{"id":"F2006B04262","name":"AD/BEECH 90/77 - Landing Gear Service Valve","slug":"ad-beech-90-77-landing-gear-service-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44061,"registerId":"commonwealth-F2006B04262-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 90/77 - Landing Gear Service Valve","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 90 and 65-90 (King Air) Series Aeroplanes\n\n \n\nAD/BEECH 90/77 Landing Gear Service Valve 8/87\n\nApplicability: Model Beech C90A, serial numbers LJ-1063 through LJ-1099. Requirement:  Action in accordance with Beechcraft S.B. No. 2023.\n\nCompliance: Prior to the issue of a Certificate of Airworthiness.\n\n \n\nBackground: The manufacturer has determined that to reduce the possibility of the landing gear service valve opening during flight, a retainer is installed on the floorboard, and lockwire is installed on the service valve knob.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2002},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This airworthiness directive remains a targeted safety intervention addressing the specific risk of landing gear service valve malfunction. It has not expanded beyond its original technical scope as a mandatory modification for the specified aircraft series."},"complexity_factors":["Single, specific requirement with no conditional exceptions","Narrow applicability limited to one aircraft model and specific serial number range","No defined terms or interpretation section","Straightforward compliance deadline with no alternative methods stated"],"plain_english_summary":"**What this does:** This directive requires owners of specific Beechcraft King Air aircraft to install a safety modification to prevent the landing gear service valve from accidentally opening during flight.\n\n**Who it affects:** Owners and operators of Beechcraft Model C90A aircraft with serial numbers between LJ-1063 and LJ-1099.\n\n**What must be done:** Install a retainer on the floorboard and apply lockwire (safety wire) to the service valve knob, following the manufacturer's Service Bulletin No. 2023.\n\n**When:** Before the aircraft can be issued with a Certificate of Airworthiness (meaning it must be done before the plane is deemed airworthy or returns to service).\n\n**Why it matters:** If the landing gear service valve opens accidentally during flight, it could affect the operation of the landing gear, creating a safety risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-90-77-landing-gear-service-valve","history":"/api/acts/ad-beech-90-77-landing-gear-service-valve/history","analysis":"/api/acts/ad-beech-90-77-landing-gear-service-valve/analysis","conflicts":"/api/acts/ad-beech-90-77-landing-gear-service-valve/conflicts","importantCases":"/api/acts/ad-beech-90-77-landing-gear-service-valve/important-cases","documents":"/api/acts/ad-beech-90-77-landing-gear-service-valve/documents"}}