{"id":"F2007L01194","name":"AD/A330/73 Amdt 1 - APU Generator Oil Pump Module","slug":"ad-a330-73-amdt-1-apu-generator-oil-pump-module","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65319,"registerId":"commonwealth-F2007L01194-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Airbus Industrie A330 Series Aeroplanes","sectionType":"division","heading":"Airbus Industrie A330 Series Aeroplanes","content":"### Airbus Industrie A330 Series Aeroplanes\n\n| AD/A330/73 Amdt 1 | APU Generator Oil Pump Module | 6/2007 DM |\n| ----------------- | ----------------------------- | --------- |\n\n| Applicability: | AIRBUS A330 series aircraft. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement: | 1. Carry out a one-time inspection of the inlet screen (last chance filter) for the Auxiliary Power Unit (APU) generator scavenge-oil pump for signs of debris and if necessary, apply the associated corrective actions, in accordance with the instructions of AIRBUS All Operators Telex (AOT) A330-24A3042 dated22 March 2007 or later EASA approved revisions.2. Additional requirement for A330 Aircraft operating under MMEL item 24-22-01 “AC Main Generation” or MMEL item 36-11-01 “Bleed Air Supply System failure”:Perform a check of the differential pressure indicator button on the lube filter and the generator scavenge filter in accordance with the instructions of AOT A330-24A3042 dated 22 March 2007 or later EASA approved revisions.The repetitive check of Requirement 2 is not required for aircraft operated under MMEL item 36-11-01 and provided the APU generator is removed or deactivated.Note: EASA Airworthiness Directive (AD) No. 2007-0080-R1 dated 13 April 2007 refers. AD No 2007-0080-R1 supersedes EASA Emergency AD No. 2007-0080-E dated 26 March 2007. |\n| Compliance: | 1. Unless already accomplished, no later than 31 May 2007.2. If applicable, before each flight, after the effective date of this AD, until31 May 2007. |\n| | This Amendment becomes effective on 1 May 2007. |\n| Background: | Two A330 operators have reported uncontained APU generator failures on ground. In both events, a loud noise was heard, followed by an APU automatic shutdown. |\n\n| | Preliminary investigations confirmed an uncontained APU Generator failure with subsequent aircraft structural damage to the APU compartment and, in one case, to the stabiliser compartment. Loose APU generator parts can lead to damage to the APU fire wall which might reduce its fire extinguishing capability, possibly leading to a temporary uncontrolled fire which constitutes an unsafe condition. Investigations are ongoing to determine the root causes of both events.The intent of the AD is to mandate a one time inspection in order to get a complete fleet status.The current amendment of this AD provides relief to the operators from complying with Requirement 2 in certain circumstances.The original issue of this AD became effective on 29 March 2007. |\n| --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nDavid Punshon \nDelegate of the Civil Aviation Safety Authority\n\n26 April 2007","sortOrder":0},{"sectionNumber":"AD/A330/73 Amdt 1","sectionType":"part","heading":"AD/A330/73 Amdt 1","content":"## AD/A330/73 Amdt 1","sortOrder":1},{"sectionNumber":"APU Generator Oil Pump Module","sectionType":"part","heading":"APU Generator Oil Pump Module","content":"## APU Generator Oil Pump Module","sortOrder":2},{"sectionNumber":"6/2007 DM","sectionType":"part","heading":"6/2007 DM","content":"## 6/2007 DM","sortOrder":3}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of addressing APU generator oil pump safety. It does not expand into new aircraft systems or unrelated safety areas. The amendment narrows the application of Requirement 2 (providing relief to operators in certain circumstances) but this is a refinement within the original safety purpose, not a scope expansion."},"complexity_factors":["Short, single-purpose document (2 main requirements only)","Minimal defined terms (only standard aviation acronyms like APU, MMEL, AOT)","Simple conditional logic: Requirement 2 only applies to aircraft operating under specific MMEL items, with one clear exception","Single cross-reference to an EASA (European) Airworthiness Directive","Clear compliance dates and deadlines","No nested exceptions or recursive definitions"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of Airbus A330s to inspect the APU oil pump inlet screen for metal debris (one-time check by 31 May 2007) after reports of APU generator explosions that can breach fire walls. Until 31 May 2007, crews must also check oil-filter pressure before flight when specific MMEL items are deferred, unless the APU generator is removed or shut off. This amendment relaxes some earlier, stricter inspection requirements."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment narrows the operational burden compared with the original AD by providing relief from the repetitive pre-flight check (Requirement 2) for aircraft operated under MMEL item 36-11-01 when the APU generator is removed or deactivated. The original AD imposed the repetitive check without this specific relief; the amendment therefore reduces obligations for a subset of operators while keeping the one-time inspection requirement intact."},"complexity_factors":["Two substantive requirements only: one-time inspection (Requirement 1) and conditional repetitive pre-flight check (Requirement 2)","Single referenced service instruction: AIRBUS AOT A330-24A3042 (22 March 2007) or later EASA-approved revisions","Specific cross-reference to two MMEL items (24-22-01 and 36-11-01) creating a conditional applicability for Requirement 2","Exception carved out for aircraft with APU generator removed or deactivated (conditional relief)","Limited number of compliance deadlines (one immediate fleet-wide deadline and a temporary before-each-flight requirement until a fixed date)","References to EASA AD No. 2007-0080-R1 and prior emergency AD, but no deep network of legislative cross-references"],"plain_english_summary":"**What the rule does**\n\n- This Airworthiness Directive (AD) requires operators of Airbus A330 series aircraft to carry out a one-time physical inspection of the inlet screen (the \"last chance\" filter) on the APU (Auxiliary Power Unit) generator scavenge-oil pump, and to perform any corrective actions found necessary. (Requirement 1)\n- For A330 aircraft that are being operated with certain Minimum Equipment List (MMEL) items in effect — specifically MMEL item 24-22-01 (AC Main Generation) or MMEL item 36-11-01 (Bleed Air Supply System failure) — there is an additional temporary requirement to check the differential pressure indicator button on the lube filter and the generator scavenge filter before each flight until a specified cut-off date. (Requirement 2)\n- The AD gives an exception: the repetitive pre-flight check in Requirement 2 is not required for aircraft operating under MMEL item 36-11-01 if the APU generator has been removed or deactivated. (Requirement 2)\n- The AD points operators to Airbus All Operators Telex (AOT) A330-24A3042 dated 22 March 2007 (or later EASA-approved revisions) for the exact inspection and corrective-action procedures. (Requirement 1 & 2)\n\n**Who this affects**\n\n- Airlines and operators of Airbus A330 series aeroplanes, and their maintenance organisations and personnel who perform APU and filter inspections and corrective maintenance. Ground operations staff who perform pre-flight checks are also affected where the repetitive pre-flight check applies. \n\n**Why it matters (practical mechanics and risk basis)**\n\n- The AD was prompted by reports of two APU generator failures on the ground that produced loud noises and automatic APU shutdowns; preliminary investigation found uncontained APU generator failures that caused structural damage in the APU compartment and, in one case, to the stabiliser compartment. (Background)\n- Loose generator parts or debris in the scavenge-oil pump inlet screen could damage the APU firewall and reduce fire-extinguishing capability, increasing the risk of an uncontrolled fire in the APU area. The inspection is intended to determine fleet status quickly (one-time inspection) and to prevent further events while investigations continue. (Background; Requirement 1)\n\n**How it works in practice (who pays, who decides, and what changes)**\n\n- Who pays: the aircraft operator bears the direct costs — technician labour to perform the inspection, potential replacement parts, corrective maintenance, and possible aircraft downtime. \n- Who decides: operators must follow the AOT procedures and comply with the AD; maintenance organisations must certify the work. An operator can choose to remove or deactivate the APU generator (where operationally acceptable) to avoid the repetitive pre-flight check for the specific MMEL condition noted. (Requirement 2)\n- Behavioural change: operators must schedule and complete a one-time inspection fleet-wide by the compliance deadline, and affected operators may need to add a pre-flight differential-pressure check until the temporary deadline or take the step of removing/deactivating the APU generator to eliminate that recurring check. (Compliance; Requirement 2)\n\n**Costs, incentives and trade-offs**\n\n- Direct costs: labour for inspection, any corrective actions (cleaning, parts replacement), and aircraft downtime. These are concentrated on operators of the A330 fleet.\n- Incentives: since removing or deactivating the APU generator relieves an operator from the repetitive check under one MMEL condition, operators face a trade-off between the operational value of the APU (for ground power or other uses) and the cost and time of repeated pre-flight checks. Operators with frequent short flights may judge repeated checks more burdensome and may elect deactivation, which has operational consequences.\n- Opportunity cost: time spent on inspections and repeated pre-flight checks displaces other maintenance or operational activity and can reduce aircraft availability.\n- Implementation risk and compliance burden: the AD depends on operators following the AOT procedures precisely; inconsistent interpretation or limited access to the inlet screen (physical access constraints) could increase labour time or prolong grounding. The temporary nature of the repetitive checks concentrates effort in the short term (compliance dates are specified). (Requirement 1; Compliance)\n\n**Administrative and cross-reference notes**\n\n- The AD points to Airbus AOT A330-24A3042 (22 March 2007) for the detailed inspection/corrective steps and to EASA AD No. 2007-0080-R1 for related regulatory history. The AD also clarifies that the repetitive check is not required in a limited circumstance (APU generator removed/deactivated) for one of the MMEL conditions. (Requirement 1 & 2)\n\n**Summary of purpose-claim and practical test**\n\n- Stated purpose: to obtain a complete fleet inspection status quickly and to prevent further uncontained APU generator failures that could cause structural damage and fire risk (Background). \n- Practical test against costs and incentives: the AD enforces a one-time data-gathering inspection (low to moderate concentrated cost) and imposes a temporary pre-flight check for a subset of operations (potentially high operational burden while in effect). It creates a clear operational choice for affected operators (perform repeated checks or remove/deactivate the APU generator) that shifts costs between maintenance effort and operational capability. (Requirement 1 & 2)\n"}},"importantCases":[],"_links":{"self":"/api/acts/ad-a330-73-amdt-1-apu-generator-oil-pump-module","history":"/api/acts/ad-a330-73-amdt-1-apu-generator-oil-pump-module/history","analysis":"/api/acts/ad-a330-73-amdt-1-apu-generator-oil-pump-module/analysis","conflicts":"/api/acts/ad-a330-73-amdt-1-apu-generator-oil-pump-module/conflicts","importantCases":"/api/acts/ad-a330-73-amdt-1-apu-generator-oil-pump-module/important-cases","documents":"/api/acts/ad-a330-73-amdt-1-apu-generator-oil-pump-module/documents"}}