{"id":"F2006B10594","name":"AD/HU 269/21 Amdt 3 - Main Rotor Blades - Inspection","slug":"ad-hu-269-21-amdt-3-main-rotor-blades-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116451,"registerId":"commonwealth-F2006B10594-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/21 Amdt 3 - Main Rotor Blades - 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 - 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 269/21\n\nAmdt 3\n\n\nMain Rotor Blades - Inspection 1/78\n\n \n\nApplicability: All models fitted with main rotor blades P/Nos. 269A1125, 269A1131, 269A1131-1, 269B1145, 269B1145-1 and 259B1145-25.\n\n \n\nDocument: Hughes SIN No. N-9.2.\n\n \n\nCompliance: 1. Initial inspection as per requirement document except those blades previously inspected to AD/HU 269/21B.\n\n \n\n2. Recurring inspection as per 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 3 to an existing Airworthiness Directive, but the scope remains tightly focused on its original purpose: inspecting specific main rotor blades on Schweizer 269 helicopters. The amendment appears to refine or update inspection requirements without expanding beyond the original safety-critical purpose of preventing blade failures."},"complexity_factors":["Extremely short document (under 200 words)","Only 6 specific part numbers listed as applicability criteria","Simple two-step compliance structure (initial + recurring)","Single cross-reference to external technical document (Hughes SIN No. N-9.2)","One straightforward exception clause for previously inspected blades","No defined terms section, no nested conditions, no legislative cross-references"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) for Australian-registered aircraft.\n\n**What it does:**\nRequires owners and operators of **Schweizer (Hughes) 269 series helicopters** to inspect specific main rotor blades for defects. These are the large spinning blades that keep the helicopter in the air — if they fail, the aircraft crashes.\n\n**Who it affects:**\nAnyone operating a Schweizer 269 helicopter fitted with particular blade part numbers: 269A1125, 269A1131, 269A1131-1, 269B1145, 269B1145-1, and 259B1145-25.\n\n**What must be done:**\n- **Initial inspection:** Check the blades once according to the technical document \"Hughes SIN No. N-9.2\" (a manufacturer's service instruction)\n- **Recurring inspection:** Repeat these checks periodically on an ongoing basis\n- **Exception:** Blades already inspected under an earlier version of this directive (AD/HU 269/21B) don't need the initial inspection again\n\n**Why it matters:**\nMain rotor blade failures are catastrophic. This directive forces operators to find and fix problems before they cause accidents. Non-compliance grounds the aircraft — it cannot legally fly until the work is done."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The amendment continues to require initial and recurring inspections for specified main rotor blade part numbers while explicitly excluding blades already inspected under AD/HU 269/21B from the initial inspection requirement. The AD delegates technical details (procedures and intervals) to Hughes SIN No. N-9.2, so the operational scope of what must be done is determined by that external document as well as the AD text. (Applicability; Document; Compliance 1–2)"},"complexity_factors":["Narrow technical applicability defined by specific part numbers (requires parts-level checks against aircraft inventories). (Applicability)","Compliance depends on an external manufacturer document (Hughes SIN N-9.2) for technical detail and inspection intervals, so the AD does not stand alone. (Document)","Carve‑out for blades previously inspected under AD/HU 269/21B requires cross-referencing prior compliance history. (Compliance 1)","Recurring inspection obligation is specified but the interval/criteria are not included in the AD text, creating operational dependence on the requirement document. (Compliance 2)","Practical compliance requires maintenance organisation resources: trained personnel, access to the SIN, recordkeeping and possible corrective maintenance (implicit administrative and logistical burden). (Compliance 1–2)"],"plain_english_summary":"This AD requires owners/operators of Schweizer (Hughes) 269-series helicopters fitted with certain main-rotor blade part numbers to perform an initial and recurring inspection per Hughes Service Instruction N‑9.2. It delegates technical procedures and intervals to the manufacturer document, so compliance depends on accessing and following that SIN. The cost and operational impacts (inspections, repairs, downtime) fall to the operators; the measure’s aim is to ensure blade integrity and safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-21-amdt-3-main-rotor-blades-inspection","history":"/api/acts/ad-hu-269-21-amdt-3-main-rotor-blades-inspection/history","analysis":"/api/acts/ad-hu-269-21-amdt-3-main-rotor-blades-inspection/analysis","conflicts":"/api/acts/ad-hu-269-21-amdt-3-main-rotor-blades-inspection/conflicts","importantCases":"/api/acts/ad-hu-269-21-amdt-3-main-rotor-blades-inspection/important-cases","documents":"/api/acts/ad-hu-269-21-amdt-3-main-rotor-blades-inspection/documents"}}