{"id":"F2006B03627","name":"AD/BEECH 1900/1 - Stabiliser and Fin Moisture Sealing","slug":"ad-beech-1900-1-stabiliser-and-fin-moisture-sealing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43217,"registerId":"commonwealth-F2006B03627-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 1900/1 - Stabiliser and Fin Moisture Sealing","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 8/1989,Aircraft above 5700 kg,Beechcraft 1900 Series Aeroplanes,Stabiliser and Fin Moisture Sealing,1\ntitle: Airworthiness Directive - AD/BEECH 1900/1 - Stabiliser and Fin Moisture Sealing\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 1900 Series Aeroplanes\n\n \n\nAD/BEECH 1900/1 Stabiliser and Fin Moisture Sealing 8/89\n\nApplicability: Model 1900 Serial Nos UA1 to UA3;\n\n \n\nModel 1900C Serial Nos UB-1 to B-74 and UC-1 to UC-46.\n\n \n\nRequirement: Action in accordance with Beechcraft B 2254.\n\n \n\nCompliance: Prior to the next inspection for Maintenance release issue after 10 August 1989 or within 100 hours time in service after 10 August 1989 whichever is later.\n\n \n\nBackground: The Authority is aware of control cable freezing occurring in local 100 and 200 series aircraft. This was addressed by Australian mandatory action. The manufacturer has now indicated that the 1900 series is also susceptible.\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\n \n\nFederal Register of Legislative Instruments F2006B03627\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2059},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete airworthiness directive addressing a specific identified safety defect (moisture ingress leading to control cable freezing) in specific aircraft models. There is no indication the scope has expanded beyond the original safety issue."},"complexity_factors":["Very short directive with minimal legal text (under 200 words)","Single external technical reference to Beechcraft document B 2254 (the actual instructions are not included)","Narrow applicability limited to specific serial numbers rather than broad categories","Simple compliance structure: perform the action by the specified deadline"],"plain_english_summary":"This mandatory Airworthiness Directive requires owners/operators of specified Beechcraft 1900/1900C aircraft to seal the stabiliser and fin per Beechcraft B 2254 to stop moisture entering and freezing the control cables. The modification must be done by the next scheduled maintenance after 10 Aug 1989 or within 100 flight hours thereafter. Without it, frozen cables could seize and cause loss of pitch or directional control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-1900-1-stabiliser-and-fin-moisture-sealing","history":"/api/acts/ad-beech-1900-1-stabiliser-and-fin-moisture-sealing/history","analysis":"/api/acts/ad-beech-1900-1-stabiliser-and-fin-moisture-sealing/analysis","conflicts":"/api/acts/ad-beech-1900-1-stabiliser-and-fin-moisture-sealing/conflicts","importantCases":"/api/acts/ad-beech-1900-1-stabiliser-and-fin-moisture-sealing/important-cases","documents":"/api/acts/ad-beech-1900-1-stabiliser-and-fin-moisture-sealing/documents"}}