{"id":"F2006B10018","name":"AD/G1159/17 - Stall Barrier System In-Line Filters - Replacement","slug":"ad-g1159-17-stall-barrier-system-in-line-filters-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55398,"registerId":"commonwealth-F2006B10018-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G1159/17 - Stall Barrier System In-Line Filters - Replacement","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)  Gulfstream (Grumman) G1159 and G-IV Series Aeroplanes\n\n \n\nAD/G1159/17 Stall Barrier System In-Line Filters - Replacement 8/75\n\nApplicability:  Model G1159 with S/Nos. 1 to 164 and 775. Document: Grumman Aircraft Service Change No. 199. Compliance:   As detailed in the requirement document.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied AD text sets a specific replacement requirement for stall barrier system in-line filters on Model G1159 aircraft with serial numbers 1–164 and 775 and refers to Grumman Aircraft Service Change No. 199 for the details (Applicability; Document; Compliance). The text supplied contains no indication of an amendment to, or change from, an earlier scope or intent. No earlier version or historical comparison is included in the supplied material, so there is no evidence in this text that the scope has changed from any prior instrument."},"complexity_factors":["Narrow applicability limited to specific airframe model and serial numbers (Applicability)","Primary technical detail is contained in an external document (Grumman Aircraft Service Change No. 199), increasing dependency on that document for full compliance (Document; Compliance)","Compliance requirement in the AD text is terse: \"As detailed in the requirement document,\" which requires operators to consult and interpret the external Service Change (Compliance)","Regulatory provenance is clear (CASA under Civil Aviation Regulations 1998, Part 39), but the supplied text lacks timelines, enforcement details, or procedural steps, requiring cross-reference to other materials (header; Compliance)","Operational impacts (parts, labour, downtime) are implied but not quantified in the AD text, so cost estimation requires further technical documents or supplier information (Document; Compliance)"],"plain_english_summary":"The Airworthiness Directive requires replacement of the stall‑barrier system in‑line filters on specified Gulfstream G1159/G‑IV aeroplanes (serial numbers 1–164 and 775), with technical steps and timing set by Grumman Aircraft Service Change No. 199. \n\nIt applies to aircraft owners/operators (who must arrange and pay for the work) and to maintenance organisations that will perform it; compliance is mandatory under CASA’s Part 39 authority and may create parts, labour and downtime costs."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific maintenance action for a specific aircraft type. It has not expanded beyond its original purpose of ensuring Stall Barrier System reliability."},"complexity_factors":["Extremely short document (under 150 words)","Only one substantive requirement: replace specific filters","Single cross-reference to external technical document (Grumman Service Change No. 199)","Limited applicability (specific serial numbers only)","No defined terms section, no conditional logic, no exceptions","Standard AD format with minimal procedural content"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of specific Gulfstream G1159 aeroplanes (serial numbers 1 to 164, plus 775) to replace the **in-line filters** in their **Stall Barrier System**.\n\n**What is a Stall Barrier System?** It's a safety device that prevents aircraft stalls (when wings lose lift). The in-line filters keep contaminants out of this critical system. If they clog or fail, the stall protection could malfunction — potentially leading to loss of control.\n\n**Who must comply:** Anyone operating the affected Gulfstream models (G1159 and G-IV series, specifically the listed serial numbers).\n\n**How to comply:** Follow the technical instructions in **Grumman Aircraft Service Change No. 199**.\n\n**Why it matters:** This is about preventing catastrophic failure of a flight-critical safety system. Non-compliance means the aircraft cannot legally fly in Australian airspace."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g1159-17-stall-barrier-system-in-line-filters-replacement","history":"/api/acts/ad-g1159-17-stall-barrier-system-in-line-filters-replacement/history","analysis":"/api/acts/ad-g1159-17-stall-barrier-system-in-line-filters-replacement/analysis","conflicts":"/api/acts/ad-g1159-17-stall-barrier-system-in-line-filters-replacement/conflicts","importantCases":"/api/acts/ad-g1159-17-stall-barrier-system-in-line-filters-replacement/important-cases","documents":"/api/acts/ad-g1159-17-stall-barrier-system-in-line-filters-replacement/documents"}}