AD/B767/230 - Fire Extinguishing Tube Chafing

Several key concepts underpin the operation of this airworthiness directive. First, airworthiness directive is a mandatory regulatory instrument issued under the Civil Aviation Safety Regulations (CASR) Part 39. It requires the aeroplane owner or operator to perform specific actions to maintain the aeroplane’s certificate of airworthiness. Non-compliance grounds the aeroplane and may result in enforcement action. Second, metered fire extinguisher system refers to a suppression system that discharges a measured quantity of extinguishing agent into the cargo compartment. The AD focuses on the tube assemblies that deliver that agent. The term discharge tube assembly and fire extinguishing tube are used interchangeably; the assembly includes the tube, brackets, insulation, and couplings. Third, detailed inspection is a high-magnification visual check (typically using a borescope or mirror) of a specific area for damage, wear, or discrepancies. The AD requires a detailed inspection in Requirement 1(a) for the tube assemblies between STA 1140 and STA 1340. This is more intensive than a general visual inspection. Fourth, general visual inspection is a less rigorous check, generally from arm’s length, without special equipment, to identify obvious defects. Requirement 1(a) also requires a general visual inspection for discrepancies of the tube assemblies, and Requirement 2(a) requires a general visual inspection for sufficient clearance between the tube and APU duct. The distinction matters because the level of effort, skill, and cost differs. Fifth, corrective actions are the steps to remedy any discrepancies found. The AD specifies they must be performed in accordance with the applicable Boeing service bulletin. This means the operator must purchase, access, and follow the proprietary engineering data from Boeing. The AD does not itself describe the corrective techniques; it incorporates that content by reference. This incorporation is legally binding. Sixth, terminating action occurs when the tube assembly is installed in the correct location (Requirement 1) or modified per the specified service bulletin (Requirement 2). After terminating action, repetitive inspections cease for that assembly, reducing ongoing compliance burden. But terminating action does not exempt the operator from other AD requirements; each assembly must be separately addressed. Seventh, service bulletin and alert service bulletin are non-mandatory manufacturer communications that become mandatory when referenced in an AD. The AD identifies specific bulletins by revision level. Using an earlier revision that differs from the one listed does not constitute compliance unless specifically credited. The credit for actions accomplished previously concept allows operators who already performed the work using earlier revisions to avoid repeating the same work, but only if those revisions are explicitly listed. This reduces double cost but imposes a documentary burden to prove the actions were done per the listed revision. Eighth, STA (station) references are measured positions along the aeroplane fuselage from a datum point, used to locate specific structural zones. Operators must map their maintenance records to these positions. Finally, FAA AD 2007-10-03 is referenced as a note, indicating that Boeing 767 operators holding US registration or operating under FAA oversight must also comply with that directive. Australian operators need to be aware of dual regulatory obligations if the aeroplane is registered in both jurisdictions or operated under interchange agreements.

The directive directly binds all operators of Boeing 767-200 and 767-300 series aeroplanes on the Australian register that have a metered fire extinguisher system in the aft cargo compartment. This includes airlines, freight operators, charter operators, and any private or corporate owners of such aircraft. However, because these are large commercial jet airliners, the practical population is limited to a few operators that owned or operated 767s in Australia around 2007: primarily Qantas (and its predecessor operations), Jetstar (for a period), and smaller cargo operators. Leasing arrangements also trigger obligations. The lessee (operator) is typically responsible for maintaining airworthiness, but the lessor (owner) may have contractual requirements to ensure compliance. The AD also places duties on certified maintenance organisations (CAMOs or Part 145 organisations) that perform the inspections and corrective actions. Their engineers and technical staff must be trained on the specific service bulletin instructions, and the organisation must have access to the current revisions of the bulletins. The compliance burden extends to continuing airworthiness management organisations (CAMOs) that manage the operator’s airworthiness program. They must update the airworthiness directive register, schedule the inspections within the 24-month/8,000-flight-hour window, and maintain records of accomplishment. The spare parts and engineering supply chain is affected because corrective actions may require ordering replacement tube assemblies, brackets, or insulation kits from Boeing. Lead times and inventory costs matter. The AD also indirectly affects Boeing as the manufacturer, which produced the service bulletins and must support the supply of parts and technical queries. The operator may need to seek alternative means of compliance (AMOC) from CASA if the required parts or data are unavailable or if a different method achieves equivalent safety. The AMOC process involves CASA review and approval, adding administrative cost and delay. The directive does not affect operators of 767-400 series (not listed) or 767s without the metered system. It also does not cover other cargo compartments (forward, bulk). Over time, many 767s subject to this AD have been retired or exported from Australia, but some may remain registered under Australian certificates of airworthiness, especially freighters. The compliance cost per aircraft varies. A detailed inspection of the tube assemblies may require removing cargo liner panels, accessing confined spaces in the aft cargo compartment, possibly using specialised inspection tools. Labour hours could range from a few hours to over a day, depending on access and the number of assemblies. If discrepancies are found, corrective actions may involve replacing tubes, adjusting bracketry, or modifying ducts. Parts, labour, and grounding cost at the compliance deadline. The repetitive inspection interval of 24 months or 8,000 flight hours means that over the remaining life of the aircraft, this AD imposes recurring direct costs plus the opportunity cost of aircraft downtime. Operators with large fleets must coordinate maintenance visits to minimise unscheduled downtime. For operators that already complied with earlier service bulletins before the effective date, the AD provides credit but still requires documentary evidence and may require additional inspections if the earlier actions were based on pre-revision bulletins not listed. The AD effectively forces harmonised action across all Australian operators to a common standard.

The primary duty is imposed on the operator (or the registered operator if different) to ensure the aeroplane meets the requirements of the airworthiness directive. This is a strict liability duty under CASR Part 39. The operator must either complete the inspections and corrective actions described in the AD or obtain an alternative means of compliance approved by CASA. The duty includes ensuring that maintenance personnel have access to the correct revision of the referenced Boeing service bulletins. The AD does not expressly state the duty to maintain records, but CASR Part 42 requires that all maintenance actions, including AD compliance, be entered into the aeroplane’s continuing airworthiness records. Thus, the operator must record the date, method, findings, and person who performed the work. The operator also has a duty to report any significant discrepancies found during the inspections to CASA through standard mandatory occurrence reporting processes, though this AD does not create a separate reporting obligation. The operator’s right to use alternative means of compliance is implied by the broader CASR framework, but the AD does not explicitly mention it. The operator may apply to CASA for approval of a different inspection method, a different compliance interval, or a different corrective action, provided it meets the safety objective. The AD also grants a right to credit for actions accomplished previously if performed in accordance with listed earlier revisions of the service bulletins. This right reduces duplication of effort if the operator can document that the earlier work meets the specified revision. However, if the operator used a version of the service bulletin that is not listed in the AD, that credit is not automatic; the operator would need to seek an AMOC. Another right is the ability to terminate repetitive inspections for a particular assembly by achieving the terminating action (correct installation or modification). This reduces ongoing compliance burden, though the operator must ensure the terminating action is performed per the AD. The AD does not grant any right to extend compliance deadlines. It is peremptory: the initial compliance time is absolute, with no provision for extensions unless via AMOC. That means operators must plan maintenance slots carefully. The AD also implies a duty on maintenance organisations to competently perform the detailed and general visual inspections and to strictly follow the service bulletin instructions. The organisation must have qualified personnel with appropriate training for borescope or detailed inspection techniques. The organisation may also have a right to decline performing the work if the operator fails to provide the correct revision of the service bulletin or if the required parts are unavailable, but that creates a practical problem: the aeroplane remains non-compliant until the issue is resolved. Finally, the AD references FAA AD 2007-10-03. For aeroplanes holding US certificates of airworthiness (common with leased aircraft), the operator must comply with both the CASA AD and the FAA AD. The duties and rights are then dual, and in case of conflict, the more restrictive requirement applies. That adds another layer of compliance burden.

The AD itself does not specify penalties, but non-compliance is a breach of CASR Part 39, which is enforceable under the Civil Aviation Act 1988 (Cth) and associated regulations. The primary enforcement mechanism is CASA’s power to suspend or cancel the aeroplane’s certificate of airworthiness or the operator’s air operator’s certificate (AOC). Without a valid certificate, the aeroplane cannot be flown. This is a powerful deterrent: grounding an aircraft imposes immediate revenue loss. CASA can also issue direction to ground the aircraft until it is compliant. Additionally, CASA may take civil penalty action under the Civil Aviation Amendment Regulations 2008 (and earlier equivalent provisions) with maximum penalties that can reach hundreds of thousands of dollars for corporations for each day of non-compliance. The AD is a mandatory instrument, so any failure to meet the compliance deadline, even if unintentional, can constitute an offence of strict liability. That means the operator does not need to have intended to breach; it is enough that the aeroplane was operated with a component that did not meet the AD requirements. However, the operator may have a defence if they can prove they took all reasonable steps to comply and could not do so (e.g., due to lack of parts despite best efforts). The burden of proof then shifts to the operator. CASA also conducts surveillance audits and may review operator’s AD compliance records. If a discrepancy is found during an audit, CASA can issue a report, a non-compliance notice, or pursue formal enforcement. Criminal penalties, including fines and imprisonment, could apply if a person knowingly operates an aircraft that is unsafe or fails to comply with an AD, under section 20A of the Civil Aviation Act (reckless operation). The AD’s background notes that the purpose is to prevent a fire suppression failure. If a fire occurred and the extinguishing system failed due to non-compliance, the operator could face severe sanctions including prosecution for endangering safety. The enforcement approach is not limited to the AD text; it draws from the broader legal framework. Practical enforcement may also come from insurers, who may deny coverage for losses arising from non-compliance with an AD. Banks and lessors may also require AD compliance under loan or lease agreements, with default provisions. Thus, the private sector also enforces compliance. The AD’s reference to the FAA AD means that Australian operators of US-registered aircraft face enforcement from the FAA as well. That could include fines, revocation of the FAA certificate of airworthiness, and impediments to operating in US airspace. In practice, the small number of Boeing 767 operators in Australia means CASA may focus compliance resources on periodic audits rather than aggressive enforcement. But the potential consequences are severe enough to rationalise compliance as a risk management priority. The cost of non-compliance - grounded aircraft, loss of revenue, legal fees, reputational damage - typically far exceeds the cost of the inspection itself.

This airworthiness directive sits within a layered regulatory environment. Its primary legal foundation is CASR Part 39 (Division 39.2) which gives CASA the power to issue mandatory airworthiness directives. The AD itself is a legislative instrument, but it is not a regulation; it is a specific direction to aircraft operators. It interacts with CASR Part 42 (Continuing Airworthiness) which requires operators to maintain each aeroplane in an airworthy condition. Compliance with all applicable ADs is a component of that duty. Part 42 also requires that all maintenance actions be performed by authorised persons and recorded. The AD’s inspections and corrections must be entered into the aeroplane’s maintenance records and, if the aeroplane operates on a Maintenance Control Manual (MCM), the MCM must be updated to reflect the new compliance schedule. The AD interacts with CASR Part 145 (Maintenance Organisations) if the inspections and corrective actions are contracted out. The Part 145 organisation must have the service bulletins, tools, and approved data; the operator must ensure the organisation is appropriately authorised. The AD also interacts with Part 21 (Certification of Aircraft) insofar as any modification to the fire extinguishing tube assembly may constitute a design change. If the service bulletin introduces a substantial modification that affects type design, it may require approval from a design organisation or CASA. However, the AD states that the actions must be done in accordance with the service bulletin, which typically comes with an FAA or CASA approved design change or at least acceptable data. The operator’s obligation is to follow the bulletin; separate design approval is not needed. The AD references FAA AD 2007-10-03 as a note. This creates a cross-border interaction for aircraft that are dual-registered or operated under a code-share agreement. For a Boeing 767 registered in the United States but operated by an Australian carrier under a lease, both the FAA and CASA ADs apply. The compliance times are identical (24 months/8,000 flight hours), so there is no conflict in timing. However, the Australian operator must ensure they comply with the CASA AD specifically, because CASA enforces against the Australian operator, not the US owner. The operator must also keep records that satisfy both authorities. The AD interacts with Civil Aviation Act 1988 section 20A (reckless operation) and section 20B (endangering safety). If a fire occurs and the extinguishing system fails because the tube chafed through and leaked agent, a court could find the operator acted recklessly if they failed to comply with this AD. The Act also creates offences for providing false information. If an operator falsely certifies that the inspections were performed, they face liability. The AD interacts with state and territory workers’ compensation and workplace health and safety laws indirectly. Maintenance personnel performing the inspections must be provided with a safe workspace, adequate lighting, and safe access in the cargo compartment. The AD does not relieve the operator of general duties under health and safety legislation. Finally, the AD interacts with contract law through leases, loan agreements, and supply contracts. Lessors often require AD compliance as a condition of the lease. If the operator fails to comply, it may be in default, leading to repossession or penalties. Insurance policies for hull and liability invariably require the aircraft to be maintained in accordance with airworthiness directives. Non-compliance may void coverage.

Based solely on the source document, this airworthiness directive (AD/B767/230, number 7/2007) was issued by CASA on 24 May 2007 and became effective on 5 July 2007. It is an original issue; the text contains no indication that it supersedes, revokes, or amends any previous CASA AD. However, the AD provides “Credit for Actions Accomplished Previously,” which means that work performed before the effective date in accordance with earlier revisions of the referenced Boeing service bulletins is considered acceptable. That implies that earlier informal or alert service bulletins existed and that operators may have already performed some corrective actions voluntarily. But this is not an amendment to the AD itself. The AD references FAA AD 2007-10-03; the correspondence suggests a degree of harmonisation. Over time, CASA may have issued subsequent amendments to this AD, such as to change compliance intervals or to correct typographical errors. Such amendments would be separate CASA instruments and are not reflected in the source. Similarly, the Boeing service bulletins referenced (767-26A0130 Revision 2 and 767-26-0118 Revision 2) are revised versions; earlier revisions existed. The AD does not incorporate later revisions automatically. If Boeing later issued Revision 3 of the service bulletin, operators could not rely on it for compliance unless CASA issued a superseding AD. The life cycle of this AD may include eventual cancellation if the fleet is no longer in Australian service or if the design is superseded. The source shows only the current state at issuance. For a compliance professional, the amendment history matters because reliance on an outdated AD could lead to enforcement. Therefore, operators must check the CASA Airworthiness Directives Database to confirm whether this AD has been amended, superseded, or revoked since 2007. The source cannot answer that question. The absence of amendment language in the source does not mean no amendments exist; it means the source is the original instrument. The typical practice is that CASA issues a new AD number for major changes or a “Revision” note. Given the date, this AD is now over 17 years old. Many 767s have been retired, but if any remain, the operator must check for later updates. This deep dive must remain source-grounded, so we cannot assume any changes.

The source document does not cite any litigation. It is an administrative instrument, not a court judgment. It is therefore unknown from the source whether any enforcement action or challenge related to this specific AD occurred. In general, airworthiness directives are rarely challenged in court; they are issued under delegated legislative power and are considered necessary for safety. Judicial review is available under the Administrative Decisions (Judicial Review) Act 1977, but operators typically do not litigate because they cannot operate non-compliant aircraft while a challenge is pending. Grounding is immediate and financially destructive. Consequently, almost all AD compliance occurs without litigation. There is no reported Australian case specifically concerning AD/B767/230. There may be cases concerning broader AD enforcement principles under the Civil Aviation Act, but none are referenced. The AD also references FAA AD 2007-10-03. In the United States, there may have been litigation over Boeing’s liability for the underlying chafing issue, but that would be products liability, not AD enforcement. The source does not mention any such litigation. In drafting this deep dive, we cannot invent cases. The reader should understand that the absence of litigation does not mean the AD is unimportant; it simply indicates that most operators complied rather than fought. The cost of non-compliance - grounded fleet, lost revenue, regulatory scrutiny - outweighs the cost of compliance. Also, the strict liability nature of AD compliance means a defence of “the AD was invalid” is extremely difficult to mount. The operator would need to show that the AD was ultra vires, irrational, or procedurally flawed. Given that CASA has broad discretion to issue ADs based on safety reports, that threshold is high. In practice, the only likely disputes are over whether a particular inspection was done correctly or whether an alternative means of compliance should have been approved. Those disputes are administrative, not litigated. They may culminate in internal CASA review or an application to the Administrative Appeals Tribunal (AAT). There is no reference to an AAT decision in the source. The note about FAA AD 2007-10-03 means that US litigation could potentially affect Australian operators if the FAA actions are tied to US court orders, but that is speculative. Therefore, the litigation history from the source is nil. The deep dive must state that clearly.

Several nuances in this AD could trap an unwary operator. First, the AD applies only to aeroplanes with a metered fire extinguisher system in the aft cargo compartment. Some 767s may be configured with a different extinguishing system (e.g., high-rate discharge) or no system at all. The operator must verify the exact configuration of each tail number. A misidentification leads to either unnecessary work (cost) or non-compliance if the system is present but ignored. Second, the AD splits obligations into two requirements based on the aircraft identification in two different Boeing service bulletins. Requirement 1 applies to planes per Service Bulletin 767-26A0130 Revision 2. Requirement 2 applies to planes per Alert Service Bulletin 767-26A0123. These may overlap; a single aircraft could be listed in both bulletins. The operator must perform both sets of inspections and modifications. The AD does not say that one subsumes the other. Third, the terminating action for requirement 1 is “installation of the tube assembly in the correct location.” This means if the inspection finds the assembly is already installed correctly, the repetitive inspections cease. But the operator must still perform the initial detailed and general visual inspections to confirm that. If the assembly is already correctly installed, the AD requires no further action after initial inspection, but the operator must document that verification. The gotcha is that if the operator assumes all assemblies are fine without inspection, they breach the AD. Fourth, the repetitive inspection interval is 24 months or 8,000 flight hours, whichever occurs first. This is a dual trigger. An operator that only tracks flight hours may miss a 24-month calendar deadline if the aircraft has low utilisation. Conversely, an aircraft with high utilisation may hit 8,000 flight hours before 24 months. The operator must track both metrics and schedule inspections before the earliest threshold. Fifth, the credit for actions accomplished previously only extends to specific earlier revisions. Requirement 1 credit is given for Boeing Alert Service Bulletin 767-26A0130 original issue or Revision 1. If the operator used a later revision (e.g., Revision 3, which did not exist at the time but could later), it is not credited. The AD is static in its incorporation by reference. Sixth, the AD requires work to be done in accordance with the service bulletin. The service bulletin contains proprietary Boeing data. The operator must have access to the correct revision. If the operator only has an earlier revision, the work may not meet the AD requirement. Purchasing the correct revision has a cost. Seventh, the AD does not specify which person or organisation can authorise a return to service after the corrective actions. Under CASR Part 42, a certificate of release to service (CRS) is required. The AD does not override that; it adds an additional layer. Eighth, the AD was issued in 2007. Any 767 still operating in Australia today (rare) may have had this work done years ago, but the repetitive inspection requirement continues unless the terminating action was completed for each assembly. The operator must still have records proving that. If records are lost, the operator may have to repeat the work. Finally, the AD reference to FAA AD 2007-10-03 is only a note, but it means that the FAA AD is also legally enforceable for US-registered aircraft. An Australian operator that leases a US-registered 767 cannot simply ignore the FAA side. The gotcha is that the FAA AD may have different compliance documentation requirements or later amendments not reflected in this CASA AD. The operator must monitor both. Also, the FAA AD might have a different effective date or applicability wording. The operator should not assume that compliance with CASA AD equals compliance with FAA AD; they should verify.

Compliance involves a systematic process. Step one: Confirm applicability. Obtain the exact aircraft serial numbers and registrations. Check the aircraft’s maintenance records to verify it has a metered fire extinguishing system in the aft cargo compartment. Identify whether the aircraft is listed in Boeing Service Bulletin 767-26A0130 Revision 2 and/or Boeing Alert Service Bulletin 767-26A0123. If it is listed in neither, the AD does not apply. If it is listed in one or both, proceed. Step two: Procure the correct service bulletins. Purchase or access Boeing Service Bulletin 767-26A0130, Revision 2, and Boeing Alert Service Bulletin 767-26A0123, and, for requirement 2, Service Bulletin 767-26-0118, Revision 2. Ensure the revision level matches exactly what the AD specifies. If the operator already performed work using earlier revisions credited, keep records of that but still obtain the listed revisions to plan inspection intervals. Step three: Schedule the initial inspections. The compliance time is within 24 months or 8,000 flight hours after 5 July 2007. This is historically the effective date. For any aircraft still on the register today, the initial compliance deadline has long passed; the operator must now be on the repetitive schedule. The operator must have records confirming the first inspection and any terminating actions. If there are no records, the operator must treat the AD as if it is a new application and perform the initial inspection immediately. Step four: Perform the inspections. For requirement 1(a), have a certified maintenance engineer conduct a detailed inspection and a general visual inspection of the fire extinguishing tube assemblies between STA 1140 and STA 1340, plus the insulation and bleed air duct couplings of the APU. Use appropriate tools and lighting. For requirement 2(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. Document findings. If any discrepancy (chafing, holes, cracks, insufficient clearance) is found, proceed to corrective actions. Step five: Perform corrective actions. For any discrepancy found during requirement 1 inspection, do all applicable corrective actions per the service bulletin. For requirement 2, if there is insufficient clearance, modify the tube assembly per Service Bulletin 767-26-0118 Revision 2. All corrective actions must be done before further flight. Step six: Record terminating action. If the assembly is correctly installed (requirement 1) or modified (requirement 2), record that as terminating action for that assembly. The operator can then cease repetitive inspections for that assembly, but must still comply for any other assemblies not terminated. Step seven: Establish the repetitive inspection schedule. For any assembly without terminating action, schedule the next inspection within 24 months or 8,000 flight hours from the previous inspection. The operator must track both calendar time and flight hours for each aircraft. Use an airworthiness directive compliance database or system. Step eight: Apply for an alternative means of compliance if needed. If the required parts are unavailable, or if the service bulletin instructions cannot be implemented for a genuine reason, submit an AMOC application to CASA with supporting justification. CASA may approve a different method or timeline. Do not assume an extension. Step nine: Maintain records. Keep copies of the AD, the service bulletins used, inspection reports, photographs of findings, corrective action records, and CRS entries. Ensure traceability to each aeroplane serial number. Step ten: Monitor for amendments. Periodically check the CASA Airworthiness Directives Database for any later amendments or supersession of AD/B767/230. Also check the FAA database for updates to the referenced FAA AD. Streamline compliance by integrating AD tracking into the operator’s continuing airworthiness management system. The cost of compliance includes labour, materials, service bulletin purchase, and possible grounding. But given the AD has been in effect for over 17 years, for remaining 767s, most actions should already be complete. The key operational risk is loss of documentation leading to repetition of work.