{"id":"F2006B05184","name":"AD/CESSNA 188/8 Amdt 1 - Engine Mount","slug":"ad-cessna-188-8-amdt-1-engine-mount","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45348,"registerId":"commonwealth-F2006B05184-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 188/8 Amdt 1 - 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 188 (Agwagon) Series Aeroplanes\n\n \n\n# AD/CESSNA 188/8\n\nAmdt 1\n\nApplicability: All models.\n\n# Engine Mount 6/85\n\n \n\nRequirement: Visually inspect the engine mount for cracking, paying particular attention to the rear engine mount bearers, rear cross tube, and upper firewall attach fittings.\n\n \n\nCompliance: At each issue of a new Maintenance Release.\n\n \n\nBackground: This Directive has been amended to include the firewall attachment fittings following a recent fatigue failure.\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":true,"description":"Yes. The Directive was amended to include the upper firewall attachment fittings among the engine mount areas to be inspected, following a recent fatigue failure. The Background explicitly records that the amendment added the firewall attachment fittings to the inspection requirement. (Background)"},"complexity_factors":["Narrow, specific subject matter (engine mount components named explicitly). (Requirement)","Simple mandated action: visual inspection (no specified complex testing procedures). (Requirement)","Clear timing trigger tied to Maintenance Release, but the term \"Maintenance Release\" is external to the text and requires cross-reference. (Compliance)","No detailed acceptance criteria, inspection technique, or mandatory corrective actions specified, leaving operational discretion to maintenance personnel. (Requirement)","Applies to all models of a single aircraft series, so broad applicability but limited technical scope. (Applicability)","Amendment changes scope by adding firewall attachment fittings, requiring readers to compare versions to see what was added. (Background)"],"plain_english_summary":"# What this directive does\n\nThis Airworthiness Directive (AD) requires a visual check of the engine mount on all Cessna 188 (Agwagon) series aeroplanes. The inspection must look specifically for cracks in the rear engine mount bearers, the rear cross tube, and the upper firewall attachment fittings. (Requirement)\n\nWho it applies to\n\n- All models of the Cessna 188 series. (Applicability)\n\nWhen it must be done\n\n- The inspection must be carried out at each issue of a new Maintenance Release. (Compliance)\n\nOfficial reason given\n\n- The Directive has been amended to add the firewall attachment fittings to the inspection list after a recent fatigue failure was identified. (Background)\n\nHow it works mechanically\n\n- At each new Maintenance Release, the maintenance organisation or person performing the maintenance visually inspects the engine mount parts named in the Requirement for any cracking. No specific non‑visual tests, acceptance criteria, or mandatory follow-up actions are set out in the text provided; the action required is the visual inspection itself. (Requirement, Compliance)\n\nWho pays, who decides, and what changes\n\n- Who pays: Aircraft owners or operators (or their contracted maintenance providers) bear the cost of performing the inspections and any subsequent repairs or replacements identified by the inspections. (Applicability, Compliance)\n- Who decides: Maintenance personnel or organisations determine how the visual inspection is performed and what remedial work is required if cracking is found, subject to other applicable maintenance standards and approvals that are not detailed in this AD. (Requirement)\n- Behaviour changes: Operators will need to ensure that the specified engine mount areas are visually checked at each Maintenance Release and arrange repairs where cracking is found. The amendment adds the firewall attachment fittings to the list of items to be checked, so inspection scope has expanded. (Requirement, Background)\n\nCosts, incentives and practical trade-offs\n\n- Direct costs: recurring labour time and any parts/repairs if cracking is found. (Compliance)\n- Incentive structure: The AD creates an ongoing incentive for operators to detect and remedy fatigue cracking before it causes failure; those costs are immediate and borne by operators, while the safety benefit (reduced risk of mount failure) is the intended outcome claimed in the Background. (Background)\n- Compliance burden and discretion: The AD specifies a \"visual inspection\" but does not set pass/fail criteria, measurement methods, or mandatory corrective actions in the text supplied. That introduces operational discretion for maintenance personnel and may lead to variation between different providers about when an inspection finds a defect requiring repair. (Requirement)\n- Implementation risk and substitution effects: Because the AD ties inspections to the issuance of a Maintenance Release, operators may adjust maintenance scheduling to align with that trigger. The absence of specified non‑visual tests could lead some operators or maintainers to adopt their own additional inspection techniques, at additional cost, or to rely solely on the visual check mandated here. (Compliance, Requirement)\n\nNet effect summarised\n\n- The AD places a recurring, narrowly targeted inspection duty on the parties responsible for maintenance of Cessna 188 aeroplanes (all models). It expands prior inspection scope by adding firewall attachment fittings after a fatigue failure was observed; it does not, in the text supplied, prescribe detailed inspection methods, acceptance criteria, or mandatory remedial steps beyond conducting the visual inspection at each Maintenance Release. (Applicability, Requirement, Compliance, Background)"},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This amendment represents a minor expansion of the original directive's scope — adding firewall attachment fittings to the existing inspection requirements. This is consistent with the original safety purpose (preventing engine mount failures) and does not represent mission creep beyond the directive's intent."},"complexity_factors":["Extremely short document (under 200 words)","No defined terms section","No cross-references to other legislation","Simple unconditional requirement ('visually inspect')","Single compliance trigger ('at each issue of a new Maintenance Release')","Plain language throughout with minimal aviation jargon"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety instruction issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**Who it affects:** Owners and operators of **Cessna 188 series aeroplanes** (also known as \"Agwagons\" — these are agricultural aircraft used for crop dusting and spraying).\n\n**What it requires:**\n- **Visual inspection** of the engine mount (the structure that holds the engine to the airframe)\n- **Specific focus areas:** rear engine mount bearers, rear cross tube, and upper firewall attach fittings\n- **When:** Every time a new **Maintenance Release** is issued (this is an official document certifying an aircraft is safe to fly — similar to a roadworthy certificate for a car)\n\n**Why it matters:** The directive was updated because of a **fatigue failure** (metal cracking from repeated stress over time) discovered in the firewall attachment fittings. This is serious because if the engine mount fails, the engine could detach from the aircraft in flight.\n\n**Key change in this version:** The amendment adds the firewall attachment fittings to the inspection requirements after a recent failure revealed this area was vulnerable."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-188-8-amdt-1-engine-mount","history":"/api/acts/ad-cessna-188-8-amdt-1-engine-mount/history","analysis":"/api/acts/ad-cessna-188-8-amdt-1-engine-mount/analysis","conflicts":"/api/acts/ad-cessna-188-8-amdt-1-engine-mount/conflicts","importantCases":"/api/acts/ad-cessna-188-8-amdt-1-engine-mount/important-cases","documents":"/api/acts/ad-cessna-188-8-amdt-1-engine-mount/documents"}}