{"id":"F2006B02015","name":"AD/A330/42 - Integrated Standby Instrument System","slug":"ad-a330-42-integrated-standby-instrument-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41237,"registerId":"commonwealth-F2006B02015-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\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/A330/42 Integrated Standby Instrument","sectionType":"part","heading":"AD/A330/42 Integrated Standby Instrument System 13/2004","content":"# AD/A330/42 Integrated Standby Instrument System 13/2004\n\nTX\n\nApplicability: Airbus A330 aeroplanes, all serial numbers, fitted with:\n\n    \\- Integrated Standby Instruments System (ISIS) part number (P/N) C16221DB04 installed through Modification 47244 during production or Airbus Service Bulletin (SB) A330-34-3120 whilst in service, and not fitted with,\n\n    \\- Modification 52423 during production or Airbus SB A330-34-3141 whilst in service installing new ISIS standard P/N C16221WA01.\n\nRequirement: Perform a reset of ISIS according to the following procedure:\n\n    (i) Open the INST STBY circuit breaker on the 742VU panel (11FC, location D64) for more than 5 seconds, then close it.\n\n    (ii) After some seconds, the INIT page comes into view.\n\nCaution: Do not reset ISIS in flight.\n\nA complete electrical shut down of the aircraft is also sufficient to reset ISIS and is an alternative means to the above procedure.\n\nThe installation of ISIS Standard P/N C16221WA01 (Modification 52423 embodied during production or A330-34-3141 embodied whilst in service) cancels the need for applying the reset procedure defined above.\n\nNote: DGAC Emergency AD UF-2004-167 (EASA Approval 2004-10604) refers.\n\nCompliance: Within three calendar days after the effective date of this Directive, but not exceeding five calendar days from the last ISIS reset or aircraft complete power off, and thereafter at intervals not exceeding five calendar days until ISIS Standard P/N C16221WA01 is incorporated.\n\nThis Airworthiness Directive becomes effective on 22 October 2004.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD confines action to Airbus A330 aeroplanes fitted with ISIS P/N C16221DB04 and not fitted with the upgraded P/N C16221WA01. It imposes a short, recurring ground reset (or full power‑down) until the specified upgrade is embodied; this is consistent with addressing the identified unsafe condition without expanding to other equipment or aircraft types."},"complexity_factors":["Narrow applicability tied to ISIS part numbers and specific production/service modification paths (Applicability).","Precise procedural action required: open INST STBY circuit breaker on 742VU panel for more than five seconds, then close (Requirement).","Clear prohibition against performing the reset in flight, so action is restricted to ground operations (Caution).","Compliance timing constraints: initial action within three calendar days of the AD effective date but not exceeding five days from last reset or power‑off, and recurring at intervals not exceeding five days until upgrade (Compliance).","Recurring requirement is cancelled only when ISIS Standard P/N C16221WA01 is embodied by Modification 52423 or SB A330‑34‑3141, creating a one‑time upgrade pathway to remove the burden (Requirement).","Alternative means allowed (complete aircraft electrical shutdown) and cross‑reference to an external DGAC/EASA emergency AD (Note), which introduces coordination and verification steps."],"plain_english_summary":"Operators of Airbus A330 aircraft with the older Integrated Standby Instrument System (ISIS) must reset that system on the ground (by opening a specified circuit breaker for more than five seconds or by a full power‑down) at intervals not exceeding five days until the approved ISIS upgrade is fitted. CASA says this corrects an identified unsafe condition; aircraft operators bear the compliance cost, must schedule brief on‑ground downtime, and can remove the recurring task by installing the new ISIS part."},"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 is a discrete, targeted safety directive addressing a specific known hardware defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating interim corrective action until a permanent modification is made."},"complexity_factors":["Single specific technical requirement (reset procedure) with clear alternative method","Limited applicability criteria based on specific part numbers and modification/service bulletin references (4 conditions)","Straightforward compliance timeline with simple recurring interval (5 days)","No nested exceptions or conditional logic beyond the initial applicability test","Short document length (approximately 300 words)","Only one defined term used (ISIS - explained in context)","Clear termination condition (installation of upgraded part number)"],"plain_english_summary":"This Airworthiness Directive targets Airbus A330 aircraft fitted with a known-fault ISIS backup flight instrument (PN C16221DB04) and applies to operators who haven't yet upgraded to the newer ISIS (PN C16221WA01). \n\nIt requires operators to reset the ISIS regularly — via a power-down/reset procedure (never in flight) every five days, with an initial reset soon after the AD takes effect — until the unit is permanently replaced, to prevent loss of critical standby flight information."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a330-42-integrated-standby-instrument-system","history":"/api/acts/ad-a330-42-integrated-standby-instrument-system/history","analysis":"/api/acts/ad-a330-42-integrated-standby-instrument-system/analysis","conflicts":"/api/acts/ad-a330-42-integrated-standby-instrument-system/conflicts","importantCases":"/api/acts/ad-a330-42-integrated-standby-instrument-system/important-cases","documents":"/api/acts/ad-a330-42-integrated-standby-instrument-system/documents"}}