{"id":"F2007L01062","name":"AD/AMD 50/41 - Oxygen - Incompatible Passenger Mask Boxes","slug":"ad-amd-50-41-oxygen-incompatible-passenger-mask-boxes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65024,"registerId":"commonwealth-F2007L01062-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AMD Falcon 50 and 900 Series Aeroplanes","sectionType":"division","heading":"AMD Falcon 50 and 900 Series Aeroplanes","content":"### AMD Falcon 50 and 900 Series Aeroplanes\n\n| AD/AMD 50/41 | Oxygen - IncompatiblePassenger Mask Boxes | 5/2007 |\n| ------------ | ----------------------------------------- | ------ |\n\n| Applicability: | Falcon 900EX aeroplanes serial numbers (S/N) 120 through 146 inclusive, that have not implemented Dassault Aviation Service Bulletin (SB) F900EX-257 dated 15 March 2006 or SB F900EX-257 Revision 1 dated 22 March 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Replace the passenger oxygen mask boxes in accordance with SB F900EX-257 or later revision approved by the European Aviation Safety Agency (EASA).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n|                | Note: EASA AD 2007-0073 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |\n| Compliance:    | No later than 30 June 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n|                | This Airworthiness Directive becomes effective on 10 May 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n| Background:    | On early Falcon aeroplanes featuring the EASy cockpit, a new electropneumatic oxygen (O2) controller was installed. An internal review by Dassault Aviation has determined that the passenger oxygen mask boxes are not compatible with this new controller. In OVERRIDE mode, when the internal pressure reducer is by-passed, O2 flow is nominal, while in NORMAL mode, O2 flow is reduced by half compared to what it should be.Consequently, in NORMAL mode, the minimum mass flow of supplemental O2 for each passenger, as required by Certification Specifications, is no longer met. This could lead to passengers’ incapacitation due to insufficient body oxygenation.This Directive mandates the replacement of the passenger oxygen mask boxes by new-design ones compatible with the controller. |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n28 March 2007","sortOrder":0},{"sectionNumber":"AD/AMD 50/41","sectionType":"part","heading":"AD/AMD 50/41","content":"## AD/AMD 50/41","sortOrder":1},{"sectionNumber":"Oxygen - IncompatiblePassenger Mask Boxe","sectionType":"part","heading":"Oxygen - IncompatiblePassenger Mask Boxes","content":"## Oxygen - Incompatible  \nPassenger Mask Boxes","sortOrder":2},{"sectionNumber":"5/2007","sectionType":"part","heading":"5/2007","content":"## 5/2007","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive addressing a specific technical defect in specific aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, specific applicability criterion (serial number range 120–146)","One clear compliance action (replace mask boxes per specified service bulletin)","Single deadline with no conditional extensions or exceptions","No defined terms section — uses plain technical language","No cross-references to other legislation (only notes related EASA AD for reference)","Background explanation is straightforward technical description of the fault"],"plain_english_summary":"This CASA Airworthiness Directive legally requires owners/operators of Dassault Falcon 900EX jets (serials 120–146) to replace passenger oxygen mask boxes incompatible with a newly installed oxygen controller. The incompatibility halves passenger oxygen flow in normal mode, risking incapacitation during depressurisation. Compliance (unless already done via Dassault service bulletins) was due by 30 June 2008."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope is confined to Falcon 900EX aeroplanes S/N 120–146 that have not implemented SB F900EX‑257 (Applicability). The directive corrects a specific incompatibility by requiring replacement of mask boxes per the manufacturer’s service bulletin (Requirement) by the stated deadline (Compliance). It does not expand applicability beyond the listed serial numbers and relies on EASA approval for any later SB revision (Note; Background)."},"complexity_factors":["Narrow technical fix tied to a specific subsystem: interaction between the new electropneumatic O2 controller and passenger mask boxes (Background).","Applicability restricted to a defined fleet by serial number, requiring operators to check aircraft records (Applicability).","Mandated incorporation of a manufacturer service bulletin and any later revision only if EASA‑approved, creating dependence on an external document and regulator approval (Requirement; Note).","Fixed compliance deadline and effective date create a time‑bound operational and logistical burden for affected operators (Compliance).","Safety‑critical performance standard referenced: minimum mass flow required by Certification Specifications not being met (Background).","Reference to an external EASA AD (EASA AD 2007‑0073) adds cross-jurisdictional regulatory linkage (Note).","Implementation cost and work: replacement of mask boxes is a direct expense and maintenance action for operators (Requirement/Compliance)."],"plain_english_summary":"Mandates replacement of passenger oxygen mask boxes on specified Falcon 900EX aeroplanes (S/N 120–146) that have not implemented Dassault Service Bulletin F900EX-257. The existing mask boxes are incompatible with a new electropneumatic oxygen controller and can reduce oxygen flow in NORMAL mode; replacement must follow SB F900EX-257 (or a later EASA‑approved revision) to restore required supplemental O2 flow. Compliance is required by 30 June 2008."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-amd-50-41-oxygen-incompatible-passenger-mask-boxes","history":"/api/acts/ad-amd-50-41-oxygen-incompatible-passenger-mask-boxes/history","analysis":"/api/acts/ad-amd-50-41-oxygen-incompatible-passenger-mask-boxes/analysis","conflicts":"/api/acts/ad-amd-50-41-oxygen-incompatible-passenger-mask-boxes/conflicts","importantCases":"/api/acts/ad-amd-50-41-oxygen-incompatible-passenger-mask-boxes/important-cases","documents":"/api/acts/ad-amd-50-41-oxygen-incompatible-passenger-mask-boxes/documents"}}