{"id":"F2006B03896","name":"AD/BEECH 36/40 - Elevator Trim Tab Actuator","slug":"ad-beech-36-40-elevator-trim-tab-actuator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43505,"registerId":"commonwealth-F2006B03896-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 36/40 - 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 36 (Bonanza) Series Aeroplanes\n\n \n\nAD/BEECH 36/40 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\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":{"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 — approximately 150 words of substantive content","Only 1 defined applicability reference (Beechcraft Service Bulletin 2399)","Single, unambiguous compliance requirement with clear deadline","No nested exceptions, conditional logic, or cross-references to other legislation","Straightforward cause-and-effect: identified hazard → mandatory action → deadline","Background section provides clear safety rationale in plain language"],"plain_english_summary":"This CASA Airworthiness Directive mandates Beechcraft 36 (Bonanza) owners/operators and maintenance engineers follow Beechcraft Service Bulletin 2399 to inspect and correct elevator trim tab actuators, which can be mistakenly swapped during maintenance and cause reversed elevator control (pull back → dive), risking loss of control.\n\nThe rule is mandatory after two fatal accidents; compliance is required by the next scheduled inspection for issuing a Maintenance Release after 29 February 1992."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive maintains the original, targeted safety objective: prevent interchange of left/right elevator trim tab actuators on listed Beechcraft 36 aircraft by mandating SB 2399 actions at the next scheduled inspection. It does not expand applicability or impose additional types of regulatory obligations beyond the service-bulletin-based inspection/action requirement."},"complexity_factors":["Narrow applicability: only models/serial numbers listed in Beechcraft Service Bulletin 2399 (limits operator population).","Mandatory reference to an external service bulletin (operators must obtain and follow SB 2399).","Fixed compliance timing tied to the next scheduled Maintenance Release inspection after 29 February 1992 (administrative scheduling constraint).","Safety-critical outcome (reversed actuators can cause loss of control), increasing priority and scrutiny for compliance.","Affects multiple actors: aircraft owners/operators, maintenance organisations and certifying engineers (implementation and record-keeping burden).","Cross-reference to FAA AD 91-17-01 (regulatory harmonisation / reliance on foreign authority).","Technical work is maintenance/inspection-level rather than requiring design changes (practical but requires access to parts and trained staff)."],"plain_english_summary":"Requires operators of the Beechcraft 36 (Bonanza) series listed in Beechcraft Service Bulletin 2399 to carry out specified inspection/actions at the next scheduled maintenance release inspection after 29 February 1992, to ensure elevator trim tab actuators are not reversed. The directive targets aircraft owners, maintenance organisations and certifying engineers because it mandates procedures and recordkeeping intended to prevent actuator interchange that could cause loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-36-40-elevator-trim-tab-actuator","history":"/api/acts/ad-beech-36-40-elevator-trim-tab-actuator/history","analysis":"/api/acts/ad-beech-36-40-elevator-trim-tab-actuator/analysis","conflicts":"/api/acts/ad-beech-36-40-elevator-trim-tab-actuator/conflicts","importantCases":"/api/acts/ad-beech-36-40-elevator-trim-tab-actuator/important-cases","documents":"/api/acts/ad-beech-36-40-elevator-trim-tab-actuator/documents"}}