{"id":"F2006B03837","name":"AD/BEECH 35/39 - Fuel System Placards","slug":"ad-beech-35-39-fuel-system-placards","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43446,"registerId":"commonwealth-F2006B03837-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 35/39 - Fuel System Placards","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)  Beechcraft 35 (Bonanza) Series Aeroplanes\n\n \n\nAD/BEECH 35/39 Fuel System Placards 7/73\n\nApplicability: All models with S/Nos. D-1 to D-9319.\n\n \n\nRequirement: Action in accordance with Beechcraft SIs 0491-281, 0493-281 or 0495-281 as applicable. Tank inspections are to be performed on all aircraft with baffled fuel cells unless previously inspected in accordance with AD/BEECH 35/28.\n\n \n\nCompliance: Within 100 hours time in service after 31 July 1973.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose airworthiness directive from 1973. It has not grown beyond its original scope — it addresses one specific safety issue (fuel system placards and tank inspections) for one aircraft series. The document appears complete and unamended in this version."},"complexity_factors":["Very short document — only 4 substantive paragraphs","Minimal defined terms (only standard aviation abbreviations like 'S/Nos' for serial numbers)","Simple conditional logic: one exception ('unless previously inspected')","No cross-references to other legislation beyond a single prior AD reference","Clear, specific compliance deadline and applicability criteria","Relies on external technical documents (Beechcraft Service Instructions) for detailed procedures rather than embedding complex technical requirements in the text itself"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** Requires owners and operators of certain Beechcraft 35 (Bonanza) series aeroplanes to install new fuel system placards (warning/instruction labels) and conduct fuel tank inspections.\n\n**Who it affects:** All Beechcraft 35 models with serial numbers D-1 through D-9319 — these are older Bonanza aircraft, mostly built from the late 1940s through early 1970s.\n\n**The specific requirements:**\n- **Placards:** Install new labels on the fuel system following specific Beechcraft Service Instructions (SI 0491-281, 0493-281, or 0495-281 — which one depends on your specific aircraft model)\n- **Tank inspections:** Check the fuel tanks on all aircraft that have \"baffled fuel cells\" (internal structures that reduce fuel sloshing), **unless** the tanks were already inspected under a previous directive (AD/BEECH 35/28)\n\n**When it had to be done:** Within 100 hours of flying time after 31 July 1973.\n\n**Why it matters:** Fuel system failures and fuel starvation are serious safety risks in aviation. This directive addressed a known safety issue with these aircraft — likely related to fuel management, venting, or quantity indication — by ensuring pilots had clear, accurate information via updated placards and that fuel tanks were inspected for defects."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive as written sets a limited, specific scope: Beechcraft 35 series aeroplanes with serial numbers D-1 to D-9319 and, for tank inspections, only those with baffled fuel cells (Applicability; Requirement). It does not expand or narrow that scope within the text, and it relies on existing manufacturer SIs and a prior directive (AD/BEECH 35/28) for exemptions. Based on the text provided, there is no indication the scope has been changed from what the instrument establishes."},"complexity_factors":["Short, focused directive with a single clear requirement and a single compliance deadline","Cross-references to external manufacturer service instructions (SIs 0491-281, 0493-281, 0495-281) which are not reproduced in the text","Reference to a prior airworthiness directive (AD/BEECH 35/28) for an exemption, creating a need to check historical compliance records","Technical execution depends on the content of the referenced SIs (implementation detail outside the AD)","Serial-number and equipment (baffled fuel cell) based applicability increases administrative checks to determine which aircraft are in scope"],"plain_english_summary":"Owners and operators of Beechcraft 35 (serials D‑1 to D‑9319) must carry out the manufacturer’s specified service instructions and inspect baffled fuel cells (unless already done under a prior AD), completing the work within 100 hours TIS after 31 July 1973. Costs and scheduling fall to operators/maintenance organisations. The measure ensures correct fuel‑system placarding and integrity of baffled fuel tanks by mandating actions in the applicable Beechcraft SIs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-35-39-fuel-system-placards","history":"/api/acts/ad-beech-35-39-fuel-system-placards/history","analysis":"/api/acts/ad-beech-35-39-fuel-system-placards/analysis","conflicts":"/api/acts/ad-beech-35-39-fuel-system-placards/conflicts","importantCases":"/api/acts/ad-beech-35-39-fuel-system-placards/important-cases","documents":"/api/acts/ad-beech-35-39-fuel-system-placards/documents"}}