{"id":"F2006B02976","name":"AD/B737/75 - Passenger Oxygen System","slug":"ad-b737-75-passenger-oxygen-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42335,"registerId":"commonwealth-F2006B02976-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/75 - Passenger Oxygen System","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 737 Series Aeroplanes\n\nAD/B737/75 Passenger Oxygen System 3/93\n\nApplicability: Model 737 series airplanes listed in Boeing Alert Service Bulletins 737-35A1037 dated 13 February 1992 and 737-35A1038 dated 19 March 1992.\n\nRequirement: 1. For airplanes identified in Boeing Alert Service Bulletin 737-35A1037 dated 13 February 1992, modify the test stop plungers in the lavatory oxygen box\n\nassemblies in accordance with Boeing Alert Service Bulletin 737-35A1037 dated 13 February 1992.\n\n2. For airplanes identified in Boeing Alert Service Bulletin 737-35A1038 dated 19 March 1992, modify the modular lavatory “A” oxygen box assemblies in accordance with Boeing Alert Service Bulletin 737-35A1038 dated 19 March 1992.\n\nNote: FAA AD 92-25-04 Amendment 39-8419 refers.\n\nCompliance: Within 900 flight hours or six calendar months from the issue date of this Directive, whichever occurs later.\n\nBackground: This Directive is issued to correct a condition that may prevent the availability of oxygen to passengers during a loss of cabin pressure.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of ensuring passenger oxygen system functionality."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined applicability groups based on service bulletin references","Simple binary compliance structure (do X if in group A, do Y if in group B)","Single straightforward deadline calculation (900 hours OR 6 months)","No nested exceptions, cross-references to other legislation, or conditional logic beyond the basic applicability split","Technical content refers to external Boeing documents rather than defining terms within the directive itself"],"plain_english_summary":"This mandatory Airworthiness Directive requires operators of certain Boeing 737s (per two 1992 Boeing service bulletins) to replace or modify defective components in lavatory oxygen boxes so passenger oxygen will deploy if cabin pressure is lost. Affected owners must complete the work within 900 flight hours or six months. It fixes a potentially life‑threatening failure of the emergency oxygen system."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope is targeted and remains limited to the Boeing 737 series aircraft identified in the cited Boeing Alert Service Bulletins; the Directive prescribes specific component modifications within a set compliance window and does not expand applicability or create new regulatory powers beyond that requirement (Applicability, Requirement, Compliance)."},"complexity_factors":["Narrow, specific applicability to listed Boeing 737 models (Applicability).","Requires technical modifications to oxygen box components; work must follow external Boeing Alert Service Bulletins (Requirement).","Fixed compliance deadline tied to flight hours or calendar time creates operational scheduling constraints (Compliance).","Safety-critical nature increases consequence of non-compliance but leaves little regulatory discretion once applicable (Background, Requirement).","Implicit cost and logistics burden falls on aircraft operators who must source parts and schedule maintenance (Applicability, Requirement, Compliance)."],"plain_english_summary":"Requires operators of the Boeing 737 models listed in Boeing Alert Service Bulletins 737-35A1037 and 737-35A1038 to modify lavatory oxygen box components (test stop plungers or modular lavatory “A” oxygen boxes) per those bulletins (Requirement). Compliance is due within 900 flight hours or six months (Compliance). The Directive's stated purpose is to ensure passenger oxygen availability during loss of cabin pressure (Background). Operators must schedule and pay for the mandated maintenance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-75-passenger-oxygen-system","history":"/api/acts/ad-b737-75-passenger-oxygen-system/history","analysis":"/api/acts/ad-b737-75-passenger-oxygen-system/analysis","conflicts":"/api/acts/ad-b737-75-passenger-oxygen-system/conflicts","importantCases":"/api/acts/ad-b737-75-passenger-oxygen-system/important-cases","documents":"/api/acts/ad-b737-75-passenger-oxygen-system/documents"}}