{"id":"F2006B05275","name":"AD/CESSNA 207/16 - Goodyear Fuel Cells","slug":"ad-cessna-207-16-goodyear-fuel-cells","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45646,"registerId":"commonwealth-F2006B05275-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 207/16 - Goodyear Fuel Cells","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)  Cessna 207 Series Aeroplanes\n\n \n\nAD/CESSNA 207/16 Goodyear Fuel Cells 6/78\n\nApplicability: All models 207 and T207 fitted with Goodyear BTC-39 fuel cells. Requirement:  Action in accordance with Cessna SL No SE78-10.\n\nCompliance: Within 100 hours time in service after 30 June 1978 and annually thereafter as detailed in Cessna SL No SE78-10.\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 AD, as presented, sets a clear, limited scope: it applies only to Cessna 207 and T207 aeroplanes fitted with Goodyear BTC-39 fuel cells and mandates actions according to Cessna SL No SE78-10 on the stated schedule. The text contains no indication that the scope has been broadened or narrowed from an earlier version."},"complexity_factors":["The AD delegates all technical detail to an external document (Cessna SL No SE78-10), so the directive itself is short but depends on another document for implementation.","A clear compliance timetable is prescribed (initial within 100 hours TIS after 30 June 1978; annually thereafter), requiring ongoing administrative tracking.","Narrow and clearly defined applicability (only Cessna 207 and T207 with Goodyear BTC-39 fuel cells) reduces scope complexity.","The AD lacks embedded procedural steps or rationale, forcing reliance on the service letter for technical interpretation and cost estimation."],"plain_english_summary":"The CASA airworthiness directive mandates that owners/operators of Cessna 207 and T207 aircraft fitted with Goodyear BTC‑39 fuel cells must carry out the actions in Cessna Service Letter SE78‑10 — initially within 100 hours TIS after 30 June 1978 and then annually. The AD makes the service letter mandatory, creating recurring maintenance obligations and associated time/costs; the AD itself doesn’t reproduce the technical steps or rationale."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on Goodyear fuel cells in Cessna 207 aircraft. It has not expanded beyond its original safety purpose. The document appears complete as issued in 1978 (indicated by '6/78' in the directive number), with no evidence of subsequent amendments or scope creep."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined applicability criteria (aircraft model and fuel cell type)","Single cross-reference to external technical document (Cessna SL No SE78-10)","Simple temporal compliance structure (initial deadline + annual recurrence)","No nested conditions, exceptions, or defined terms section","Straightforward command structure: identify applicability → state requirement → set compliance deadline"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:** This directive requires owners and operators of specific Cessna 207 aircraft to inspect or replace Goodyear BTC-39 fuel cells (the rubber bladders inside fuel tanks that hold aviation fuel). The directive references a Cessna Service Letter (SL No SE78-10) which contains the detailed technical instructions.\n\n**Who it affects:** Anyone operating a Cessna 207 or T207 model aircraft that has Goodyear BTC-39 fuel cells installed.\n\n**What must be done:**\n- **Initial action:** Complete the required inspection or replacement within 100 hours of flight time after 30 June 1978\n- **Ongoing requirement:** Repeat this action every year thereafter\n\n**Why it matters:** Fuel cells can degrade over time, potentially leading to fuel leaks or failures. This directive ensures these critical components are checked regularly to prevent accidents caused by fuel system failures.\n\n**Key point:** The actual technical work isn't described in this document — operators must follow the separate Cessna Service Letter SE78-10 for the specific procedures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-207-16-goodyear-fuel-cells","history":"/api/acts/ad-cessna-207-16-goodyear-fuel-cells/history","analysis":"/api/acts/ad-cessna-207-16-goodyear-fuel-cells/analysis","conflicts":"/api/acts/ad-cessna-207-16-goodyear-fuel-cells/conflicts","importantCases":"/api/acts/ad-cessna-207-16-goodyear-fuel-cells/important-cases","documents":"/api/acts/ad-cessna-207-16-goodyear-fuel-cells/documents"}}