{"id":"F2006B05467","name":"AD/PA-23/41 - Auxiliary Front Spar - Inspection","slug":"ad-pa-23-41-auxiliary-front-spar-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46247,"registerId":"commonwealth-F2006B05467-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/41 - Auxiliary Front Spar - 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-23 (Apache and Aztec) Series Aeroplanes\n\n \n\nAD/PA-23/41 Auxiliary Front Spar - Inspection 2/71\n\nApplicability: All models.\n\n \n\nRequirement: Visually inspect the web of auxiliary front spar P/N 16010 at the outboard end in the area adjacent to rib P/N 16042 (STA 56) for vertical cracks especially near the bend radius.\n\n \n\nCompliance: Within 50 hours time in service after 4 January 1971.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2037},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This remains a narrow, targeted safety directive focused solely on the inspection of the auxiliary front spar in Piper PA-23 series aircraft. The scope has not expanded beyond this specific structural integrity check."},"complexity_factors":["Single, unambiguous inspection task with no alternative compliance methods or exceptions","Precise identification of affected components using manufacturer part numbers (P/N 16010, P/N 16042)","Clear, absolute compliance deadline (50 hours time in service after specified date)","No interpretation section, defined terms, or cross-references to other legislation","Narrow applicability limited to specific aircraft models only"],"plain_english_summary":"**What this is:** A mandatory safety inspection requirement (called an Airworthiness Directive) issued by the Civil Aviation Safety Authority (CASA) under aviation safety law.\n\n**Who it affects:** Owners and operators of **Piper PA-23 Apache and Aztec** aeroplanes.\n\n**What it requires:** You must perform a **visual inspection** of a specific structural part—the auxiliary front spar (identified by part number 16010)—at the outboard end near rib 16042. You are looking for **vertical cracks**, particularly around the bend radius (the curved section where the metal bends).\n\n**When:** Within 50 hours of flight time after **4 January 1971**.\n\n**Why it matters:** Cracks in this spar could weaken the aircraft's structure and potentially create safety risks. This directive ensures operators check for this specific manufacturing or wear-related defect."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-41-auxiliary-front-spar-inspection","history":"/api/acts/ad-pa-23-41-auxiliary-front-spar-inspection/history","analysis":"/api/acts/ad-pa-23-41-auxiliary-front-spar-inspection/analysis","conflicts":"/api/acts/ad-pa-23-41-auxiliary-front-spar-inspection/conflicts","importantCases":"/api/acts/ad-pa-23-41-auxiliary-front-spar-inspection/important-cases","documents":"/api/acts/ad-pa-23-41-auxiliary-front-spar-inspection/documents"}}