{"id":"F2006B02008","name":"AD/A330/33 - Air Conditioning Pack Ram Air Outlet Ducts","slug":"ad-a330-33-air-conditioning-pack-ram-air-outlet-ducts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41230,"registerId":"commonwealth-F2006B02008-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nAirbus Industrie A330 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/A330/33 Air Conditioning Pack Ram Air","sectionType":"part","heading":"AD/A330/33 Air Conditioning Pack Ram Air Outlet Ducts 6/2004","content":"# AD/A330/33 Air Conditioning Pack Ram Air Outlet Ducts 6/2004\n\nApplicability: Model A330 aircraft, with serial numbers 0012, 0017, 0138, 0140, 0144, 0148, 0153,\n\n0155, 0162, and 0165.\n\nRequirement: Modify the ram air outlet ducts of the two air conditioning packs in accordance with Airbus Service Bulletin A330-53-3132 Revision 01.\n\nNote: DGAC AD F-2004-050 refers.\n\nCompliance: Before the accumulation of 12,000 flight cycles from the first flight.\n\nThis Airworthiness Directive becomes effective on 10 June 2004.\n\nBackground: The manufacturer has determined that the ram air outlet duct structure of the air conditioning packs may crack due to fatigue. Aircraft that had a reinforcement incorporated during production now require modification action, due to analyses of crack initiation around a threshold of 12,000 flight cycles.\n\n![](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 28 April 2004\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 19 May 2004.","sortOrder":1}],"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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The AD expands the set of aircraft requiring corrective action to include examples that previously had a production reinforcement. The Background states analyses showed crack initiation around 12,000 flight cycles even for reinforced aircraft, and the Applicability lists specific serial numbers now required to be modified. This moves the scope from only unreinforced units to include certain reinforced-production aircraft."},"complexity_factors":["Narrow applicability — specific A330 serial numbers listed (Applicability) which limits affected fleet but requires per‑aircraft tracking","Technical dependency on an external Airbus service bulletin for the required modification (Requirement: Airbus Service Bulletin A330‑53‑3132 Rev 01)","A single clear compliance metric tied to flight cycles (Compliance: before accumulation of 12,000 flight cycles) requiring operators to monitor cycles and schedule works","Safety rationale grounded in fatigue analysis (Background) — technical assessment drives timing and scope","Regulatory form is an AD under CASR subreg 39.1(1) (preamble) — creates mandatory legal obligation and enforcement discretion by CASA","Potential operational and maintenance burden: aircraft downtime, labour and parts to perform modification (implied by Requirement)","Cross‑reference to foreign authority AD (Note: DGAC AD F‑2004‑050) which may introduce harmonisation considerations"],"plain_english_summary":"Requires operators of the listed Airbus A330 serial numbers to modify the ram‑air outlet ducts on both air‑conditioning packs in accordance with Airbus Service Bulletin A330‑53‑3132 Rev 01, to be completed before the aircraft reaches 12,000 flight cycles (Requirement; Compliance). CASA issued the AD after fatigue analyses showed crack initiation near that threshold (Background). Operators must schedule and carry out the modification; the CASA delegate enforces the mandatory requirement."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical defect in a small fleet of aircraft. It maintains its original narrow scope — no expansion beyond the identified fatigue cracking issue in the ram air outlet ducts of the 10 specified A330 aircraft."},"complexity_factors":["Very short document (under 300 words)","Only 10 specific aircraft affected by serial number","Single, clear requirement with one referenced technical standard (Airbus Service Bulletin)","Simple compliance deadline (before 12,000 flight cycles)","No nested exceptions, conditional logic, or extensive cross-references","Only one defined term of note ('flight cycles' — implied as takeoff-landing cycles)"],"plain_english_summary":"This safety order directs the operators of ten specific Airbus A330 airframes to carry out a mandated modification to the ram air outlet ducts per Airbus Service Bulletin A330-53-3132. It targets aircraft prone to fatigue cracks that could impair the air‑conditioning system or other systems. Affected planes must be repaired before reaching 12,000 flight cycles."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a330-33-air-conditioning-pack-ram-air-outlet-ducts","history":"/api/acts/ad-a330-33-air-conditioning-pack-ram-air-outlet-ducts/history","analysis":"/api/acts/ad-a330-33-air-conditioning-pack-ram-air-outlet-ducts/analysis","conflicts":"/api/acts/ad-a330-33-air-conditioning-pack-ram-air-outlet-ducts/conflicts","importantCases":"/api/acts/ad-a330-33-air-conditioning-pack-ram-air-outlet-ducts/important-cases","documents":"/api/acts/ad-a330-33-air-conditioning-pack-ram-air-outlet-ducts/documents"}}