{"id":"F2006B08729","name":"AD/DAUPHIN/18 - Engine Fuel Tube Interference","slug":"ad-dauphin-18-engine-fuel-tube-interference","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51958,"registerId":"commonwealth-F2006B08729-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DAUPHIN/18 - Engine Fuel Tube Interference","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)  \nEurocopter SA 360 and SA 365 (Dauphin) Series Helicopters\n\nAD/DAUPHIN/18 Engine Fuel Tube Interference 4/87\n\nTX\n\nApplicability: SA 365C, C1, C2, C3 and N models.\n\nRequirement: 1. Inspect engine fuel pipe P/N 0301037030 for interference with fuel control sheath in accordance with Bureau Veritas AD 87-008-028(B).\n\n2. Install protective spiral sheath P/N 84904T075 or equivalent in accordance with Bureau Veritas AD 87-008-028(B).\n\nCompliance: 1. Unless already accomplished, prior to further flight.\n\n2. Within 50 hours time in service after 16 February 1987.\n\nBackground: This Directive has been issued to require inspection and protection of an engine fuel pipe. The manufacturer recently advised of a fuel leak event which resulted from interference between the fuel pipe and the fuel control sheath.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive implements the single stated purpose in the Background—inspect the specified engine fuel pipe and fit a protective sheath to prevent interference with the fuel control sheath—without expanding applicability beyond the listed SA 365 models or adding unrelated requirements. The instrument confines action to the named part numbers, follows an external Bureau Veritas procedure, and specifies short compliance windows; it does not change or broaden the technical scope from the stated intent."},"complexity_factors":["Narrow applicability to specific helicopter models reduces scope complexity (Applicability).","High technical specificity: references exact part numbers for the pipe (P/N 0301037030) and the protective sheath (P/N 84904T075). (Requirement 1 & 2)","Dependency on an external technical procedure (Bureau Veritas AD 87-008-028(B)) increases procedural complexity and creates a single-point procedural dependency. (Requirement 1 & 2)","Two-tier timing requirements (immediate inspection prior to further flight; sheath installation within 50 hours TIS after a specified date) create scheduling constraints. (Compliance 1 & 2)","Allowance for an \"equivalent\" part introduces technical judgement and recordkeeping needs for equivalence. (Requirement 2)","Operational impact risk from a prior-to-flight mandate: potential for immediate grounding until inspection is done. (Compliance 1)"],"plain_english_summary":"This directive requires owners/operators of Eurocopter (Airbus) SA 365C/C1/C2/C3/N helicopters to inspect a specific engine fuel pipe (P/N 0301037030) for interference and, if needed, fit a protective spiral sheath (P/N 84904T075 or equivalent) per Bureau Veritas AD 87-008-028(B). \n\nIt must be inspected before further flight and the sheath fitted within 50 flight hours; operators bear costs. The measure prevents a manufacturer‑reported fuel‑leak risk from pipe/sheath interference."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused specifically on a known mechanical defect in particular helicopter models. It has not expanded beyond its original purpose of addressing fuel tube interference."},"complexity_factors":["Very short document (under 200 words)","Only 2 substantive requirements with clear deadlines","Single applicability criterion (specific aircraft models)","No defined terms section — uses plain technical language","No cross-references to other legislation (only references Bureau Veritas AD for technical procedure)","Simple conditional logic ('unless already accomplished')","No nested exceptions or complex compliance pathways"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific helicopter models.\n\n**What it does:**\nOrders owners and operators of certain Eurocopter Dauphin helicopters to fix a dangerous fuel leak problem. The fuel pipe can rub against (interfere with) a protective sheath, causing wear that leads to fuel leaks.\n\n**Who it affects:**\n- **Aircraft:** Eurocopter SA 365C, C1, C2, C3, and N model helicopters\n- **People:** Owners, operators, and maintenance engineers responsible for these aircraft\n\n**What must be done:**\n1. **Immediate inspection:** Check engine fuel pipe part number 0301037030 for rubbing damage — must be done before the helicopter flies again (unless already checked)\n2. **Install protection:** Fit a protective spiral sheath (part number 84904T075 or equivalent) within 50 flight hours after 16 February 1987\n\n**Why it matters:**\nFuel leaks in helicopters create fire and explosion risks. This directive was triggered after the manufacturer reported an actual fuel leak caused by this interference problem. Compliance is legally mandatory — flying without fixing this violates civil aviation safety regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dauphin-18-engine-fuel-tube-interference","history":"/api/acts/ad-dauphin-18-engine-fuel-tube-interference/history","analysis":"/api/acts/ad-dauphin-18-engine-fuel-tube-interference/analysis","conflicts":"/api/acts/ad-dauphin-18-engine-fuel-tube-interference/conflicts","importantCases":"/api/acts/ad-dauphin-18-engine-fuel-tube-interference/important-cases","documents":"/api/acts/ad-dauphin-18-engine-fuel-tube-interference/documents"}}