{"id":"F2006B10616","name":"AD/HU 269/54 - Collective Pitch Throttle Gear - Inspection and Replacement","slug":"ad-hu-269-54-collective-pitch-throttle-gear-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116495,"registerId":"commonwealth-F2006B10616-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/54 - Collective Pitch Throttle Gear - Inspection and Replacement","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 269/54 Collective Pitch Throttle\n\nGear - Inspection and Replacement\n\nApplicability: Models 269A and 269B. Document:  1. Hughes SIN N-131.\n\n2. FAA AD 75-15-02.\n\n \n\nCompliance: Within 100 hours time in service after 31 July 1976.\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\n4/76\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"No change to scope is evident in the source text. The directive applies specifically to Schweizer (Hughes) Models 269A and 269B and mandates inspection and replacement of the collective pitch throttle gear within 100 hours time in service after 31 July 1976, referencing Hughes SIN N-131 and FAA AD 75-15-02 for technical procedures (Applicability; Document; Compliance)."},"complexity_factors":["Narrow applicability limited to two specific helicopter models (Applicability: Models 269A and 269B).","Single, short compliance window (100 hours after 31 July 1976) simplifies scheduling but requires precise flight-hour tracking (Compliance: Within 100 hours time in service after 31 July 1976).","Procedural detail delegated to external technical documents (Hughes SIN N-131; FAA AD 75-15-02), requiring access to and reliance on those sources (Document: 1. Hughes SIN N-131. 2. FAA AD 75-15-02).","Technical nature of mandated work (inspection and possible replacement of mechanical gear) requires qualified maintenance personnel and parts, raising logistical and cost factors.","Historical dating (1976 compliance start) may affect availability of parts and records, introducing practical implementation risks."],"plain_english_summary":"This AD requires owners/operators of Schweizer (Hughes) Model 269A and 269B helicopters to inspect—and, if necessary, replace—the collective pitch throttle gear within 100 hours time-in-service after 31 July 1976, following procedures in Hughes SIN N-131 and FAA AD 75-15-02. It mitigates a identified airworthiness/safety risk and imposes inspection, parts and downtime costs on operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive from 1976 with a narrow, specific purpose. It has not expanded beyond its original scope of addressing a known mechanical defect in specific helicopter models."},"complexity_factors":["Very short document (approximately 200 words)","No defined terms section — uses standard aviation terminology","Single, clear compliance requirement with one condition (100 hours time in service)","No nested exceptions or conditional logic","Simple cross-reference to two external technical documents (Hughes SIN and FAA AD)","Straightforward applicability clause limited to two specific helicopter models"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for specific helicopter models.\n\n**What it does:**\n- Requires owners and operators of **Schweizer (formerly Hughes) 269A and 269B helicopters** to inspect and replace the **collective pitch throttle gear** — a component that controls engine power in relation to rotor blade pitch.\n\n**Who it affects:**\n- Owners, operators, and maintenance organisations responsible for Hughes/Schweizer 269A and 269B helicopters.\n\n**Why it matters:**\n- This directive addresses a safety-critical component. Failure of the collective pitch throttle gear could lead to loss of engine power control, potentially resulting in catastrophic failure or crash. The directive mandates action within **100 hours of flight time** after 31 July 1976 to prevent accidents.\n\n**Key requirements:**\n- **Compliance deadline:** Within 100 hours \"time in service\" (actual flying hours, not calendar time) after 31 July 1976\n- **Reference documents:** Follows guidance from Hughes Service Information Notice N-131 and the US Federal Aviation Administration's AD 75-15-02\n- **Effective date:** April 1976 (noted as \"4/76\")"}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-54-collective-pitch-throttle-gear-inspection-and-replacement","history":"/api/acts/ad-hu-269-54-collective-pitch-throttle-gear-inspection-and-replacement/history","analysis":"/api/acts/ad-hu-269-54-collective-pitch-throttle-gear-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-hu-269-54-collective-pitch-throttle-gear-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-hu-269-54-collective-pitch-throttle-gear-inspection-and-replacement/important-cases","documents":"/api/acts/ad-hu-269-54-collective-pitch-throttle-gear-inspection-and-replacement/documents"}}