{"id":"F2006B11319","name":"AD/MSR/20 - Engine Cowling Attachment Locks - Modification","slug":"ad-msr-20-engine-cowling-attachment-locks-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57174,"registerId":"commonwealth-F2006B11319-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MSR/20 - Engine Cowling Attachment Locks - Modification","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)  Aerospatiale Rallye Series Aeroplanes\n\n \n\nAD/MSR/20 Engine Cowling Attachment Locks - Modification 8/73\n\nApplicability: All model MS880B. Document: Rallye SB No. 77/2. Compliance: Before 30 November 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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive from 1973 addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original narrow purpose."},"complexity_factors":["Extremely short — only 4 substantive lines of regulatory text","No defined terms section; all language is plain operational English","Single, unambiguous compliance pathway (follow Service Bulletin 77/2)","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","No conditional logic, exceptions, or nested provisions","Clear applicability statement (single aircraft model)","Fixed, non-negotiable deadline"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA).\n\n**What it requires:** Owners and operators of specific French-made aeroplanes (the Aerospatiale Rallye MS880B series) must modify the engine cowling attachment locks. The cowling is the removable cover over the engine — if its locks fail, the cover could detach in flight, creating a serious hazard.\n\n**Who must comply:** Anyone operating an Aerospatiale Rallye MS880B aircraft.\n\n**How to comply:** Follow the instructions in \"Rallye Service Bulletin No. 77/2\" — a technical document from the manufacturer detailing exactly what modification is needed.\n\n**Deadline:** The modification had to be completed before 30 November 1973.\n\n**Why it matters:** This is a classic aviation safety measure. Engine cowlings have detached in flight before, damaging aircraft or endangering people on the ground. The directive forces operators to fix a known design weakness rather than hoping for the best."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text provides a single, clearly defined action (modify engine cowling attachment locks) applicable to all MS880B aircraft and references a specific service bulletin. There is no indication within the provided instrument that the scope was altered from an original intent; the directive consistently applies to the single named model and prescribes completion by a single compliance date (\"Applicability: All model MS880B\"; \"Compliance: Before 30 November 1973\")."},"complexity_factors":["Single, narrowly framed requirement: one modification for one aircraft model (\"Applicability: All model MS880B\").","Technical execution delegated to an external service bulletin (Rallye SB No. 77/2), creating a dependency on that document for detailed steps.","Fixed, past compliance deadline reduces procedural complexity but raises historical enforcement context questions (\"Compliance: Before 30 November 1973\").","No alternative compliance routes, exemptions, or enforcement provisions stated in the text increase clarity but shift all procedural/technical detail to the service bulletin."],"plain_english_summary":"This airworthiness directive mandates modification of the engine cowling attachment locks on all Aerospatiale Rallye MS880B aeroplanes per Rallye Service Bulletin No. 77/2, to be completed by 30 November 1973. Owners, operators and maintenance providers must arrange and pay for the work; the AD itself cites the service bulletin for technical detail and implies the change is intended to meet a specified safety standard."}},"importantCases":[],"_links":{"self":"/api/acts/ad-msr-20-engine-cowling-attachment-locks-modification","history":"/api/acts/ad-msr-20-engine-cowling-attachment-locks-modification/history","analysis":"/api/acts/ad-msr-20-engine-cowling-attachment-locks-modification/analysis","conflicts":"/api/acts/ad-msr-20-engine-cowling-attachment-locks-modification/conflicts","importantCases":"/api/acts/ad-msr-20-engine-cowling-attachment-locks-modification/important-cases","documents":"/api/acts/ad-msr-20-engine-cowling-attachment-locks-modification/documents"}}