{"id":"F2006B05556","name":"AD/PA-25/19 - Engine Mount - Inspection","slug":"ad-pa-25-19-engine-mount-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46526,"registerId":"commonwealth-F2006B05556-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-25/19 - Engine Mount - Inspection","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-25 (Pawnee) Series Aeroplanes\n\n \n\nAD/PA-25/19 Engine Mount - Inspection 11/67\n\nApplicability: Model PA-25 and variants of that model.\n\n \n\nRequirement: 1. Inspect the engine mount tubes for cracking particularly in the vicinity of the engine mounting feet.\n\n \n\n2. Inspect the engine mounting brackets at the firewall for cracking.\n\n \n\nCompliance: Visually inspect at intervals not exceeding 25 hours time in service and inspect using a dye penetrant technique at intervals not exceeding 250 hours time in service.\n\n \n\nVisual inspections may be performed and certified for by the pilot.\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":956},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive for a specific aircraft type. It has not expanded beyond its original purpose of mandating engine mount inspections for the Piper PA-25 series."},"complexity_factors":["Document is extremely short with only 2 specific inspection requirements","No defined terms or interpretation sections","No conditional logic or nested exceptions","Single applicability criterion (specific aircraft model)","Clear compliance intervals with no cross-references to other legislation"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Piper PA-25 Pawnee series aircraft to routinely inspect the engine mount for cracks—visual checks every 25 flight hours (pilot-performable) and more detailed dye-penetrant inspections every 250 hours by licensed maintenance. \n\nIt targets a critical failure mode: undetected mount cracking can lead to engine separation in flight, so the rule prevents catastrophic structural failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-19-engine-mount-inspection","history":"/api/acts/ad-pa-25-19-engine-mount-inspection/history","analysis":"/api/acts/ad-pa-25-19-engine-mount-inspection/analysis","conflicts":"/api/acts/ad-pa-25-19-engine-mount-inspection/conflicts","importantCases":"/api/acts/ad-pa-25-19-engine-mount-inspection/important-cases","documents":"/api/acts/ad-pa-25-19-engine-mount-inspection/documents"}}