{"id":"F2006B02178","name":"AD/AC-100/9 - Fuel Grade Markings - Inspection and Modification","slug":"ad-ac-100-9-fuel-grade-markings-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41408,"registerId":"commonwealth-F2006B02178-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC-100/9 - Fuel Grade Markings - Inspection and Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 12/1968,Aircraft below 5700 kg,S.L. Industries Commander 100 Series and Volair 10 Series Aeroplanes,Fuel Grade Markings - Inspection and Modification,9\ntitle: Airworthiness Directive - AD/AC-100/9 - Fuel Grade Markings - Inspection and Modification\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)  S.L. Industries Commander 100 Series and Volair 10 Series Aeroplanes\n\n \n\nAD/AC-100/9 Fuel Grade Markings - Inspection and Modification 12/68\n\nApplicability: Model 100 with S/Nos. prior to 301 and model 100-180 with S/Nos. 5001 to 5100. Document:               Aero Commander Model 100 SB No. 1014.\n\nCompliance: Forthwith.\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":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific technical issue (fuel grade markings) on specific aircraft models. It has not expanded beyond its original purpose of ensuring correct fuel identification to prevent misfuelling."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined applicability criteria (specific serial number ranges)","Single cross-reference to manufacturer service bulletin (SB No. 1014)","No conditional logic or exceptions","No interpretation section or defined terms","Straightforward imperative compliance requirement ('Forthwith')","Narrow scope affecting only specific aircraft models"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority (CASA) for specific light aircraft models.\n\n**What it does:**\n- Requires owners/operators of certain **S.L. Industries Commander 100 Series and Volair 10 Series aeroplanes** to inspect and modify the fuel grade markings on their aircraft.\n- The affected aircraft are: Model 100 with serial numbers before 301, and Model 100-180 with serial numbers 5001 to 5100.\n\n**Who it affects:**\n- Owners and operators of these specific aircraft models (small aeroplanes under 5,700 kg).\n- Maintenance organisations servicing these aircraft.\n\n**Why it matters:**\n- **Safety critical:** Incorrect fuel grade markings could lead to misfuelling (putting the wrong type of fuel in the aircraft), which can cause engine failure and crashes.\n- **Immediate action required:** The directive uses \"Forthwith\" — meaning compliance is required immediately, not on a schedule.\n- **Mandatory:** This isn't a suggestion; it's a legal requirement under the Civil Aviation Regulations 1998. Non-compliance can ground an aircraft.\n\n**What needs to happen:**\nOperators must follow the manufacturer's Service Bulletin No. 1014 to inspect and correct the fuel grade markings."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied text does not indicate any change to the scope from an earlier version. The directive targets specific serial-numbered aircraft and mandates inspection/modification as per the referenced service bulletin, with immediate compliance. There is no information in the provided text showing an expansion or narrowing of that scope."},"complexity_factors":["Narrow and specific applicability: limited to particular models and serial-number ranges (Applicability).","Immediate compliance requirement: \"Forthwith\" imposes urgency and scheduling pressure (Compliance: Forthwith).","Dependency on an external technical document: the AD references Aero Commander SB No. 1014 for the procedural detail (Document: Aero Commander Model 100 SB No. 1014).","Lack of procedural detail in the AD text itself: implementers must consult the SB, increasing coordination and interpretive work.","Enforcement under Part 39 creates legal obligation but leaves technical execution to maintenance organisations, which raises record-keeping and verification needs."],"plain_english_summary":"This Airworthiness Directive (AD/AC-100/9) requires immediate (\"forthwith\") inspection and, if needed, modification of fuel-grade markings on specified Aero Commander Model 100 and 100‑180 aeroplanes, per Aero Commander Service Bulletin No. 1014.\n\nOwners/operators of the listed serial numbers must arrange and pay for the work; maintenance organisations carry it out and CASA enforces compliance under the aviation regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-100-9-fuel-grade-markings-inspection-and-modification","history":"/api/acts/ad-ac-100-9-fuel-grade-markings-inspection-and-modification/history","analysis":"/api/acts/ad-ac-100-9-fuel-grade-markings-inspection-and-modification/analysis","conflicts":"/api/acts/ad-ac-100-9-fuel-grade-markings-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-ac-100-9-fuel-grade-markings-inspection-and-modification/important-cases","documents":"/api/acts/ad-ac-100-9-fuel-grade-markings-inspection-and-modification/documents"}}