad-jetstream-2-propeller-ice-and-rain-protection-modification/conflicts","importantCases":"/api/acts/ad-jetstream-2-propeller-ice-and-rain-protection-modification/important-cases","documents":"/api/acts/ad-jetstream-2-propeller-ice-and-rain-protection-modification/documents"}}