{"id":"F2006B04021","name":"AD/BEECH 55/76 - Elevator Trim Tab Actuator","slug":"ad-beech-55-76-elevator-trim-tab-actuator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43630,"registerId":"commonwealth-F2006B04021-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 55/76 - 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 55, 58 and 95-55 (Baron) Series Aeroplanes\n\n \n\nAD/BEECH 55/76 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\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive does not expand or redefine aircraft certification scope. It imposes a targeted maintenance obligation on the specified Beechcraft models/serial numbers to prevent actuator reversal, with compliance required at the next scheduled inspection after 29 February 1992, as set out in Service Bulletin 2399."},"complexity_factors":["Narrow applicability: limited to models and serial numbers listed in Beechcraft Service Bulletin 2399","Mandatory incorporation of an external document (Service Bulletin 2399) rather than detailed steps in the Directive","Single, clear compliance timing: 'next scheduled inspection for Maintenance Release issue after 29 February 1992'","Safety‑critical technical outcome (prevention of actuator reversal) raises implementation consequences if not followed","Reference to a related FAA AD (cross‑jurisdictional regulatory harmonisation)","Low regulatory discretion: requires specific action rather than optional measures","Operational burden concentrated on maintenance providers and aircraft owners (inspection/modification work, possible parts/labeling, record updates)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Beechcraft 55/58/95‑55 series aeroplanes to carry out the mandatory actions in Beechcraft Service Bulletin 2399 at the next scheduled maintenance-release inspection after 29 February 1992. It affects aircraft owners, maintenance organisations and mechanics; the stated purpose is to prevent left/right elevator trim‑tab actuator reversal (identified in two fatal accidents) by forcing a specified maintenance/identification action."},"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 specific aircraft models. It has not expanded beyond its original purpose of preventing trim tab actuator reversal."},"complexity_factors":["Very short document (under 200 words)","Only 1 substantive requirement (comply with referenced service bulletin)","No defined terms section","No cross-referencing to other legislation beyond single FAA AD reference","Simple conditional logic: single applicability trigger (model/serial number)","Clear, single compliance deadline"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific Beechcraft Baron aircraft models.\n\n**What it does:**\n- Requires owners/operators of certain Beechcraft 55, 58, and 95-55 (Baron) series aeroplanes to follow a specific maintenance procedure\n- Mandates compliance with Beechcraft Service Bulletin 2399\n\n**Why it matters:**\n- Two fatal accidents occurred because elevator trim tab actuators were accidentally swapped left-for-right during maintenance\n- If these actuators are reversed, pilots can lose control of the aircraft\n- This directive prevents that deadly mistake by requiring specific inspection/correction actions\n\n**Who must comply:**\n- Owners and operators of the affected Beechcraft Baron models (specific serial numbers listed in the referenced service bulletin)\n\n**When:**\n- By the next scheduled inspection for Maintenance Release issue after 29 February 1992\n\n**Key point:** This is a **retrospective safety fix** — it doesn't change how new planes are built, but requires existing aircraft to be checked to prevent a known fatal maintenance error."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-76-elevator-trim-tab-actuator","history":"/api/acts/ad-beech-55-76-elevator-trim-tab-actuator/history","analysis":"/api/acts/ad-beech-55-76-elevator-trim-tab-actuator/analysis","conflicts":"/api/acts/ad-beech-55-76-elevator-trim-tab-actuator/conflicts","importantCases":"/api/acts/ad-beech-55-76-elevator-trim-tab-actuator/important-cases","documents":"/api/acts/ad-beech-55-76-elevator-trim-tab-actuator/documents"}}