{"id":"F2006B10333","name":"AD/GY80/2 Amdt 1 - Fuel System - Modification","slug":"ad-gy80-2-amdt-1-fuel-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56089,"registerId":"commonwealth-F2006B10333-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GY80/2 Amdt 1 - Fuel System - 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\n# AD/GY80/2\n\nAmdt 1\n\nApplicability: All models.\n\n# Fuel System - Modification 1/76\n\n \n\nRequirement: Blank off the mid position on the fuel selector plate and install in its place a placard as follows:\n\n \n\n“DO NOT USE MID POSITION”. (See Flight Manual) Compliance: Before 1 April 1976.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose safety directive. It has not expanded beyond its original narrow scope of requiring a specific fuel system modification on one aircraft type."},"complexity_factors":["Extremely short document — approximately 150 words total","Zero defined terms requiring interpretation","No cross-references to other legislation (except generic reference to Flight Manual)","Single, unambiguous requirement with no exceptions or conditions","No nested logic or procedural steps beyond the physical modification","Clear compliance date with no alternative methods or phased implementation"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners to make specific repairs or modifications.\n\n**What it does:**\n- Applies to all **Aerospatiale GY 80 (Horizon)** series aeroplanes\n- Requires a simple but critical safety modification to the **fuel selector system**\n\n**The specific requirement:**\n- **Blank off** (permanently cover/disable) the \"mid position\" on the fuel selector plate\n- Install a **warning placard** reading: **\"DO NOT USE MID POSITION\"**\n- Pilots must consult their Flight Manual for further guidance\n\n**Why it matters:**\nThe mid position on the fuel selector was apparently dangerous — likely causing fuel starvation, cross-feed issues, or engine failure in flight. This directive eliminates that risk by physically preventing pilots from selecting that position.\n\n**Compliance deadline:**\nAll affected aircraft had to be modified **before 1 April 1976**.\n\n**Who it affects:**\nOwners and operators of Aerospatiale GY 80 Horizon aircraft registered in Australia."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD applies to \"All models\" of the Aerospatiale GY 80 and prescribes a single mechanical modification and placard fitment. The instrument itself does not indicate any alteration to that applicability or an expansion/narrowing of scope beyond what is stated here."},"complexity_factors":["Single, narrowly framed mechanical action (blank off selector mid position and fit placard) reduces procedural complexity.","Universal applicability to all models simplifies scope but increases the number of affected units.","Fixed, historical compliance deadline (before 1 April 1976) creates a simple binary compliance check (done/not done).","Reference to Flight Manual introduces a dependency on separate operating documentation but does not itself create new regulatory procedures.","Low regulatory discretion in the text — the AD prescribes a specific physical change rather than discretionary outcomes."],"plain_english_summary":"The Civil Aviation Safety Authority has mandated that owners/operators of all Aerospatiale GY 80 (Horizon) aircraft must have the fuel-selector mid position permanently blanked off and replace it with a placard reading “DO NOT USE MID POSITION.”  \n\nThe modification must be completed before 1 April 1976, and crews should follow the related operating instructions in the Flight Manual."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gy80-2-amdt-1-fuel-system-modification","history":"/api/acts/ad-gy80-2-amdt-1-fuel-system-modification/history","analysis":"/api/acts/ad-gy80-2-amdt-1-fuel-system-modification/analysis","conflicts":"/api/acts/ad-gy80-2-amdt-1-fuel-system-modification/conflicts","importantCases":"/api/acts/ad-gy80-2-amdt-1-fuel-system-modification/important-cases","documents":"/api/acts/ad-gy80-2-amdt-1-fuel-system-modification/documents"}}