{"id":"F2006B09300","name":"AD/DO-27/5 - Fuel, Oil and Manifold Pressure Flexible Hoses - Replacement","slug":"ad-do-27-5-fuel-oil-and-manifold-pressure-flexible-hoses-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53387,"registerId":"commonwealth-F2006B09300-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DO-27/5 - Fuel, Oil and Manifold Pressure Flexible Hoses - Replacement","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)  Dornier DO-27 Series Aeroplanes\n\n \n\nAD/DO-27/5 Fuel, Oil and Manifold Pressure Flexible Hoses - Replacement\n\nApplicability: All model DO-27, A-4, Q-5 and Q-6. Document:  Dornier TB No. 27-27.\n\nCompliance: Before 1 September 1971.\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\n\n6/65\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive text is narrow and prescriptive: it requires replacement of fuel, oil and manifold pressure flexible hoses on the listed DO-27 models and specifies a compliance deadline, referencing Dornier TB No. 27-27 for technical details. There is no indication in the provided text that the scope has been expanded or narrowed from an earlier or different stated intent; the instrument itself defines the affected models, the technical reference and the deadline."},"complexity_factors":["Narrow, clearly specified scope limited to particular aircraft models (Applicability).","Clear, single compliance deadline (Compliance: Before 1 September 1971).","Technical details and acceptable methods are delegated to an external document (Dornier TB No. 27-27), which requires operators to consult that bulletin (Document).","The directive text does not include enforcement, exemption, or alternative-compliance procedures, increasing reliance on regulator practice and the technical bulletin for implementation.","Operational complexity depends on logistical issues (parts availability, maintenance scheduling) not detailed in the directive itself."],"plain_english_summary":"This directive mandates replacement of fuel, oil and manifold‑pressure flexible hoses on Dornier DO‑27 series (DO‑27, A‑4, Q‑5, Q‑6), to be carried out per Dornier TB No. 27‑27 and completed by 1 September 1971. It affects owners, operators and maintenance organisations, imposing safety‑driven work, parts and downtime costs while relying on the manufacturer bulletin for technical detail."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on hose replacement for one aircraft series. It has not expanded beyond its original narrow safety purpose. The document appears complete as issued in 1965."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory content","No defined terms section","No cross-references to other legislation beyond the enabling Civil Aviation Regulations","Simple unconditional mandate: replace hoses by a fixed date","Single applicability criterion (aircraft model) with no exceptions or nested conditions","No procedural requirements, appeal mechanisms, or penalty provisions included"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for specific Dornier aircraft models.\n\n**What it does:**\n- Requires owners and operators of certain Dornier DO-27 series aeroplanes (including models A-4, Q-5, and Q-6) to **replace flexible hoses** used for fuel, oil, and manifold pressure systems.\n\n**Who it affects:**\n- Anyone who owns or operates the affected Dornier aircraft models.\n\n**Why it matters:**\n- Flexible hoses in aircraft fuel and oil systems can degrade over time, potentially leading to leaks, engine failure, or fire. This directive mandates replacement to prevent catastrophic failures.\n\n**Key details:**\n- **Compliance deadline:** Before 1 September 1971 (this is a historical directive — long past its compliance date)\n- **Technical basis:** Dornier Technical Bulletin No. 27-27\n- **Identifier:** AD/DO-27/5 (the 5th AD issued for the DO-27 series)\n\nThis document appears to be a **historical aviation safety record** from 1965 (indicated by \"6/65\" at the bottom), predating modern CASA and reflecting the regulatory framework under the old Civil Aviation Regulations 1988."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-27-5-fuel-oil-and-manifold-pressure-flexible-hoses-replacement","history":"/api/acts/ad-do-27-5-fuel-oil-and-manifold-pressure-flexible-hoses-replacement/history","analysis":"/api/acts/ad-do-27-5-fuel-oil-and-manifold-pressure-flexible-hoses-replacement/analysis","conflicts":"/api/acts/ad-do-27-5-fuel-oil-and-manifold-pressure-flexible-hoses-replacement/conflicts","importantCases":"/api/acts/ad-do-27-5-fuel-oil-and-manifold-pressure-flexible-hoses-replacement/important-cases","documents":"/api/acts/ad-do-27-5-fuel-oil-and-manifold-pressure-flexible-hoses-replacement/documents"}}