{"id":"F2006B02767","name":"AD/B727/64 Amdt 1 - Take-Off Warning Switch Setting Revision - Modification","slug":"ad-b727-64-amdt-1-take-off-warning-switch-setting-revision-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42109,"registerId":"commonwealth-F2006B02767-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/64 Amdt 1 - Take-Off Warning Switch Setting Revision - Modification","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 727 Series Aeroplanes\n\n \n\nAD/B727/64\n\nAmdt 1\n\n\nTake-Off Warning Switch Setting Revision - Modification\n\n\n2/70\n\n \n\nApplicability: All models listed in requirement document. Document: Boeing SB No. 27-102, Rev. 2.\n\nCompliance: Forthwith.\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\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":"This entry is labelled as Amendment 1 to AD/B727/64, and it specifies a revision of take-off warning switch settings by reference to Boeing SB No. 27-102 Rev. 2. The amendment therefore changes the original AD by imposing the modification described in the listed revision and by updating the technical reference and/or affected models as set out in the requirement document (Applicability; Document). Compliance is required forthwith."},"complexity_factors":["Reliance on an external technical document (Boeing SB No. 27-102 Rev. 2) for procedural detail","Immediate compliance requirement ('Forthwith') creating scheduling and operational urgency","Broad applicability statement ('All models listed in requirement document') requiring operators to check the separate requirement document","AD text provides no alternatives or exemptions within the excerpt, so acceptable means of compliance are determined by the referenced SB or regulator","Technical nature of the work (electromechanical take-off warning switch settings) which may involve specialised maintenance and certification steps"],"plain_english_summary":"This AD requires operators of the specified Boeing 727 models to immediately modify take-off warning switch settings by carrying out Boeing Service Bulletin No. 27-102, Revision 2. It applies to all models listed in the requirement document and directs prompt compliance.\n\nAffected owners/operators must obtain and implement the SB’s procedure at their expense; the Civil Aviation Safety Authority enforces the mandatory change and oversight of compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, targeted safety directive focused specifically on Boeing 727 take-off warning systems. It represents the original and continuing purpose of Airworthiness Directives: mandating specific safety modifications. There is no evidence of scope creep or expansion beyond this single technical issue."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section","No cross-references to other legislation beyond a single technical reference document","Simple conditional structure: applicability statement + compliance requirement","Single mandatory action with no exceptions or alternative compliance methods","Minimal procedural detail — relies entirely on external Boeing technical document for implementation specifics"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific fixes or inspections on aircraft.\n\n**What it does:** It orders owners and operators of **Boeing 727 series aircraft** to modify the **take-off warning switch settings**. This switch is part of the system that alerts pilots if the aircraft isn't properly configured for take-off (for example, if flaps aren't set correctly). The directive requires implementing a specific design change outlined in **Boeing Service Bulletin 27-102, Revision 2**.\n\n**Who it affects:** Anyone who owns, operates, or maintains Boeing 727 aircraft in Australia.\n\n**Why it matters:** Incorrect take-off configuration can lead to catastrophic accidents. This directive ensures the warning system operates with updated, safer settings. The compliance deadline is **\"forthwith\"** — meaning immediately, with no grace period.\n\n**Key details:**\n- **Applies to:** All Boeing 727 models covered in the referenced Boeing document\n- **Required action:** Physical modification of the take-off warning system\n- **Compliance:** Immediate (forthwith)\n- **Technical reference:** Boeing Service Bulletin 27-102, Rev. 2"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-64-amdt-1-take-off-warning-switch-setting-revision-modification","history":"/api/acts/ad-b727-64-amdt-1-take-off-warning-switch-setting-revision-modification/history","analysis":"/api/acts/ad-b727-64-amdt-1-take-off-warning-switch-setting-revision-modification/analysis","conflicts":"/api/acts/ad-b727-64-amdt-1-take-off-warning-switch-setting-revision-modification/conflicts","importantCases":"/api/acts/ad-b727-64-amdt-1-take-off-warning-switch-setting-revision-modification/important-cases","documents":"/api/acts/ad-b727-64-amdt-1-take-off-warning-switch-setting-revision-modification/documents"}}