{"id":"F2006B05102","name":"AD/CESSNA 185/12 - Engine Mount","slug":"ad-cessna-185-12-engine-mount","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45086,"registerId":"commonwealth-F2006B05102-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 185/12 - Engine Mount","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 185 Series Aeroplanes\n\n \n\nAD/CESSNA 185/12 Engine Mount 7/68\n\nApplicability: All models.\n\n \n\nRequirement: Visually inspect the engine mount for cracking, with particular attention to the rear engine bearers and rear cross tube.\n\n \n\nCompliance: At intervals not exceeding 100 hours time in service.\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":1,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused specifically on engine mount inspections for one aircraft type. It has not expanded beyond its original narrow technical purpose."},"complexity_factors":["Extremely short document — only 4 substantive lines","Zero defined terms requiring interpretation","No cross-references to other legislation or regulations","Simple unconditional mandate: inspect at set intervals","No exceptions, exemptions, or conditional logic","Single applicability criterion ('All models') with no ambiguity"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for **Cessna 185 series aeroplanes**.\n\n**What it does:**\n- Requires owners and operators to **visually inspect the engine mount** (the metal framework that holds the engine to the aircraft body)\n- Specifically focuses on checking for **cracks in the rear engine bearers and rear cross tube** (critical structural parts that bear heavy loads)\n\n**Who it affects:**\n- Anyone who owns or operates any model of Cessna 185 aircraft\n- Maintenance engineers who service these planes\n\n**Why it matters:**\n- Engine mount cracks can lead to **catastrophic engine failure or separation** in flight\n- The 100-hour inspection interval ensures problems are caught before they become dangerous\n- Compliance is **legally mandatory** — flying without completing this inspection violates civil aviation regulations\n\n**Key requirement:** The inspection must be done **every 100 hours of flight time** (\"time in service\" means actual operating hours, not calendar time)."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD text sets its own scope: it applies to all Cessna 185 models (Applicability) and requires a specified inspection at intervals not exceeding 100 hours TIS (Compliance). There is no language in the provided text that expands or narrows that stated scope beyond these provisions."},"complexity_factors":["Short, single-purpose directive (visual inspection) with a clear inspection interval (Compliance).","Broad applicability to all Cessna 185 models (Applicability) reduces case-by-case complexity.","Lack of prescribed remedial action or detailed inspection standard creates operational ambiguity and discretionary decision-making for maintainers (Requirement).","Potential inspection effectiveness uncertainty because only visual inspection is mandated (Requirement).","Regulatory enforcement and airworthiness consequences implicit rather than specified in the AD text (form-level context)."],"plain_english_summary":"What this instrument does (mechanically)\n\n- Requires owners/operators of Cessna 185 series aeroplanes to conduct a visual inspection of the engine mount for cracking. The inspection must pay particular attention to the rear engine bearers and the rear cross tube. (Requirement)\n- Applies to all Cessna 185 models. (Applicability)\n- Specifies the inspection interval: at intervals not exceeding 100 hours time in service. (Compliance)\n\nStated purpose and practical implications\n\n- The AD is presented as a condition-detection requirement: it directs regular visual checks to identify cracking in engine-mount structure. The AD itself does not set out the corrective steps to take if cracking is found; it only prescribes inspection and the interval. (Requirement, Compliance)\n\nWho pays and who decides\n\n- Owners/operators pay the costs of complying (labour for inspections and any follow-up repairs or replacements). (Applicability, Requirement)\n- The Civil Aviation Safety Authority issues and enforces the AD; operators must follow it to maintain airworthiness status. (Source: the AD form and header)\n\nBehaviour changes and incentives\n\n- Operators must schedule and carry out inspections every 100 hours TIS or more frequently. That creates recurring maintenance workload and possible aircraft downtime. (Compliance)\n- Detecting cracking will create an incentive to repair or replace engine-mount components; those remedial costs are borne by owners/operators. (Implicit from Requirement)\n- Maintenance providers may see increased demand for inspections and repairs on affected aircraft. (Implicit from Requirement)\n\nCompliance burden, discretion and implementation risks\n\n- Compliance burden: the AD specifies a visual inspection only, which is relatively low-cost in equipment terms but still requires qualified personnel and scheduling. The interval (<= 100 hours TIS) creates a recurring burden. (Requirement, Compliance)\n- Discretion: the AD does not describe acceptable inspection standards, pass/fail criteria, or mandatory corrective actions when cracking is found. That leaves interpretation and remedial decisions to maintenance organisations, certificated engineers, or the regulator in enforcement cases. (Requirement)\n- Implementation risk: because the AD prescribes a visual inspection (not non-destructive testing or replacement), subsurface or hairline cracks that are not visible could be missed. The AD does not mitigate that risk by requiring any particular inspection method. (Requirement)\n\nMarket and operational effects (description, not judgement)\n\n- On private enterprise: the requirement increases recurring maintenance demand for Cessna 185 owners/operators and for maintenance businesses that service them. (Applicability, Requirement)\n- On prices and productivity: owners may face higher operating costs (inspection labour, potential repairs) and occasional downtime; maintenance providers may see higher workload. (Compliance)\n- On contract freedom and ownership: aircraft owners remain free to choose maintenance providers subject to regulatory and airworthiness obligations; they are obliged to ensure the inspections occur. (Applicability, Requirement)\n\nTrade-offs and opportunity costs\n\n- The AD trades recurring inspection cost and potential downtime against the stated objective of detecting cracking in the engine mount. The AD chooses a simple, repeatable visual inspection at a fixed flight-hour interval, which reduces procedural complexity but may leave some detection risk unaddressed because no more advanced inspection method is mandated. (Requirement, Compliance)\n\nSummary sentence\n\n- In short: this AD requires all Cessna 185 operators to visually inspect the engine mount (focus: rear engine bearers and rear cross tube) every 100 hours TIS or less; owners/operators pay for inspections and any repairs, and the AD leaves technical judgement about remedial action to certifying maintenance personnel or regulator enforcement. (Applicability, Requirement, Compliance)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-185-12-engine-mount","history":"/api/acts/ad-cessna-185-12-engine-mount/history","analysis":"/api/acts/ad-cessna-185-12-engine-mount/analysis","conflicts":"/api/acts/ad-cessna-185-12-engine-mount/conflicts","importantCases":"/api/acts/ad-cessna-185-12-engine-mount/important-cases","documents":"/api/acts/ad-cessna-185-12-engine-mount/documents"}}