{"id":"F2006B06767","name":"AD/SA-TP/19 - Heat Exchange Unit Intensifier Tube","slug":"ad-sa-tp-19-heat-exchange-unit-intensifier-tube","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114601,"registerId":"commonwealth-F2006B06767-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SA-TP/19 - Heat Exchange Unit Intensifier Tube","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)  British Aerospace (Scottish Aviation) Twin Pioneer Series Aeroplanes\n\n \n\nAD/SA-TP/19 Heat Exchange Unit Intensifier Tube NK\n\nApplicability: All series 1 and 3.\n\n \n\nDocument: Scottish Aviation TNS No. 26. 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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This AD imposes a new, immediate compliance obligation on owners/operators of Twin Pioneer Series 1 and 3 aircraft to follow Scottish Aviation TNS No. 26 with respect to the heat exchange unit intensifier tube. The supplied text replaces the prior status‑quo by mandating adherence to the referenced technical note forthwith for the identified fleet. The AD text itself does not record prior requirements, so the change is that a mandatory, immediate action is now imposed for the stated applicability (see: “Applicability: All series 1 and 3.”; “Document: Scottish Aviation TNS No. 26.”; “Compliance: Forthwith.”)."},"complexity_factors":["Narrow applicability (only Twin Pioneer Series 1 and 3) reduces scope complexity.","Immediate compliance requirement (‘Forthwith’) raises operational and scheduling complexity for operators.","Directive relies on an external technical document (Scottish Aviation TNS No. 26) for procedural detail; the AD text itself lacks work‑step detail.","Lack of stated rationale or description of the defect within the AD text increases interpretive uncertainty for stakeholders.","No enforcement, exemption, or follow‑up schedule is specified in the supplied text, increasing need to consult additional materials."],"plain_english_summary":"This AD mandates that owners and operators of British Aerospace (Scottish Aviation) Twin Pioneer Series 1 and 3 aircraft immediately comply with the procedures in Scottish Aviation TNS No. 26 regarding the Heat Exchange Unit Intensifier Tube.  \n\nIt affects operators, maintenance organisations and engineers, who must obtain and follow the external TNS forthwith; costs, downtime and scheduling are borne by operators since the AD relies on that referenced document for technical details."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive for a specific aircraft component. It represents the standard, narrow scope of an individual Airworthiness Directive and has not expanded beyond its original purpose of addressing a specific unsafe condition in the Twin Pioneer aircraft's heat exchange system."},"complexity_factors":["Extremely short document (under 200 words)","No defined terms section — relies on external technical reference (Scottish Aviation TNS No. 26)","No conditional logic or nested exceptions","Single, unambiguous compliance requirement ('Forthwith')","Minimal cross-referencing (only to external manufacturer document)","Straightforward applicability clause ('All series 1 and 3')"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft: the **British Aerospace (Scottish Aviation) Twin Pioneer Series 1 and 3 aeroplanes**.\n\n**What it does:**\n- Requires owners and operators of these aircraft to take immediate action regarding the **\"Heat Exchange Unit Intensifier Tube\"** — a component in the aircraft's heating or environmental control system.\n- The directive references **Scottish Aviation Technical Note Service (TNS) No. 26**, which contains the specific technical instructions for what must be done.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains a British Aerospace Twin Pioneer Series 1 or 3 aircraft in Australia.\n\n**Why it matters:**\n- Airworthiness Directives are legally binding safety orders. They are issued when CASA determines that an unsafe condition exists in an aircraft, engine, or propeller. Compliance is mandatory — you cannot legally fly the aircraft until you follow the directive.\n- The word **\"Forthwith\"** means immediately, without delay. This suggests the safety issue is serious enough that it cannot wait until the next scheduled maintenance.\n\n**In short:** If you fly one of these specific Twin Pioneer aircraft, you must immediately check and address a problem with a heating system component according to the manufacturer's technical instructions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sa-tp-19-heat-exchange-unit-intensifier-tube","history":"/api/acts/ad-sa-tp-19-heat-exchange-unit-intensifier-tube/history","analysis":"/api/acts/ad-sa-tp-19-heat-exchange-unit-intensifier-tube/analysis","conflicts":"/api/acts/ad-sa-tp-19-heat-exchange-unit-intensifier-tube/conflicts","importantCases":"/api/acts/ad-sa-tp-19-heat-exchange-unit-intensifier-tube/important-cases","documents":"/api/acts/ad-sa-tp-19-heat-exchange-unit-intensifier-tube/documents"}}