{"id":"F2006B03574","name":"AD/BEA 121/10 - Rudder Drain Hole","slug":"ad-bea-121-10-rudder-drain-hole","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43141,"registerId":"commonwealth-F2006B03574-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEA 121/10 - Rudder Drain Hole","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)  Beagle B121 (Pup) Series Aeroplanes\n\n \n\nAD/BEA 121/10 Rudder Drain Hole 4/72\n\nApplicability: All models.\n\n \n\nRequirement: Provide a suitable drain hole in the lower rudder area to ensure satisfactory drainage of moisture from within the rudder.\n\n \n\nCompliance: Within 100 hours time in service after 28 April 1972.\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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1809},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive remains focused on its original specific purpose: mandating a rudder drain hole modification for the Beagle B121 aircraft type to prevent moisture accumulation. There is no evidence of scope creep beyond this targeted airworthiness measure."},"complexity_factors":["Single, straightforward mechanical requirement with no conditional provisions","No defined terms requiring interpretation","No cross-references to other legislation or technical standards","No exceptions, exemptions, or alternative compliance methods stated"],"plain_english_summary":"**What this does:** This is a safety rule for owners of Beagle B121 Pup aircraft. It requires installing a small drain hole in the bottom of the plane's rudder (the vertical tail fin).\n\n**Who it affects:** Owners and operators of all Beagle B121 Pup model aeroplanes.\n\n**Why it matters:** Without a drain hole, moisture can get trapped inside the rudder and cause corrosion (rust) or structural damage. This simple modification lets water escape, preventing deterioration that could affect flight safety.\n\n**What must be done:** A suitable drain hole must be added to the lower rudder area to allow moisture to drain out.\n\n**Deadline:** The work had to be completed within 100 hours of flying time after 28 April 1972."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bea-121-10-rudder-drain-hole","history":"/api/acts/ad-bea-121-10-rudder-drain-hole/history","analysis":"/api/acts/ad-bea-121-10-rudder-drain-hole/analysis","conflicts":"/api/acts/ad-bea-121-10-rudder-drain-hole/conflicts","importantCases":"/api/acts/ad-bea-121-10-rudder-drain-hole/important-cases","documents":"/api/acts/ad-bea-121-10-rudder-drain-hole/documents"}}