{"id":"F2006B10332","name":"AD/GY80/1 - Fuel System - Inspection and Modification","slug":"ad-gy80-1-fuel-system-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56088,"registerId":"commonwealth-F2006B10332-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GY80/1 - Fuel System - Inspection and 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)  Aerospatiale GY 80 (Horizon) Series Aeroplanes\n\n \n\nAD/GY80/1 Fuel System - Inspection and Modification 10/69\n\nApplicability: All models with S/Nos. prior to No. 125.\n\n \n\nRequirement: 1. Inspect the fuel supply lines from each wing tank where they pass through the wing-root/fuselage structure for any evidence of chafing. If chafing has occurred replace the affected pipes.\n\n \n\n2.    In the region where the fuel supply lines pass through the wing-root and fuselage structure, protect the pipes against possible chafing by means of a suitable piece of split rubber hose secured around the pipe in the critical area; or\n\n \n\n3.    Sud Aviation SB No. 28. Compliance: 25 November 1969.\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, single-issue airworthiness directive from 1969 addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Extremely short document (under 200 words)","Only 3 operative requirements (inspect, replace if needed, protect)","Single defined applicability criterion (serial numbers prior to 125)","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Simple alternative compliance path (rubber hose OR manufacturer's bulletin)","No nested conditions, exceptions, or defined terms section","Clear, imperative language throughout"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Aerospatiale GY 80 (Horizon) series aeroplanes** to inspect and fix a specific fuel system problem.\n\n**Who it affects:**\nAnyone who owns or operates an Aerospatiale GY 80 aircraft with a **serial number below 125**.\n\n**The safety problem:**\nThe fuel supply lines that run from the wing tanks through the wing-root/fuselage area can rub against the aircraft structure (called \"chafing\"). This wear could eventually cause fuel leaks — a serious fire hazard.\n\n**What must be done:**\n- **Inspect** those fuel lines for any signs of rubbing damage\n- If damage is found: **replace the pipes**\n- Regardless of damage, **protect the pipes** by wrapping them with split rubber hose in the critical area, OR\n- Follow the manufacturer's Service Bulletin (SB No. 28) from Sud Aviation\n\n**Deadline:**\nAll work must be completed by **25 November 1969**.\n\n**Why it matters:**\nThis is a classic aviation safety intervention — catching a design weakness before it causes an accident. Fuel leaks near hot engine components or electrical systems can lead to catastrophic fires. The directive gives operators a choice between a simple protective fix (rubber hose) or the manufacturer's official modification procedure."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD’s scope remains the same as stated in the instrument: it applies to all Aerospatiale GY 80 (Horizon) aeroplanes with serial numbers prior to 125 (Applicability). The text contains no amendments or broadened applicability; it prescribes inspection and remediation options (Requirements 1–3) with a fixed compliance date (Compliance)."},"complexity_factors":["Narrow applicability: limited to Aerospatiale GY 80 series with serial numbers prior to 125 (Applicability).","Simple, discrete actions required: inspect, replace if chafed, and protect with split rubber hose or follow SB No. 28 (Requirement 1–3).","Clear compliance deadline: single stated date (Compliance: 25 November 1969).","Technical execution requires licensed maintenance personnel and parts, creating practical but not legal complexity (Requirement 1–2).","One alternative compliance route (Sud Aviation SB No. 28) adds minor decision complexity (Requirement 3)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Aerospatiale GY‑80 (Horizon) aeroplanes (serials before 125) to inspect fuel supply pipes where they pass the wing‑root/fuselage and, if chafing is found, replace or protect them to prevent fuel leakage. Compliance (by 25 Nov 1969) falls to maintenance organisations and licensed engineers. Operators may fit a split rubber sleeve or follow Sud Aviation Service Bulletin No. 28 as an alternative."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gy80-1-fuel-system-inspection-and-modification","history":"/api/acts/ad-gy80-1-fuel-system-inspection-and-modification/history","analysis":"/api/acts/ad-gy80-1-fuel-system-inspection-and-modification/analysis","conflicts":"/api/acts/ad-gy80-1-fuel-system-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-gy80-1-fuel-system-inspection-and-modification/important-cases","documents":"/api/acts/ad-gy80-1-fuel-system-inspection-and-modification/documents"}}