{"id":"F2006B11278","name":"AD/ML-M4/1 - Fuel System - Modification","slug":"ad-ml-m4-1-fuel-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57083,"registerId":"commonwealth-F2006B11278-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ML-M4/1 - 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)  Maule M-4 Series Aeroplanes\n\n \n\nAD/ML-M4/1 Fuel System - Modification 11/67\n\nApplicability: All model M-4-210 with S/Nos. 1001 to 1035. Document:  Maule SL No. 7.\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\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 safety directive from 1967 (indicated by '11/67' in the identifier). It has not expanded beyond its original narrow purpose of addressing a specific fuel system defect in a limited production run of Maule aircraft. The scope remains precisely targeted at the identified safety issue."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section — all language is plain and technical-aviation standard","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Single, unambiguous compliance requirement ('Forthwith') with no conditional exceptions","Simple applicability test (specific model + serial number range)","External reference to only one technical document (Maule SL No. 7)"],"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 Maule M-4 aeroplanes to modify their fuel systems immediately.\n\n**Who it affects:** \n- **Aircraft:** All Maule M-4-210 model aeroplanes with serial numbers 1001 through 1035\n- **People:** Owners, operators, and maintenance organisations responsible for these aircraft\n\n**What must be done:**\n- **Compliance deadline:** \"Forthwith\" — meaning immediately, without delay\n- **Action required:** A fuel system modification must be carried out\n- **How to do it:** Follow the instructions in **Maule Service Letter No. 7** (the technical document referenced)\n\n**Why it matters:** Airworthiness Directives are legally binding safety instructions. They are issued when CASA identifies unsafe conditions in aircraft, engines, or equipment. Failing to comply means the aircraft cannot legally fly — it becomes \"unairworthy.\" This particular AD addresses a specific fuel system issue in early-production Maule M-4-210 aircraft that could pose a safety risk if not corrected."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text of the AD specifies its scope precisely (M‑4‑210, S/N 1001–1035) and requires immediate compliance per Maule SL No. 7. The provided document contains no indication that the scope has been expanded or narrowed relative to an earlier version; nothing in the excerpt indicates a change from an original intent."},"complexity_factors":["Narrow applicability (specific model and serial numbers): reduces legal complexity.","Single mandated action (fuel system modification) rather than multiple conditional measures.","Immediate compliance requirement (“Forthwith”) increases operational urgency and scheduling complexity.","Technical details are delegated to an external document (Maule SL No. 7), requiring readers to consult another source for full implementation steps.","Limited text provided: absence of stated rationale, costs, or enforcement detail means practical implications must be inferred from standard AD practice."],"plain_english_summary":"This AD mandates an immediate fuel‑system modification for Maule M‑4‑210 aeroplanes serials 1001–1035, to be carried out according to Maule SL No. 7. Owners/operators must arrange and fund the work forthwith, likely interrupting operations; technical steps and acceptance criteria are contained only in the referenced service letter."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ml-m4-1-fuel-system-modification","history":"/api/acts/ad-ml-m4-1-fuel-system-modification/history","analysis":"/api/acts/ad-ml-m4-1-fuel-system-modification/analysis","conflicts":"/api/acts/ad-ml-m4-1-fuel-system-modification/conflicts","importantCases":"/api/acts/ad-ml-m4-1-fuel-system-modification/important-cases","documents":"/api/acts/ad-ml-m4-1-fuel-system-modification/documents"}}