{"id":"F2006B02905","name":"AD/B737/208 - Oxygen Masks","slug":"ad-b737-208-oxygen-masks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42247,"registerId":"commonwealth-F2006B02905-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)![](image.001.png)AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)For 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\nBoeing 737 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B737/208 Oxygen Masks 3/2003","sectionType":"part","heading":"AD/B737/208 Oxygen Masks 3/2003","content":"# AD/B737/208 Oxygen Masks 3/2003\n\nApplicability: Model 737-300, \\-400 and \\-500 series aeroplanes.\n\nRequirement: Revise the procedures regarding donning oxygen masks in the event of rapid depressurisation, as contained in the Emergency Procedures section of the Aircraft Flight Manual (AFM), as follows:\n\nDelete: \\-\n\n''RAPID DEPRESSURISATION (With aeroplane altitude above 14,000 feet MSL.)\n\nRECALL\n\nOxygen Masks & Regulators—ON, 100%'' Insert: -\n\n\"CABIN ALTITUDE WARNING OR RAPID DEPRESSURISATION\n\nIf the cabin altitude warning horn sounds:\n\nRECALL\n\nOxygen Masks & Regulators—ON, 100%\"\n\nThe rest of the steps under this heading in the AFM are unchanged.\n\nThe AFM revision may be accomplished by inserting a copy of the Directive into the relevant section of the AFM.\n\nNote: FAA AD 2003-03-15 Amdt 39-13039 refers.\n\nCompliance: Before 20 June 2003.\n\nThis Airworthiness Directive becomes effective on 20 March 2003.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope: a targeted safety fix for specific Boeing 737 models. The amendment does not expand beyond correcting an unsafe condition in oxygen mask procedures."},"complexity_factors":["Single, specific aircraft type and model range (737-300/400/500)","Only one substantive change: replacing a trigger condition in flight manual procedures","No defined terms section — uses standard aviation terminology","No cross-references to other legislation (only a note about related FAA directive)","Simple compliance mechanism (insert copy of directive into manual)","Clear, fixed deadline with no conditional timing"],"plain_english_summary":"This safety order for Boeing 737-300/-400/-500 aircraft requires operators to revise flight manuals so pilots must don oxygen masks whenever the cabin altitude warning horn sounds, rather than only during “rapid depressurisation” above 14,000 ft. \n\nIt closes a gap where pressure loss might not meet the old definition but still be hazardous. Affected operators must insert this directive into their manuals by 20 June 2003."},"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"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The Directive broadens the trigger for donning oxygen masks from ‘rapid depressurisation with aeroplane altitude above 14,000 feet MSL’ to any instance where the cabin altitude warning horn sounds. It keeps the same aircraft models and requires AFM revision, thus expanding when crews must take the action while leaving affected fleet scope unchanged."},"complexity_factors":["Narrow applicability: limited to Boeing 737-300, -400 and -500 series (straightforward affected population).","Single, textual change to AFM emergency procedure (low legal and technical complexity).","Compliance method simple: insert the Directive into the AFM (minimal paperwork and no engineering modification).","Short compliance timeline requiring operator administrative action by a fixed date (logistics/scheduling factor).","Operational effect limited to crew behaviour (donning masks on cabin altitude warning), requiring training/briefing but no hardware change.","Cross-reference to FAA AD 2003-03-15 (regulatory alignment consideration)."],"plain_english_summary":"Rewrites the Emergency Procedures in the Boeing 737-300/ -400/ -500 Aircraft Flight Manual so crew must set oxygen masks and regulators to ON, 100% when the cabin altitude warning horn sounds, instead of only after rapid depressurisation above 14,000 ft. Operators must insert this directive into the AFM by 20 June 2003. This affects aircraft operators and flight crews by replacing an altitude-limited trigger with a cockpit-warning–triggered action and imposes a short administrative compliance task plus a crew-procedure change."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-208-oxygen-masks","history":"/api/acts/ad-b737-208-oxygen-masks/history","analysis":"/api/acts/ad-b737-208-oxygen-masks/analysis","conflicts":"/api/acts/ad-b737-208-oxygen-masks/conflicts","importantCases":"/api/acts/ad-b737-208-oxygen-masks/important-cases","documents":"/api/acts/ad-b737-208-oxygen-masks/documents"}}