{"id":"F2006B11311","name":"AD/MSR/11 Amdt 1 - Flexible Hoses in Engine Compartment - Installation","slug":"ad-msr-11-amdt-1-flexible-hoses-in-engine-compartment-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57158,"registerId":"commonwealth-F2006B11311-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MSR/11 Amdt 1 - Flexible Hoses in Engine Compartment - Installation","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nAerospatiale Rallye Series Aeroplanes\n\nAD/MSR/11\n\nAmdt 1\n\n  \n\nFlexible Hoses in Engine Compartment \\- Installation\n\n  \n2/73\n\nApplicability: Models MS880B, MS885, MS892A, MS893A, MS894A.\n\nRequirement: Modify the fuel system by installing flexible fuel lines between the engine driven pump and the carburettor and in the fuel pressure indicator line, in accordance with Rallye SB No. 56 Part 2 and 3.\n\nNote 1: For those aircraft already modified in accordance with AD/MSR/7, further modification of the fuel pressure indicator line is not required.\n\nNote 2: Do not use parts of the original copper fuel line as adapters since these are liable to fatigue failure.\n\nCompliance: Within 100 hours time in service after 30 March 1973 unless already accomplished.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is an amendment (Amdt 1) to an existing Airworthiness Directive, but the scope remains tightly focused on the original safety issue: preventing fuel line failures in specific Rallye aircraft models. The amendment appears to refine or update the original AD/MSR/11 without expanding beyond the fuel system modification requirement."},"complexity_factors":["Very short document (approximately 150 words)","Only 5 specific aircraft models affected","Single mechanical modification with clear technical reference (Rallye SB No. 56 Parts 2 and 3)","Two simple conditional exemptions (Note 1 and Note 2)","No defined terms section","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Clear compliance deadline with straightforward alternative ('unless already accomplished')"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific repairs or modifications to aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Aerospatiale Rallye series aeroplanes** (specifically models MS880B, MS885, MS892A, MS893A, and MS894A) to modify their fuel systems. The modification involves installing **flexible fuel hoses** in two places:\n- Between the engine-driven fuel pump and the carburettor (the device that mixes fuel and air)\n- In the fuel pressure indicator line\n\n**Why it matters:**\nRigid copper fuel lines in the engine compartment can crack from vibration and fatigue, creating fire hazards. Flexible hoses absorb vibration better and are less likely to fail catastrophically.\n\n**Key exemptions and warnings:**\n- **Already fixed?** Aircraft previously modified under an earlier directive (AD/MSR/7) only need the carburettor line done — the pressure indicator line can stay as-is.\n- **Don't reuse old parts:** The original copper fuel lines must NOT be repurposed as adapters, as they're prone to metal fatigue and could break.\n\n**Deadline:**\nThe work must be completed within **100 hours of flight time** after 30 March 1973, unless already done.\n\n**Who must comply:**\nAnyone operating or maintaining these specific Rallye aircraft models in Australia."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument is labelled as Amendment 1 to AD/MSR/11, and it sets out a specific installation requirement for flexible fuel hoses between the engine-driven pump and carburettor and in the fuel pressure indicator line, together with compliance timing and two notes that limit reuse of original copper parts and exempt aircraft modified under AD/MSR/7 (Requirement; Note 1; Note 2; Compliance). The amendment therefore alters the original directive package by imposing these explicit installation and parts-use requirements and by tying compliance to specified service bulletin procedures."},"complexity_factors":["Narrow applicability limited to five Aerospatiale Rallye models (Applicability).","Mandated action depends on an external technical document: Rallye Service Bulletin No. 56 Parts 2 and 3 (Requirement).","Temporal compliance deadline tied to aircraft hours in service (100 hours after 30 March 1973) (Compliance).","Exception linkage to a prior airworthiness directive (AD/MSR/7) for partial exemption (Note 1).","A specific material prohibition (do not reuse original copper fuel line parts) that affects parts sourcing and installation technique (Note 2)."],"plain_english_summary":"This airworthiness directive requires owners/operators of Aerospatiale Rallye MS880B, MS885, MS892A, MS893A and MS894A to fit flexible fuel hoses between the engine-driven pump and carburettor and in the fuel pressure indicator line, to eliminate fatigue-prone copper adapters. Work must follow Rallye Service Bulletin No.56 Parts 2 & 3 and be completed within 100 hours TIS after 30 Mar 1973 (except aircraft already modified under AD/MSR/7); costs are parts and labour."}},"importantCases":[],"_links":{"self":"/api/acts/ad-msr-11-amdt-1-flexible-hoses-in-engine-compartment-installation","history":"/api/acts/ad-msr-11-amdt-1-flexible-hoses-in-engine-compartment-installation/history","analysis":"/api/acts/ad-msr-11-amdt-1-flexible-hoses-in-engine-compartment-installation/analysis","conflicts":"/api/acts/ad-msr-11-amdt-1-flexible-hoses-in-engine-compartment-installation/conflicts","importantCases":"/api/acts/ad-msr-11-amdt-1-flexible-hoses-in-engine-compartment-installation/important-cases","documents":"/api/acts/ad-msr-11-amdt-1-flexible-hoses-in-engine-compartment-installation/documents"}}