{"id":"F2006B10602","name":"AD/HU 269/33 - Main Rotor Mast - Inspection for Internal Corrosion","slug":"ad-hu-269-33-main-rotor-mast-inspection-for-internal-corrosion","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116467,"registerId":"commonwealth-F2006B10602-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/33 - Main Rotor Mast - Inspection for Internal 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)  Schweizer (Hughes) 269 Series Helicopters\n\n \n\nAD/HU 269/33 Main Rotor Mast - Inspection for Internal Corrosion\n\n\n5/70\n\n \n\nApplicability: All models. Document: Hughes SIN No. N-74.\n\nCompliance: Within 300 hours time in service after 29 May 1970.\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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1585},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive remains narrowly focused on its original purpose: requiring a specific one-time inspection for internal corrosion of main rotor masts on Schweizer (Hughes) 269 helicopters. It has not expanded beyond this targeted safety measure."},"complexity_factors":["Single, unambiguous safety requirement","No defined terms or interpretation section","Minimal cross-referencing (only to one specific service document)","Clear applicability with no exceptions or conditions"],"plain_english_summary":"This Airworthiness Directive (AD) mandates a safety inspection for **Schweizer (Hughes) 269 series helicopters**.\n\n**Who is affected:** Owners and operators of all models in the Schweizer (Hughes) 269 helicopter series.\n\n**What you must do:** Inspect the main rotor mast (the central shaft that connects the rotor blades to the helicopter) for internal corrosion. You must follow the specific inspection procedures detailed in **Hughes Service Information Notice (SIN) No. N-74**.\n\n**When:** Complete this inspection within **300 hours of flight time** after 29 May 1970.\n\n**Why it matters:** Internal corrosion can weaken the rotor mast without visible external signs. Since the mast holds the rotor blades, any failure could cause the helicopter to crash. This is a mandatory safety requirement issued under the Civil Aviation Regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-33-main-rotor-mast-inspection-for-internal-corrosion","history":"/api/acts/ad-hu-269-33-main-rotor-mast-inspection-for-internal-corrosion/history","analysis":"/api/acts/ad-hu-269-33-main-rotor-mast-inspection-for-internal-corrosion/analysis","conflicts":"/api/acts/ad-hu-269-33-main-rotor-mast-inspection-for-internal-corrosion/conflicts","importantCases":"/api/acts/ad-hu-269-33-main-rotor-mast-inspection-for-internal-corrosion/important-cases","documents":"/api/acts/ad-hu-269-33-main-rotor-mast-inspection-for-internal-corrosion/documents"}}