{"id":"F2006B04062","name":"AD/BEECH 56/30 - Elevator Trim Tab Actuator","slug":"ad-beech-56-30-elevator-trim-tab-actuator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43693,"registerId":"commonwealth-F2006B04062-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 56/30 - Elevator Trim Tab Actuator","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)  Beechcraft 56TC (Turbo Baron) Series Aeroplanes\n\n \n\nAD/BEECH 56/30 Elevator Trim Tab Actuator 2/92\n\nApplicability: Models and serial numbers as listed in Beechcraft Service Bulletin 2399. Requirement:              Action in accordance with mandatory Beechcraft Service Bulletin 2399.\n\nNote: FAA AD 91-17-01 Amdt 39-7099 refers.\n\n \n\nCompliance: At the next scheduled inspection for Maintenance Release issue after 29 February 1992.\n\n \n\nBackground:  There have been two fatal accidents reported, in which the elevator trim tab actuators were reversed following maintenance. The actions specified in this Directive are intended to prevent interchanging the right-hand and left-hand trim tab actuators that, if reversed, could result in loss of control of the aircraft.\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":false,"description":"The directive's scope matches its stated purpose: it targets the listed Beechcraft models/serial numbers and mandates following Service Bulletin 2399 to prevent interchange of left/right trim actuators. The AD does not expand requirements beyond those models/serials or beyond the corrective actions set out in the referenced Service Bulletin."},"complexity_factors":["Narrow applicability — applies only to models/serial numbers listed in Beechcraft Service Bulletin 2399 (Applicability).","Prescriptive external reference — requires compliance 'in accordance with mandatory Beechcraft Service Bulletin 2399' (Requirement), so technical specifics sit in the Service Bulletin rather than the AD text.","Fixed compliance timing — compliance tied to 'the next scheduled inspection for Maintenance Release issue after 29 February 1992' (Compliance), which creates a clear but time‑bound obligation.","Safety‑critical consequence — Background cites two fatal accidents from reversed actuators, increasing enforcement and inspection emphasis (Background).","Cross‑regulatory reference — notes related FAA AD (FAA AD 91‑17‑01), requiring attention to foreign directives for modelling compliance and parts/maintenance histories (Note)."],"plain_english_summary":"Requires owners/operators of specified Beechcraft 56TC (Turbo Baron) aeroplanes to carry out the mandatory actions in Beechcraft Service Bulletin 2399 at their next scheduled inspection after 29 February 1992 to ensure elevator trim tab actuators are not interchanged. The directive, issued by the Civil Aviation Safety Authority, responds to two fatal accidents where left‑ and right‑hand actuators were reversed; its mechanical aim is to prevent reversed actuator installation that could lead to loss of control. Operators pay inspection/rectification costs and maintenance staff must change handling and identification practice."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft model. The scope remains precisely limited to preventing trim tab actuator reversal in Beechcraft 56TC aircraft, exactly as originally intended."},"complexity_factors":["Single operative requirement (comply with external Service Bulletin)","No defined terms section — relies entirely on external document (Service Bulletin 2399)","Minimal conditional logic (only applicability and compliance date)","No cross-references to other legislation beyond noting related FAA directive","Extremely short — essentially a pointer to another technical document"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific Beechcraft 56TC (Turbo Baron) aircraft.\n\n**What it does:**\n- Requires owners/operators of affected aircraft to follow **Beechcraft Service Bulletin 2399** — a manufacturer's technical instruction\n- The bulletin prevents mechanics from accidentally swapping the left and right elevator trim tab actuators (small mechanical devices that help control the plane's pitch)\n\n**Why it matters:**\n- Two fatal crashes occurred because these actuators were installed on the wrong sides during maintenance\n- If reversed, the pilot's trim controls work backwards — pulling up makes the plane dive, pushing down makes it climb\n- This can cause sudden, unexpected loss of control\n\n**Who must comply:**\n- Owners of Beechcraft 56TC models listed in Service Bulletin 2399\n- Must complete the inspection at the next scheduled maintenance check after 29 February 1992\n\n**The bottom line:** A simple mechanical mix-up killed people. This rule makes checking actuator placement mandatory to prevent the same mistake."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-56-30-elevator-trim-tab-actuator","history":"/api/acts/ad-beech-56-30-elevator-trim-tab-actuator/history","analysis":"/api/acts/ad-beech-56-30-elevator-trim-tab-actuator/analysis","conflicts":"/api/acts/ad-beech-56-30-elevator-trim-tab-actuator/conflicts","importantCases":"/api/acts/ad-beech-56-30-elevator-trim-tab-actuator/important-cases","documents":"/api/acts/ad-beech-56-30-elevator-trim-tab-actuator/documents"}}