{"id":"F2006B10412","name":"AD/HS 125/132 - Warming Oven Part Number 206B-LH-28/115","slug":"ad-hs-125-132-warming-oven-part-number-206b-lh-28-115","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116087,"registerId":"commonwealth-F2006B10412-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/132 - Warming Oven Part Number 206B-LH-28/115","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 BAe 125 Series Aeroplanes\n\n \n\nAD/HS 125/132 Warming Oven Part Number 206B-LH-28/115 13/92\n\nApplicability: All series 125 aircraft fitted with Aircraft Products Company Warming Oven part number 206B-LH-28/115.\n\nRequirement: Action IAW CAA (UK) mandatory BAe SB 25-64-9758C dated 10 August 1992. Compliance:               As specified in the Requirement Document with a revised compliance date of\n\n31 December 1993 for Australian registered aircraft.\n\n \n\nBackground: This Directive requires that the warming oven be modified to provide additional overheat protection following instances of thermal runaway.\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":3,"scope_assessment":{"changed":false,"description":"The directive does not change the set of aircraft to which it applies; it reiterates the applicability to BAe 125 series aircraft fitted with warming oven part number 206B-LH-28/115 (Applicability). The only explicit change stated in the text is a revised compliance date for Australian-registered aircraft (Compliance), which alters timing but not the substantive scope of affected aircraft or the required modification."},"complexity_factors":["Narrow applicability limited to BAe 125 series aircraft fitted with a single specific part number (Applicability)","Mandates a single corrective action but does so by referencing an external mandatory CAA (UK) service bulletin rather than reproducing technical steps (Requirement)","Includes a revised compliance date for Australian-registered aircraft, adding a scheduling constraint (Compliance)","Authority and enforcement implied by publication in the Civil Aviation Safety Authority schedule but the directive does not specify enforcement mechanisms, penalties, or alternatives (header, Requirement)","Limited technical ambiguity in the directive itself because it delegates detailed procedure to the external service bulletin (Requirement)"],"plain_english_summary":"### What this directive does\n\n- This is an airworthiness directive issued under the Commonwealth Civil Aviation framework (see header). It applies to British Aerospace BAe 125 series aeroplanes that have an Aircraft Products Company warming oven with part number 206B-LH-28/115 (\"Applicability\").\n\n- The directive requires operators to carry out the modification set out in the United Kingdom CAA mandatory BAe Service Bulletin 25-64-9758C dated 10 August 1992 (\"Requirement\"). Australian-registered aircraft must comply by 31 December 1993, per the revised compliance date in this directive (\"Compliance\").\n\n- The stated reason for the required modification is to add extra overheat protection after occurrences of thermal runaway in the warming oven (\"Background\").\n\n### Who is affected and who decides\n\n- Affected parties: owners/operators of any BAe 125 series aeroplane that is fitted with the specific warming oven part number 206B-LH-28/115 (cited under \"Applicability\").\n\n- Decision and instruction source: the Directive references and mandates compliance with the CAA (UK) service bulletin and is published via the Civil Aviation Safety Authority schedule of airworthiness directives (header). The directive sets the compliance date for Australian-registered aircraft (\"Compliance\").\n\n### What operators must do, and who pays\n\n- Required action: perform the modification described in BAe SB 25-64-9758C (\"Requirement\"). The directive does not itself describe the technical steps; it directs operators to the service bulletin for the specific work scope.\n\n- Who pays: the directive does not state funding arrangements. By naming owners/operators in the applicability and prescribing a mandated modification and compliance date, it places the obligation to obtain and carry out the modification on the operator of the affected aircraft (see \"Applicability\" and \"Requirement\").\n\n### Practical effects, compliance burden and implementation points\n\n- Compliance burden: operators must obtain the referenced service bulletin and implement the modification by the stated date. That will typically require parts, labour and maintenance scheduling, and may require aircraft downtime; the directive itself specifies only that the modification be done as per the Requirements document and by the revised date (\"Requirement\", \"Compliance\").\n\n- Bureaucratic discretion and enforcement: the directive sets the required action and a compliance deadline; enforcement and regulatory effect flow from its publication in the Civil Aviation Safety Authority schedule of airworthiness directives (header). The directive does not detail penalties, exemptions or alternative means of compliance.\n\n- Trade-offs and opportunity costs: complying requires operators to allocate maintenance resources and incur costs for parts and labour by the compliance date. The directive does not quantify costs, allow alternatives, or provide funding assistance (see \"Requirement\" and \"Compliance\").\n\n- Technical scope: the rule is narrowly targeted to a specific part number installed on BAe 125 series aircraft and to a single safety measure (additional overheat protection) as set out in the referenced service bulletin (\"Applicability\", \"Background\").\n\n### Source statements and analyst note\n\n- The directive’s stated purpose is to prevent thermal runaway by adding overheat protection (\"Background\"). That purpose is implemented mechanically by mandating the BAe service bulletin modification and setting a compliance date for Australian-registered aircraft (\"Requirement\", \"Compliance\").\n\n- The directive shifts a concrete, time-bound compliance obligation onto operators of affected aircraft; it does not itself provide cost, exemption, or alternative-compliance detail. The primary discretion left is procedural: how the operator implements the service bulletin work and schedules it before the compliance date."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft component. It has not expanded beyond its original purpose of mandating a safety modification to prevent thermal runaway in warming ovens."},"complexity_factors":["Single, specific technical requirement referencing an external document (CAA UK Service Bulletin)","Only one defined applicability criterion (specific aircraft series + specific part number)","Simple two-part structure: applicability and requirement","No nested exceptions, conditional logic, or cross-references to other legislation","Very short document (approximately 150 words of substantive content)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of specific British Aerospace BAe 125 series aircraft to modify a particular kitchen warming oven (part number 206B-LH-28/115) to add extra protection against overheating.\n\n**Who it affects:**\nAnyone who owns or operates a BAe 125 series aircraft in Australia that has this specific warming oven installed.\n\n**Why it matters:**\nThe warming oven has a dangerous fault where it can suffer \"thermal runaway\" — essentially, it can overheat uncontrollably and potentially cause fire or damage. This directive mandates a fix (detailed in a British technical bulletin) to prevent that risk. Australian-registered aircraft must complete the modification by **31 December 1993**."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-132-warming-oven-part-number-206b-lh-28-115","history":"/api/acts/ad-hs-125-132-warming-oven-part-number-206b-lh-28-115/history","analysis":"/api/acts/ad-hs-125-132-warming-oven-part-number-206b-lh-28-115/analysis","conflicts":"/api/acts/ad-hs-125-132-warming-oven-part-number-206b-lh-28-115/conflicts","importantCases":"/api/acts/ad-hs-125-132-warming-oven-part-number-206b-lh-28-115/important-cases","documents":"/api/acts/ad-hs-125-132-warming-oven-part-number-206b-lh-28-115/documents"}}