{"id":"F2008L02817","name":"AD/B727/213 - Auxilary Fuel Tanks","slug":"ad-b727-213-auxilary-fuel-tanks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74999,"registerId":"commonwealth-F2008L02817-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 727 Series Aeroplanes","sectionType":"division","heading":"Boeing 727 Series Aeroplanes","content":"### Boeing 727 Series Aeroplanes\n\n| AD/B727/213 | Auxilary Fuel Tanks | 9/2008 |\n| ----------- | ------------------- | ------ |\n\n```html\n

Applicability:

Model 727 aeroplanes equipped with auxiliary fuel tanks installed in accordance with specified United States Federal Aviation Administration (FAA) Supplemental Type Certificates (STC) as follows:

Aeroplane Series

Auxiliary Tank STC

727-100

SA2970WE, SA3674WE, SA3157WE, SA3319WE, SA3559WE, SA2734WE, SA3920NM, SA3810WE, SA1979NM, SA1398NM and SA3483WE

727-200

SA3065WE and SA1051NW

Requirement:

Deactivate the auxiliary fuel tanks, in accordance with an approved deactivation procedure. 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 may not result in the need for additional instructions for continued airworthiness.

Note 1: Appendix A of this Directive provides criteria that should be included in the deactivation procedure.

Note 2: FAA AD 2008-12-03 Amdt 39-15546 refers.

Compliance:

On or before 16 December 2008.

This Airworthiness Directive becomes effective on 28 August 2008.

\n```\n\n| Background: | This Directive requires deactivation of Rogerson Aircraft Corporation auxiliary fuel tanks. The Directive results from fuel system reviews conducted by the manufacturer, which identified potential unsafe conditions for which the manufacturer has not provided corrective actions and is issued 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\n16 July 2008\n\n \nAppendix A - Auxiliary Fuel Tank Deactivation Criteria\n\nThe auxiliary fuel tank deactivation procedure required by this Directive 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\nNote: If applicable, removing the bladder might help eliminate out-gassing.\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 approved method; one approved method is specified in United Stated Federal aviation administration advisory Circular AC 25-8 Fuel Tank Systems 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 aircraft 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 Supplemental Type Certificate 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 Directive 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 fuel quantity indication system and fuel distribution systems have not been adversely affected.\n\n10. 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/B727/213","sectionType":"part","heading":"AD/B727/213","content":"## AD/B727/213","sortOrder":1},{"sectionNumber":"Auxilary Fuel Tanks","sectionType":"part","heading":"Auxilary Fuel Tanks","content":"## Auxilary Fuel Tanks","sortOrder":2},{"sectionNumber":"9/2008","sectionType":"part","heading":"9/2008","content":"## 9/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive applies only to Boeing 727-100 and 727-200 aeroplanes fitted with the listed Rogerson/FAA STC auxiliary tanks and requires their deactivation per Appendix A. It implements the manufacturer’s fuel-system review and does not broaden applicability beyond the named STCs or add other modification mandates."},"complexity_factors":["Technical deactivation steps: fuel draining, vapour clearance, disconnection/capping of electrical, pneumatic and fuel plumbing (Appendix A).","Regulatory approvals: deactivation must follow an 'approved deactivation procedure' and CASA approval is required for any weight-and-balance changes.","Documentation changes: AFM, maintenance manuals, placards and removal of STC AFM supplements must be amended.","Verification work: leak and pressure checks and verification that OEM fuel systems and FQIS are unaffected.","Limited scope tied to a list of specific FAA STCs and specific 727 series variants (identification burden for operators).","Reference to external material (FAA AD 2008-12-03 and AC 25-8) meaning operators may need to consult non-Australian sources."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Boeing 727-100 and 727-200 aeroplanes fitted with listed FAA Supplemental Type Certificate (STC) auxiliary fuel tanks to deactivate those tanks using an approved procedure by 16 December 2008. Deactivation must secure any remaining components and must not create new continued-airworthiness obligations. Operators must also update aircraft documentation and placard the flight deck to reflect the deactivation. Operators bear the cost of deactivation; CASA approves procedures and enforces compliance."},"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 its original narrow scope — addressing a specific unsafe condition in specific aircraft configurations. The Appendix A criteria expand on implementation details but do not broaden the regulatory reach beyond the identified safety issue."},"complexity_factors":["Single, clear operational requirement (deactivation) with 10 specific procedural steps in Appendix A","Limited applicability — only affects specific Boeing 727 models with enumerated STC numbers (13 different certificate numbers listed)","Straightforward compliance deadline (single date: 16 December 2008)","Some technical aviation terminology (FQIS, OEM, AFM, STC) but terms are standard industry usage and explained by context","No nested exceptions, conditional logic, or cross-references to other legislation beyond a single reference to FAA AD 2008-12-03","Short document — approximately 1 page of substantive content plus procedural checklist"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires operators of certain Boeing 727-100/200 aircraft with specified aftermarket auxiliary fuel tanks to permanently deactivate those tanks by 16 December 2008. \n\nIt follows manufacturer findings of potential ignition sources inside the tanks and, with no repair available, orders removal from service, draining/disconnection, securing any remaining components, flight manual updates and cockpit placards; it aligns with FAA AD 2008-12-03."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-213-auxilary-fuel-tanks","history":"/api/acts/ad-b727-213-auxilary-fuel-tanks/history","analysis":"/api/acts/ad-b727-213-auxilary-fuel-tanks/analysis","conflicts":"/api/acts/ad-b727-213-auxilary-fuel-tanks/conflicts","importantCases":"/api/acts/ad-b727-213-auxilary-fuel-tanks/important-cases","documents":"/api/acts/ad-b727-213-auxilary-fuel-tanks/documents"}}