{"id":"F2006B05048","name":"AD/CESSNA 180/36 - Brake Line Adaptor","slug":"ad-cessna-180-36-brake-line-adaptor","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44958,"registerId":"commonwealth-F2006B05048-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 180/36 - Brake Line Adaptor","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 180, 182 and Wren 460 Series Aeroplanes\n\n \n\nAD/CESSNA 180/36 Brake Line Adaptor 9/73\n\nApplicability: Model 182 with S/Nos. 18261540 to 18262021. Requirement:  Action in accordance with Cessna SL No. SE73-16. Compliance:               Within 100 hours time in service after 28 September 1973.\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 AD as supplied applies only to the specified Cessna 182 serial numbers and requires action per Cessna SL No. SE73-16 within a defined time-in-service window. There is no indication in the supplied text that the AD's scope has been amended or expanded from its original wording; the AD identifies the affected models/serials, the external service letter to follow, and the compliance horizon without further qualification (see \"Applicability\", \"Requirement\", \"Compliance\")."},"complexity_factors":["Narrow applicability defined by a short serial-number range reduces legal and operational ambiguity (\"Applicability: Model 182 with S/Nos. 18261540 to 18262021\").","Requirement delegates technical detail to an external document (Cessna SL No. SE73-16), introducing a dependency on accessing and interpreting that service letter (\"Requirement\").","Compliance deadline measured in hours time in service requires accurate logbook/flight-hour records (\"Compliance: Within 100 hours time in service after 28 September 1973\").","Legal placement in the CASA Airworthiness Directives schedule provides clear enforcement authority but presumes familiarity with regulatory enforcement mechanisms (header referencing Civil Aviation Regulations and CASA).","The AD text is brief and procedural; complexity for operators depends mainly on the technical content of the referenced service letter, which is not included here."],"plain_english_summary":"- What this directive does (mechanically): It requires owners/operators of certain Cessna 182 aeroplanes to carry out the corrective action described in Cessna Service Letter SE73-16. The directive identifies the affected aircraft by serial number and sets a deadline measured in flying time: the work must be done within 100 hours time in service after 28 September 1973. (See \"Applicability\", \"Requirement\", \"Compliance\".)\n\n- Who it affects: Owners, operators and maintainers of Cessna 182 aeroplanes with serial numbers 18261540 through 18262021; and any maintenance organisation engaged to carry out the work. (See \"Applicability\".)\n\n- Who decides and enforces: The directive appears in the Civil Aviation Safety Authority schedule of Airworthiness Directives under the Civil Aviation Regulations framework; that framework is the legal authority under which the requirement is issued and enforced. The AD directs action to follow the manufacturer's service letter. (See header and \"Requirement\".)\n\n- What the operator must do and when: Obtain and follow Cessna Service Letter SE73-16 and complete the specified work within 100 hours time in service after 28 September 1973. The AD does not reproduce the technical steps; it makes compliance conditional on following the service letter. (See \"Requirement\" and \"Compliance\".)\n\n- Who pays and what are the immediate costs: The operator/owner pays for the inspection/repair/modification work and for any aircraft downtime while the action is carried out, because the AD mandates the work but does not allocate funding. The text of the AD does not state any cost-sharing or compensation. (Inferred from the AD structure: \"Requirement\" and \"Compliance\".)\n\n- Incentives and behavioural effects: The AD creates a clear legal incentive to perform the specific corrective action within the stated flight-hour window to remain compliant. It channels technical detail to the manufacturer’s service letter, which concentrates the procedural authority in that document. This means operators must obtain and follow the service letter to meet the AD requirement. (See \"Requirement\".)\n\n- Compliance burden and implementation risks: Compliance requires access to Cessna SL No. SE73-16 and either in-house maintenance capability or contracting an outside maintenance provider to carry out the work. The AD measures the deadline in hours time in service, which requires accurate flight-time records. If the service letter is unclear or hard to obtain, that raises implementation friction; the AD itself does not supply the technical steps. (See \"Requirement\" and \"Compliance\".)\n\n- Effects on competition and independent providers: Because the AD refers to a manufacturer service letter (rather than prescribing a single authorised workshop), independent maintenance providers can comply by following the same service letter procedures if they have the technical competence and access to the service letter. The AD does not specify exclusive providers. (See \"Requirement\".)\n\n- Trade-offs and opportunity costs: The operator must choose between performing the mandated work (with direct monetary and downtime costs) and deferring operations on the affected aeroplanes until compliance is achieved. The AD sets a limited window (100 hours TIS after the specified date), so operators face scheduling and potential substitution costs (grounding or leasing alternatives) while achieving compliance. (See \"Compliance\" and \"Applicability\".)\n\n- What the AD does not state: The short text does not state the precise safety problem, estimated cost, or an extended rationale beyond the title \"Brake Line Adaptor\"; it also does not reproduce the technical instructions, leaving those details to Cessna SL No. SE73-16. (See title and \"Requirement\".)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive from 1973 with a narrow technical scope (brake line adaptors on specific aircraft). It has not expanded beyond its original purpose."},"complexity_factors":["Extremely short document (under 200 words)","Only 4 operative provisions: applicability, requirement, compliance deadline, and reference to external technical document","No defined terms section","No cross-references to other legislation beyond the enabling regulations (Civil Aviation Regulations 1998, Part 39)","Single, unambiguous compliance condition (100 hours time in service after fixed date)","Narrow applicability (specific model and serial number range)"],"plain_english_summary":"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:**\nOrders owners and operators of specific Cessna aircraft to inspect or fix a problem with **brake line adaptors** (connection points in the aircraft's braking system).\n\n**Who it affects:**\n- **Aircraft:** Cessna Model 182 aeroplanes (a type of small, single-engine plane)\n- **Serial numbers:** Only those built between serial numbers 18261540 and 18262021\n- **Note:** The heading mentions Cessna 180 and Wren 460 series, but the actual applicability section narrows this to just the specific Model 182 serial number range\n\n**What must be done:**\n- Follow the instructions in **Cessna Service Letter No. SE73-16** (a technical bulletin from the manufacturer)\n- Complete the work **within 100 hours of flying time** after 28 September 1973\n\n**Why it matters:**\nBrake failures in aircraft can be catastrophic. This AD ensures potentially faulty brake line adaptors are identified and fixed before they cause an accident. Non-compliance is illegal and the aircraft cannot fly legally until the work is done."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-180-36-brake-line-adaptor","history":"/api/acts/ad-cessna-180-36-brake-line-adaptor/history","analysis":"/api/acts/ad-cessna-180-36-brake-line-adaptor/analysis","conflicts":"/api/acts/ad-cessna-180-36-brake-line-adaptor/conflicts","importantCases":"/api/acts/ad-cessna-180-36-brake-line-adaptor/important-cases","documents":"/api/acts/ad-cessna-180-36-brake-line-adaptor/documents"}}