{"id":"F2006B11335","name":"AD/MSR/8 - Engine Cooling - Modification","slug":"ad-msr-8-engine-cooling-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57215,"registerId":"commonwealth-F2006B11335-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MSR/8 - Engine Cooling - 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/8 Engine Cooling - Modification 11/64\n\nApplicability: All MS880 Series with S/Nos. 5001 to 5330, 5336 to 5345, and 5377. Document:  1. Rallye SB No. 30; or\n\n2. Bureau Veritas Airworthiness Spec. 64-8-8. Compliance: Forthwith.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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, targeted safety directive for a specific aircraft type. It has not expanded beyond its original purpose of mandating an engine cooling modification for identified aircraft."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 3 defined applicability criteria (specific serial number ranges)","Simple binary compliance pathway (two acceptable documents)","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No conditional logic, exceptions, or nested provisions","Single operative requirement with immediate effective date"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates a specific safety modification for certain **Aerospatiale Rallye MS880 series aircraft**.\n\n**What it does:**\n- Requires owners/operators of affected aircraft to modify the **engine cooling system** to prevent overheating risks.\n- The modification must be done according to either:\n  - **Rallye Service Bulletin No. 30** (manufacturer's technical instruction), OR\n  - **Bureau Veritas Airworthiness Specification 64-8-8** (French aviation authority approval).\n\n**Who it affects:**\n- Owners and operators of specific Rallye MS880 aircraft with serial numbers: 5001–5330, 5336–5345, and 5377.\n\n**Why it matters:**\n- Engine cooling failures can cause catastrophic in-flight engine failure. This AD is a mandatory safety fix—aircraft cannot legally fly until compliance is achieved. The \"Forthwith\" compliance deadline means **immediate action required** with no grace period.\n\n**Key terms explained:**\n- **Airworthiness Directive (AD):** A legally enforceable safety order requiring aircraft modifications, inspections, or repairs.\n- **Service Bulletin (SB):** Technical instructions issued by aircraft manufacturers to address safety or reliability issues.\n- **Forthwith:** Immediately; without delay."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD sets a targeted scope: it applies only to specified MS880-series serial numbers and requires a specified modification to the engine cooling system, to be carried out according to one of two named technical documents (Applicability; Document). The text does not indicate any change from a prior broader or narrower intent within this document; it states the covered aircraft and the required action without altering that stated scope."},"complexity_factors":["Narrow and specific applicability (only certain serial numbers are covered) (Applicability)","Immediate compliance requirement reduces scheduling flexibility and increases urgency (Compliance: Forthwith)","Reliance on external technical documents (Rallye SB No. 30 or Bureau Veritas Spec 64-8-8) rather than including technical steps in the AD (Document)","Shortness of the AD text: technical content and potential implementation detail are absent from the AD itself, requiring operators to obtain and interpret separate documents (Document)","Regulatory enforcement under Part 39 creates a clear compliance framework but leaves operational detail to maintenance providers and the referenced specifications (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39)"],"plain_english_summary":"This AD mandates an immediate engine‑cooling modification for Aerospatiale Rallye MS880 aircraft with serial numbers 5001–5330, 5336–5345, and 5377. Owners/operators must carry out the work forthwith using Rallye Service Bulletin No. 30 or Bureau Veritas Airworthiness Specification 64‑8‑8, bear all costs, and accept downtime. It matters because compliance is mandatory and urgent, and proof depends on obtaining and following the referenced technical documents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-msr-8-engine-cooling-modification","history":"/api/acts/ad-msr-8-engine-cooling-modification/history","analysis":"/api/acts/ad-msr-8-engine-cooling-modification/analysis","conflicts":"/api/acts/ad-msr-8-engine-cooling-modification/conflicts","importantCases":"/api/acts/ad-msr-8-engine-cooling-modification/important-cases","documents":"/api/acts/ad-msr-8-engine-cooling-modification/documents"}}