{"id":"F2013L01697","name":"AD/B737/294 Amdt 2 - Flightcrew Oxygen Masks","slug":"ad-b737-294-amdt-2-flightcrew-oxygen-masks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":127733,"registerId":"commonwealth-F2013L01697-current","compilationNumber":null,"startDate":"2026-04-03","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/B737/294 Amdt 2 | Flightcrew Oxygen Masks | 19/2013 |\n| ------------------ | ----------------------- | ------- |\n\n| Applicability: | Boeing Model 737-100, -200, -200C, -300, -400, -500, -600, -700, -700C, -800 and-900 series aeroplanes. |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Revise the Cabin Pressurization procedures in the Normal Procedures section of the AFMs for Model 737-100, -200, -200C, -300, -400, -500, -600, -700, -700C,-800, and -900 series aeroplanes to include the following procedure:\"For normal operations, the pressurization mode selector should be in AUTO prior to takeoff.\"2. Revise the Emergency Procedures section of the AFMs for Model 737-100, -200, -200C, -300, -400, and -500 series aeroplanes, or the Non-Normal Procedures section of the AFMs for Model 737-600, -700, -700C, -800, and -900 series aeroplanes, as applicable, to include the following procedure:\"WARNING HORN - CABIN ALTITUDE OR CONFIGURATIONRECALLCondition: An intermittent or steady warning horn sounds:In flight an intermittent horn indicates the cabin altitude is at or above 10,000 feetOn the ground an intermittent horn indicates an improper takeoff configuration when advancing thrust levers to takeoff thrustIn flight a steady horn indicates an improper landing configuration.If an intermittent horn sounds in flight:OXYGEN MASKS AND REGULATORS..............on, 100%CREW COMMUNICATIONS.................................Establish |\n\n| | Do the CABIN ALTITUDE WARNING OR RAPID DEPRESSURIZATION checklist.If an intermittent horn sounds on the ground:Assure proper aeroplane takeoff configuration.If a steady horn sounds in flight:Assure proper airplane landing configuration.”Method To Revising the AFMThe AFM revisions specified in requirements 1 and 2 of this AD may be done by inserting a copy of this AD into the AFM.When statements identical to those specified in requirements 1 and 2 of this AD have been included in general revisions of the AFM, then the general revision(s) may be inserted into the AFM, and the copy of the AD may be removed from the applicable revised sections of the AFM.Optional Action for Certain Requirements of AD/B737/208, AD/B737/216 and AD/B737/255.If any of the following optional actions are taken, make a notation to the effect in the compliance summary for the appropriate AD.For Model 737-100, -200 and -200C series aeroplanes: Using the phrase, “If the intermittent cabin altitude/configuration warning horn sounds in flight:” in place of the phrase, “If the cabin altitude warning horn sounds:” in the revisions to the “Cabin Altitude Warning or Rapid Depressurization” procedure is acceptable for compliance with AD/B737/255.For Model 737-300, -400 and -500 series aeroplanes: Using the phrase, “If the intermittent cabin altitude/configuration warning horn sounds in flight:” in place of the phrase, “If the cabin altitude warning horn sounds:” in the revisions to the “Cabin Altitude Warning or Rapid Depressurization” procedure is acceptable for compliance with AD/B737/208.For Model 737-600, -700, -700C, -800 and -900 series aeroplanes: Using the phrase, “If the intermittent cabin altitude/configuration warning horn sounds in flight:” in place of the phrase, “Condition: The cabin altitude warning horn sounds.” in the revisions to the “Cabin Altitude Warning or Rapid Depressurization” procedure is acceptable for compliance with AD/B737/216.Note: FAA AD 2006-13-13 Amdt 38-14666 dated 15 June 2006 refers. |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n| Compliance: | Within 60 days after the effective date of this AD.Revising the AFM as per the approved FAA AMOC Letter 130S-09-134a dated28 April 2009 is an alternate means of complying with requirement 2 of this AD. |\n| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | The effective date of this Amendment is 27 September 2013. |\n| Background: | This AD results from reports that aeroplanes have failed to pressurize, and that the flight crews failed to react properly to the cabin altitude warning horn. The issuing of this AD to prevent failure of the aeroplane to pressurize and subsequent failure of the flight crew to recognize and react to a valid cabin altitude warning horn, which could result in incapacitation of the flight crew due to hypoxia (lack of oxygen in body) and consequent loss of aeroplane control.Amendment 1 removed the word “RECALL” from the AFM amendment detailed in Requirement 2 and placed that word on the second line of the AFM.Amendment 2 allows the revising of the AFM as per the approved FAA AMOC Letter 130S-09-134a dated 28 April 2009 as an alternate means of complying with requirement 2 of this AD.Amendment 1 of this AD became effective on 26 October 2006.The original issue of this AD became effective on 28 September 2006. |\n\n![](image.001.png)\n\nPeter Nikolic \nDelegate of the Civil Aviation Safety Authority\n\n4 September 2013","sortOrder":0},{"sectionNumber":"AD/B737/294 Amdt 2","sectionType":"part","heading":"AD/B737/294 Amdt 2","content":"## AD/B737/294 Amdt 2","sortOrder":1},{"sectionNumber":"Flightcrew Oxygen Masks","sectionType":"part","heading":"Flightcrew Oxygen Masks","content":"## Flightcrew Oxygen Masks","sortOrder":2},{"sectionNumber":"19/2013","sectionType":"part","heading":"19/2013","content":"## 19/2013","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":4,"scope_assessment":{"changed":false,"description":"This AD remains tightly focused on its original safety purpose: preventing flight crew incapacitation due to hypoxia following cabin depressurisation events. Amendment 2 does not expand the scope beyond the original intent; it merely provides an additional approved alternative method of compliance (the FAA AMOC) for the same requirement. The applicability (Boeing 737 series aircraft) and core safety objective remain unchanged from the original 2006 issue."},"complexity_factors":["Multiple aircraft model variants covered (11 different 737 series), with slightly different manual sections required for older (-100 to -500) versus newer (-600 to -900) models","Cross-references to three other Airworthiness Directives (AD/B737/208, AD/B737/216, AD/B737/255) with optional compliance language","Nested conditional logic: different procedures apply depending on whether the warning horn is intermittent/steady and whether the aircraft is in flight or on ground","Incorporation by reference to external FAA document (AMOC Letter 130S-09-134a) as an approved alternative compliance method","Amendment history tracking (original issue, Amendment 1, Amendment 2) with specific effective dates and changes between versions","Specific formatting requirements for manual revisions with precise quoted language that must be inserted verbatim"],"plain_english_summary":"This CASA Airworthiness Directive forces Boeing 737-100 through -900 operators in Australia to revise their Aircraft Flight Manuals so pressurisation is set to AUTO before takeoff and pilots follow specific emergency steps if the cabin altitude warning sounds (don oxygen masks at 100% flow, establish crew communications, and follow the depressurisation checklist). It updates a prior AD (Amendment 2) to permit an FAA‑approved alternative means of compliance."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 2 adds an alternate compliance route by permitting AFM revision per FAA AMOC Letter 130S-09-134a (28 April 2009) for requirement 2; Amendment 1 adjusted placement of the word 'RECALL'. These amendments change permitted compliance methods and wording placement but do not broaden the list of affected aircraft or alter the core procedural requirements."},"complexity_factors":["Wide applicability across many Boeing 737 variants (‑100 through ‑900) increases operator diversity","Different AFM sections are amended depending on model (Normal vs Emergency vs Non‑Normal procedures)","Precise procedural wording required (specific warning-horn conditions and actions such as 'OXYGEN MASKS… on, 100%')","Accepts an FAA AMOC letter (130S-09-134a) as an alternate means of compliance for requirement 2, adding a regulatory compliance path","Cross-references and optional wording tied to earlier ADs (AD/B737/208, AD/B737/216, AD/B737/255) create conditional variations","Short compliance window (within 60 days) imposes an immediate administrative burden on operators","Allows either direct insertion of the AD text into the AFM or replacement by general AFM revisions once identical statements are included","Amendment history (movement of wording and added AMOC allowance) affects how operators implement the change"],"plain_english_summary":"Requires operators of Boeing 737 series (-100 through -900) to update their Aircraft Flight Manuals within 60 days to: set the pressurization mode selector to AUTO before takeoff and add cabin-altitude/warning-horn response steps (including “OXYGEN MASKS… on, 100%” and crew communications). The measure responds to reports of failed pressurization and crew failure to react to cabin-altitude warnings to reduce the risk of hypoxia. Operators bear the administrative compliance burden; an FAA-approved AMOC letter is accepted as an alternate way to meet part of the requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-294-amdt-2-flightcrew-oxygen-masks","history":"/api/acts/ad-b737-294-amdt-2-flightcrew-oxygen-masks/history","analysis":"/api/acts/ad-b737-294-amdt-2-flightcrew-oxygen-masks/analysis","conflicts":"/api/acts/ad-b737-294-amdt-2-flightcrew-oxygen-masks/conflicts","importantCases":"/api/acts/ad-b737-294-amdt-2-flightcrew-oxygen-masks/important-cases","documents":"/api/acts/ad-b737-294-amdt-2-flightcrew-oxygen-masks/documents"}}