{"id":"F2006B10394","name":"AD/HS 125/116 - Standby Inverter Cover","slug":"ad-hs-125-116-standby-inverter-cover","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116053,"registerId":"commonwealth-F2006B10394-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/116 - Standby Inverter Cover","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)  British Aerospace BAe 125 Series Aeroplanes\n\n \n\nAD/HS 125/116 Standby Inverter Cover 3/91\n\nApplicability: As detailed in the Requirement Document.\n\n \n\nRequirement: Action in accordance with BAe SB 24-279-3255A dated 16 November 1990.\n\n \n\nNote: Compliance with this SB is classified mandatory by the CAA (UK).\n\n \n\nCompliance: As specified in the Requirement Document.\n\n \n\nBackground: Action in accordance with this AD is considered mandatory in order to reduce the possibility of the standby inverter being contaminated by condensation.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1458},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This airworthiness directive remains targeted at its original purpose: requiring a specific maintenance action on BAe 125 aircraft to prevent standby inverter contamination by condensation. It has not expanded beyond this narrow technical safety issue."},"complexity_factors":["Single requirement referencing external technical document without reproducing contents","No defined terms or interpretation section","No conditional logic, exceptions, or cross-references to other legislation","Narrow applicability limited to specific aircraft model"],"plain_english_summary":"**What this does:** This is a mandatory safety instruction for owners and operators of British Aerospace BAe 125 series aircraft.\n\n**What you must do:** Follow the maintenance procedures outlined in British Aerospace Service Bulletin SB 24-279-3255A (dated 16 November 1990). This document contains specific technical instructions about the standby inverter cover.\n\n**Why it matters:** The standby inverter is a backup electrical power system. Without this fix, condensation (moisture) can get inside the inverter and cause it to fail. Since this is a backup power source, failure could be dangerous if the main aircraft electrical systems stop working.\n\n**Who decided this:** The UK Civil Aviation Authority classified the service bulletin as mandatory, and Australia's Civil Aviation Safety Authority (CASA) agrees this action is necessary for air safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-116-standby-inverter-cover","history":"/api/acts/ad-hs-125-116-standby-inverter-cover/history","analysis":"/api/acts/ad-hs-125-116-standby-inverter-cover/analysis","conflicts":"/api/acts/ad-hs-125-116-standby-inverter-cover/conflicts","importantCases":"/api/acts/ad-hs-125-116-standby-inverter-cover/important-cases","documents":"/api/acts/ad-hs-125-116-standby-inverter-cover/documents"}}