{"id":"F2006B11423","name":"AD/OXY/12 - PELS Model 4566M37B Crewmember Protective Breathing Equipment","slug":"ad-oxy-12-pels-model-4566m37b-crewmember-protective-breathing-equipment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57343,"registerId":"commonwealth-F2006B11423-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/OXY/12 - PELS Model 4566M37B Crewmember Protective Breathing Equipment","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Oxygen Systems\n\n \n\n# AD/OXY/12 PELS Model 4566M37B Crewmember\n\nProtective Breathing Equipment\n\nApplicability: Essex PB&R Corporation (formerly E.I. Du Pont de Nemours and Company Incorporated) PELS® model 4566M37B crewmember Protective Breathing\n\n# 11/93\n\nEquipment (PBE) units, serial numbers as listed in Essex PB&R Corporation Service Bulletin 001 Revision 1 dated 3 October 1991, manufactured between 29 March 1989 and 9 May 1989. The PBE units may be installed on but not limited to transport category aircraft manufactured by Boeing, McDonnell Douglas, Airbus and Lockheed.\n\n \n\nRequirement: Remove from service, in accordance with Essex PB&R Corporation Service Bulletin 001 Revision 1 dated 3 October 1991.\n\n \n\nNote: FAA AD 93-14-12 Amendment 39-8636 refers.\n\n \n\nCompliance: Prior to 31 December 1994.\n\n \n\nBackground: The manufacturer has advised the FAA that certain PBE units contain a potentially defective adhesive bond between the hood shell and neck seal which could compromise user protection.\n\n \n\nCompliance with this Directive alleviates the possibility of crewmembers being unable to combat an aircraft fire due to leakage of the PBE neck seal.\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\n \n\n \n","sortOrder":0}],"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, targeted safety directive addressing a specific manufacturing defect in specific units. It has not expanded beyond its original purpose of grounding defective breathing equipment."},"complexity_factors":["Single, unambiguous requirement: remove specific equipment","Only 4 defined elements: manufacturer, model, serial number range, and date range","No nested conditions or exceptions","No cross-references to other legislation (only a non-binding note about a related US FAA directive)","Clear compliance deadline with no alternative methods","Total length: approximately 150 words of substantive content"],"plain_english_summary":"This CASA Airworthiness Directive orders the mandatory removal from service of certain Essex PB&R emergency breathing masks because a glue defect can let toxic smoke enter the hood. It affects aircraft operators and maintenance crews who have the listed PBE units (manufactured 29 Mar–9 May 1989). Compliance is required before 31 Dec 1994 to ensure crew can safely fight fires and protect passengers."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive maintains the original narrow remedial scope: remove specified defective PBE units identified by the manufacturer and FAA. It does not expand to other models, broader inspections, or ongoing maintenance requirements beyond the stated removal instruction."},"complexity_factors":["Narrow, equipment-specific scope limited to model 4566M37B and serial numbers listed in an external service bulletin.","Obligation to identify and remove affected units across multiple operators and aircraft types (Boeing, McDonnell Douglas, Airbus, Lockheed), creating tracing and logistics work.","Fixed compliance deadline (prior to 31 December 1994) requiring timely inventory checks and action.","Dependence on an external document (Essex Service Bulletin 001 Rev 1) to define affected serial numbers and removal instructions.","Operational impact from loss of installed PBEs until replacement is arranged, affecting safety-equipment inventories and supply chains.","Regulatory enforcement relies on CASA/inspector discretion to verify compliance and may require record-keeping and proof of removal."],"plain_english_summary":"Mechanically, this Airworthiness Directive requires operators to remove from service specific Essex PELS model 4566M37B crewmember Protective Breathing Equipment units (serial numbers listed in Essex Service Bulletin 001 Revision 1) by 31 December 1994. CASA issues the directive; aircraft operators must trace affected units across their fleets and bear the cost and logistics of removal and replacement.\n\nThe manufacturer advised the FAA that some units may have a defective adhesive bond between the hood shell and neck seal that could cause leakage and reduce protection; removing the listed units is intended to eliminate that risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-oxy-12-pels-model-4566m37b-crewmember-protective-breathing-equipment","history":"/api/acts/ad-oxy-12-pels-model-4566m37b-crewmember-protective-breathing-equipment/history","analysis":"/api/acts/ad-oxy-12-pels-model-4566m37b-crewmember-protective-breathing-equipment/analysis","conflicts":"/api/acts/ad-oxy-12-pels-model-4566m37b-crewmember-protective-breathing-equipment/conflicts","importantCases":"/api/acts/ad-oxy-12-pels-model-4566m37b-crewmember-protective-breathing-equipment/important-cases","documents":"/api/acts/ad-oxy-12-pels-model-4566m37b-crewmember-protective-breathing-equipment/documents"}}