{"id":"F2008L00539","name":"AD/A320/211 - Stand-By Instruments - Emergency Lighting","slug":"ad-a320-211-stand-by-instruments-emergency-lighting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119437,"registerId":"commonwealth-F2008L00539-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Airbus Industrie A319, A320 and A321 Ser","sectionType":"division","heading":"Airbus Industrie A319, A320 and A321 Series Aeroplanes","content":"### Airbus Industrie A319, A320 and A321 Series Aeroplanes\n\n| AD/A320/211 | Stand-By Instruments - Emergency Lighting | 3/2008 |\n| ----------- | ----------------------------------------- | ------ |\n\n| Applicability: | A318, A319, A320 and A321 series aeroplanes, all serial numbers, fitted with classical standby instruments installed by Airbus modification 20011 or 21999 during production or by Airbus Service Bulletin (SB) A320-34-1280 whilst in service except:                                                                                                                                                                                                                                                                            |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|                | a. aircraft fitted with Integrated Standby Instrument System (ISIS) equipment installed by Airbus modification 27620 during production, or by Airbus SB A320-34-1261 or SB A320-34-1372 whilst in service, or                                                                                                                                                                                                                                                                                                                     |\n|                | b. aircraft having received Airbus modification 37329 or 37330 during production or by Airbus SB A320-33-1057 whilst in service.                                                                                                                                                                                                                                                                                                                                                                                                  |\n| Requirement:   | Unless already accomplished, modify the electrical supply logic of the under glare shield flood lighting in accordance with the instructions in SB A320-33-1057 or later EASA approved revision.                                                                                                                                                                                                                                                                                                                                  |\n|                | Note: EASA AD 2007-0286 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n| Compliance:    | No later than 27 May 2011.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n|                | This Airworthiness Directive becomes effective on 13 March 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n| Background:    | The European Aviation Safety Agency (EASA) has advised that some operators have reported occurrences of loss of the AC BUS 1 with subsequent loss of the AC ESS BUS and DC ESS BUS resulting in the loss of five upper Display Units and the loss of integral lighting. In this situation flight crew have reported concerns in reading the standby instruments when the DOME lights were selected to OFF.This situation, if not corrected, could increase the workload of the flight crew which constitutes an unsafe condition. |\n\n|     | This Directive mandates the modification of the electrical supply logic by adding a back-up supply on the battery hot bus for the under glare shield flood lighting. |\n| --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n23 January 2008","sortOrder":0},{"sectionNumber":"AD/A320/211","sectionType":"part","heading":"AD/A320/211","content":"## AD/A320/211","sortOrder":1},{"sectionNumber":"Stand-By Instruments - Emergency Lightin","sectionType":"part","heading":"Stand-By Instruments - Emergency Lighting","content":"## Stand-By Instruments - Emergency Lighting","sortOrder":2},{"sectionNumber":"3/2008","sectionType":"part","heading":"3/2008","content":"## 3/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD implements a targeted corrective modification to address the unsafe condition described (loss of standby lighting following certain bus failures). It does not expand applicability beyond specified configurations or add unrelated obligations; it prescribes a single engineering remedy via the referenced service bulletin and a compliance deadline."},"complexity_factors":["Applicability requires tracking airframe configurations and exclusions (Applicability): some aircraft with ISIS or mods 37329/37330 are exempt, increasing administrative filtering.","Technical change affects electrical supply logic to add a battery hot‑bus back‑up for under glare‑shield flood lighting (Requirement/Background), requiring certified maintenance action.","Mandated action must follow a specific Airbus Service Bulletin (SB A320‑33‑1057) or a later EASA‑approved revision (Requirement/Note), so operators depend on that SB's instructions and approval status.","Fixed compliance date imposes scheduling across fleets (Compliance), creating logistical downtime and resource allocation burdens for operators.","Regulatory cross‑references to EASA AD 2007‑0286 and CASA enforcement mean international/agency coordination for acceptable revisions and approvals (Note/Background).","Costs and execution responsibility fall to operators (Requirement/Compliance), creating a direct commercial incentive to prioritise or delay depending on operational impact."],"plain_english_summary":"This Airworthiness Directive requires operators of Airbus A318–A321 aeroplanes fitted with classical standby instruments to modify the under‑glare‑shield flood lighting electrical supply so a battery‑hot bus provides a back‑up feed, following Airbus SB A320‑33‑1057 (or a later EASA‑approved revision). CASA requires the work be done by 27 May 2011.\n\nEASA states the change prevents loss of standby-instrument lighting after an AC BUS 1 failure that can affect AC ESS and DC ESS BUSES. Operators pay for and schedule the approved modification and must record compliance under the AD."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific electrical failure mode in specific aircraft configurations. The scope remains precisely limited to the identified unsafe condition regarding standby instrument lighting during electrical system failures."},"complexity_factors":["Highly specific technical applicability criteria referencing multiple Airbus modification numbers (20011, 21999, 27620, 37329, 37330) and Service Bulletins","Nested exceptions structure (applies to X except Y except Z)","Requires cross-referencing to external technical documents (Airbus SB A320-33-1057, EASA AD 2007-0286)","Technical aviation terminology throughout (AC BUS, DC ESS BUS, ISIS, battery hot bus, glare shield flood lighting)","However: Single clear requirement, single compliance deadline, and relatively short document length keep complexity moderate"],"plain_english_summary":"This AD requires owners/operators of certain Airbus A318/A319/A320/A321 aircraft (with classical standby instruments and not already modified) to install wiring per Airbus Service Bulletin A320‑33‑1057 so the floodlights above the instrument panel get battery backup. It ensures pilots can read standby instruments if AC BUS 1 and dome lighting fail. Compliance deadline: 27 May 2011."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a320-211-stand-by-instruments-emergency-lighting","history":"/api/acts/ad-a320-211-stand-by-instruments-emergency-lighting/history","analysis":"/api/acts/ad-a320-211-stand-by-instruments-emergency-lighting/analysis","conflicts":"/api/acts/ad-a320-211-stand-by-instruments-emergency-lighting/conflicts","importantCases":"/api/acts/ad-a320-211-stand-by-instruments-emergency-lighting/important-cases","documents":"/api/acts/ad-a320-211-stand-by-instruments-emergency-lighting/documents"}}