{"id":"F2006B11066","name":"AD/LA-4/16 - Fuel Filter - Inspection","slug":"ad-la-4-16-fuel-filter-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56700,"registerId":"commonwealth-F2006B11066-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LA-4/16 - Fuel Filter - Inspection","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nConsolidated Aeronautics, Colonial and LA-4 Series Aeroplanes\n\nAD/LA-4/16 Fuel Filter \\- Inspection 8/76\n\nApplicability: All models LA-4-200 fitted with the AC GF-416 fuel filter.\n\nRequirement: 1. Remove the AC GF-416 fuel filter from the aircraft, cut open the housing and inspect the inside for corrosion. If corrosion is observed inspect the Bendix Fuel Injection Unit as follows:\n\n    (a) Remove and inspect fuel inlet strainer.\n\n    (b) Inspect housing area enclosing strainer.\n\n    (c) Remove and inspect each of the four injector nozzles P/N 2524107, including the shield P/N 2520418 and screen P/N 367687.\n\n2. If corrosion contamination is found in the fuel injector nozzle assemblies, fuel inlet strainer or housing area, replace or recondition the fuel injection unit and the flow divider P/N 2524057-2.\n\nNote: FAA AD 76-12-11 refers.\n\nCompliance: For Para. 1 \\- For filters installed 60 days or more \\- before 30 September 1976.\n\nFor filters installed less than 60 days \\- prior to attaining 90 days.\n\nThereafter \\- inspect AC GF-416 replacement filters at intervals not exceeding 90 days.\n\nFor Para. 2 \\- Before flight.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies only to LA-4-200 aircraft with the AC GF-416 fuel filter and prescribes inspection and remedial steps and timing. The instrument text does not indicate any expansion or narrowing of that applicability compared with its stated purpose."},"complexity_factors":["Technical maintenance task: removal, cutting open of fuel filter and visual inspection of internal parts (Requirement).","Multiple specific components identified by part number (inlet strainer, four injector nozzles P/N 2524107, shield P/N 2520418, screen P/N 367687, flow divider P/N 2524057-2) increasing parts-tracking complexity (Requirement).","Tiered compliance timing: different initial deadlines depending on filter installation age, then a repeated 90‑day interval (Compliance).","Immediate operational constraint: if corrosion contamination is found, replacement/reconditioning must be done before next flight (Requirement; Compliance).","Cross-reference to FAA AD (Note) requires attention to an external directive for additional guidance or consistency."],"plain_english_summary":"Owners and operators of LA-4-200 aeroplanes fitted with the AC GF-416 fuel filter must remove and open the filter to check for internal corrosion. If corrosion or contamination is found, specified fuel-injection parts (inlet strainer, injector nozzles, shields, screens, fuel injection unit and flow divider) must be inspected and repaired or replaced. Initial and recurring deadlines are prescribed: an initial inspection within 60–90 days depending on filter age, then every 90 days; contaminated parts must be fixed before flight (Requirement; Compliance)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific known defect (corrosion in AC GF-416 fuel filters) in a specific aircraft type. It has not expanded beyond its original purpose."},"complexity_factors":["Single, specific aircraft model and single component targeted","Only 2 main requirements with clear conditional logic (if corrosion found → inspect further; if contamination found → replace before flight)","No defined terms section — all part numbers and technical references are explicit","Simple compliance timeline with only two initial categories (60+ days vs under 60 days) plus ongoing 90-day interval","No cross-references to other legislation beyond a single note referencing the corresponding FAA directive","Total length: approximately 200 words"],"plain_english_summary":"Owners and operators of Consolidated Aeronautics LA-4-200s fitted with AC GF-416 fuel filters (and their maintenance engineers) must remove and inspect that filter for internal corrosion. If corrosion is found, the fuel inlet strainer, its housing and all four injector nozzles (shields/screens) must be checked; any contamination requires repair or replacement of the fuel injection unit and flow divider before flight.\n\nThis prevents engine failure from fuel-system corrosion, especially hazardous over water."}},"importantCases":[],"_links":{"self":"/api/acts/ad-la-4-16-fuel-filter-inspection","history":"/api/acts/ad-la-4-16-fuel-filter-inspection/history","analysis":"/api/acts/ad-la-4-16-fuel-filter-inspection/analysis","conflicts":"/api/acts/ad-la-4-16-fuel-filter-inspection/conflicts","importantCases":"/api/acts/ad-la-4-16-fuel-filter-inspection/important-cases","documents":"/api/acts/ad-la-4-16-fuel-filter-inspection/documents"}}