{"id":"F2006B01954","name":"AD/A320/66 - Improved Water Ingress Protection for Avionics 90VU and 91VU","slug":"ad-a320-66-improved-water-ingress-protection-for-avionics-90vu-and-91vu","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41176,"registerId":"commonwealth-F2006B01954-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A320/66 - Improved Water Ingress Protection for Avionics 90VU and 91VU","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 5/1996,Aircraft above 5700 kg,Airbus Industrie A319, A320 and A321 Series Aeroplanes,Improved Water Ingress Protection for Avionics 90VU and 91VU,66\ntitle: Airworthiness Directive - AD/A320/66 - Improved Water Ingress Protection for Avionics 90VU and 91VU\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Airbus Industrie A319, A320 and A321 Series Aeroplanes\n\n \n\nAD/A320/66 Improved Water Ingress Protection\n\nfor Avionics 90VU and 91VU\n\n\n5/96\n\n \n\nApplicability: All models A320 without Airbus Industrie modifications 21999 or 22119 embodied, or without Airbus Industrie SB A320-24-1054 incorporated.\n\n \n\nRequirement: Action in accordance with Airbus Industrie SB A320-24-1054.\n\n \n\nNote: DGAC AD 96-040-076 (B) refers.\n\n \n\nCompliance: Prior to 28 February 1999.\n\n \n\nThis Directive has effect from 25 April 1996.\n\n \n\nBackground:  This Directive is issued to improve the protection in the avionics compartment from accidental spillage of liquids in cabin or galley area.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a single specific purpose. It has not expanded beyond its original intent of mandating water ingress protection for specific avionics units on specific aircraft models."},"complexity_factors":["Very short document (under 200 words)","Only 2 defined applicability criteria (modification numbers)","Single straightforward requirement referencing an external technical standard","No nested conditions or exceptions","No cross-references to other legislation beyond a single note about a French aviation directive","Simple compliance deadline structure"],"plain_english_summary":"CASA issued an Airworthiness Directive requiring owners/operators of certain Airbus A319/A320/A321 aircraft that haven't incorporated mods 21999/22119 or Service Bulletin A320‑24‑1054 to install waterproofing around avionics units 90VU/91VU per the Airbus SB to prevent cabin/galley liquid ingress that could damage avionics and affect flight safety. Compliance was required by 28 Feb 1999; AD effective 25 Apr 1996."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive implements Airbus Service Bulletin A320-24-1054 for specified A320 family aeroplanes and excludes aircraft that already have modifications 21999 or 22119 or have incorporated the SB. It therefore stays within the original technical scope of improving avionics protection from cabin/galley liquid spillage (see Applicability and Requirement)."},"complexity_factors":["Applicability clarity: limited to \"All models A320 without Airbus Industrie modifications 21999 or 22119 embodied, or without Airbus Industrie SB A320-24-1054 incorporated.\" — operators must review modification records to determine applicability.","External-reference dependence: Requirement is to act \"in accordance with Airbus Industrie SB A320-24-1054.\" — operators must obtain and follow an external service bulletin (interpretation and parts/labour estimation rest on SB).","Compliance timing: \"Prior to 28 February 1999.\" and \"This Directive has effect from 25 April 1996.\" — introduces a fixed compliance window and an effectivity date to track.","Administrative burden: compliance requires maintenance planning and possible downtime to install protections in the avionics compartment, plus record-keeping to show SB incorporation.","Narrow technical scope: measure targets protection from liquid spillage into avionics (Background: \"improve the protection in the avionics compartment from accidental spillage of liquids in cabin or galley area.\"), limiting broader regulatory knock‑on effects.","Reference to foreign AD: Note states \"DGAC AD 96-040-076 (B) refers.\" — cross-jurisdictional coordination may affect compliance documentation for operators under multiple authorities."],"plain_english_summary":"This Airworthiness Directive requires Airbus A319/A320/A321 aeroplanes that have not already received Airbus modifications 21999 or 22119 (or incorporation of Airbus Service Bulletin A320-24-1054) to have improved water‑ingress protection fitted in the avionics compartment by following Airbus SB A320-24-1054. The stated purpose is to reduce the risk from accidental spillage in the cabin or galley reaching avionics. Compliance is mandated by the deadline stated in the Directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a320-66-improved-water-ingress-protection-for-avionics-90vu-and-91vu","history":"/api/acts/ad-a320-66-improved-water-ingress-protection-for-avionics-90vu-and-91vu/history","analysis":"/api/acts/ad-a320-66-improved-water-ingress-protection-for-avionics-90vu-and-91vu/analysis","conflicts":"/api/acts/ad-a320-66-improved-water-ingress-protection-for-avionics-90vu-and-91vu/conflicts","importantCases":"/api/acts/ad-a320-66-improved-water-ingress-protection-for-avionics-90vu-and-91vu/important-cases","documents":"/api/acts/ad-a320-66-improved-water-ingress-protection-for-avionics-90vu-and-91vu/documents"}}