{"id":"F2006B02682","name":"AD/B727/16 - Control Column Shaker Motor - Circuit Revision","slug":"ad-b727-16-control-column-shaker-motor-circuit-revision","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41998,"registerId":"commonwealth-F2006B02682-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/16 - Control Column Shaker Motor - Circuit Revision","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/B727/16 Control Column Shaker Motor - Circuit Revision 2/66\n\nApplicability: All models as listed in Part (A) of SB 34-19. Document:  Boeing SB No. 34-19.\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\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The document as provided does not indicate any change in scope from an earlier instrument. It prescribes a circuit revision for control-column shaker motors on Boeing 727 models identified in Part (A) of Boeing SB 34-19 and requires immediate compliance. The AD references Boeing SB No. 34-19 for the technical work and does not itself expand or narrow applicability beyond that external reference (See: Applicability; Document; Compliance)."},"complexity_factors":["Dependency on an external technical document (Boeing SB No. 34-19) for all substantive instructions increases implementation complexity because the AD itself contains no technical detail.","Applicability is defined by reference (Part (A) of SB 34-19), which requires operators to cross-reference the service bulletin to determine whether a particular aircraft is affected.","Immediate compliance timing (\"Forthwith\") creates operational and scheduling pressure, increasing short-term implementation complexity.","The AD text provides no rationale, no alternative compliance paths, and no listed exemptions, which raises uncertainty about scope and administrative discretion.","Limited information in the source text constrains administrative and technical planning (parts, labour, downtime estimates must be derived from the service bulletin and maintenance providers)."],"plain_english_summary":"This airworthiness directive mandates an immediate circuit revision to the control-column shaker motor on specified Boeing 727 aircraft by requiring compliance with Boeing Service Bulletin No. 34-19. It affects owners, operators and maintenance organisations for the listed aeroplanes, imposes prompt mandatory work and associated costs on operators, and delegates technical detail to the Boeing service bulletin; the AD text itself provides no explanation of the underlying safety rationale."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific technical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating a circuit modification for the control column shaker motor."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 1 defined term implicitly referenced (SB = Service Bulletin)","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No conditional logic or exceptions — simple applicability statement and immediate compliance requirement","Single technical action required (circuit revision per external document)","No nested provisions or subsections"],"plain_english_summary":"**What this is:** 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:** It requires owners and operators of Boeing 727 series aeroplanes to modify the electrical circuit for the \"control column shaker motor.\" This device vibrates the pilot's control column to warn of an impending aerodynamic stall (when the wing loses lift). The directive references Boeing Service Bulletin 34-19, which contains the technical instructions for the fix.\n\n**Who it affects:** Anyone who owns, operates, or maintains Boeing 727 aircraft in Australia — specifically all models listed in Part (A) of Boeing Service Bulletin 34-19.\n\n**Why it matters:** The shaker motor is a critical safety system. If its electrical circuit fails, pilots won't receive the physical vibration warning before a stall, which could lead to loss of control. The \"Forthwith\" compliance requirement means this fix must be done immediately — not at the next scheduled maintenance check.\n\n**Key takeaway:** If you're flying or maintaining a Boeing 727 in Australia, you must immediately implement the circuit changes described in Boeing SB 34-19 to ensure the stall warning system works reliably."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-16-control-column-shaker-motor-circuit-revision","history":"/api/acts/ad-b727-16-control-column-shaker-motor-circuit-revision/history","analysis":"/api/acts/ad-b727-16-control-column-shaker-motor-circuit-revision/analysis","conflicts":"/api/acts/ad-b727-16-control-column-shaker-motor-circuit-revision/conflicts","importantCases":"/api/acts/ad-b727-16-control-column-shaker-motor-circuit-revision/important-cases","documents":"/api/acts/ad-b727-16-control-column-shaker-motor-circuit-revision/documents"}}