{"id":"F2006B11063","name":"AD/LA-4/12 - Fuel Pressure Restrictor Fitting - Inspection","slug":"ad-la-4-12-fuel-pressure-restrictor-fitting-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56695,"registerId":"commonwealth-F2006B11063-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LA-4/12 - Fuel Pressure Restrictor Fitting - Inspection","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)  Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes\n\n \n\nAD/LA-4/12 Fuel Pressure Restrictor Fitting - Inspection 6/74\n\nApplicability: All LA-4-200 series up to S/No. 601.\n\n \n\nDocument: 1. Lake Aircraft Division Consolidated Aeronautics SB B51.\n\n \n\n2. FAA Directive 74-09-06.\n\n \n\nCompliance: Within 25 hours time in service after 28 June 1974.\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":2,"scope_assessment":{"changed":false,"description":"The text supplied sets a single, specific requirement: inspect the fuel pressure restrictor fitting on LA-4-200 aircraft up to serial number 601 within 25 hours TIS after 28 June 1974 and to follow the procedures in Lake Service Bulletin B51 and FAA Directive 74-09-06. Nothing in the supplied text indicates an expansion, narrowing, or amendment of that original scope; therefore there is no change of scope evident in this document."},"complexity_factors":["Narrow applicability: limited to LA-4-200 series up to serial number 601 (Applicability).","Single, time-limited action: one inspection required within a fixed 25-hour TIS window after 28 June 1974 (Compliance).","Dependence on external technical documents: the AD references Lake Service Bulletin B51 and FAA Directive 74-09-06 for procedural detail (Document).","Administrative authority is explicit but procedural detail is external: CASA issues the AD under the Civil Aviation Regulations (header), creating clear authority but requiring consultation of other documents to implement.","Vintage dating: the compliance deadline and references are historic (1974), which may complicate locating applicable technical guidance or parts for contemporary compliance."],"plain_english_summary":"This directive requires a one‑time inspection of the fuel pressure restrictor fitting on Lake LA‑4‑200 aircraft (serials up to 601), to be completed within 25 hours TIS after 28 June 1974. CASA issues the requirement and owners/operators must arrange and pay for the inspection and any repairs.\n\nTechnical steps are not in the directive itself — compliance must follow Lake Service Bulletin B51 and FAA Directive 74‑09‑06 referenced in the document."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused specifically on fuel system inspections for a narrow class of aircraft. It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 1 substantive operational requirement (the inspection)","No defined terms section","No cross-references to other legislation beyond two external technical documents","Simple conditional logic: applies to specific aircraft serial numbers only","Single compliance deadline with clear metric (25 hours time in service)"],"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) that requires owners or operators of specific aircraft to take corrective action.\n\n**What it does:** It orders an **inspection of the fuel pressure restrictor fitting** on certain Lake LA-4-200 series amphibious aircraft (serial numbers up to 601). This fitting is a component in the fuel system that controls fuel pressure.\n\n**Who it affects:** Anyone who owns or operates a **Lake LA-4-200 series aircraft with serial number 601 or lower**.\n\n**What must be done:** The aircraft must be inspected within **25 hours of flying time** after 28 June 1974, following the procedures in:\n- Lake Aircraft Service Bulletin B51, and\n- FAA Directive 74-09-06 (the US aviation safety regulator's equivalent order).\n\n**Why it matters:** Airworthiness Directives are legally binding. Failure to comply means the aircraft cannot be flown legally. This particular AD addresses a potential safety defect in the fuel system that could affect engine performance or safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-la-4-12-fuel-pressure-restrictor-fitting-inspection","history":"/api/acts/ad-la-4-12-fuel-pressure-restrictor-fitting-inspection/history","analysis":"/api/acts/ad-la-4-12-fuel-pressure-restrictor-fitting-inspection/analysis","conflicts":"/api/acts/ad-la-4-12-fuel-pressure-restrictor-fitting-inspection/conflicts","importantCases":"/api/acts/ad-la-4-12-fuel-pressure-restrictor-fitting-inspection/important-cases","documents":"/api/acts/ad-la-4-12-fuel-pressure-restrictor-fitting-inspection/documents"}}