{"id":"F2006B10148","name":"AD/GA-7/4 - Fuel Lines - Replacement","slug":"ad-ga-7-4-fuel-lines-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55723,"registerId":"commonwealth-F2006B10148-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GA-7/4 - Fuel Lines - 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 American) GA-7 Series Aeroplanes\n\n \n\nAD/GA-7/4 Fuel Lines - Replacement NK\n\nApplicability: Model GA-7 with S/Nos. GA7-0002 to GA7-0009, GA7-0011 to GA7-0057 and GA7-0059.\n\n \n\nDocument: Gulfstream American SB No. ME-9 and Supplement 1. Compliance: Within 10 hours time in service after 12 February 1979.\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 directive’s scope is limited to requiring replacement of fuel lines on the explicitly listed GA-7 serial numbers, performed according to Gulfstream American SB No. ME-9 and Supplement 1, within 10 hours TIS after 12 February 1979. The instrument does not expand beyond that set of aircraft or the specified task in the text provided."},"complexity_factors":["Narrow, specific applicability limited to particular serial numbers (straightforward identification of affected aircraft). (Applicability)","Clear, short compliance window measured in flight hours (operational scheduling pressure). (Compliance)","Dependence on an external technical document (Service Bulletin ME-9 and Supplement 1) for the exact work scope and procedures. (Document)","No discretionary or alternative compliance route stated in the text—compliance is prescriptive. (Applicability; Compliance)","Potential implementation friction from parts availability and maintenance capacity, which the directive does not address. (Document)","Absence of explanatory rationale within the text increases the need for operators to consult the Service Bulletin and regulator for context. (Document)"],"plain_english_summary":"This Airworthiness Directive mandates replacement of fuel lines on listed Gulfstream (Grumman American) GA‑7 aeroplanes per Gulfstream American Service Bulletin No. ME‑9 (and Supplement 1), to be completed within 10 flight hours after 12 February 1979. Owners/operators of the specified serial‑numbered aircraft must arrange and fund the work; the Civil Aviation Safety Authority enforces compliance. The short flight‑hour window creates immediate scheduling, cost and downtime impacts for affected operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical defect in a limited production run of aircraft. It has not expanded beyond its original purpose of mandating fuel line replacement for safety reasons."},"complexity_factors":["Extremely short document — approximately 150 words total","Only 3 defined elements: applicability (specific serial numbers), reference document (Service Bulletin ME-9), and compliance deadline","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Single, unambiguous compliance action with clear deadline","No conditional logic, exceptions, or nested provisions","Straightforward applicability test based on aircraft serial number"],"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) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of specific Gulfstream GA-7 series aeroplanes to **replace their fuel lines**. This is a safety-critical maintenance action to prevent potential fuel leaks or failures that could lead to fire or engine failure.\n\n**Who it affects:** Only specific aircraft — Gulfstream (formerly Grumman American) GA-7 model aeroplanes with **serial numbers GA7-0002 through GA7-0009, GA7-0011 through GA7-0057, and GA7-0059**. If your plane's serial number isn't on this list, this directive doesn't apply to you.\n\n**What you must do:** Follow the technical instructions in **Gulfstream American Service Bulletin No. ME-9 and its Supplement 1** (these are manufacturer-issued repair instructions). You must complete the fuel line replacement **within 10 hours of flying time** after 12 February 1979.\n\n**Why it matters:** Fuel line failures can cause catastrophic in-flight fires or engine stoppages. This directive forces a proactive fix before accidents happen, rather than waiting for something to go wrong."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ga-7-4-fuel-lines-replacement","history":"/api/acts/ad-ga-7-4-fuel-lines-replacement/history","analysis":"/api/acts/ad-ga-7-4-fuel-lines-replacement/analysis","conflicts":"/api/acts/ad-ga-7-4-fuel-lines-replacement/conflicts","importantCases":"/api/acts/ad-ga-7-4-fuel-lines-replacement/important-cases","documents":"/api/acts/ad-ga-7-4-fuel-lines-replacement/documents"}}