{"id":"F2006B10075","name":"AD/G159/31 - Engine Fire Extinguisher Switch - Inspection","slug":"ad-g159-31-engine-fire-extinguisher-switch-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55522,"registerId":"commonwealth-F2006B10075-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G159/31 - Engine Fire Extinguisher Switch - 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 ORDERS CIVIL AVIATION SAFETY AUTHORITY                            PART 105 SCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  GULFSTREAM (GRUMMAN) G.159 SERIES AEROPLANES\n\n \n\nAD/G159/31 Engine Fire Extinguisher Switch - Inspection 5/77\n\nApplicability: All Gulfstream 1 and TC4C aircraft. Document:  Grumman Customer Bulletin No. 292.\n\nCompliance: Within 100 hours time in service after 31 May 1977.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued in 1977. It has not evolved beyond its original purpose of mandating a specific inspection on specific aircraft types. Airworthiness directives are typically standalone instruments that remain in force until complied with or superseded, and this one maintains its narrow, original scope."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","Zero defined terms in the directive itself (relies on external reference to Grumman Customer Bulletin No. 292 for technical details)","No cross-references to other legislation or CASA regulations within the directive text","Simple conditional structure: single applicability criterion (aircraft type) and single compliance deadline","No exceptions, exemptions, or nested conditions","External document incorporated by reference, but this is standard practice for airworthiness directives"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to all **Gulfstream G.159 series aeroplanes** (also known as the Grumman Gulfstream I) and the military variant **TC4C**.\n\n**What it requires:**\n- Aircraft owners/operators must **inspect the engine fire extinguisher switch** on these planes.\n- The inspection must follow the procedure outlined in **Grumman Customer Bulletin No. 292**.\n- **Deadline:** Complete the inspection within **100 hours of flying time** after 31 May 1977.\n\n**Why it matters:**\nFire extinguisher switches are critical safety equipment. This directive likely addresses a discovered defect or failure mode that could prevent pilots from activating fire suppression systems during an engine fire — a potentially catastrophic situation. The directive ensures all affected aircraft in Australia are checked and fixed if necessary.\n\n**Who it affects:**\n- Owners and operators of Gulfstream I and TC4C aircraft registered in Australia\n- Maintenance organisations servicing these aircraft types"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument itself sets a single, specific requirement that applies to the named aircraft types. The document contains no indication that the scope was altered from any earlier text; it applies to all Gulfstream 1 and TC4C aeroplanes as stated (Applicability)."},"complexity_factors":["Narrow, clearly defined applicability (all Gulfstream 1 and TC4C aircraft) reduces operational ambiguity (Applicability).","Single, time-limited action (one inspection within 100 hours after a specified date) simplifies compliance scheduling but creates a short deadline (Compliance).","Substantive procedural detail is delegated to an external document (Grumman Customer Bulletin No. 292), requiring operators to obtain and follow that bulletin (Document).","No in-text specification of corrective measures increases reliance on the external bulletin and maintenance judgement, adding interpretive complexity (Document).","Regulatory enforcement rests with CASA; operators must integrate the directive with existing maintenance programs and inspections, which adds modest planning complexity (Compliance)."],"plain_english_summary":"This directive mandates a one-time inspection of the engine fire extinguisher switch on Gulfstream (Grumman) G.159 series (Gulfstream 1/TC4C) aircraft, to be performed per Grumman Customer Bulletin No. 292 within 100 hours’ time-in-service after 31 May 1977. Aircraft owners/operators must arrange and pay for the inspection and any follow-up work; maintenance organisations execute the work and CASA enforces the compliance deadline, creating a short-term mandatory safety check with scheduling and cost implications."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g159-31-engine-fire-extinguisher-switch-inspection","history":"/api/acts/ad-g159-31-engine-fire-extinguisher-switch-inspection/history","analysis":"/api/acts/ad-g159-31-engine-fire-extinguisher-switch-inspection/analysis","conflicts":"/api/acts/ad-g159-31-engine-fire-extinguisher-switch-inspection/conflicts","importantCases":"/api/acts/ad-g159-31-engine-fire-extinguisher-switch-inspection/important-cases","documents":"/api/acts/ad-g159-31-engine-fire-extinguisher-switch-inspection/documents"}}