{"id":"F2006B06006","name":"AD/PA-44/15 - Wing and Carry-Through Structure","slug":"ad-pa-44-15-wing-and-carry-through-structure","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114404,"registerId":"commonwealth-F2006B06006-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-44/15 - Wing and Carry-Through Structure","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPiper PA-44 (Seminole) Series Aeroplanes\n\nAD/PA-44/15 Wing and Carry-Through Structure 5/95\n\nApplicability: All models.\n\nRequirement: 1. Retire the wing and wing carry-through structure as follows:\n\nPA-44-180; before 14 600 hours time in service, or within 200 hours time in service from 27 April 1995, whichever occurs last.\n\nPA-44-180T; before 16 400 hours time in service, or within 200 hours time in service from 27 April 1995, whichever occurs last.\n\n2. Retire the remainder of the aircraft structure before exceeding 29 200 hours time in service.\n\nCompliance: Effective as of 27 April 1995.\n\nBackground: The manufacturer has placed a service life on the wing and associated structure. As an interim requirement, pending substantiation of a longer safe life, a life for the remainder of the aircraft structure, corresponding to twice the PA-44-180 wing life, has been promulgated.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1779},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This appears to be the original scope of the directive, establishing specific flight hour limitations for wing and airframe retirement based on manufacturer service life data. The interim nature of the 29,200-hour limit for the remainder of the structure reflects the directive's original purpose of providing immediate safety margins pending further engineering analysis."},"complexity_factors":["Single aircraft type with only two sub-variants (PA-44-180 and PA-44-180T)","Simple numerical thresholds (flight hour limits) with no nested conditions","Standard four-part structure (Applicability, Requirement, Compliance, Background)","No cross-references to other legislation or regulatory provisions","Limited technical vocabulary (only standard aviation terms like 'time in service')"],"plain_english_summary":"This mandatory Australian safety notice requires owners/operators of Piper PA-44 Seminole twins to permanently retire key structural components at specified flight-hour limits (model-specific limits for wings/center wing and a 29,200-hour limit for the remainder of the airframe).  \n\nIt’s intended to prevent catastrophic failure from metal fatigue by imposing conservative “use-by” lifespans—the 29,200-hour cap is a temporary safety buffer while the manufacturer collects more life‑limit data."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-44-15-wing-and-carry-through-structure","history":"/api/acts/ad-pa-44-15-wing-and-carry-through-structure/history","analysis":"/api/acts/ad-pa-44-15-wing-and-carry-through-structure/analysis","conflicts":"/api/acts/ad-pa-44-15-wing-and-carry-through-structure/conflicts","importantCases":"/api/acts/ad-pa-44-15-wing-and-carry-through-structure/important-cases","documents":"/api/acts/ad-pa-44-15-wing-and-carry-through-structure/documents"}}