{"id":"F2006B08138","name":"AD/CESSNA 310/10 - Inboard Aileron Hinges - Replacement","slug":"ad-cessna-310-10-inboard-aileron-hinges-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115283,"registerId":"commonwealth-F2006B08138-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 310/10 - Inboard Aileron Hinges - Replacement","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 310/10 Inboard Aileron Hinges - Replacement 7/61\n\nApplicability: All model 310, 310B and 310C prior to S/No. 35774. Document:  Cessna SL No. 310-60, Supplement No. 1.\n\nCompliance: Forthwith.\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\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 addressing a specific mechanical defect in a defined aircraft population. It has not expanded beyond its original purpose of mandating hinge replacement for flight safety."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 3 defined applicability criteria (model numbers and serial number cutoff)","Single compliance requirement with no conditional exceptions or alternative methods","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No nested definitions or interpretive provisions","References only one external technical document (Cessna Service Letter)","Binary applicability test (serial number below/above threshold)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA).\n\n**What it does:**\nIt requires owners and operators of specific Cessna 310 aircraft to **replace the inboard aileron hinges** (the hinges on the inner part of the small control surfaces on the wings that help steer the plane).\n\n**Who it affects:**\n- All **Cessna 310, 310B, and 310C** model aircraft\n- **Only those with serial numbers below 35774** (older aircraft in this series)\n\n**Why it matters:**\nAileron hinges are critical for flight control. If they fail, the pilot could lose the ability to roll or bank the aircraft, potentially causing a crash. This directive was issued because the original hinges were found to be unsafe — likely due to a design flaw, fatigue, or manufacturing defect discovered after these planes entered service.\n\n**What must be done:**\n- **Compliance: \"Forthwith\"** — meaning immediately, without delay. This is the most urgent compliance category in aviation safety regulation.\n- The replacement must follow the technical instructions in **Cessna Service Letter No. 310-60, Supplement No. 1** (the manufacturer's official repair guidance).\n\n**In short:** If you own one of these specific Cessna planes, you cannot legally fly it until you replace these hinges according to the manufacturer's instructions."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The document is titled as a \"Replacement\" but the text supplied states only the mandatory replacement action, the affected models/serials, the service-letter reference, and immediate compliance. There is no information in the supplied text showing an expansion or narrowing of scope relative to an earlier instrument; therefore there is no evident change of scope from an earlier intent within the supplied material."},"complexity_factors":["Narrow applicability (specific models and serial-number cutoff) reduces breadth of affected parties (Applicability).","Immediate compliance requirement increases operational urgency and potential logistical complexity for affected operators (Compliance: Forthwith).","Technical standard and procedure are external to the text and are contained in a referenced manufacturer service letter, requiring access to and interpretation of that document (Document: Cessna SL No. 310-60, Supplement No. 1).","Physical work (hinge replacement) requires maintenance skill, parts and downtime, creating practical implementation complexity distinct from legal complexity.","Lack of embedded technical detail in the directive shifts complexity to maintenance execution and supply-chain availability rather than legal interpretation."],"plain_english_summary":"### What this instrument does, in mechanical terms\n\nThis Airworthiness Directive (AD) requires the inboard aileron hinge(s) on certain Cessna 310-series aeroplanes to be replaced. The directive applies to all model 310, 310B and 310C aircraft with serial numbers prior to 35774 and directs compliance immediately (\"Forthwith\"). The replacement procedure is to be carried out in accordance with the referenced Cessna Service Letter: Cessna SL No. 310-60, Supplement No. 1 (see Applicability; Document; Compliance).\n\n### Who is affected\n\n- Aircraft owners and operators of Cessna 310, 310B and 310C aeroplanes with S/No. before 35774 (Applicability).\n- Maintenance organisations and licensed engineers who perform the replacement in accordance with the referenced Cessna service letter (Document).\n- The Civil Aviation Safety Authority (CASA) or equivalent regulator enforces compliance (Instrument is an AD in the CASA schedule).\n\n### Why it matters (stated purpose and practical effects)\n\n- The instrument's title and mandatory requirement indicate its purpose is to ensure those aircraft have the inboard aileron hinges replaced. The text supplied does not state the hazard analysis or incident prompting the AD; it only prescribes replacement (AD/CESSNA 310/10 Inboard Aileron Hinges - Replacement; Compliance: Forthwith).\n\n- Practical effects: affected aircraft will be taken out of service for maintenance until the replacement is done; owners/operators will incur the cost of parts, labour and downtime; maintenance providers will perform the work under the referenced service letter.\n\n### Who pays, who decides, and what behaviour changes\n\n- Who pays: aircraft owners/operators pay for parts, labour and downtime for the replacement (the AD imposes the action on the operator; see Applicability and Compliance).\n- Who decides: the regulator issues the AD and requires compliance; the owner/operator and their maintenance provider decide how and when to execute the replacement, subject to the immediate compliance requirement (Compliance: Forthwith; Document reference governs the work standard).\n- Behaviour changes: operators must schedule and complete the hinge replacement immediately; maintenance providers must follow the referenced Cessna service letter.\n\n### Compliance burden and implementation risk\n\n- Compliance is immediate, so owners may face urgent scheduling, parts procurement and aircraft downtime (Compliance: Forthwith).\n- The work standard is set by a manufacturer service letter; operators rely on the availability and clarity of that document for execution (Document: Cessna SL No. 310-60, Supplement No. 1).\n- Potential risks: if replacement parts are scarce, operators could face longer grounding periods; if the service letter is unclear, maintenance discretion increases and variation in execution could arise.\n\n### Effects on private enterprise and market considerations\n\n- Independent maintenance organisations can perform the replacement provided they follow the service letter; the AD does not on its face restrict who may do the work, but it does require adherence to the referenced procedure (Document).\n- The requirement may raise short-term maintenance demand for the affected models, increasing workload for parts suppliers and MROs; it may raise short-run costs for owners (Applicability; Compliance).\n- The directive changes a private actor's (owner/operator's) immediate maintenance obligations and imposes a compulsory capital/service outlay; it does not on its face change ownership rights or longer-term economic use beyond the need to carry out the replacement.\n\n### Trade-offs and opportunity costs\n\n- Operators must divert funds and downtime to meet the mandatory replacement rather than other uses (Compliance: Forthwith).\n- The AD relies on a manufacturer service letter to set the technical standard; the opportunity cost is dependence on that single source for method and parts (Document).\n\n### Summary citations\n\n- Applicability: \"All model 310, 310B and 310C prior to S/No. 35774.\" (Applicability)\n- Required action: replacement of inboard aileron hinges (title: \"Inboard Aileron Hinges - Replacement\").\n- Technical reference: \"Cessna SL No. 310-60, Supplement No. 1.\" (Document)\n- Timing: \"Compliance: Forthwith.\" (Compliance)\n\nNote: the supplied text gives the mandatory action, the affected fleet, the technical reference and the immediacy of compliance. The text does not include the hazard analysis, cost estimates, part numbers, detailed procedures, or any grandfathering/exemptions; those details (if any) would be in the referenced service letter or in a fuller AD record."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-310-10-inboard-aileron-hinges-replacement","history":"/api/acts/ad-cessna-310-10-inboard-aileron-hinges-replacement/history","analysis":"/api/acts/ad-cessna-310-10-inboard-aileron-hinges-replacement/analysis","conflicts":"/api/acts/ad-cessna-310-10-inboard-aileron-hinges-replacement/conflicts","importantCases":"/api/acts/ad-cessna-310-10-inboard-aileron-hinges-replacement/important-cases","documents":"/api/acts/ad-cessna-310-10-inboard-aileron-hinges-replacement/documents"}}