{"id":"F2006B02142","name":"AD/AC/81 Amdt 1 - Elevator Trim Tab","slug":"ad-ac-81-amdt-1-elevator-trim-tab","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41372,"registerId":"commonwealth-F2006B02142-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/81 Amdt 1 - Elevator Trim Tab","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 10/1985,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Elevator Trim Tab,81 Amdt 1\ntitle: Airworthiness Directive - AD/AC/81 Amdt 1 - Elevator Trim Tab\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)  Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\n \n\nAD/AC/81\n\nAmdt 1\n\n\nElevator Trim Tab 10/85\n\n \n\nApplicability: All models listed in Gulfstream Aerospace Service Bulletin No. 198A. Requirement: Gulfstream Aerospace S.B. No. 198A, Parts 1 and 2.\n\nCompliance: Part 1: Within 25 hours’ time in service after 02 September 1985 and thereafter at intervals not exceeding 100 hours’ time in service, or at each scheduled inspection for Maintenance Release issue, until modified in accordance with Part 2 of the Requirement Document.\n\n \n\nPart 2: Aircraft already modified in accordance with Part 2 of S.B. No. 198 require no further action.\n\n \n\nBackground:  This revision extends the aircraft serial number effectivity listed in Gulfstream Aerospace S.B. No. 198A.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1398},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment extends the aircraft serial number effectivity, meaning it now applies to additional aircraft (more specific planes by serial number) than were covered by the original directive."},"complexity_factors":["References external technical document (Gulfstream Service Bulletin No. 198A) without reproducing its contents","Specific compliance timeframes tied to flight hours and calendar dates","Two-tier compliance structure (interim inspections vs permanent modification)","Technical aviation terminology requiring domain knowledge"],"plain_english_summary":"A mandatory safety directive requires owners and operators of Gulfstream/Rockwell/Aero Commander 500, 600, and 700 series aircraft to inspect the elevator trim tab on a short interim schedule and then complete a permanent modification per Gulfstream Service Bulletin No. 198A. It aims to prevent in‑flight trim‑tab failures affecting pitch control. This amendment expands the specific serial numbers subject to the requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-81-amdt-1-elevator-trim-tab","history":"/api/acts/ad-ac-81-amdt-1-elevator-trim-tab/history","analysis":"/api/acts/ad-ac-81-amdt-1-elevator-trim-tab/analysis","conflicts":"/api/acts/ad-ac-81-amdt-1-elevator-trim-tab/conflicts","importantCases":"/api/acts/ad-ac-81-amdt-1-elevator-trim-tab/important-cases","documents":"/api/acts/ad-ac-81-amdt-1-elevator-trim-tab/documents"}}