{"id":"F2006B02944","name":"AD/B737/45 Amdt 1 - Takeoff Configuration Warning System","slug":"ad-b737-45-amdt-1-takeoff-configuration-warning-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42286,"registerId":"commonwealth-F2006B02944-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/45 Amdt 1 - Takeoff Configuration Warning System","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Boeing 737 Series Aeroplanes\n\n \n\nAD/B737/45\n\nAmdt 1\n\n\nTakeoff Configuration Warning System 12/90\n\n \n\nApplicability: All model Boeing 737 series aircraft as listed in Boeing Service Bulletin 737-31-1033 Revision 1.\n\n \n\nRequirement: Modify the logic which enables Takeoff Configuration Warning Systems (TOCWS) in accordance with Boeing Service Bulletin 737-31-1033 Revision 1 or later revision.\n\n \n\nCompliance: Prior to 6 September 1992.\n\n \n\nBackground: Compliance with this AD is required in order to prevent takeoff configuration warning system nuisance warnings when taxi operations are conducted with the flaps intentionally retracted.\n\n \n\nAmendment 1 to this AD is issued to clarify the applicability.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 clarifies the applicability of the AD (Amendment 1). The core technical requirement (modify TOCWS logic per Boeing Service Bulletin 737-31-1033 Revision 1 or later) and the compliance deadline remain in the AD; the amendment only addresses which aircraft are covered rather than adding or removing the modification obligation (Applicability; Requirement; Compliance)."},"complexity_factors":["Single, narrowly focused technical requirement (modify TOCWS logic) rather than a multi-part regulatory regime (Requirement).","Relies on an external technical document (Boeing Service Bulletin 737-31-1033 Revision 1 or later) for implementation details, creating dependency on another source (Requirement).","Applies across all listed Boeing 737 models, producing fleet-wide scope that affects many operators (Applicability).","Fixed, relatively short compliance timeline creates scheduling and operational implications for aircraft operators (Compliance).","AD text is terse and does not specify costs, parts, or labour, requiring operators and maintainers to consult the service bulletin or their maintenance organisations for implementation detail (Requirement; Background)."],"plain_english_summary":"This Airworthiness Directive from CASA requires operators of Boeing 737s listed in Boeing Service Bulletin 737-31-1033 Revision 1 (or later) to modify the Takeoff Configuration Warning System logic to stop nuisance warnings when taxiing with flaps retracted. Compliance is mandatory by 6 September 1992.\n\nThe AD sets a legal obligation to follow the referenced service bulletin’s instructions but does not allocate costs, quantify work or downtime, or allow alternative means beyond later revisions of the bulletin."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — a specific technical modification to a specific aircraft system. Amendment 1 merely clarifies applicability without expanding the directive's reach."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined term implicitly referenced (TOCWS)","Single technical requirement with direct reference to external Boeing document","No nested conditions, exceptions, or cross-references to other legislation","Simple linear structure: applicability → requirement → compliance → background","Amendment 1 adds only clarifying language, no substantive complexity"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nIt requires owners and operators of **Boeing 737 aircraft** to modify the **Takeoff Configuration Warning System (TOCWS)** — the alarm that alerts pilots if the plane isn't properly configured for takeoff (for example, if flaps aren't set correctly).\n\n**Why the change was needed:**\nThe original system was giving **false alarms (\"nuisance warnings\")** when pilots were taxiing with flaps intentionally retracted. This update fixes the logic so the warning only triggers when it should.\n\n**Who must comply:**\nAnyone operating Boeing 737 models listed in Boeing Service Bulletin 737-31-1033 Revision 1.\n\n**What they must do:**\nFollow the technical instructions in that Boeing Service Bulletin to update the warning system's software/logic.\n\n**When:**\nBefore 6 September 1992 (this is a historical directive now long past its compliance date).\n\n**What changed in this version (Amendment 1):**\nOnly minor clarification about which specific aircraft models the directive applies to — no change to the actual technical requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-45-amdt-1-takeoff-configuration-warning-system","history":"/api/acts/ad-b737-45-amdt-1-takeoff-configuration-warning-system/history","analysis":"/api/acts/ad-b737-45-amdt-1-takeoff-configuration-warning-system/analysis","conflicts":"/api/acts/ad-b737-45-amdt-1-takeoff-configuration-warning-system/conflicts","importantCases":"/api/acts/ad-b737-45-amdt-1-takeoff-configuration-warning-system/important-cases","documents":"/api/acts/ad-b737-45-amdt-1-takeoff-configuration-warning-system/documents"}}