{"id":"F2006B05064","name":"AD/CESSNA 180/51 - Goodyear Fuel Cells","slug":"ad-cessna-180-51-goodyear-fuel-cells","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44974,"registerId":"commonwealth-F2006B05064-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 180/51 - 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 180, 182 and Wren 460 Series Aeroplanes\n\n \n\nAD/CESSNA 180/51 Goodyear Fuel Cells 6/78\n\nApplicability: All Cessna models 180 and 182 and Wren 460 fitted with Goodyear BTC-39 fuel cells.\n\n \n\nRequirement: Action in accordance with Cessna SL No. SE78-10.\n\n \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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive issued in 1978 (as indicated by '6/78' and the compliance date). It addresses a specific technical defect in a specific aircraft component. There is no evidence of scope creep; the document remains tightly focused on its original purpose of mandating inspections for Goodyear BTC-39 fuel cells in the specified aircraft models."},"complexity_factors":["Extremely short document (under 200 words)","Only 4 operative elements: applicability, requirement, compliance, and a cross-reference to external document","Single condition (aircraft model + specific fuel cell type)","Simple temporal compliance structure (one-time + recurring annual)","No defined terms section, no nested exceptions, no conditional logic beyond the applicability clause","Cross-reference to single external technical document (Cessna SL No. SE78-10) rather than multiple legislative instruments"],"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). Think of it like a compulsory recall notice, but for aircraft parts.\n\n**What it does:** It requires owners and operators of specific Cessna and Wren aircraft to inspect or replace **Goodyear BTC-39 fuel cells** (the rubber bladders inside the fuel tanks). The directive references a specific Cessna Service Letter (SE78-10) which contains the detailed technical instructions.\n\n**Who it affects:** Anyone operating:\n- Cessna 180 series aircraft\n- Cessna 182 series aircraft  \n- Wren 460 series aircraft\n\n—but **only if** those planes are fitted with Goodyear BTC-39 fuel cells.\n\n**What must be done:**\n- **First check:** Within 100 hours of flying time after 30 June 1978\n- **Ongoing:** Repeat the inspection every year after that\n\n**Why it matters:** Fuel cells can degrade, leak, or fail over time. A fuel leak in flight is obviously dangerous — fire risk, engine failure, forced landing. This AD ensures these specific fuel cells get regular safety checks to prevent accidents.\n\n**Key point:** The AD itself doesn't contain the technical \"how-to\" — it simply orders you to follow Cessna's Service Letter SE78-10. You need both documents to comply."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD text prescribes mandatory action for the identified aircraft and ties that action to Cessna Service Letter No. SE78-10 with specified timing. The directive's scope — the models and the fitted fuel cell type — is explicit in the Applicability paragraph and the compliance schedule is explicit in the Compliance paragraph. The AD text gives no indication that it alters or expands its own stated scope beyond those elements."},"complexity_factors":["Cross-reference to an external document (Cessna Service Letter No. SE78-10) — AD does not contain technical detail, requiring access to and reliance on another document (Requirement).","Recurring compliance schedule (initial within 100 hours after 30 June 1978; annual thereafter) — creates ongoing administrative burden and tracking requirements (Compliance).","Limited scope of applicability — only aircraft fitted with Goodyear BTC-39 fuel cells are covered, so applicability depends on equipment configuration (Applicability).","Lack of explicit allocation of costs, qualifications, or enforcement detail in the AD text — practical implementation depends on interpretation of the service letter and existing regulatory practice (Requirement)."],"plain_english_summary":"The Civil Aviation Safety Authority has issued AD/CESSNA 180/51 requiring operators of Cessna 180 and 182 and Wren 460 aeroplanes fitted with Goodyear BTC‑39 fuel cells to comply with the actions in Cessna Service Letter SE78‑10. The mandated work must be done within 100 hours TIS after 30 June 1978 and repeated annually. The AD makes compliance mandatory; owners/operators are responsible for arranging, performing and funding the required actions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-180-51-goodyear-fuel-cells","history":"/api/acts/ad-cessna-180-51-goodyear-fuel-cells/history","analysis":"/api/acts/ad-cessna-180-51-goodyear-fuel-cells/analysis","conflicts":"/api/acts/ad-cessna-180-51-goodyear-fuel-cells/conflicts","importantCases":"/api/acts/ad-cessna-180-51-goodyear-fuel-cells/important-cases","documents":"/api/acts/ad-cessna-180-51-goodyear-fuel-cells/documents"}}