{"id":"F2006B10652","name":"AD/HU 269/94 - Main Rotor Pitch Bearing Snap Ring Lockwasher","slug":"ad-hu-269-94-main-rotor-pitch-bearing-snap-ring-lockwasher","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116568,"registerId":"commonwealth-F2006B10652-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/94 - Main Rotor Pitch Bearing Snap Ring Lockwasher","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 269/94 Main Rotor Pitch Bearing Snap Ring Lockwasher 13/89\n\nDM\n\n \n\nApplicability: Model 269C series with serial numbers 1166 through 1336.\n\nRequirement: Unless already accomplished; inspect in accordance with Schweizer SIN No. N-227. Compliance:               Within 50 hours time in service after 8 November 1989 or prior to 31 December\n\n1989, whichever occurs first.\n\n \n\nBackground:  The manufacturer has determined that there may be a possibility that the main rotor pitch bearing snap ring lockwasher (SL61W9F) is missing from the bearing stackup. This condition could result in separation of the main rotor pitch bearing housing assembly and rotor blade.\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":854},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is the original 1989 airworthiness directive maintaining its original narrow scope — a one-time inspection for a specific mechanical defect on specific aircraft serial numbers."},"complexity_factors":["Single specific requirement (visual inspection)","Narrow applicability (limited to specific serial number range of one model)","No defined terms section","Simple alternative compliance deadline (whichever occurs first)","No cross-references to other legislation beyond manufacturer's service bulletin"],"plain_english_summary":"**What this is:** A mandatory safety inspection order (called an Airworthiness Directive) for specific Schweizer (Hughes) 269C helicopters.\n\n**Who it affects:** Owners and operators of Model 269C helicopters with serial numbers 1166 through 1336.\n\n**What it requires:**\n- **Inspect** the main rotor pitch bearing assembly for a missing small metal part called a \"snap ring lockwasher\" (part number SL61W9F)\n- **Use** the manufacturer's inspection procedure outlined in Schweizer Service Information Notice No. N-227\n- **Deadline:** Complete the inspection within 50 flight hours after 8 November 1989, or before 31 December 1989 — whichever comes first\n- **Exception:** Skip this if you've already done the inspection\n\n**Why it matters:** The manufacturer discovered that this tiny lockwasher might be missing from the bearing assembly. If it's missing, the main rotor pitch bearing housing could separate from the rotor blade during flight — which could cause the helicopter to crash."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-94-main-rotor-pitch-bearing-snap-ring-lockwasher","history":"/api/acts/ad-hu-269-94-main-rotor-pitch-bearing-snap-ring-lockwasher/history","analysis":"/api/acts/ad-hu-269-94-main-rotor-pitch-bearing-snap-ring-lockwasher/analysis","conflicts":"/api/acts/ad-hu-269-94-main-rotor-pitch-bearing-snap-ring-lockwasher/conflicts","importantCases":"/api/acts/ad-hu-269-94-main-rotor-pitch-bearing-snap-ring-lockwasher/important-cases","documents":"/api/acts/ad-hu-269-94-main-rotor-pitch-bearing-snap-ring-lockwasher/documents"}}