{"id":"F2006B09518","name":"AD/EMB-120/31 Amdt 2 - Flight Attendant Oxygen","slug":"ad-emb-120-31-amdt-2-flight-attendant-oxygen","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54100,"registerId":"commonwealth-F2006B09518-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-120/31 Amdt 2 - Flight Attendant Oxygen","content":"![](image.001.png)\n\n![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive AD/EMB-120/31 Amdt 1 and issues the following 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\nEmbraer EMB-120 (Brasilia) Series Aeroplanes\n\nAD/EMB-120/31\n\nAmdt 2\n\n  \nFlight Attendant Oxygen 11/2002\n\nApplicability: All EMB-120( ) models equipped with a lavatory installed in the forward part of the passenger cabin.\n\nRequirement: If not previously accomplished in accordance with Amendment 1 of this Directive, establish a new maximum altitude operating limitation by amending the Aircraft Flight Manual (AFM) Limitations Section as follows:\n\n“Maximum operating altitude is limited to 25,000 ft unless the right hand front row aisle passenger seat is reserved for flight attendant use during operation above 25 000 ft.”\n\nor alternately,\n\nInstall an oxygen dispensing unit, with an oxygen mask permanently attached, under the fight attendant seat, in accordance with the detailed instructions and procedures of Embraer Service Bulletin No. 120-25-0264 Revision 1 dated 22 July 2002 and establish the following operational limitation by amending the AFM Limitations Section as follows:\n\n“Maximum operating altitude with SB 120-25-0264 Revision 1 incorporated is limited to 30 000 ft, unless the RH front row aisle passenger seat is reserved for flight attendant use during operation above 30 000 ft.”\n\nCompliance with either of the above alternate operational limitations may be achieved by inclusion of a copy this Directive in the applicable AFM.\n\nNote: DAC (Brazil) AD 2001-11-03 R1 refers.\n\nCompliance: Remains unchanged as “Within 10 hours time in service after the effective date of Amendment 1 of this Directive”.\n\nThis Amendment becomes effective on 31 October 2002.\n\nEmbraer EMB-120 (Brasilia) Series Aeroplanes\n\nAD/EMB-120/31 Amdt 2 (continued)\n\nBackground: The Departamento de Aviação Civil - DAC of Brazil has determined that the installation of the forward lavatory caused the relocation of the most forward oxygen dispensing unit and masks (installed at the ceiling or at the wardrobe wall in front of the first double seat) dedicated to the RH front row passengers seats and flight attendant. The seated flight attendant cannot reach oxygen masks located at the next rearward position, when automatically deployed in case of cabin decompression.\n\nAdditionally, the portable oxygen dispensing unit and mask installed in the compartment on the external side of the lavatory rear wall, although located within easy reach of the flight attendant, is not immediately available to him (or her).\n\nThe original issue of this Directive required revision of the AFM introducing maximum altitude operating limitations.\n\nAmendment 1 followed the issue of an Erratum to AD 2001-11-03 by DAC - Brazil. The Erratum revised the AFM Limitation by changing the seating arrangement for the flight attendant from the front RH outboard seat to the front RH aisle seat during operations above 25,000 ft.\n\nThis Amendment introduces an optional installation of an oxygen bottle and mask under the flight attendant’s seat together with an alternate operational limitation.\n\nThe original issue of this Airworthiness Directive became effective on 19 December 2001.\n\nAmendment 1 became effective on 22 January 2002.\n\n![Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 13 September 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 9 October 2002.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 2 expands compliance options compared with the original AD/ Amendment 1. The original requirement introduced AFM altitude limits; Amendment 2 adds an optional equipment installation (under‑seat oxygen dispensing unit per Embraer SB) that, if installed, raises the permitted maximum operating altitude from 25,000 ft to 30,000 ft (subject to AFM amendment). It also revokes Amendment 1 and retains the original 10‑hour compliance timing."},"complexity_factors":["Technical specificity: prescribes a physical modification (oxygen dispensing unit) to aircraft equipment tied to a manufacturer Service Bulletin (SB 120-25-0264 Rev 1).","Alternative compliance paths: operators may choose an AFM limitation or a hardware installation to meet the AD.","AFM amendment requirement: changes must be recorded in the Aircraft Flight Manual (administrative compliance burden).","Regulatory linkage: revokes Amendment 1 and cross-references DAC (Brazil) AD and prior Erratum, creating interdependence between instruments.","Operational constraint: introduces absolute altitude limits (25,000 ft or 30,000 ft) conditional on seating/installation arrangements.","Short compliance window reference: compliance is tied to the effective date of a prior amendment (remains “within 10 hours time in service after the effective date of Amendment 1”), complicating timing for operators.","Applicability narrowness: applies only to EMB-120 models with a forward lavatory, requiring fleet-specific assessment by operators."],"plain_english_summary":"This AD requires operators of Embraer EMB-120 aeroplanes with a forward lavatory to either limit maximum operating altitude (25,000 ft) unless the right‑hand front‑row aisle seat is reserved for a flight attendant, or install an oxygen dispensing unit beneath the flight‑attendant seat per Embraer Service Bulletin 120‑25‑0264 Rev 1 and then limit altitude to 30,000 ft. The change must be recorded in the Aircraft Flight Manual; compliance was required within 10 hours after Amendment 1. It addresses access to oxygen masks following the forward lavatory installation."},"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":3,"scope_assessment":{"changed":false,"description":"This Amendment 2 remains tightly focused on the original safety issue: ensuring flight attendant oxygen accessibility on EMB-120 aircraft with forward lavatories. It introduces an optional technical solution (installing oxygen equipment under the seat) alongside the existing operational limitation, but this is a refinement rather than scope expansion. The core purpose—addressing the oxygen accessibility hazard created by the lavatory installation—remains unchanged from the original December 2001 directive."},"complexity_factors":["Single, clearly defined applicability (specific aircraft model with specific configuration)","Two alternative compliance paths with clear, mutually exclusive requirements","Minimal cross-referencing (only references one Brazilian aviation authority directive and one manufacturer service bulletin)","Short document (approximately 400 words) with straightforward conditional logic","Only one defined term used (AFM - Aircraft Flight Manual, which is explained in context)","Compliance deadline refers back to previous amendment rather than restating"],"plain_english_summary":"This CASA Airworthiness Directive for Embraer EMB‑120 Brasilia aircraft with a forward lavatory fixes a safety gap: the lavatory relocation moved the flight attendant’s and nearby passenger oxygen masks out of reach in a decompression. Operators must either limit cruise to 25,000 ft (unless the flight attendant occupies the right‑front aisle passenger seat) or install a dedicated under‑seat oxygen bottle/mask per Embraer service instructions, allowing operation up to 30,000 ft. The goal is immediate oxygen access for crew to prevent hypoxia in emergencies."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-120-31-amdt-2-flight-attendant-oxygen","history":"/api/acts/ad-emb-120-31-amdt-2-flight-attendant-oxygen/history","analysis":"/api/acts/ad-emb-120-31-amdt-2-flight-attendant-oxygen/analysis","conflicts":"/api/acts/ad-emb-120-31-amdt-2-flight-attendant-oxygen/conflicts","importantCases":"/api/acts/ad-emb-120-31-amdt-2-flight-attendant-oxygen/important-cases","documents":"/api/acts/ad-emb-120-31-amdt-2-flight-attendant-oxygen/documents"}}