{"id":"F2006B05565","name":"AD/PA-25/29 - Wing Strut - Inspection","slug":"ad-pa-25-29-wing-strut-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46555,"registerId":"commonwealth-F2006B05565-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-25/29 - Wing Strut - 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-25/29 Wing Strut - Inspection 4/69\n\nApplicability: All models with lift struts which have exceeded 1500 hours total time in service.\n\n \n\nRequirement: Inspect the lower ends of the wing lift struts for cracking particularly in the threaded area of the rear spar attachment using at least a 10X glass.\n\n \n\nCompliance: Within 100 hour time in service after 15 April 1969 and thereafter at intervals not exceeding 500 hours time in service.\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":2307},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This airworthiness directive remains precisely focused on its original purpose: mandating periodic inspections of wing struts on Piper PA-25 aircraft. There is no evidence of scope expansion beyond this specific safety-critical hardware check."},"complexity_factors":["Single-page directive with no sections, subsections, or parts","Only one discrete technical requirement (visual inspection with magnification)","Minimal defined terminology (only 'time in service' requires technical aviation knowledge)","Simple single-condition applicability test (aircraft exceeding 1500 hours)"],"plain_english_summary":"**What this does:** This directive mandates safety inspections on specific agricultural aircraft to prevent catastrophic wing failure.\n\n**Who it affects:** Owners and operators of Piper PA-25 (Pawnee) series aeroplanes that have accumulated more than 1,500 total flight hours.\n\n**What must be done:** Inspect the bottom ends of the wing lift struts (the metal rods that hold the wings up) for cracks, paying particular attention to the threaded area where the strut screws into the rear wing spar. You must use a magnifying glass with at least 10-times magnification.\n\n**When to comply:**\n- **First inspection:** Within 100 flight hours after 15 April 1969\n- **Repeat inspections:** Every 500 flight hours thereafter\n\n**Why it matters:** Metal fatigue can cause these struts to crack over time. If a strut breaks in flight, the wing can detach from the aircraft, causing a crash. This rule ensures fatigue cracks are caught before they become dangerous."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-29-wing-strut-inspection","history":"/api/acts/ad-pa-25-29-wing-strut-inspection/history","analysis":"/api/acts/ad-pa-25-29-wing-strut-inspection/analysis","conflicts":"/api/acts/ad-pa-25-29-wing-strut-inspection/conflicts","importantCases":"/api/acts/ad-pa-25-29-wing-strut-inspection/important-cases","documents":"/api/acts/ad-pa-25-29-wing-strut-inspection/documents"}}