{"id":"F2006B05999","name":"AD/PA-42/9 - Landing Gear Upper Bearing Retaining Pins and Strut Assemblies","slug":"ad-pa-42-9-landing-gear-upper-bearing-retaining-pins-and-strut-assemblies","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114397,"registerId":"commonwealth-F2006B05999-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-42/9 - Landing Gear Upper Bearing Retaining Pins and Strut Assemblies","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\n# AD/PA-42/9 Landing Gear Upper Bearing Retaining\n\nPins and Strut Assemblies Applicability: All model PA-42 with S/Nos 42-7800001 to 42-8001106. Requirement:               Action in accordance with Piper S.B. No 779A.\n\nNote: FAA AD85-08-05 refers.\n\n \n\nCompliance: Within 100 hours time in service after 31 October 1985.\n\n# 8/85\n\n \n\nBackground:  Failure of landing gear upper bearing retaining pins could result in unrestricted extension of the piston tube and wheel assemblies.\n\n \n\nThis Directive requires the replacement of the retaining pins and, in addition, an inspection and replacement of the upper bearing as applicable.\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":1464},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope—addressing a specific mechanical defect in a defined aircraft population without expansion into broader operational or airworthiness requirements."},"complexity_factors":["Narrow applicability limited to specific aircraft serial numbers","Single compliance action referencing an external technical standard (Piper Service Bulletin 779A)","Clear, fixed compliance deadline using simple metric (flight hours)","No conditional exceptions, nested definitions, or cross-references to other legislative provisions"],"plain_english_summary":"**What this is:** A safety order for owners of specific Piper PA-42 Cheyenne III aircraft (serial numbers 42-7800001 to 42-8001106).\n\n**What you must do:** Replace the retaining pins on the landing gear upper bearings, and inspect (and replace if necessary) the upper bearings themselves. You must follow the technical steps in **Piper Service Bulletin No. 779A**.\n\n**Why it matters:** If these retaining pins fail, the landing gear piston and wheels could drop down uncontrollably during flight—a serious safety risk.\n\n**When to comply:** You must complete this work within 100 hours of flying time after 31 October 1985."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-42-9-landing-gear-upper-bearing-retaining-pins-and-strut-assemblies","history":"/api/acts/ad-pa-42-9-landing-gear-upper-bearing-retaining-pins-and-strut-assemblies/history","analysis":"/api/acts/ad-pa-42-9-landing-gear-upper-bearing-retaining-pins-and-strut-assemblies/analysis","conflicts":"/api/acts/ad-pa-42-9-landing-gear-upper-bearing-retaining-pins-and-strut-assemblies/conflicts","importantCases":"/api/acts/ad-pa-42-9-landing-gear-upper-bearing-retaining-pins-and-strut-assemblies/important-cases","documents":"/api/acts/ad-pa-42-9-landing-gear-upper-bearing-retaining-pins-and-strut-assemblies/documents"}}