{"id":"F2006B02913","name":"AD/B737/216 - Flightcrew Oxygen Masks","slug":"ad-b737-216-flightcrew-oxygen-masks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42255,"registerId":"commonwealth-F2006B02913-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \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 CASR 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 737 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B737/216 Flightcrew Oxygen Masks 9/20","sectionType":"part","heading":"AD/B737/216 Flightcrew Oxygen Masks 9/2003","content":"# AD/B737/216 Flightcrew Oxygen Masks 9/2003\n\nApplicability: All Model 737-600, 737-700, 737-700C, 737-800, 737-900 series aeroplanes.\n\nRequirement: Revise the Non-Normal Procedures section of the Aircraft Flight Manual (AFM) by replacing the following text:\n\n''Rapid Depressurization (With airplane altitude above 14,000 feet M.S.L.).\n\nOxygen Masks & Regulators-ON, 100%'' With revised text as follows:\n\n\"Cabin Altitude Warning or Rapid Depressurization\n\nCondition: The cabin altitude warning horn sounds: Oxygen Masks & Regulators ON, 100%\"\n\nThe rest of the steps under this heading in the AFM are unchanged.\n\nThe foregoing may be accomplished by inserting a copy of this Directive into the appropriate section of the AFM.\n\nNote: FAA AD 2003-14-08 Amdt 39-13227 refers.\n\nCompliance: Within 90 days after the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 4 September 2003.\n\nBackground: This Directive requires the revision of the AFM to advise the flightcrew to don oxygen masks as a first and immediate step when a cabin altitude warning occurs. This action is necessary to prevent incapacitation of the flightcrew due to lack of oxygen, which could result in loss of control of the aeroplane.\n\n![Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nJim Coyne\n\n![](image.001.png)Delegate of the Civil Aviation Safety Authority 25 July 2003","sortOrder":1}],"analysis":{"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"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The Directive does not broaden applicability or add maintenance/modification obligations: it mandates a specific AFM wording change for the listed 737 models to make donning oxygen masks the immediate action on cabin altitude warning. It is an operational/documentation requirement rather than an expansion of scope (Applicability; Requirement; Note)."},"complexity_factors":["Narrow technical scope: applies only to listed Boeing 737 models (Applicability).","Single, textual AFM change rather than hardware modification — replacement of one set of Non‑Normal Procedures wording (Requirement).","Short, fixed compliance window of 90 days imposes an administrative deadline for operators to update manuals (Compliance).","Implementation is procedural (manual insertion and crew briefing/training) rather than engineering, so direct costs are mainly administrative and training time (Requirement; Background).","Regulatory basis under CASR subregulation 39.1(1) gives CASA delegate authority to issue the AD (header: 'under subregulation 39.1 (1) of CASR 1998').","Cross-reference to FAA AD 2003-14-08 may require operators to align with the FAA text or records (Note).","Enforcement/compliance monitoring risk: CASA expects operators to insert the Directive into the AFM and comply within the stated period; failure carries regulatory exposure (Requirement; Compliance; Background)."],"plain_english_summary":"Requires operators of Boeing 737-600/700/700C/800/900 series aeroplanes to revise the Aircraft Flight Manual Non‑Normal Procedures so that a cabin altitude warning horn directs flightcrew to put oxygen masks and regulators ON, 100% as the immediate action. The change is to be effected by inserting this Directive into the AFM within 90 days to reduce the risk of crew hypoxia and possible loss of control (Requirement; Applicability; Compliance; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope: requiring a specific flight manual amendment for specific Boeing 737 models. There is no evidence of scope creep — it does not expand to other aircraft types, introduce ongoing reporting requirements, or add maintenance procedures beyond the manual update."},"complexity_factors":["Single, specific aircraft type family (Boeing 737 NG series)","One clear action required: replace specific text in flight manual","No defined terms section — uses plain aviation terminology","No cross-references to other legislation (only a non-binding note about a related FAA directive)","Simple compliance deadline (90 days from effective date)","No exceptions, exemptions, or conditional logic","Short document (approximately 250 words of substantive text)"],"plain_english_summary":"This CASA Airworthiness Directive mandates that Australian operators of Boeing 737-600/700/700C/800/900 series revise their Aircraft Flight Manuals so pilots must don oxygen masks immediately when the cabin altitude warning horn sounds — not only after “rapid depressurization” above 14,000 ft. It tightens the trigger to prevent hypoxia-related incapacitation. Compliance was required within 90 days of 4 Sep 2003 (early Dec 2003)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-216-flightcrew-oxygen-masks","history":"/api/acts/ad-b737-216-flightcrew-oxygen-masks/history","analysis":"/api/acts/ad-b737-216-flightcrew-oxygen-masks/analysis","conflicts":"/api/acts/ad-b737-216-flightcrew-oxygen-masks/conflicts","importantCases":"/api/acts/ad-b737-216-flightcrew-oxygen-masks/important-cases","documents":"/api/acts/ad-b737-216-flightcrew-oxygen-masks/documents"}}