{"id":"F2006B08161","name":"AD/CESSNA 310/34 - Main Landing Gear Trunnion - Inspection","slug":"ad-cessna-310-34-main-landing-gear-trunnion-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115336,"registerId":"commonwealth-F2006B08161-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 310/34 - Main Landing Gear Trunnion - Inspection","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 310/34 Main Landing Gear Trunnion - Inspection 9/74\n\nApplicability: All model 310Q with S/Nos. 1038 to 1145. Document:  Cessna SL No. M 74-14.\n\nCompliance: As per requirement document.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The provided AD text sets a specific, narrow scope: inspection of the main landing gear trunnion for model 310Q aircraft with serial numbers 1038–1145, using Cessna SL No. M 74-14. The document supplied contains no amendments, supersessions, or language indicating a change from an earlier or original scope; therefore there is no evidence in this text that the statutory scope has been changed."},"complexity_factors":["Narrow, clearly defined applicability (single model and a finite serial-number range) reduces scope complexity (Applicability).","Key technical and procedural details are delegated to an external document (Cessna SL No. M 74-14), which concentrates complexity in that service letter rather than in the AD text (Document; Compliance).","The AD text provides no inspection interval, acceptance criteria or corrective-action rules, requiring consultation of the requirement document and any relevant regulations for full compliance (Compliance).","Enforcement and qualification details are governed by the broader Civil Aviation Regulations framework (PART 39), adding procedural layering outside this single AD (Header)."],"plain_english_summary":"What this instrument does (mechanically)\n\n- This is an airworthiness directive (AD) that requires inspection of the main landing gear trunnion on certain Cessna 310 aeroplanes. (Title; Schedule of Airworthiness Directives)\n- It applies only to Cessna model 310Q aeroplanes with serial numbers 1038 through 1145. (Applicability)\n- The inspections must be carried out in accordance with the procedural document cited: Cessna Service Letter No. M 74-14. The AD itself delegates the exact inspection method, intervals, and any corrective actions to that requirement document. (Document; Compliance)\n\nWho is affected and who decides\n\n- Owners and operators of the affected Cessna 310Q aeroplanes are the parties that must comply. (Applicability)\n- The Civil Aviation Safety Authority (CASA) issues and enforces the AD; the technical details are set out by the manufacturer in Cessna SL No. M 74-14. (Schedule of Airworthiness Directives; Document)\n\nWhat behaviour changes and who pays\n\n- Affected operators must arrange for the specified inspection(s) of the main landing gear trunnion. (Compliance)\n- Direct costs fall on the aircraft owners/operators: labour time for inspection, any parts or repairs found necessary, and any downtime while work is done. (Applicability; Compliance)\n\nHow the instrument distributes responsibilities, discretion and compliance burden\n\n- The AD sets the legal requirement to inspect but relies on the manufacturer’s service letter for technical detail, so procedural discretion lies with the content of Cessna SL No. M 74-14 rather than in the AD text itself. (Document; Compliance)\n- Enforcement discretion is exercised by CASA under the Civil Aviation Regulations framework (PART 39 - Schedule of Airworthiness Directives). (Header)\n- The AD creates a compliance burden for a narrow, identified group of aircraft rather than a broad class. (Applicability)\n\nCosts, incentives and practical trade-offs (source-grounded)\n\n- Incentives: operators are incentivised to perform the inspections to maintain legal airworthiness status and avoid enforcement action. (Schedule of Airworthiness Directives)\n- Costs: the AD imposes inspection and potential repair costs on owners/operators; the AD text does not quantify frequency, method or cost — those are defined in the Cessna service letter. (Document; Compliance)\n- Market effects: because the AD is narrow in scope, any increase in maintenance demand is concentrated on servicing the specified serial-numbered aircraft; independent maintenance providers may perform the work provided they follow the cited requirement document and any regulatory qualifications. (Applicability; Document)\n\nImplementation risk and information gaps in the AD text\n\n- The AD references an external requirement document for details. That delegation leaves unanswered questions in the AD itself about inspection intervals, acceptance criteria, and corrective actions, requiring users to consult Cessna SL No. M 74-14 to know exact steps. (Document; Compliance)\n- The AD does not indicate whether the inspections are one-off or recurring, nor does it state who may perform them (e.g., licensed maintenance organisation vs. owner). Those points are left to the requirement document or to regulatory practice. (Compliance)\n\nSummary statement\n\n- In short: this AD legally requires inspections of the main landing gear trunnion for Cessna 310Q aeroplanes with S/N 1038–1145, and it directs operators to follow the inspection procedures and any corrective measures in Cessna SL No. M 74-14. The AD creates a compliance obligation for the listed owners/operators and places procedural detail in the referenced service letter. (Title; Applicability; Document; Compliance)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive from 1974 addressing a specific mechanical defect in a limited production run of aircraft. There is no indication of scope creep; it remains precisely focused on its original purpose of ensuring trunnion integrity in affected Cessna 310Q aircraft."},"complexity_factors":["Extremely short — only 4 substantive lines of regulatory text","No defined terms section; all language is plain technical aviation terminology","Single, unambiguous applicability criterion (specific model + serial number range)","No conditional logic, exceptions, or nested provisions","Cross-reference to only one external document (Cessna Service Letter M 74-14)","No procedural variations or alternative compliance methods stated"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of specific Cessna 310Q aircraft to inspect the **main landing gear trunnion** — that's the pivot point where the main wheels attach to the aircraft body. Think of it like checking the axle mounting point on a car, but for a plane.\n\n**Who it affects:**\nOnly Cessna 310Q model aircraft with **serial numbers 1038 to 1145**. This is a narrow, targeted group of planes.\n\n**Why it matters:**\nLanding gear failures are catastrophic. This directive likely responds to a known defect or incident pattern where these specific trunnions could crack or fail. The reference to \"Cessna SL No. M 74-14\" (a Service Letter from the manufacturer dated 1974) suggests this addresses a manufacturer-identified safety issue.\n\n**What must be done:**\nOperators must follow the inspection procedures exactly as specified in the referenced Cessna document. The directive itself doesn't spell out the inspection steps — it simply makes compliance with that external document legally mandatory."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-310-34-main-landing-gear-trunnion-inspection","history":"/api/acts/ad-cessna-310-34-main-landing-gear-trunnion-inspection/history","analysis":"/api/acts/ad-cessna-310-34-main-landing-gear-trunnion-inspection/analysis","conflicts":"/api/acts/ad-cessna-310-34-main-landing-gear-trunnion-inspection/conflicts","importantCases":"/api/acts/ad-cessna-310-34-main-landing-gear-trunnion-inspection/important-cases","documents":"/api/acts/ad-cessna-310-34-main-landing-gear-trunnion-inspection/documents"}}