{"id":"F2006B11081","name":"AD/LA-4/7 - Hull Frame Station 97 - Inspection and Modification","slug":"ad-la-4-7-hull-frame-station-97-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56737,"registerId":"commonwealth-F2006B11081-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LA-4/7 - Hull Frame Station 97 - Inspection and Modification","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)  Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes\n\n \n\nAD/LA-4/7 Hull Frame Station 97 - Inspection and Modification\n\nApplicability: All models with S/Nos. prior to 546. Document:  Consolidated Aeronautics SL L44.\n\nCompliance: Within 100 hours time in service after 31 May 1973.\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\n \n\n\n4/73\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2106},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive retains its original narrow scope from 1973, targeting only a specific structural defect (Hull Frame Station 97) on a limited subset of aircraft (pre-546 serial numbers). There is no evidence of expansion beyond the original airworthiness issue."},"complexity_factors":["Extremely short document with no interpretation section or defined terms","Single unambiguous applicability test (serial number threshold)","One clear compliance action with fixed deadline","No exceptions, exemptions, or conditional provisions","Requires cross-reference to external technical document (Service Letter L44) to understand exact work required"],"plain_english_summary":"**What this is:** An Airworthiness Directive — a mandatory safety notice requiring owners of specific light aircraft to inspect and repair a structural component.\n\n**Who it affects:** Owners and operators of Consolidated Aeronautics LA-4 and Colonial series aeroplanes with serial numbers before 546.\n\n**What you must do:** Inspect and modify a specific part of the aircraft's frame called \"Hull Frame Station 97\" (a structural support in the fuselage) following the technical instructions in Consolidated Aeronautics Service Letter L44.\n\n**When:** The work had to be completed within 100 hours of flight time after 31 May 1973. For any of these aircraft still registered today, this modification should already have been performed.\n\n**Why it matters:** This addresses a structural weakness in the aircraft's hull frame that could affect airworthiness and safety if left unmodified."}},"importantCases":[],"_links":{"self":"/api/acts/ad-la-4-7-hull-frame-station-97-inspection-and-modification","history":"/api/acts/ad-la-4-7-hull-frame-station-97-inspection-and-modification/history","analysis":"/api/acts/ad-la-4-7-hull-frame-station-97-inspection-and-modification/analysis","conflicts":"/api/acts/ad-la-4-7-hull-frame-station-97-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-la-4-7-hull-frame-station-97-inspection-and-modification/important-cases","documents":"/api/acts/ad-la-4-7-hull-frame-station-97-inspection-and-modification/documents"}}