{"id":"F2006B03346","name":"AD/B767/171 - Flight Compartment Air Distribution Duct","slug":"ad-b767-171-flight-compartment-air-distribution-duct","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42783,"registerId":"commonwealth-F2006B03346-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\nBoeing 767 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B767/171 Flight Compartment Air Distr","sectionType":"part","heading":"AD/B767/171 Flight Compartment Air Distribution Duct 7/2002","content":"# AD/B767/171 Flight Compartment Air Distribution Duct 7/2002\n\nApplicability: All model 767 series aircraft having the line numbers listed in the requirement document.\n\nRequirement: 1. Inspect, rework or replace if necessary the water line heater tape and the duct assemblies of the flight compartment air distribution system in accordance with paragraph (a) of the technical requirements of FAA AD 2001-26-09 Amdt 39- 12573.\n\n2. Replace the duct assemblies or replace the existing BMS 8-39 foam insulation on the ducts of the air distribution system for the flight compartment in accordance with paragraph (b) of the technical requirements of FAA AD 2001-26-09 Amdt 39-12573.\n\nNote: Boeing Alert Service Bulletin 767-21A0154 Revision 1 dated 9 August 2001 refers.\n\nCompliance: 1. Before 11 January 2004.\n\n2. Before 11 July 2008.\n\nThis Airworthiness Directive becomes effective on 11 July 2002.\n\nBackground: The FAA AD has been raised to prevent ignition of foam insulation on the air distribution ducts, which could result in a fire in the aircraft.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 27 May 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 19 June 2002.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope is limited to the Boeing 767 line numbers specified in the referenced requirement document and to the actions (inspect/rework/replace ducts and insulation) stated. The instrument adopts the FAA AD's technical requirements and Boeing's service bulletin by reference; there is no text indicating an expansion or narrowing of scope from those referenced documents within this AD."},"complexity_factors":["Cross-reference to external regulatory and manufacturer documents — Requirement directs compliance 'in accordance with... FAA AD 2001-26-09 Amdt 39-12573' and notes Boeing Alert Service Bulletin 767-21A0154 Revision 1 (Requirement; Note). This necessitates consulting and following external technical material.","Applicability requires checking an external list — applies to 'All model 767 series aircraft having the line numbers listed in the requirement document' (Applicability), so operators must verify whether individual airframes are listed.","Two distinct mandated actions with separate deadlines — (1) inspect/rework/replace heater tape and ducts before 11 January 2004; (2) replace ducts or BMS 8-39 foam insulation before 11 July 2008 (Requirement; Compliance).","Multiple technical remedies — tasks include inspection, rework or replacement of water line heater tape and duct assemblies, and replacement of foam insulation (Requirement). These involve parts, labour and technical competence.","Safety‑critical consequence increases operational urgency — Background states the AD is to 'prevent ignition of foam insulation... which could result in a fire' (Background), creating compliance priority though not adding legal procedural complexity.","Statutory basis and formality — issued under CAR 1998 subregulation 39.1(1) and made effective with formal notification dates, so non‑compliance carries regulatory consequences (preamble/signature and Gazette notice)."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Boeing 767 line-numbered aircraft to inspect and, if needed, rework or replace flight‑compartment air‑distribution ducting and its water‑line heater tape, and later to replace certain foam insulation. It references FAA AD 2001‑26‑09 and a Boeing service bulletin. The stated purpose is to prevent ignition of duct insulation and a possible in‑flight fire, so affected operators must complete the mandated tasks by the stated deadlines."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a narrow, specific safety purpose: addressing fire risk in cockpit air distribution ducts. The scope remains tightly focused on the original safety issue without expansion into unrelated areas."},"complexity_factors":["Very short document (under 500 words)","Only 2 substantive requirements with clear deadlines","Single cross-reference to FAA AD 2001-26-09 (external technical standard)","Simple applicability test (specific Boeing 767 line numbers)","No nested exceptions or conditional logic","Minimal defined terms (only standard aviation acronyms like BMS 8-39)"],"plain_english_summary":"This CASA safety order mandates that operators of specified Boeing 767 aircraft fix a fire hazard in cockpit air‑conditioning duct insulation and associated heater tape.  \n\nIt affects airlines and other operators of those 767s, requires corrective inspections and replacements, and implements an FAA safety directive to prevent cockpit fires and avoid serious safety and regulatory consequences."},"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-b767-171-flight-compartment-air-distribution-duct","history":"/api/acts/ad-b767-171-flight-compartment-air-distribution-duct/history","analysis":"/api/acts/ad-b767-171-flight-compartment-air-distribution-duct/analysis","conflicts":"/api/acts/ad-b767-171-flight-compartment-air-distribution-duct/conflicts","importantCases":"/api/acts/ad-b767-171-flight-compartment-air-distribution-duct/important-cases","documents":"/api/acts/ad-b767-171-flight-compartment-air-distribution-duct/documents"}}