{"id":"F2009L03065","name":"AD/A330/104 - PW4000 Engine - Lower Aft Pylon Fairing Firewall","slug":"ad-a330-104-pw4000-engine-lower-aft-pylon-fairing-firewall","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":80675,"registerId":"commonwealth-F2009L03065-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/A330/104 | PW4000 Engine - Lower AftPylon Fairing Firewall | 9/2009 |\n| ----------- | ----------------------------------------------- | ------ |\n\n| Applicability: | Model A330-223, -321, -322 and -323 aircraft, all serial numbers, except aircraft with AIRBUS modification 53623 incorporated in production or AIRBUS Service Bulletin (SB) A330-54-3022 incorporated in service.                  |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of DGAC AD F-2004-028 R2.Note 1: AIRBUS Service Bulletins A330-54-3021 initial issue and A330-54-3022 initial issue, or later DGAC/EASA approved revisions, refer.                      |\n| Compliance:    | Inspect at intervals not to exceed 1,000 flight hours; and if cracking is detected accomplish the actions specified in the Requirement document.Note 2: The repetitive inspections are terminated by incorporating SBA330-54-3022. |\n|                | This Airworthiness Directive becomes effective on 27 August 2009.                                                                                                                                                                  |\n| Background:    | Reports were received of cracks on the lower aft pylon fairing (LAPF) firewall of an A330 aircraft fitted with PW4000 series engines. This condition, if left uncorrected, would compromise the design of the firewall.            |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n15 July 2009","sortOrder":0},{"sectionNumber":"AD/A330/104","sectionType":"part","heading":"AD/A330/104","content":"## AD/A330/104","sortOrder":1},{"sectionNumber":"PW4000 Engine - Lower AftPylon Fairing F","sectionType":"part","heading":"PW4000 Engine - Lower AftPylon Fairing Firewall","content":"## PW4000 Engine - Lower Aft  \nPylon Fairing Firewall","sortOrder":2},{"sectionNumber":"9/2009","sectionType":"part","heading":"9/2009","content":"## 9/2009","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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"This AD adopts the DGAC AD requirements for cracking of the lower aft pylon fairing firewall for the specified A330 models, retaining the original applicability (with stated exceptions), the 1,000 flight‑hour inspection interval, and termination path via Airbus SB A330‑54‑3022. The instrument does not expand or narrow the scope described in the referenced DGAC requirement."},"complexity_factors":["Cross-reference to foreign airworthiness directive (DGAC AD F-2004-028 R2) rather than full procedural text, requiring operators to consult another instrument (Requirement).","Multiple incorporations and exceptions: applicability excludes aircraft with Airbus mod 53623 or SB A330-54-3022 incorporated (Applicability).","Recurring inspection obligation at a defined interval (1,000 flight hours) with conditional termination once a service bulletin is incorporated (Compliance).","Required corrective actions are specified by the referenced DGAC AD rather than restated, creating dependency on external technical guidance (Requirement).","Safety-critical technical subject matter (firewall cracking) increases operational and regulatory scrutiny and potential downtime (Background).","Costs and operational disruption fall on operators and maintenance organisations who must schedule inspections and fund repairs (Compliance/Applicability).","Enforcement and effective date are set by CASA adopting the DGAC AD, leaving limited domestic discretion in the text (effective date/signature)."],"plain_english_summary":"Requires A330-223, -321, -322 and -323 aircraft with PW4000 engines to inspect the lower aft pylon fairing firewall every 1,000 flight hours and to carry out the repairs specified in DGAC AD F-2004-028 R2 if cracking is found; repetitive inspections end once Airbus Service Bulletin A330‑54‑3022 is incorporated. Operators (owners/maintenance organisations) pay for inspections and repairs; CASA enforces compliance by adopting the DGAC AD and referring operators to the Airbus service bulletins, changing routine maintenance scheduling and imposing a mandatory safety repair obligation."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with narrow, specific scope addressing a known safety defect in particular aircraft configurations. It has not expanded beyond its original purpose of mandating firewall inspections."},"complexity_factors":["Short, single-purpose directive (approximately 200 words of substantive content)","Only 4 specific aircraft models affected, with clear serial number exemptions","Single compliance action: visual inspection at fixed intervals","Cross-references to external documents (French DGAC AD and Airbus Service Bulletins) but does not reproduce their content","No nested conditional logic — simple 'if cracked, then repair' structure","No defined terms section; technical terms used are standard aviation nomenclature"],"plain_english_summary":"This CASA Airworthiness Directive mandates repeated 1,000-flight-hour inspections (and repairs if needed) of the lower aft pylon fairing firewall on Airbus A330-223/321/322/323 aircraft powered by Pratt & Whitney PW4000 engines, to address discovered cracking that could defeat engine-fire containment. It affects Australian operators and maintenance crews; inspections may be discontinued once Airbus’s specified service bulletin is embodied. Aircraft with AIRBUS mod 53623 or SB A330-54-3022 repairs are exempt."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a330-104-pw4000-engine-lower-aft-pylon-fairing-firewall","history":"/api/acts/ad-a330-104-pw4000-engine-lower-aft-pylon-fairing-firewall/history","analysis":"/api/acts/ad-a330-104-pw4000-engine-lower-aft-pylon-fairing-firewall/analysis","conflicts":"/api/acts/ad-a330-104-pw4000-engine-lower-aft-pylon-fairing-firewall/conflicts","importantCases":"/api/acts/ad-a330-104-pw4000-engine-lower-aft-pylon-fairing-firewall/important-cases","documents":"/api/acts/ad-a330-104-pw4000-engine-lower-aft-pylon-fairing-firewall/documents"}}