{"id":"F2006B08145","name":"AD/CESSNA 310/18 - Fuel System - Modification","slug":"ad-cessna-310-18-fuel-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115303,"registerId":"commonwealth-F2006B08145-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 310/18 - Fuel System - Modification","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 310 Series Aeroplanes\n\n \n\nAD/CESSNA 310/18 Fuel System - Modification 8/69\n\nApplicability: All model 310 with S/Nos. 35000 to 35546. Model 310A with S/Nos. 38001 to 38161. Model 310B with S/Nos. 607, 35547, 35548, 35549, 35551 to 35771. Model\n\n310C with S/Nos. 35550, 35772 to 35999, 39000 to 39031. Model 310D with S/Nos. 39032 to 39299. Model 310E with S/Nos. 35912A, 310M0001 to 310M0036. Model\n\n310F with S/Nos. 3100001 to 3100156.\n\n \n\nRequirement: Cessna SL 310-66.\n\n \n\nCompliance: Within 100 hours time in service after 1 August 1969.\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, single-issue airworthiness directive focused specifically on fuel system modifications for a defined aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words)","No defined terms section — all language is plain technical aviation terminology","No cross-references to other legislation beyond the enabling regulation (Civil Aviation Regulations 1998, Part 39)","Single, unambiguous compliance requirement with clear deadline","Applicability determined by simple serial number ranges — no conditional logic or exceptions","No nested provisions or subordinate clauses"],"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) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of specific Cessna 310 series aircraft to modify their fuel systems. The modification must follow Cessna Service Letter 310-66 (a technical bulletin from the manufacturer).\n\n**Who it affects:** Owners and operators of specific Cessna 310 models with particular serial numbers, including:\n- Model 310 (S/Nos. 35000–35546)\n- Model 310A (S/Nos. 38001–38161)\n- Model 310B, 310C, 310D, 310E, and 310F (with specific serial number ranges listed)\n\n**Why it matters:** Airworthiness Directives are legally binding safety requirements. If you own or operate one of these aircraft, you **must** complete this fuel system modification within 100 hours of flying time after 1 August 1969. Non-compliance means the aircraft cannot legally fly in Australian airspace.\n\n**Key deadline:** The work had to be done within 100 hours of flight time after 1 August 1969 (note: this is a historical directive from 1969, though ADs remain in force until complied with or superseded)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive’s scope is the original targeted set of aircraft listed under \"Applicability\" and the single mandated action in the \"Requirement\". The AD does not expand beyond those serial-numbered models or alter the nature of the mandated modification; it prescribes the modification per Cessna SL 310-66 and a fixed compliance window (100 hours TIS after 1 August 1969), so the scope as expressed in this text remains the same as its stated purpose."},"complexity_factors":["Narrow, specific applicability: multiple Cessna 310 models tied to precise serial-number ranges increases administrative detail (\"Applicability\").","External technical reference: the substantive work is delegated to a manufacturer service letter (Cessna SL 310-66), requiring operators to obtain and follow that document (\"Requirement\").","Short compliance window expressed in flight hours and anchored to a historical date (100 hours TIS after 1 August 1969) requires operators to track time-in-service accurately (\"Compliance\").","Mandatory nature with limited discretion: the AD prescribes a single corrective action rather than options, concentrating implementation requirements on owners/operators.","Implicit operational impact: while text is short, practical implementation may involve parts sourcing, qualified maintenance labour and downtime scheduling, which introduces logistical complexity."],"plain_english_summary":"What this directive does (mechanically):\n\n- It requires certain Cessna 310-series aeroplanes to have their fuel system modified in accordance with Cessna Service Letter SL 310-66. (See: \"Requirement\").\n- The rule applies only to the specific models and serial-number ranges listed in the directive. (See: \"Applicability\").\n- Owners/operators had to complete the modification within 100 hours time-in-service after 1 August 1969. (See: \"Compliance\").\n\nWho is affected and who decides:\n\n- Affected parties are the owners and operators of the listed Cessna 310 models and serial numbers. (See: \"Applicability\").\n- The Civil Aviation Safety Authority issued the directive under the Commonwealth airworthiness rules; the directive prescribes the mandatory action (follow SL 310-66). The operator/owner is responsible for arranging and paying for the work. (See: \"Requirement\" and \"Compliance\").\n\nWhy it matters (stated purpose and practical testing of that purpose):\n\n- Stated purpose (inferred from the title and requirement): to effect a modification to the fuel system by implementing Cessna SL 310-66. The AD itself does not include a detailed statement of the underlying hazard; it prescribes the modification as the required corrective action. (See: title and \"Requirement\").\n\n- Costs and who pays: owners/operators pay for parts, labour and aircraft downtime to carry out the modification. The directive creates a direct compliance cost (parts and maintenance hours) and an opportunity cost in aircraft availability during the work window. (See: \"Requirement\" and \"Compliance\").\n\n- Implementation trade-offs and risks: the work must follow the manufacturer’s service letter; this requires access to the service instructions, appropriate parts and suitably qualified maintenance personnel. Risks include delays if parts or workshop capacity are limited, and potential recordkeeping or installation errors if not done per SL 310-66. (See: \"Requirement\").\n\n- Compliance burden and enforcement: the AD sets a clear, short compliance window (100 hours TIS after 1 August 1969). It leaves little operational discretion to defer or alter the mandated modification; enforcement would be through the regulator’s airworthiness oversight. Operators bear the burden of scheduling and proving compliance. (See: \"Compliance\").\n\n- Effects on private choice and markets: the directive compels a specific technical change rather than providing optional alternatives, so affected owners must either pay to modify the aircraft or limit operations if non-compliant. Maintenance providers stand to gain work from the mandatory modification, while aircraft availability for owners may be temporarily reduced. (See: \"Requirement\" and \"Compliance\").\n\nConcrete mechanics in short: the AD identifies which serial-numbered aircraft must be modified, mandates following Cessna SL 310-66, and required completion within a limited flight-time window after 1 August 1969. (See: \"Applicability\", \"Requirement\", \"Compliance\")."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-310-18-fuel-system-modification","history":"/api/acts/ad-cessna-310-18-fuel-system-modification/history","analysis":"/api/acts/ad-cessna-310-18-fuel-system-modification/analysis","conflicts":"/api/acts/ad-cessna-310-18-fuel-system-modification/conflicts","importantCases":"/api/acts/ad-cessna-310-18-fuel-system-modification/important-cases","documents":"/api/acts/ad-cessna-310-18-fuel-system-modification/documents"}}