{"id":"F2006B03808","name":"AD/BEECH 33/40 - Elevator Trim Tab Actuator","slug":"ad-beech-33-40-elevator-trim-tab-actuator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43404,"registerId":"commonwealth-F2006B03808-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 33/40 - 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 33 and 35-33 (Debonair/Bonanza) Series Aeroplanes\n\n \n\nAD/BEECH 33/40 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific known defect in specific aircraft models. It has not expanded beyond its original purpose of preventing trim tab actuator reversal."},"complexity_factors":["Single, specific mechanical component addressed (elevator trim tab actuator)","Only one substantive requirement: follow the referenced Service Bulletin","No defined terms section — uses standard aviation terminology","No nested exceptions or conditional logic","Cross-reference limited to one FAA AD and one manufacturer Service Bulletin","Total length: approximately 150 words of operative text"],"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 maintenance actions on certain aircraft.\n\n**What it does:**\n- **Targets:** Beechcraft 33 and 35-33 series aeroplanes (Debonair/Bonanza models) — specific serial numbers listed in Beechcraft Service Bulletin 2399\n- **Requires:** Aircraft owners/operators must follow the instructions in Beechcraft Service Bulletin 2399 (a manufacturer-issued technical document)\n- **Purpose:** Prevents a deadly maintenance error where the **elevator trim tab actuators** (small mechanical devices that help control the aircraft's pitch/stability) get swapped between left and right sides during repairs\n\n**Why it matters:**\nTwo fatal accidents had already occurred because mechanics accidentally reversed these parts. If installed backwards, the pilot's trim controls work in reverse — pull up, the plane goes down — causing immediate loss of control and potentially crashing the aircraft.\n\n**When to comply:** By the next scheduled inspection for issuing a Maintenance Release (Australia's official certificate that an aircraft is safe to fly) after 29 February 1992.\n\n**Key point:** This isn't optional. \"Airworthiness Directive\" means comply or the aircraft cannot legally fly."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument sets a targeted, model/serial-number-based requirement to follow Beechcraft Service Bulletin 2399 at the next Maintenance Release inspection after 29 February 1992 (Applicability; Requirement; Compliance). The text contains no statement that it alters or expands an earlier scope; it simply prescribes mandatory action for the listed aircraft. There is therefore no indication within this document that the scope has changed from any prior stated intent."},"complexity_factors":["Dependency on an external document (Beechcraft Service Bulletin 2399) for the substantive technical instructions (Requirement; Applicability).","Compliance timing tied to the next scheduled Maintenance Release inspection rather than a fixed calendar date, which requires tracking inspection schedules (Compliance).","Safety-critical technical detail (correct left/right actuator installation) whose effectiveness depends on precise maintenance execution (Background; Requirement).","Need to identify applicability by model and serial number as listed only in the Service Bulletin, adding administrative steps to determine whether a given aircraft is covered (Applicability).","Cross-reference to an FAA AD creates a cross-jurisdictional point of alignment but no additional procedural detail in this text (Note)."],"plain_english_summary":"Owners/operators and maintenance organisations of specified Beechcraft 33 and 35-33 serial numbers must carry out the actions in Beechcraft Service Bulletin 2399 at the next scheduled inspection for Maintenance Release after 29 Feb 1992. The mandatory measure—aligned with an FAA AD—aims to prevent reversed elevator trim tab actuators after two fatal accidents. Compliance is compulsory, imposes inspection/repair costs on operators, and depends on accurate applicability and faithful execution of the bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-33-40-elevator-trim-tab-actuator","history":"/api/acts/ad-beech-33-40-elevator-trim-tab-actuator/history","analysis":"/api/acts/ad-beech-33-40-elevator-trim-tab-actuator/analysis","conflicts":"/api/acts/ad-beech-33-40-elevator-trim-tab-actuator/conflicts","importantCases":"/api/acts/ad-beech-33-40-elevator-trim-tab-actuator/important-cases","documents":"/api/acts/ad-beech-33-40-elevator-trim-tab-actuator/documents"}}