{"id":"F2006B10219","name":"AD/GAF-N22/7 - Engine Oil Tank Replacement","slug":"ad-gaf-n22-7-engine-oil-tank-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55877,"registerId":"commonwealth-F2006B10219-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/7 - Engine Oil Tank Replacement","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)  GAF N22 and N24 Series Aeroplanes\n\n \n\nAD/GAF-N22/7 Engine Oil Tank Replacement 10/75\n\nApplicability: Model N22 with S/Nos. N22-1, N22-2 and N22-4. Document:  GAF SB No. N22.79.2.\n\nCompliance: Within 100 hours time in service after 28 November 1975.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument's scope is confined to the specific serial-numbered Model N22 aircraft listed in the \"Applicability\" line. The text does not indicate any expansion or narrowing relative to an earlier or original scope within the document provided."},"complexity_factors":["Very narrow applicability limited to Model N22, S/Nos. N22-1, N22-2 and N22-4 (Applicability).","Single, discrete required action (Engine Oil Tank Replacement) rather than multiple or conditional obligations.","Clear, short compliance window: within 100 hours time in service after 28 November 1975 (Compliance).","References an external technical document for procedure (GAF SB No. N22.79.2) rather than embedding detailed steps (Document).","No procedural exceptions, enforcement details, or cost/responsibility allocations included in the text, reducing internal complexity but leaving implementation questions to owners/operators or the referenced service bulletin."],"plain_english_summary":"This directive requires owners/operators of three specific GAF N22 aeroplanes (serials N22‑1, N22‑2 and N22‑4) to replace the engine oil tank per GAF SB No. N22.79.2 within 100 hours time‑in‑service after 28 November 1975. It creates a mandatory, time‑limited compliance obligation; the directive itself doesn’t allocate costs or detail the technical steps beyond pointing to the referenced service bulletin."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive affecting only three specific aircraft. It has not expanded beyond its original narrow scope."},"complexity_factors":["Extremely short document (under 100 words of substantive content)","Only 3 specific aircraft affected by serial number","Single compliance requirement with clear deadline","No defined terms section","No cross-references to other legislation beyond basic enabling regulation","Simple conditional logic: if you own one of these three planes, you must comply"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\nOrders the replacement of engine oil tanks on specific GAF N22 aircraft.\n\n**Who it affects:**\nOwners and operators of three specific GAF N22 aeroplanes with serial numbers N22-1, N22-2, and N22-4.\n\n**What must be done:**\nThe oil tank must be replaced according to the manufacturer's Service Bulletin (GAF SB No. N22.79.2) within 100 hours of flight time after 28 November 1975.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. If you don't comply, your aircraft cannot legally fly. This particular directive addresses a specific defect or safety concern with the engine oil tanks on these early-production aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-7-engine-oil-tank-replacement","history":"/api/acts/ad-gaf-n22-7-engine-oil-tank-replacement/history","analysis":"/api/acts/ad-gaf-n22-7-engine-oil-tank-replacement/analysis","conflicts":"/api/acts/ad-gaf-n22-7-engine-oil-tank-replacement/conflicts","importantCases":"/api/acts/ad-gaf-n22-7-engine-oil-tank-replacement/important-cases","documents":"/api/acts/ad-gaf-n22-7-engine-oil-tank-replacement/documents"}}