{"id":"F2006B03145","name":"AD/B747/248 - Oxygen Generators","slug":"ad-b747-248-oxygen-generators","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42517,"registerId":"commonwealth-F2006B03145-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 CAR 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\nBoeing 747 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B747/248 Oxygen Generators 7/2001 DM","sectionType":"part","heading":"AD/B747/248 Oxygen Generators 7/2001 DM","content":"# AD/B747/248 Oxygen Generators 7/2001 DM\n\nApplicability: Model 747 series aeroplanes, equipped with chemical oxygen generators, as listed in Boeing Special Attention Service Bulletin B747-35-2111 dated 1 March 2001.\n\nRequirement: 1. For airplanes having any chemical oxygen generator and/or passenger, attendant, or lavatory service unit assembly that contains a chemical oxygen generator that has been replaced, carry out a detailed visual inspection of the chemical oxygen generator of the applicable assembly to verify correct installation of the release pin in the generator firing mechanism in accordance with the Accomplishment Instructions of Service Bulletin (SB) B747-35-2111.\n\nNote 1: For the purposes of this Directive, a detailed visual inspection is defined as: \"An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.\"\n\nNote 2: The release pin and safety pin are located in the generator firing mechanism. The safety pin hole is the hole in the generator firing mechanism that is closest to the main body of the generator. The release pin hole is the hole in the generator firing mechanism located furthest from the main body of the generator. The centre axis of the release pin hole is perpendicular to the centre axis of the safety pin hole.\n\nNote 3: Inspections and corrective action carried out before the effective date of this Directive, per Boeing Telex M-7200-00-02474, dated 9, 13, 19, or 31October 2000; or Boeing Telex M-7200-00-03040, dated 18 December 2000; are considered acceptable for compliance with the initial inspection and corrective action specified in Requirement 1. However, prior accomplishment of the inspections and corrective action specified in the telexes does not eliminate the need for the inspection each time an oxygen generator is replaced.\n\n2. If any discrepancy is found during the Requirement 1 inspection carry out the corrective action per SB B747-35-2111.\n\nNote 4: FAA AD 2001-10-14 Amdt 39-12240 refers.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Scope is limited to Boeing 747 series aeroplanes equipped with chemical oxygen generators as listed in the referenced Boeing Service Bulletin. The Directive does not broaden applicability beyond those aircraft or components; it accepts certain prior telex compliance but still requires inspection whenever a generator is replaced."},"complexity_factors":["Technical specificity of the component and orientation to inspect (release pin vs safety pin) (Note 2)","Mandatory reliance on Boeing Special Attention Service Bulletin B747-35-2111 for inspection and corrective procedures (Requirement 1; Requirement 2)","Inspector judgment required by the defined ‘detailed visual inspection’ standard (Note 1) — lighting, aids and access may vary","Trigger condition tied to replacement events rather than a calendar interval, creating recurring compliance obligations (Requirement 1; Note 3)","Acceptance of prior Boeing telex inspections for initial compliance but retention of obligation on each replacement (Note 3)","Cross-reference to an FAA Airworthiness Directive (Note 4), adding inter-jurisdictional regulatory context"],"plain_english_summary":"Requires operators of Boeing 747 series aeroplanes fitted with chemical oxygen generators to perform a detailed visual inspection whenever a generator or a service unit containing one has been replaced, to verify the release pin in the firing mechanism is correctly installed, and to carry out corrective action per Boeing Service Bulletin if discrepancies are found. It affects aircraft operators, maintenance organisations and parts suppliers; operators bear inspection and repair costs and must follow the manufacturer’s instructions."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope: addressing a specific unsafe condition with chemical oxygen generators on Boeing 747 aircraft. The document references prior Boeing telexes and FAA directives, but these serve as alternative compliance pathways rather than scope expansion."},"complexity_factors":["Single, specific technical requirement focused on one aircraft type and one component","Only 2 main requirements with clear conditional logic (if discrepancy found → corrective action)","3 defined terms/clarifications in notes (detailed visual inspection, pin locations, prior compliance credit)","Heavy reliance on external Boeing documents (Service Bulletin B747-35-2111) for actual procedures","Cross-reference to FAA AD 2001-10-14 for context but not for compliance","No nested exceptions or complex temporal compliance structures"],"plain_english_summary":"This CASA safety order requires operators and maintenance organisations of Boeing 747s to perform a detailed visual inspection after any chemical oxygen generator (or its unit) is replaced to confirm the release pin in the firing mechanism is correctly installed. It’s aimed at preventing generator failure or unintended activation in emergencies following reports of incorrect installations."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-248-oxygen-generators","history":"/api/acts/ad-b747-248-oxygen-generators/history","analysis":"/api/acts/ad-b747-248-oxygen-generators/analysis","conflicts":"/api/acts/ad-b747-248-oxygen-generators/conflicts","importantCases":"/api/acts/ad-b747-248-oxygen-generators/important-cases","documents":"/api/acts/ad-b747-248-oxygen-generators/documents"}}