{"id":"F2006B03504","name":"AD/BAe 146/54 - Elevator Drain Holes","slug":"ad-bae-146-54-elevator-drain-holes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43058,"registerId":"commonwealth-F2006B03504-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/54 - Elevator Drain Holes","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 146 Series Aeroplanes\n\n \n\nAD/BAe 146/54 Elevator Drain Holes  10/95 DM\n\nApplicability: All series BAe 146 and Avro 146-RJ aircraft, except aircraft which have either mod.\n\nHCM01490A or C previously embodied.\n\n \n\nRequirement: Action in accordance with British Aerospace Mandatory Service Bulletin 55-13- 01490B.\n\n \n\nCompliance: Before 15 September 1995.\n\n \n\nBackground: Reports were received by the manufacturer of water accumulation in the elevators following steep climbs. Undrained accumulated water may upset the elevator balance.\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":2150},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow scope addressing a specific mechanical defect (elevator water drainage) in specific aircraft models. There is no indication of scope expansion beyond the original safety issue."},"complexity_factors":["Single-page directive with no internal cross-references to other legislation","Only one operative requirement incorporating an external technical standard by reference","Simple applicability clause containing a single exception (aircraft with prior modifications HCM01490A or C)","No definitions section, schedules, or conditional logic pathways"],"plain_english_summary":"**What this means:** The aviation safety regulator (CASA) is ordering airlines and aircraft owners to fix a specific safety issue on certain British Aerospace jet airliners.\n\n**Who is affected:** Owners and operators of BAe 146 and Avro 146-RJ series aircraft — specifically, those that haven't already had modifications HCM01490A or C installed.\n\n**What must be done:** Aircraft operators must follow a technical service bulletin (British Aerospace Mandatory Service Bulletin 55-13-01490B) that deals with drain holes in the elevators (the movable flaps on the tail that control the aircraft's pitch).\n\n**Why it matters:** Water was collecting inside the elevators after steep climbs. If this water can't drain out, it can throw off the balance of the elevators, potentially making the aircraft difficult to control. This directive mandates a fix to ensure the drain holes work properly.\n\n**Deadline:** The work had to be completed before 15 September 1995."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-54-elevator-drain-holes","history":"/api/acts/ad-bae-146-54-elevator-drain-holes/history","analysis":"/api/acts/ad-bae-146-54-elevator-drain-holes/analysis","conflicts":"/api/acts/ad-bae-146-54-elevator-drain-holes/conflicts","importantCases":"/api/acts/ad-bae-146-54-elevator-drain-holes/important-cases","documents":"/api/acts/ad-bae-146-54-elevator-drain-holes/documents"}}