{"id":"F2006B10381","name":"AD/HS 125/103 - Rear Pressure Bulkhead/Airconditioning Duct","slug":"ad-hs-125-103-rear-pressure-bulkhead-airconditioning-duct","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116027,"registerId":"commonwealth-F2006B10381-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/103 - Rear Pressure Bulkhead/Airconditioning Duct","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 125/103 Rear Pressure Bulkhead/Airconditioning Duct 2/90\n\nDM\n\nThis AD contents has been removed from the listing because the aircraft model is not currently on the register.\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":2,"scope_assessment":{"changed":true,"description":"The entry shows a change in the published scope: the AD (AD/HS 125/103) that concerned the BAe 125 rear pressure bulkhead/airconditioning duct has been removed from CASA’s schedule because the aircraft model is not currently on the register. The supplied text does not include the original AD obligations, so the recorded change is limited to removal from the public listing rather than providing details of any substantive amendment to technical requirements."},"complexity_factors":["Document is a brief administrative record with no operative requirements included.","Removal hinges on a single, explicit factual condition (registry status) rather than multi-step procedures.","Absence of technical, procedural, or cost details that would add implementation complexity.","Cross-reference to broader regulatory framework (Civil Aviation Regulations Part 39) without embedding those provisions increases reliance on external documents for full meaning."],"plain_english_summary":"What this entry is: This document is a schedule entry from the Civil Aviation Safety Authority (CASA) listing an Airworthiness Directive (AD) identified as AD/HS 125/103, titled “Rear Pressure Bulkhead/Airconditioning Duct,” which applied to British Aerospace BAe 125 series aeroplanes. The entry is part of the CASA Schedule of Airworthiness Directives under the Commonwealth of Australia (Civil Aviation Regulations 1998), PART 39 - 105.\n\nWhat changed mechanically: The listing entry for AD/HS 125/103 has been removed from CASA’s published schedule. The removal is recorded with the explicit reason given in the entry: \"This AD contents has been removed from the listing because the aircraft model is not currently on the register.\" (see AD/HS 125/103 and the removal note).\n\nWho this affects and who decides: The document names CASA as the responsible regulator (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY). The AD, while listed, would have targeted operators/owners of BAe 125 series aeroplanes; the record now states the model is not on the register, and CASA has removed the AD from its published listing. The entry itself does not set out operational or technical requirements, nor does it allocate costs or specify enforcement steps.\n\nWhy it matters (mechanics, incentives, and trade-offs):\n- The entry records an administrative change: removal from the public schedule because the relevant aircraft type is not on the national register (source: the removal note in the entry). That removal changes the publicly visible regulatory status of this specific AD within CASA’s schedule. (AD/HS 125/103; removal note.)\n- The item does not include the text of the AD, required actions, timetables, or cost estimates. Therefore the document does not specify compliance obligations, who would pay for inspections or repairs, or the precise behavioural changes that the AD would have required. Any such obligations are not present in the supplied text. (See the absence of operative AD content in the entry.)\n- Administrative discretion and trigger: the recorded trigger for removal is registry status (the aircraft model “not currently on the register”). This creates a clear, source-stated condition that governs the listing’s presence. If the registry status changes, the listing could be reinstated or otherwise updated; the entry does not describe that process or thresholds for reinstatement. (Removal note.)\n\nPractical points and limits of the entry:\n- The entry identifies the subject (rear pressure bulkhead / airconditioning duct) and the affected model (BAe 125 series) but contains no technical requirements, compliance schedule, or enforcement language. The public record here is limited to an administrative note removing the AD from the published schedule. (AD title and removal note.)\n- Because the AD text and any associated compliance/cost details are not included, this record does not allow a complete assessment of costs, incentives, or operational impacts on owners, maintenance providers, insurers, or passengers. Any further analysis would require the original AD text or CASA guidance referenced by the AD.\n\nSource citations: AD identifier and title (AD/HS 125/103 — Rear Pressure Bulkhead/Airconditioning Duct); regulator and statutory context (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY); removal statement (\"This AD contents has been removed from the listing because the aircraft model is not currently on the register.\")."},"kimi_summary":{"content_quality":"rejected","complexity_score":1,"rejection_reason":"This is a navigation stub or placeholder page indicating an Airworthiness Directive has been removed from the register. It contains no substantive legislative content — only metadata stating the AD is no longer active because the aircraft type is unregistered. No operative provisions, requirements, or legal text to analyse.","scope_assessment":{"changed":false,"description":"Not applicable — this is a withdrawn directive with no active content to assess."},"complexity_factors":["Document is a stub/placeholder with no operative text remaining","Only contains metadata (document type, aircraft model, removal notice)","No substantive provisions, definitions, or procedural requirements present","Single sentence of explanatory content"],"plain_english_summary":"This document is an **Airworthiness Directive (AD)** — essentially a safety order issued by Australia's Civil Aviation Safety Authority (CASA) telling aircraft owners and operators they must fix a specific problem.\n\n**What it covers:** British Aerospace BAe 125 series business jets, specifically an issue with the **rear pressure bulkhead** (the wall at the back of the passenger cabin that keeps the cabin pressurised during flight) and the **air conditioning duct** that runs through it.\n\n**Current status:** The directive has been **removed from active use** because no BAe 125 aircraft are currently registered in Australia. Think of it like a product recall that gets archived when nobody owns the product anymore.\n\n**Why it matters:** Airworthiness Directives are legally binding safety instructions. When active, ignoring one means you can't fly the aircraft legally. This particular AD dates from 1990 (the \"2/90\" indicates February 1990) and would have required inspections or repairs to prevent potential failures that could cause rapid decompression or loss of cabin pressure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-103-rear-pressure-bulkhead-airconditioning-duct","history":"/api/acts/ad-hs-125-103-rear-pressure-bulkhead-airconditioning-duct/history","analysis":"/api/acts/ad-hs-125-103-rear-pressure-bulkhead-airconditioning-duct/analysis","conflicts":"/api/acts/ad-hs-125-103-rear-pressure-bulkhead-airconditioning-duct/conflicts","importantCases":"/api/acts/ad-hs-125-103-rear-pressure-bulkhead-airconditioning-duct/important-cases","documents":"/api/acts/ad-hs-125-103-rear-pressure-bulkhead-airconditioning-duct/documents"}}