{"id":"F2006B04914","name":"AD/CESSNA 150/15 Amdt 1 - Tailplane Attachment","slug":"ad-cessna-150-15-amdt-1-tailplane-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44758,"registerId":"commonwealth-F2006B04914-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 150/15 Amdt 1 - Tailplane Attachment","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)  Cessna 150, F150, 152 & F152 Series Aeroplanes\n\n \n\nAD/CESSNA 150/15\n\nAmdt 1\n\n\nTailplane Attachment 6/69\n\n \n\nApplicability: All models in excess of 500 hours time in service (including new and modified aeroplanes).\n\n \n\nRequirement: Inspect the rear fuselage skin, stiffeners and doublers in the areas of the tailplane attachments for cracking.\n\n \n\nCompliance: Within 100 hours time in service after 6 June 1969 unless inspected within the previous 200 hours time in service and thereafter at intervals not exceeding 200 hours time in service from the preceding inspection.\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":1966},"content_quality":"ok","complexity_score":2,"rejection_reason":"","scope_assessment":{"changed":false,"description":"The directive remains tightly focused on its original safety purpose: inspecting tailplane attachment points for fatigue cracking in high-hour Cessna 150/152 aircraft. There is no evidence of scope expansion into unrelated maintenance areas or aircraft types."},"complexity_factors":["Single substantive requirement (one inspection task)","No defined terms section or interpretation provisions","Simple applicability test based solely on flight hours (>500 hours)","Linear compliance timeline with single alternative condition","No cross-references to other legislation or technical standards","No exceptions, exemptions, or nested conditional logic"],"plain_english_summary":"**What this does:** This rule requires owners of specific Cessna aircraft to regularly inspect the rear fuselage where the tail attaches to the body of the plane.\n\n**Who it affects:** Owners and operators of Cessna 150, F150, 152, and F152 aircraft that have flown more than 500 hours (including modified planes).\n\n**What must be done:** Check the metal skin, support brackets (*stiffeners*), and reinforcement plates (*doublers*) around the tail attachment points for cracks.\n\n**When:**\n- First inspection: Within 100 hours of flying time after 6 June 1969 (unless already inspected within the previous 200 hours)\n- Ongoing: Every 200 flight hours thereafter\n\n**Why it matters:** Fatigue cracks in these areas could cause the tail to separate from the fuselage during flight, leading to catastrophic loss of control. This directive prevents accidents by mandating regular checks for metal fatigue."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-150-15-amdt-1-tailplane-attachment","history":"/api/acts/ad-cessna-150-15-amdt-1-tailplane-attachment/history","analysis":"/api/acts/ad-cessna-150-15-amdt-1-tailplane-attachment/analysis","conflicts":"/api/acts/ad-cessna-150-15-amdt-1-tailplane-attachment/conflicts","importantCases":"/api/acts/ad-cessna-150-15-amdt-1-tailplane-attachment/important-cases","documents":"/api/acts/ad-cessna-150-15-amdt-1-tailplane-attachment/documents"}}