{"id":"F2006B02707","name":"AD/B727/183 - Oxygen Masks","slug":"ad-b727-183-oxygen-masks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42023,"registerId":"commonwealth-F2006B02707-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 727 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B727/183 Oxygen Masks 3/2003","sectionType":"part","heading":"AD/B727/183 Oxygen Masks 3/2003","content":"# AD/B727/183 Oxygen Masks 3/2003\n\nApplicability: Model 727 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\n\nOxygen Masks & Regulators—ON, 100% ALL'' Insert: -\n\n\"CABIN ALTITUDE WARNING OR RAPID DEPRESSURISATION\n\nIf the cabin altitude warning horn sounds:\n\nOxygen Masks & Regulators—ON, 100%, ALL\"\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":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — a specific safety update for oxygen mask procedures on one aircraft type. No scope creep detected."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term (AFM — Aircraft Flight Manual)","Single, straightforward requirement with clear substitution instructions","No cross-references to other legislation (only a note about related FAA directive)","Simple compliance mechanism (insert page or rewrite manual)","Single applicability criterion (Model 727 series aeroplanes)"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of Boeing 727 aircraft in Australia to change emergency procedures so pilots don oxygen masks when the cabin altitude warning horn sounds (instead of waiting for “rapid depressurisation”). It’s a proactive safety measure to guard against hypoxia and buy time for descent. Compliance is by updating or inserting the change into the Aircraft Flight Manual; required by 20 June 2003."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The Directive does not expand scope beyond the original applicability. It clarifies AFM procedures for Model 727 aeroplanes only, requires a textual AFM revision, and sets a compliance deadline; no new aircraft types, systems, or ongoing obligations are added (see Applicability and Requirement)."},"complexity_factors":["Single, limited textual change to AFM emergency procedures (Requirement)","Narrow applicability: only Model 727 series aeroplanes (Applicability)","Compliance can be effected by inserting the Directive into the AFM (Requirement)","Fixed compliance and effective dates reduce regulatory uncertainty (Compliance)","No hardware modification, inspection, or recurrent action required (Requirement)","Cross-reference to FAA AD (Note) but no additional procedural layers in this instrument"],"plain_english_summary":"This Airworthiness Directive requires Boeing 727 operators to amend the Aircraft Flight Manual emergency procedure wording: replace the ‘Rapid Depressurisation’ donning instruction with a ‘CABIN ALTITUDE WARNING OR RAPID DEPRESSURISATION’ instruction and specify “Oxygen Masks & Regulators—ON, 100%, ALL.”\n\nIt applies to all Model 727 aeroplanes, ties mask donning to the cabin altitude warning horn, may be complied with by inserting the Directive into the AFM, and must be done by 20 June 2003."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-183-oxygen-masks","history":"/api/acts/ad-b727-183-oxygen-masks/history","analysis":"/api/acts/ad-b727-183-oxygen-masks/analysis","conflicts":"/api/acts/ad-b727-183-oxygen-masks/conflicts","importantCases":"/api/acts/ad-b727-183-oxygen-masks/important-cases","documents":"/api/acts/ad-b727-183-oxygen-masks/documents"}}