{"id":"F2006B03785","name":"AD/BEECH 33/16 - Fuel System Placards","slug":"ad-beech-33-16-fuel-system-placards","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43381,"registerId":"commonwealth-F2006B03785-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 33/16 - 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 33 and 35-33 (Debonair/Bonanza) Series Aeroplanes\n\n \n\nAD/BEECH 33/16 Fuel System Placards 7/73\n\nApplicability: Models 35-33, 35-A33, 35-B33, 35-C33, E-33, F33, G33 with S/Nos. CD1 to CD- 1276.\n\n \n\nModels 35-C33A, E33A, F33A with S/Nos. CE-1 to CE-366. Models E33C, F33C with S/Nos. CJ-1 to CJ-30.\n\nRequirement: Action in accordance with Beechcraft SI 0491-281 or 0493-281 as applicable. Tank inspections are to be performed on all aircraft with baffled fuel cells unless previously inspected in accordance with AD/BEECH 33/7.\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 expanded beyond its original scope of requiring fuel system placards and tank inspections for specific Beechcraft models. The document represents the complete regulatory instrument as issued."},"complexity_factors":["Very short document (under 200 words)","Only 3 defined elements: applicability (aircraft models/serial numbers), requirement (reference to external technical documents), and compliance deadline","No nested conditional logic — single exception for aircraft already inspected under prior AD/BEECH 33/7","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998 and two specific Beechcraft service bulletins","Straightforward command structure: 'applicability → requirement → compliance'"],"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 for aircraft.\n\n**What it does:** It requires owners and operators of specific **Beechcraft Debonair and Bonanza aeroplanes** (models 35-33, E-33, F33, G33, and others listed) to install new **fuel system placards** (warning labels) and conduct **fuel tank inspections**.\n\n**Who must act:** Anyone who owns or operates the affected Beechcraft models with serial numbers in the specified ranges.\n\n**What must be done:**\n- Follow the manufacturer's instructions in **Beechcraft Service Information (SI) 0491-281 or 0493-281** — these documents detail exactly how to install the placards and inspect the tanks.\n- **Inspect the fuel tanks** on all aircraft that have \"baffled fuel cells\" (internal structures that prevent fuel sloshing), unless the aircraft was already inspected under a previous directive (AD/BEECH 33/7).\n\n**When it must be done:** Within **100 hours of flying time** after 31 July 1973.\n\n**Why it matters:** Fuel system problems can cause engine failure or fire. This directive addresses a specific safety risk in these aircraft by ensuring proper warnings are visible to pilots and that fuel tanks are checked for defects."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The provided directive sets out applicability, refers to specific Beechcraft service instructions for required actions, and imposes a compliance deadline; it also references prior AD/BEECH 33/7 for previously completed inspections. The text contains no information indicating that the scope of affected aircraft or required actions has been changed from any earlier intent within the provided material."},"complexity_factors":["Specific serial-number ranges and model variants must be checked to determine applicability (Applicability).","The AD refers to external manufacturer documents (Beechcraft SI 0491-281 or 0493-281) for the technical steps, creating a dependency on those documents (Requirement).","Conditional inspection requirement: applies to aircraft with baffled fuel cells unless already inspected under AD/BEECH 33/7, requiring operators to verify prior compliance (Requirement).","Short, fixed compliance window tied to an elapsed-hours threshold after a calendar date (100 hours TIS after 31 July 1973) adds scheduling complexity (Compliance).","The AD prescribes actions but does not enumerate the technical procedures in-line, so implementers must interpret and apply external maintenance instructions (Requirement)."],"plain_english_summary":"This AD mandates that specified Beechcraft Model 33/35-33 series aeroplanes (those in the serial-number ranges listed in the directive) complete fuel-system work per Beechcraft Service Instruction SI 0491-281 or SI 0493-281 and, where applicable, fuel-tank inspections for baffled fuel cells. Owners/operators must arrange and pay for the work, to be done within 100 hours TIS after 31 July 1973. Aircraft outside the listed serial ranges, or already inspected under AD/BEECH 33/7, are not affected."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-33-16-fuel-system-placards","history":"/api/acts/ad-beech-33-16-fuel-system-placards/history","analysis":"/api/acts/ad-beech-33-16-fuel-system-placards/analysis","conflicts":"/api/acts/ad-beech-33-16-fuel-system-placards/conflicts","importantCases":"/api/acts/ad-beech-33-16-fuel-system-placards/important-cases","documents":"/api/acts/ad-beech-33-16-fuel-system-placards/documents"}}