{"id":"F2007L01060","name":"AD/B737/302 - Passenger Service Unit Chemical Oxygen Generators","slug":"ad-b737-302-passenger-service-unit-chemical-oxygen-generators","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65018,"registerId":"commonwealth-F2007L01060-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 737 Series Aeroplanes","sectionType":"division","heading":"Boeing 737 Series Aeroplanes","content":"### Boeing 737 Series Aeroplanes\n\n| AD/B737/302 | Passenger Service UnitChemical Oxygen Generators | 5/2007 |\n| ----------- | ------------------------------------------------ | ------ |\n\n| Applicability: | Model 737-300, -400, -500, -600, -700, -800 and -900 series aeroplanes, as identified in either Boeing Special Attention Service Bulletins (SB) 737-25-1545 Revision 1 dated 30 November 2006 or 737-25-1548 dated 22 November 2005.                                                                                            |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | If not previously accomplished, modify the activation mechanism in the chemical oxygen generator of each passenger service unit (PSU) in accordance with the Accomplishment Instructions of SB 737-25-1545 Revision 1 or 737-25-1548, as applicable.                                                                            |\n|                | Modifications accomplished before the effective date of this Directive in accordance with SB 737-25-1545 original issue dated 8 September 2005, are acceptable for compliance with this Directive.                                                                                                                              |\n|                | Later revisions of the above SB(s), approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2007-07-02, are considered acceptable for compliance with the equivalent Requirements of this Directive.                                                          |\n|                | Note: FAA AD 2007-07-02 Amdt 39-15002 refers.                                                                                                                                                                                                                                                                                   |\n| Compliance:    | Within 60 months after the effective date of this Directive.                                                                                                                                                                                                                                                                    |\n|                | This Airworthiness Directive becomes effective on 10 May 2007.                                                                                                                                                                                                                                                                  |\n| Background:    | The United States Federal Aviation Administration (FAA) has received several reports indicating that some chemical oxygen generators failed to activate during in-flight decompression events. These failures were due to fracture of components between the passenger oxygen mask and the release pin in the oxygen generator. |\n\n|     | This Directive requires the modification of the activation mechanism in the chemical oxygen generator of each PSU and is issued to prevent failure of the activation mechanism, which could result in the unavailability of supplemental oxygen and possible incapacitation of passengers and cabin crew during an in-flight decompression. |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n30 March 2007","sortOrder":0},{"sectionNumber":"AD/B737/302","sectionType":"part","heading":"AD/B737/302","content":"## AD/B737/302","sortOrder":1},{"sectionNumber":"Passenger Service UnitChemical Oxygen Ge","sectionType":"part","heading":"Passenger Service UnitChemical Oxygen Generators","content":"## Passenger Service Unit  \nChemical Oxygen Generators","sortOrder":2},{"sectionNumber":"5/2007","sectionType":"part","heading":"5/2007","content":"## 5/2007","sortOrder":3}],"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":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: mandating a specific safety modification to oxygen generator activation mechanisms on specific Boeing 737 models. There is no evidence of scope creep; it addresses exactly the safety defect described in the background (fracturing activation components) with precisely targeted applicability."},"complexity_factors":["Short, single-purpose directive focused on one specific mechanical modification","Only 2 applicable Service Bulletins referenced, with clear hierarchy (Revision 1 vs original issue)","Single compliance timeframe (60 months) with one effective date","Limited applicability: specific Boeing 737 model series only","Contains one conditional pathway for previously completed work (grandfathering clause for modifications done before effective date)","References external FAA AD for alternate compliance methods, creating minor cross-jurisdictional complexity","No nested definitions or interpretation sections — technical terms (PSU, AMOC) are industry standard or explained in context"],"plain_english_summary":"This CASA Airworthiness Directive mandates a repair to the passenger service unit emergency oxygen systems on affected Boeing 737s (‑300 through ‑900 series). Operators who haven’t completed the specified modification must update the oxygen-generator activation mechanism per Boeing Service Bulletins 737‑25‑1545 Rev 1 or 737‑25‑1548 by 60 months from 10 May 2007 (May 2012). The fix ensures masks deploy reliably during sudden cabin depressurisation, preventing incapacitation or death."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Directive maintains its original scope: requiring modification of the PSU chemical oxygen generator activation mechanism on the listed 737 models. It explicitly accepts prior compliant modifications (original SB) and FAA‑approved later revisions as alternate methods, which increases compliance flexibility but does not expand or narrow the set of affected aircraft."},"complexity_factors":["Applicability spans seven 737 series variants, requiring fleet-wide checks and potential staged scheduling.","Mandates modification per specific Boeing Service Bulletins (SB 737-25-1545 Rev 1 or SB 737-25-1548), creating dependency on external documents.","Allows earlier modifications (original SB issue) and later SB revisions approved as FAA AMOCs, requiring operators to verify acceptability of past work or seek AMOC approvals.","Cross-reference to FAA ADs (FAA AD 2007-07-02) adds inter-jurisdictional compliance considerations.","Compliance window of 60 months spreads scheduling but requires long-term tracking and record-keeping.","Technical labour and parts are required for each PSU, affecting maintenance downtime and direct costs to operators."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Boeing 737-300/400/500/600/700/800/900 series aeroplanes to modify the activation mechanism in each passenger service unit (PSU) chemical oxygen generator, following specified Boeing Service Bulletins, within 60 months. Operators pay for and must schedule the work during maintenance. The measure responds to FAA reports that some generators failed to activate during decompression, risking loss of supplemental oxygen for passengers and crew; earlier compliant modifications and FAA‑approved alternate methods are accepted."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-302-passenger-service-unit-chemical-oxygen-generators","history":"/api/acts/ad-b737-302-passenger-service-unit-chemical-oxygen-generators/history","analysis":"/api/acts/ad-b737-302-passenger-service-unit-chemical-oxygen-generators/analysis","conflicts":"/api/acts/ad-b737-302-passenger-service-unit-chemical-oxygen-generators/conflicts","importantCases":"/api/acts/ad-b737-302-passenger-service-unit-chemical-oxygen-generators/important-cases","documents":"/api/acts/ad-b737-302-passenger-service-unit-chemical-oxygen-generators/documents"}}