{"id":"F2007L01574","name":"AD/B767/230 - Fire Extinguishing Tube Chafing","slug":"ad-b767-230-fire-extinguishing-tube-chafing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":66091,"registerId":"commonwealth-F2007L01574-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 767 Series Aeroplanes","sectionType":"division","heading":"Boeing 767 Series Aeroplanes","content":"### Boeing 767 Series Aeroplanes\n\n| AD/B767/230 | Fire Extinguishing Tube Chafing | 7/2007 |\n| ----------- | ------------------------------- | ------ |\n\n| Applicability: | Boeing Model 767-200 and -300 series aeroplanes with a metered fire extinguisher system in the aft cargo compartment. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. For aeroplanes identified in Boeing Service Bulletin 767-26A0130,Revision 2, dated 31 October 2006:a. Perform detailed and general visual inspections for discrepancies of the fire extinguishing tube assemblies between station (STA) 1140 and STA 1340, and the insulation of the metered fire extinguisher system and the bleed air duct couplings of the APU located in the aft cargo compartment, as detailed in the Accomplishment Instructions of Boeing Service Bulletin767-26A0130, Revision 2.b. Do all applicable corrective actions in accordance with the service bulletin.Installation of the tube assembly in the correct location, in accordance with the service bulletin, terminates the repetitive inspections for that assembly only.2. For aeroplanes identified in Boeing Alert Service Bulletin 767-26A0123, dated 22 August 2002:a. Perform a general visual inspection for sufficient clearance between the fire extinguishing tube and the APU duct on the left sidewall from STA 1355 through 1365 inclusive, and do all applicable modifications, by doing all the actions specified in the Accomplishment Instructions of Boeing Alert Service Bulletin 767-26A0123.b. If there is insufficient clearance between the fire extinguishing tube and the APU duct, accomplish the modification of the fire extinguishing tube assembly by doing all the actions specified in the Accomplishment Instructions of Boeing Service Bulletin 767-26-0118, Revision 2, dated21 December 2004.Accomplishing the modification in this requirement terminates the repetitive inspections for that assembly only. |\n\n| | Credit for Actions Accomplished PreviouslyAccomplishing the inspections and corrective actions required by requirement 1 of this AD before the effective date of this AD, in accordance with Boeing Alert Service Bulletin 767-26A0130, original issue, or Revision 1, dated 15 December 2005; is considered acceptable for compliance with the corresponding actions in requirement 1 of this AD.Accomplishing the actions required by requirement 2.b. of this AD before the effective date of this AD, in accordance with Boeing Service Bulletin 767-26-0118, original issue, or Revision 1, dated 3 October 2002; is considered acceptable for compliance with the corresponding actions in requirement 2.b. of this AD for accomplishing the modification of the fire extinguishing tube assembly.Note: FAA AD 2007-10-03 Amdt 39-15044 dated 30 April 2007 refers. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | 1. a. Within 24 months or 8,000 flight hours after the effective date of this AD, whichever is first.Thereafter repeat the inspections at intervals not to exceed 24 months or 8,000 flight hours, whichever occurs first.b. Before further flight, after the effective date of this AD.2. a. Within 24 months or 8,000 flight hours after the effective date of this AD, whichever occurs first. Do all applicable modifications before further flight following the inspections.b. Before further flight, after the effective date of this AD. |\n| | This Airworthiness Directive becomes effective on 5 July 2007. |\n| Background: | This AD was prompted by one report indicating that an operator found a hole in the discharge tube assembly for the metered fire extinguishing system; and another report indicating that an operator found chafing of the fire extinguishing tube against the auxiliary power unit (APU) duct that resulted in a crack in the tube. The issuing of this AD is intended to prevent fire extinguishing agent from leaking out of the tube assembly in the aft cargo compartment which, in the event of a fire in the aft cargo compartment, could result in an insufficient concentration of fire extinguishing agent, and consequent inability of the fire extinguishing system to suppress the fire. |\n\n![](image.001.png) \nDavid Villiers \nDelegate of the Civil Aviation Safety Authority\n\n24 May 2007","sortOrder":0},{"sectionNumber":"AD/B767/230","sectionType":"part","heading":"AD/B767/230","content":"## AD/B767/230","sortOrder":1},{"sectionNumber":"Fire Extinguishing Tube Chafing","sectionType":"part","heading":"Fire Extinguishing Tube Chafing","content":"## Fire Extinguishing Tube Chafing","sortOrder":2},{"sectionNumber":"7/2007","sectionType":"part","heading":"7/2007","content":"## 7/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The AD's scope aligns with its stated intent in the source: it targets Boeing 767-200/-300 aeroplanes with a metered aft-cargo extinguishing system and prescribes inspections, corrective actions and modifications to prevent tube chafing and agent leakage. It does not expand beyond the identified assemblies or aircraft configurations and provides credits for prior compliant actions under specified service bulletin revisions."},"complexity_factors":["Technical specificity: inspections target tube assemblies between STA 1140–1340 and APU duct area STA 1355–1365, requiring familiarity with airframe station numbering and compartment layout.","Multiple referenced documents and revisions: Boeing Service Bulletin 767-26A0130 Rev 2, Alert SB 767-26A0123, and SB 767-26-0118 Rev 2 are all relied on for required actions and acceptable prior compliance.","Dual compliance timing metric: actions must be done within 24 months or 8,000 flight hours (whichever is first) or before further flight for certain defects, requiring operators to track two clocks.","Repetitive-inspection regime with termination condition: inspections repeat at intervals until the tube assembly is installed in the correct location as specified by the service bulletin.","Credit/record validation: the AD accepts earlier accomplishment under prior SB issues or revisions as compliance, creating an evidentiary burden to validate historical work.","Variable corrective actions: required repairs/modifications are performed 'in accordance with the service bulletin' and may vary by airplane, affecting parts, labour and downtime estimates.","Limited applicability and configuration gating: only Boeing 767-200/300 with metered aft-cargo systems are affected, so operators must confirm configuration before applying requirements."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 767-200 and -300 aeroplanes fitted with a metered aft-cargo fire‑extinguishing system to inspect specified fire‑extinguishing tube assemblies for chafing or holes and to do required repairs or modifications following Boeing service bulletins. Recurring inspections continue until an assembly is installed in the correct location; some defects must be fixed before further flight. The measure aims to prevent loss of extinguishing agent from aft‑cargo leaks; operators pay for inspections and corrective work under CASA enforcement."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This AD maintains focused scope on the specific safety issue of fire extinguishing tube integrity in Boeing 767 aft cargo compartments. The requirements align precisely with the stated background regarding tube chafing and potential fire suppression failure. No scope creep is evident; the instrument addresses exactly the mechanical defect identified in the incident reports."},"complexity_factors":["Multiple overlapping applicability criteria requiring cross-referencing of specific Boeing Service Bulletins (767-26A0130 Rev 2 and 767-26A0123)","Dual compliance pathways (Requirement 1 and Requirement 2) with different inspection types, modification requirements, and termination conditions","Conditional termination clauses — repetitive inspections only terminate 'for that assembly only' when specific modifications are performed","Credit provisions for prior compliance referencing earlier revisions of service bulletins (original issue and Rev 1)","Dual metric compliance deadlines (calendar time vs flight hours — 'whichever is first') with different thresholds for initial compliance versus repetitive intervals","Technical aviation terminology requiring knowledge of aircraft station numbering (STA 1140, STA 1340, STA 1355-1365), APU systems, and fire suppression architecture","Cross-reference to foreign regulatory instrument (FAA AD 2007-10-03) indicating harmonised but multi-jurisdictional regulatory framework"],"plain_english_summary":"This CASA Airworthiness Directive applies to certain Boeing 767-200/300s with a specific aft cargo fire‑suppression system. It mandates recurring inspections (within 24 months or 8,000 flight hours) of fire‑extinguishing tubes and insulation, immediate repair before flight if damage is found, and rerouting/modification where clearance to the APU duct is inadequate. The goal is to stop chafed tubing from leaking suppressant and ensure rear‑cargo fires can be effectively extinguished."},"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-b767-230-fire-extinguishing-tube-chafing","history":"/api/acts/ad-b767-230-fire-extinguishing-tube-chafing/history","analysis":"/api/acts/ad-b767-230-fire-extinguishing-tube-chafing/analysis","conflicts":"/api/acts/ad-b767-230-fire-extinguishing-tube-chafing/conflicts","importantCases":"/api/acts/ad-b767-230-fire-extinguishing-tube-chafing/important-cases","documents":"/api/acts/ad-b767-230-fire-extinguishing-tube-chafing/documents"}}