{"id":"F2008L04605","name":"AD/B767/249 - Auxiliary Fuel Tanks","slug":"ad-b767-249-auxiliary-fuel-tanks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":120948,"registerId":"commonwealth-F2008L04605-current","compilationNumber":null,"startDate":"2026-04-03","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/B767/249 | Auxiliary Fuel Tanks | 1/2009 |\n| ----------- | -------------------- | ------ |\n\n| Applicability: | Boeing 767-200 series aeroplanes fitted with auxiliary fuel tanks as detailed in STC ST00840NY.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Submit a report to the Manager, Systems and New Technologies, Airworthiness Engineering Group CASA, Fax (02) 6217 1914.The report must include the following information:(a) The aeroplane registration and auxiliary tank STC number installed.(b) The usage frequency in terms of total number of flights per year and total number of flights per year for which the auxiliary tank is used.2. Deactivate the auxiliary fuel tanks, in accordance with a deactivation procedure approved by CASA. Any auxiliary tank component that remains on the aeroplane must be secured and must have no effect on the continued operational safety and airworthiness of the aeroplane. Deactivation must not result in the need for additional instructions for continued airworthiness.Note 1: Appendix A of this AD provides criteria that should be included in the deactivation procedure. The proposed deactivation procedures should be submitted to the Manager, Systems and New Technologies, as soon as possible to ensure timely review and approval.Note 2: FAA AD 2008-22-01 Amdt 39-15696 dated 9 October 2008 refers. |\n| Compliance:    | For Requirement 1 - Within 45 days after the effective date of this AD.For Requirement 2 - Before 16 December 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n|                | This Airworthiness Directive becomes effective on 15 January 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n\n| Background: | This AD requires deactivation of PATS Aircraft, LLC, auxiliary fuel tanks. This AD results from fuel system reviews conducted by the manufacturer, which identified unsafe conditions for which the manufacturer has not provided corrective actions. The issuing of this AD is intended to prevent the potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapours, could result in fuel tank explosions and consequent loss of the aeroplane. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n27 November 2008\n\n| AD/B767/249Appendix A | Auxiliary Fuel Tanks | 1/2009 |\n| --------------------- | -------------------- | ------ |\n\nDeactivation Criteria\n\nThe auxiliary fuel tank deactivation procedure as detailed in Requirement 2 of this AD should address the following actions.\n\n1. Permanently drain auxiliary fuel tanks, and clear them of fuel vapours to eliminate the possibility of out-gassing of fuel vapours from the emptied auxiliary tank.\n\n2. Disconnect all electrical connections from the fuel quantity indication system (FQIS), fuel pumps if applicable, float switches, and all other electrical connections required for auxiliary tank operation, and stow them at the auxiliary tank interface.\n\n3. Disconnect all pneumatic connections if applicable, cap them at the pneumatic source, and secure them.\n\n4. Disconnect all fuel feed and fuel vent plumbing interfaces with aeroplane original equipment manufacturer (OEM) tanks, cap them at the aeroplane tank side, and secure them in accordance with a method approved by CASA; one approved method is specified in AC 25-8 Auxiliary Fuel System Installations. In order to eliminate the possibility of structural deformation during cabin decompression, leave open and secure the disconnected auxiliary fuel tank vent lines.\n\n5. Pull and collar all circuit breakers used to operate the auxiliary tank.\n\n6. Revise the weight and balance document, if required, and obtain CASA approval.\n\n7. Amend the applicable sections of the applicable aeroplane flight manual (AFM) to indicate that the auxiliary fuel tank is deactivated. Remove auxiliary fuel tank operating procedures to ensure that only the OEM fuel system operational procedures are contained in the AFM. Amend the Limitations Section of the AFM to indicate that the AFM Supplement for the STC is not in effect. Place a placard in the flight deck indicating that the auxiliary tank is deactivated. The AFM revisions specified in this paragraph may be accomplished by inserting a copy of this AD into the AFM.\n\n8. Amend the applicable sections of the applicable aeroplane maintenance manual to remove auxiliary tank maintenance procedures.\n\n9. After the auxiliary fuel tank is deactivated, accomplish procedures such as leak checks and pressure checks deemed necessary before returning the aeroplane to service. These procedures must include verification that the aeroplane FQIS and fuel distribution systems have not been adversely affected.\n\n10. Revise the instructions for continued airworthiness, as required, after deactivation.\n\n11. Include with the operator's proposed procedures any relevant information or additional steps that are deemed necessary by the operator to comply with the deactivation and return the aeroplane to service.","sortOrder":0},{"sectionNumber":"AD/B767/249","sectionType":"part","heading":"AD/B767/249","content":"## AD/B767/249","sortOrder":1},{"sectionNumber":"Auxiliary Fuel Tanks","sectionType":"part","heading":"Auxiliary Fuel Tanks","content":"## Auxiliary Fuel Tanks","sortOrder":2},{"sectionNumber":"1/2009","sectionType":"part","heading":"1/2009","content":"## 1/2009","sortOrder":3},{"sectionNumber":"AD/B767/249Appendix A","sectionType":"part","heading":"AD/B767/249Appendix A","content":"## AD/B767/249  \nAppendix A","sortOrder":4}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains a narrow, targeted scope focused specifically on deactivation of PATS auxiliary fuel tanks on Boeing 767-200 aircraft. The original intent was to address unsafe fuel tank conditions identified by the manufacturer, and the final directive does exactly that without expanding into broader regulatory territory."},"complexity_factors":["Single, clearly defined applicability (one aircraft type, one specific supplemental type certificate)","Two straightforward compliance requirements with fixed deadlines","11-item checklist in Appendix A with specific technical actions (draining, disconnecting, capping, manual revisions)","Minimal cross-referencing (only one reference to FAA AD 2008-22-01 and AC 25-8 as guidance)","No nested conditional logic or exceptions — requirements apply uniformly to all affected aircraft","Technical but not legally convoluted; written for aviation engineers rather than lawyers"],"plain_english_summary":"Owners/operators of Boeing 767-200s fitted with PATS Aircraft auxiliary fuel tanks (STC ST00840NY) must report tank installation and usage to CASA and permanently deactivate and secure the tanks by 16 Dec 2009 under CASA-approved procedures. \n\nCASA orders this because investigations found potential ignition sources inside the tanks that, with fuel vapour, pose an explosion risk; the manufacturer has not provided an acceptable repair, so removal from service is required."},"flash_summary":{"complexity_score":7,"scope_assessment":{"changed":true,"description":"This AD alters the operational scope for aircraft previously authorised to use the STC ST00840NY auxiliary tanks by mandating their deactivation (Requirement 2) and removal of STC-related procedures from the AFM (Appendix A, item 7). It therefore converts an approved supplemental capability into a prohibited/removed capability pending CASA-approved deactivation, affecting operators who relied on the STC while leaving unaffected 767-200s without that STC (Applicability)."},"complexity_factors":["Technical deactivation steps are detailed and multi-disciplinary (drain vapours; electrical, pneumatic, fuel plumbing disconnections; circuit-breaker collars) (Appendix A, items 1–5).","Regulatory approvals required from CASA for the deactivation procedure and for any weight-and-balance or AFM revisions (Requirement 2; Appendix A, items 6–7).","Administrative reporting requirement to CASA with specific data (aircraft registration, STC number, annual flight counts and usage frequency) within a short deadline (Requirement 1).","Multiple compliance deadlines (report within 45 days; deactivation by 16 Dec 2009; AD effective 15 Jan 2009) increase scheduling pressure (Compliance).","Workscope includes verification tasks (leak/pressure checks, FQIS and fuel distribution verification) before return to service, requiring maintenance resources and possible troubleshooting (Appendix A, item 9).","Document changes across several technical manuals and operational materials (AFM, maintenance manual, instructions for continued airworthiness) and placarding requirements (Appendix A, items 7–8, 10).","Narrow applicability (only 767-200s with STC ST00840NY) requires operators to identify affected fleet members and may create uneven impacts across operators (Applicability).","Dependence on external guidance and referenced materials (FAA AD 2008-22-01 and AC 25-8 cited), creating cross-jurisdictional compliance considerations (Requirement 2 Note 2; Appendix A, item 4)."],"plain_english_summary":"This Airworthiness Directive forces operators of Boeing 767-200 aircraft fitted with auxiliary fuel tanks under STC ST00840NY to both report tank usage to CASA and to deactivate those tanks under a CASA-approved procedure. Operators must stop using the auxiliary tanks by the stated compliance date and update manuals, placards and maintenance instructions accordingly.\n\nOperators (aircraft owners/operators) bear the costs and operational changes; CASA reviews and approves the deactivation procedure and any weight/balance or AFM amendments."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-249-auxiliary-fuel-tanks","history":"/api/acts/ad-b767-249-auxiliary-fuel-tanks/history","analysis":"/api/acts/ad-b767-249-auxiliary-fuel-tanks/analysis","conflicts":"/api/acts/ad-b767-249-auxiliary-fuel-tanks/conflicts","importantCases":"/api/acts/ad-b767-249-auxiliary-fuel-tanks/important-cases","documents":"/api/acts/ad-b767-249-auxiliary-fuel-tanks/documents"}}