{"id":"F2006B07506","name":"AD/TSA-600/42 Amdt 1 - Rear Spar Corrosion","slug":"ad-tsa-600-42-amdt-1-rear-spar-corrosion","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49991,"registerId":"commonwealth-F2006B07506-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TSA-600/42 Amdt 1 - Rear Spar Corrosion","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)  Aerostar (Piper/Ted Smith) 600 and 700 Series Aeroplanes\n\n \n\n# AD/TSA-600/42\n\nAmdt 1\n\nApplicability: All Models.\n\n# Rear Spar Corrosion 3/94\n\n \n\nRequirement: 1. Inspect the upper skin of the L/H and R/H mainplanes in the area above the rear spars for evidence of bulging, paying particular attention to the area between the mainplane root end and the nacelle. Evidence of bulging could indicate severe corrosion of the spar, and will necessitate further investigation.\n\n \n\n2. Report findings of any bulging or subsequent rectification to a CAA District Airworthiness Office for forwarding to the Manager, Structures Section Canberra, or direct by fax no. 06 268 4594.\n\n \n\nCompliance: Prior to 31 July 1993, and thereafter at intervals not to exceed two calendar years.\n\nThe compliance time of the initial issue of this Directive remains unchanged, with the repetitive inspection requirement introduced by this issue.\n\n \n\nThis Amendment is effective from 3 March 1994.\n\n \n\nBackground: A local report was received by the Authority of severe corrosion of the rear spar caps.\n\nAmendment 1 is issued to introduce a calendar time repetitive inspection, in consideration that the design of the spar assembly would allow the existence of a considerable amount of corrosion before any bulging of the skin was evident.\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":1923},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment introduces a repetitive inspection requirement to supplement the original one-time inspection, but remains focused on the original purpose of detecting rear spar corrosion in the specified aircraft. The subject matter has not expanded beyond airworthiness monitoring of the rear spar structure."},"complexity_factors":["Single-page instrument with minimal text and straightforward instructions","Only two specific action items (visual inspection and reporting)","Simple biennial (every two years) compliance schedule","No defined terms, interpretation sections, or cross-references to other legislation","Clear applicability limited to specific aircraft models (Aerostar 600/700 series)"],"plain_english_summary":"This AD requires owners/operators of Aerostar 600 and 700 series aircraft to inspect the upper wing surfaces for bulging (indicative of hidden, severe corrosion in the rear wing spars) particularly between the fuselage and engine nacelle, and to report findings to the CAA. Inspections were first due by 31 July 1993 and must be repeated every two years to detect concealed spar corrosion that could threaten wing structural integrity."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tsa-600-42-amdt-1-rear-spar-corrosion","history":"/api/acts/ad-tsa-600-42-amdt-1-rear-spar-corrosion/history","analysis":"/api/acts/ad-tsa-600-42-amdt-1-rear-spar-corrosion/analysis","conflicts":"/api/acts/ad-tsa-600-42-amdt-1-rear-spar-corrosion/conflicts","importantCases":"/api/acts/ad-tsa-600-42-amdt-1-rear-spar-corrosion/important-cases","documents":"/api/acts/ad-tsa-600-42-amdt-1-rear-spar-corrosion/documents"}}