{"id":"F2008L00179","name":"AD/B747/369 - Passenger Oxygen Masks","slug":"ad-b747-369-passenger-oxygen-masks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":72367,"registerId":"commonwealth-F2008L00179-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"division","heading":"Boeing 747 Series Aeroplanes","content":"### Boeing 747 Series Aeroplanes\n\n| AD/B747/369 | Passenger Oxygen Masks | 2/2008 |\n| ----------- | ---------------------- | ------ |\n\n| Applicability: | Model 747-200B, 747-300 and 747-400 series aeroplanes, as identified in Boeing Service Bulletin (SB) 747-35-2119, dated 30 November 2006.                                                                                                                                                                                                                                                                                                     |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Carry out a general visual inspection in accordance with SB 747-35-2119 to determine the manufacturer and manufacture date of the oxygen masks in each of the oxygen boxes in the passenger service units of the outboard and centre main deck, the flight attendant service units, flightcrew rest, upper and lower module of the door 5 overhead crew rest, lavatory modules, together with miscellaneous ceiling panels, as applicable. |\n|                | 2. Following the Requirement 1 inspection carry out all the applicable related investigative and corrective actions by accomplishing all of the applicable actions specified in the Accomplishment Instructions of SB 747-35-2119, except where the service bulletin specifies replacing the oxygen mask assembly with a new oxygen mask assembly, replace it with a new or modified oxygen mask assembly having an improved flow indicator.  |\n|                | Note 1: SB 747-35-2119 refers to B/E Aerospace SB 174080-35-01, dated 6 February 2006, and Revision 1, dated 1 May 2006, as additional sources of service information for modifying the oxygen mask assembly by replacing the flow indicator with an improved flow indicator.                                                                                                                                                                 |\n|                | Later revisions of the above Boeing SB, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2007-26-06, are considered acceptable for compliance with the equivalent Requirements of this Directive.                                                                                                                                                                    |\n|                | Note 2: FAA AD 2007-26-06 Amdt 39-15308 refers.                                                                                                                                                                                                                                                                                                                                                                                               |\n| Compliance:    | For Requirement 1 - Within 60 months after the effective date of this Directive.                                                                                                                                                                                                                                                                                                                                                              |\n|                | For Requirement 2 - Before further flight after the Requirement 1 inspection.                                                                                                                                                                                                                                                                                                                                                                 |\n|                | This Airworthiness Directive becomes effective on 14 February 2008.                                                                                                                                                                                                                                                                                                                                                                           |\n\n| Background: | The FAA has received a report advising that several passenger masks with broken in-line flow indicators were found following a mask deployment. This Directive requires an inspection to determine manufacturer and manufacturer date of oxygen masks and, if necessary, related investigative/corrective actions. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n|             | The Directive is issued to prevent the in-line flow indicators of the passenger oxygen masks from fracturing and separating, which could inhibit oxygen flow to the masks and consequently result in exposure of the passengers and cabin attendants to hypoxia following a depressurisation event.                |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n20 December 2007","sortOrder":0},{"sectionNumber":"AD/B747/369","sectionType":"part","heading":"AD/B747/369","content":"## AD/B747/369","sortOrder":1},{"sectionNumber":"Passenger Oxygen Masks","sectionType":"part","heading":"Passenger Oxygen Masks","content":"## Passenger Oxygen Masks","sortOrder":2},{"sectionNumber":"2/2008","sectionType":"part","heading":"2/2008","content":"## 2/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive implements targeted inspections and corrective/replacement actions limited to the specified 747 models and the passenger oxygen mask assemblies identified in the referenced Boeing service bulletin. It aligns with the stated safety objective (preventing fractured in-line flow indicators that could inhibit oxygen flow) and does not expand scope beyond those aircraft, mask types, and the remedial measures described."},"complexity_factors":["Limited aircraft scope (specific 747-200B, -300 and -400 series) reduces breadth of impact.","Two-step compliance: an initial general visual inspection (within 60 months) then immediate corrective action where needed (before further flight).","Dependence on external service information: Boeing SB 747-35-2119 and B/E Aerospace SB referenced for accomplishment instructions and modification details.","Acceptability of later Boeing SB revisions only if FAA approves them as an AMOC, adding a regulatory cross-reference.","Operational burden concentrated on operators/owners: parts replacement logistics, scheduling out-of-service time, and recordkeeping.","Safety-critical timing pressure for corrective actions (must be done before next flight if defects found)."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Boeing 747-200B, 747-300 and 747-400 series aeroplanes (per Boeing SB 747-35-2119) to inspect passenger oxygen masks to identify manufacturer and manufacture date, then perform any related investigative or corrective actions — including replacing assemblies with masks fitted with an improved flow indicator where required. Inspections must be done within 60 months and corrective replacements completed before further flight. The aim is to prevent fractured flow indicators that could obstruct oxygen flow and cause hypoxia; operators pay for compliance and may use FAA‑approved alternative methods."},"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":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific safety defect identified by the FAA regarding oxygen mask flow indicators on specific Boeing 747 variants. There is no evidence of scope creep; the directive remains tightly focused on the original safety issue without expanding into unrelated aircraft systems or broader operational requirements."},"complexity_factors":["Single, specific technical subject matter (oxygen mask flow indicators)","Only 2 main requirements with clear sequential logic (inspect, then fix)","Limited applicability (3 specific Boeing 747 model series)","References external technical documents (Boeing Service Bulletin 747-35-2119 and B/E Aerospace SB) but provides clear compliance pathways","Simple compliance timeline (60 months for inspection, immediate for corrective action)","No nested exceptions or conditional logic — straightforward 'if found, then replace' structure","Short document (approximately 300 words of substantive content)"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of certain Boeing 747-200B/300/400 series to inspect all passenger oxygen masks within 60 months to identify manufacturer/date and to replace any with broken or faulty flow indicators immediately with an improved design. It responds to FAA findings that broken flow indicators can block oxygen flow during depressurisation, risking hypoxia for passengers and crew."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-369-passenger-oxygen-masks","history":"/api/acts/ad-b747-369-passenger-oxygen-masks/history","analysis":"/api/acts/ad-b747-369-passenger-oxygen-masks/analysis","conflicts":"/api/acts/ad-b747-369-passenger-oxygen-masks/conflicts","importantCases":"/api/acts/ad-b747-369-passenger-oxygen-masks/important-cases","documents":"/api/acts/ad-b747-369-passenger-oxygen-masks/documents"}}