{"id":"F2006B02103","name":"AD/AC/44 - Engine Tailpipe Assemblies - Inspection and/or Replacement","slug":"ad-ac-44-engine-tailpipe-assemblies-inspection-and-or-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41333,"registerId":"commonwealth-F2006B02103-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/44 - Engine Tailpipe Assemblies - Inspection and/or Replacement","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 10/1970,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Engine Tailpipe Assemblies - Inspection and/or Replacement,44\ntitle: Airworthiness Directive - AD/AC/44 - Engine Tailpipe Assemblies - Inspection and/or Replacement\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)  Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\n \n\nAD/AC/44 Engine Tailpipe Assemblies - Inspection\n\nand/or Replacement\n\nApplicability: Models 680T, 680V and 680N, and model 681, S/Nos. 6001 to 6040. Document:  Aero Commander SB No. 100.\n\nCompliance: Before 1 September 1971.\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\n10/70\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1409},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope, targeting a specific mechanical inspection requirement for a limited subset of aircraft models. No expansion beyond the original safety purpose is evident."},"complexity_factors":["Extremely short length (single requirement)","No interpretation section or defined terms","Simple applicability clause (specific model numbers only)","Single compliance action with clear deadline","No nested conditions or exceptions"],"plain_english_summary":"This Airworthiness Directive is a mandatory safety order requiring owners and operators of specific Twin Commander aircraft to inspect and potentially replace engine tailpipe assemblies.\n\n**Who it affects:** Owners and operators of Twin Commander models 680T, 680V, 680N, and model 681 with serial numbers 6001 to 6040.\n\n**What you must do:** Follow the procedures in **Aero Commander Service Bulletin No. 100** to inspect and/or replace the engine tailpipe assemblies on these aircraft.\n\n**Compliance deadline:** The work must be completed before 1 September 1971.\n\n**Why it matters:** This directive addresses potential safety defects in engine tailpipe assemblies to ensure the aircraft remain airworthy and safe to operate. Airworthiness Directives are legally binding instructions issued under aviation safety regulations to correct unsafe conditions in aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-44-engine-tailpipe-assemblies-inspection-and-or-replacement","history":"/api/acts/ad-ac-44-engine-tailpipe-assemblies-inspection-and-or-replacement/history","analysis":"/api/acts/ad-ac-44-engine-tailpipe-assemblies-inspection-and-or-replacement/analysis","conflicts":"/api/acts/ad-ac-44-engine-tailpipe-assemblies-inspection-and-or-replacement/conflicts","importantCases":"/api/acts/ad-ac-44-engine-tailpipe-assemblies-inspection-and-or-replacement/important-cases","documents":"/api/acts/ad-ac-44-engine-tailpipe-assemblies-inspection-and-or-replacement/documents"}}