{"id":"F2006B05980","name":"AD/PA-42/14 - Tailcone Drain Holes","slug":"ad-pa-42-14-tailcone-drain-holes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136182,"registerId":"commonwealth-F2006B05980-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-42/14 - Tailcone Drain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)  Piper PA-42 (Cheyenne III) Series Aeroplanes\n\n \n\nAD/PA-42/14 Tailcone Drain Holes 6/87\n\nApplicability: All models listed in the Requirement Document. Requirement: Action in accordance with Piper SB No. 857.\n\nCompliance: At the next scheduled inspection for Maintenance Release issue after 4 June 1987 or 50 hours time in service after 4 June 1987 whichever occurs first.\n\n \n\nBackground:  Accumulated debris can block existing drain holes and result in water freezing and possible control cable and pulley obstruction.\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":1509},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope: addressing blocked tailcone drain holes in Piper PA-42 aircraft to prevent freezing and control cable obstruction. No expansion into broader operational or maintenance requirements."},"complexity_factors":["Single-page directive with only four standard fields (Applicability, Requirement, Compliance, Background)","No defined terms or interpretation section","Single external reference to manufacturer service bulletin (Piper SB No. 857)","Simple 'whichever occurs first' compliance logic with only two conditions","Narrow applicability limited to one specific aircraft series"],"plain_english_summary":"**What this requires**\nOwners and operators of Piper PA-42 Cheyenne III aircraft must inspect and clear the drain holes located in the tail section (tailcone) of the plane, following the manufacturer's instructions in Piper Service Bulletin No. 857.\n\n**Why it matters**\nIf debris blocks these drain holes, water can accumulate and freeze. This ice can jam the control cables and pulleys that operate the aircraft's flight controls, potentially causing a loss of control.\n\n**Who must comply**\nAnyone operating any model of Piper PA-42 (Cheyenne III) series aeroplanes.\n\n**When to do it**\nBy the earlier of:\n* The next scheduled inspection for Maintenance Release (the regular safety check required to keep the aircraft registered), **or**\n* Within 50 hours of flight time after 4 June 1987"}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-42-14-tailcone-drain-holes","history":"/api/acts/ad-pa-42-14-tailcone-drain-holes/history","analysis":"/api/acts/ad-pa-42-14-tailcone-drain-holes/analysis","conflicts":"/api/acts/ad-pa-42-14-tailcone-drain-holes/conflicts","importantCases":"/api/acts/ad-pa-42-14-tailcone-drain-holes/important-cases","documents":"/api/acts/ad-pa-42-14-tailcone-drain-holes/documents"}}