{"id":"F2006B10613","name":"AD/HU 269/51 Amdt 1 - Tail Rotor Control System Pedal Installation - Inspection and Modification","slug":"ad-hu-269-51-amdt-1-tail-rotor-control-system-pedal-installation-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116489,"registerId":"commonwealth-F2006B10613-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/51 Amdt 1 - Tail Rotor Control System Pedal Installation - Inspection and Modification","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 269/51\n\nAmdt 1\n\n\nTail Rotor Control System Pedal Installation - Inspection and Modification\n\n\n1/78\n\n \n\nApplicability: All models.\n\n \n\nDocument: Hughes SIN Co. N-121.1. Compliance:  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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive format consistent with CASA's long-standing regulatory framework for aviation safety. The scope remains precisely targeted: mandatory safety action for a specific aircraft type regarding a specific mechanical system. No scope creep is evident."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section","No conditional logic or nested exceptions","Single cross-reference to external technical document (Hughes SIN Co. N-121.1)","Simple structure: applicability statement + document reference + compliance instruction","No legislative amendments or modification history within the text itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It applies to all **Schweizer (Hughes) 269 series helicopters**.\n\n**What it does:**\n- Requires owners and operators to inspect and modify the **tail rotor control system pedal installation** on these helicopters.\n- The specific technical requirements are found in a separate document: **Hughes Service Information Notice (SIN) Co. N-121.1**.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains Schweizer (Hughes) 269 helicopters in Australia.\n\n**Why it matters:**\n- Airworthiness Directives are legally binding safety orders. They are issued when a safety defect or unsafe condition is discovered in an aircraft type. Compliance is mandatory — you cannot legally fly the aircraft until the required inspection or modification is completed.\n- This particular directive addresses potential issues with the tail rotor pedals, which are critical for controlling the helicopter's yaw (directional control). A failure here could lead to loss of control.\n\n**Key point:** The directive itself doesn't contain the detailed instructions — it simply mandates that operators must follow the technical document referenced (Hughes SIN Co. N-121.1)."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This instrument is labeled as Amendment 1 (Amdt 1), indicating it modifies a prior AD. The supplied text does not specify the previous scope or the exact changes introduced by Amendment 1. To determine how the scope has changed from the prior directive, one must compare this amendment with the original AD text and review Hughes SIN Co. N-121.1 for any new or altered technical requirements."},"complexity_factors":["References an external requirement document (Hughes SIN Co. N-121.1) for procedural detail rather than including procedures in the AD itself, increasing the practical complexity of compliance.","Applies to all models of the HU 269 series, so operators across the fleet must assess applicability and compliance status.","Is an amendment (Amdt 1) to an existing AD, requiring comparison with prior versions to determine what changed.","AD text supplied lacks specific timeframes, inspection intervals, or exemption details, necessitating consultation of the referenced document and possibly regulator guidance.","Compliance may require parts, specialised labour, or grounding of aircraft, introducing logistical and operational coordination complexity."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of all Schweizer (Hughes) HU 269 series helicopters to inspect—and, if necessary, modify—the tail-rotor control system pedal installation, with compliance to the manufacturer’s Hughes Service Instruction N-121.1. \n\nIt matters because the AD imposes a regulatory maintenance obligation that may ground aircraft, incur labour and parts costs, and fall to maintenance organisations to perform per the referenced document."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-51-amdt-1-tail-rotor-control-system-pedal-installation-inspection-and-modification","history":"/api/acts/ad-hu-269-51-amdt-1-tail-rotor-control-system-pedal-installation-inspection-and-modification/history","analysis":"/api/acts/ad-hu-269-51-amdt-1-tail-rotor-control-system-pedal-installation-inspection-and-modification/analysis","conflicts":"/api/acts/ad-hu-269-51-amdt-1-tail-rotor-control-system-pedal-installation-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-hu-269-51-amdt-1-tail-rotor-control-system-pedal-installation-inspection-and-modification/important-cases","documents":"/api/acts/ad-hu-269-51-amdt-1-tail-rotor-control-system-pedal-installation-inspection-and-modification/documents"}}