{"id":"F2006B07239","name":"AD/T53/10 - Inlet Guide Vane Feedback Tube Assembly - Inspection","slug":"ad-t53-10-inlet-guide-vane-feedback-tube-assembly-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49105,"registerId":"commonwealth-F2006B07239-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/T53/10 - Inlet Guide Vane Feedback Tube Assembly - Inspection","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 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  AlliedSignal (Lycoming) Turbine Engines - T53 Series\n\n \n\nAD/T53/10 Inlet Guide Vane Feedback Tube Assembly - Inspection\n\n\n1/86\n\n \n\nApplicability: All T5313A and T5313B engines prior to S/No. LEO7590. All T53-L-13A and T53- L-13B engines prior to S/No. LE23885.\n\n \n\nDocument: 1. Lycoming Field SB No. 0029; or\n\n \n\n2. AD/LYC-T/11.\n\n \n\nCompliance: In accordance with the requirement document.\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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1981},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains a tightly focused scope on a specific mechanical inspection requirement for a defined class of engines. There is no evidence of scope expansion beyond the original safety-critical maintenance purpose."},"complexity_factors":["Extremely brief substantive text (under 80 words)","Narrow applicability limited to four specific engine models with clear serial number cutoffs","Single compliance obligation referencing external technical documents rather than containing detailed instructions","No defined terms, exceptions, or conditional provisions"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by the Civil Aviation Safety Authority. It requires inspection of a specific engine component (the **Inlet Guide Vane Feedback Tube Assembly**) on certain Lycoming T53 turbine engines commonly used in helicopters.\n\n**Who it affects:**\n- Operators of helicopters with T5313A, T5313B, T53-L-13A, or T53-L-13B engines\n- Only applies to engines with serial numbers below LEO7590 (for T5313 models) or LE23885 (for T53-L-13 models)\n\n**What must be done:**\nOperators must inspect the feedback tube assembly following the technical instructions in either:\n- Lycoming Field Service Bulletin No. 0029, or\n- Airworthiness Directive AD/LYC-T/11\n\n**Why it matters:**\nThis prevents potential engine failures or power loss caused by defects in the inlet guide vane system, which controls airflow into the engine compressor."}},"importantCases":[],"_links":{"self":"/api/acts/ad-t53-10-inlet-guide-vane-feedback-tube-assembly-inspection","history":"/api/acts/ad-t53-10-inlet-guide-vane-feedback-tube-assembly-inspection/history","analysis":"/api/acts/ad-t53-10-inlet-guide-vane-feedback-tube-assembly-inspection/analysis","conflicts":"/api/acts/ad-t53-10-inlet-guide-vane-feedback-tube-assembly-inspection/conflicts","importantCases":"/api/acts/ad-t53-10-inlet-guide-vane-feedback-tube-assembly-inspection/important-cases","documents":"/api/acts/ad-t53-10-inlet-guide-vane-feedback-tube-assembly-inspection/documents"}}