{"id":"F2006B03456","name":"AD/BAe 146/102 - Air-conditioning Duct - Inspection","slug":"ad-bae-146-102-air-conditioning-duct-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43010,"registerId":"commonwealth-F2006B03456-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nBritish Aerospace BAe 146 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BAe 146/102 Air-conditioning Duct - I","sectionType":"part","heading":"AD/BAe 146/102 Air-conditioning Duct - Inspection 1/2003","content":"# AD/BAe 146/102 Air-conditioning Duct \\- Inspection 1/2003\n\nApplicability: All BAe 146 \\-100, 200 and 300 Series aircraft.\n\nRequirement: Action per the requirements of BAE Systems Inspection Service Bulletin (ISB.) 21- 156.\n\nNote: CAA(UK) has classified the requirements of BAE Systems ISB. 21-156 as Mandatory.\n\nCompliance: Carry out initial inspection and repetitive inspections as detailed in the BAE Systems ISB. 21-156 with a revised effective date of 23 January 2003.\n\nThis Airworthiness Directive becomes effective on 23 January 2003.\n\nBackground: It is found that the sound attenuating material used in the air-conditioning ducts can absorb oil and can become a source of persistent air contamination. This Directive mandates scheduled repetitive inspections and additional inspections when cabin air contamination is persistent.\n\n![Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 28 November 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 18 December 2002.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive implements its stated intent: to require inspections of air‑conditioning ducts per BAE Systems ISB 21-156 to address oil absorption and potential cabin air contamination. Applicability, required actions and the effective date are consistent with that objective and do not expand or narrow the subject matter beyond the inspection mandate set out in the AD (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Broad applicability to an entire aircraft family (All BAe 146 -100, -200 and -300 series) — (Applicability).","Requirement depends on an external technical document (BAE Systems ISB 21-156), so legal effect hinges on that ISB's instructions and revision date — (Requirement; Compliance).","Mandated schedule includes both initial and repetitive inspections, plus additional inspections when contamination is persistent, increasing operational planning and recurring costs for operators — (Requirement; Background).","Compliance timing is fixed (effective 23 January 2003), creating immediate implementation obligations from that date — (Compliance).","Regulatory endorsement by another authority noted (CAA(UK) classified ISB 21-156 as Mandatory), which may affect interpretation and enforcement expectations — (Note).","Decision authority is a CASA delegate issuing the AD; operators must follow the delegate's mandated corrective actions rather than choosing alternative mitigations — (preamble/signature and Requirement)."],"plain_english_summary":"This Airworthiness Directive requires operators of all BAe 146 -100/200/300 series aircraft to carry out initial and repetitive inspections of the air‑conditioning ducts in accordance with BAE Systems Inspection Service Bulletin `ISB 21-156` (revised effective date 23 January 2003). CASA issued it because the sound‑attenuating material in those ducts can absorb oil and cause persistent cabin air contamination; extra inspections are mandated when contamination persists."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a tightly focused scope: addressing a specific mechanical defect in a specific aircraft type. The scope matches the original intent of ensuring aviation safety for this particular issue."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (the ISB bulletin)","No nested conditional logic or cross-references to other legislation","Single clear applicability criterion (specific aircraft series)","Single compliance pathway (follow the manufacturer's bulletin)","No exceptions or exemptions mentioned"],"plain_english_summary":"This CASA safety order requires operators of British Aerospace BAe 146 (-100/-200/-300) aircraft in Australia to inspect air‑conditioning ducts per BAE Systems ISB 21‑156 because oil‑soaked insulation can cause persistent cabin air contamination. It affects anyone operating these models in Australia and came into effect on 23 January 2003, mandating initial and ongoing inspections to protect crew and passenger health and safety."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-102-air-conditioning-duct-inspection","history":"/api/acts/ad-bae-146-102-air-conditioning-duct-inspection/history","analysis":"/api/acts/ad-bae-146-102-air-conditioning-duct-inspection/analysis","conflicts":"/api/acts/ad-bae-146-102-air-conditioning-duct-inspection/conflicts","importantCases":"/api/acts/ad-bae-146-102-air-conditioning-duct-inspection/important-cases","documents":"/api/acts/ad-bae-146-102-air-conditioning-duct-inspection/documents"}}