{"id":"F2006B06186","name":"AD/PHS/1 - Model 23260 and 43E-60 Low Pitch Stop Assembly - Modification","slug":"ad-phs-1-model-23260-and-43e-60-low-pitch-stop-assembly-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47044,"registerId":"commonwealth-F2006B06186-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHS/1 - Model 23260 and 43E-60 Low Pitch Stop Assembly - 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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Propellers - Variable Pitch - Hamilton Standard\n\n \n\nAD/PHS/1 Model 23260 and 43E-60 Low Pitch Stop Assembly - Modification\n\nApplicability: All model 23260 and 43E-60 propellers. Document:  1. Hamilton Standard SB Nos. 273 and 273A; or\n\n2. ANO 107.1.5.0.1.1; or\n\n \n\n3. FAA AD 54-1-2.\n\n \n\nCompliance: Before installation in an aircraft.\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\n12/65\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The provided text sets a clear, limited scope: all Hamilton Standard model 23260 and 43E-60 propellers must have the low-pitch stop assembly modification performed before installation, implemented by one of the listed documents. The excerpt contains no indication that the scope has been expanded or narrowed from an earlier version; it states the applicability and the compliance requirement directly (\"Applicability\"; \"Document\"; \"Compliance\")."},"complexity_factors":["Narrow applicability: applies only to two specific propeller models (\"Applicability\").","Single clear action: requires a single modification (low-pitch stop assembly) prior to installation (\"Compliance\").","Dependence on external technical documents: compliance details are contained in three referenced documents rather than in the AD itself (\"Document: 1...2...3\").","Technical execution: the modification is technical and likely requires specialised maintenance skills and access to the referenced service information (implied by nature of 'service bulletins' and an FAA AD)."],"plain_english_summary":"This directive mandates that Hamilton Standard variable‑pitch propellers models 23260 and 43E‑60 receive a specified low‑pitch stop assembly modification before they may be installed in any aircraft. Compliance must follow one of the listed documents (Hamilton Standard SBs 273/273A, ANO 107.1.5.0.1.1, or FAA AD 54‑1‑2). Owners, operators, maintenance organisations and installers bear the practical responsibility and cost to ensure the modification is done; the text provides the requirement and approved methods but no safety or cost analysis."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific propeller models. It has not expanded beyond its original purpose of mandating a single modification to prevent propeller overspeed failures."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 specific propeller models affected","Simple binary compliance requirement: modify before installation","Three alternative compliance documents provided (no hierarchy or conditions between them)","No defined terms section","No cross-references to other legislation beyond the three technical documents","No exceptions, exemptions, or conditional logic","Single compliance deadline/event trigger (before installation)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates a specific safety modification for certain aircraft propellers before they can be installed on any aircraft.\n\n**What it covers:**\n- **Which propellers:** All Model 23260 and 43E-60 propellers made by Hamilton Standard (now part of Collins Aerospace)\n- **The problem:** The \"Low Pitch Stop Assembly\" — a component that prevents the propeller blades from flattening out too far (which could cause engine overspeed or loss of control) — needs to be modified\n\n**What must be done:**\nBefore any of these propellers can be put on an aircraft, the modification must be completed according to one of three approved technical documents:\n- Hamilton Standard Service Bulletin No. 273 or 273A (manufacturer's instructions), OR\n- ANO 107.1.5.0.1.1 (an older Australian airworthiness notice), OR  \n- FAA AD 54-1-2 (the equivalent American safety directive)\n\n**Why it matters:**\nThis is a **mandatory safety requirement**. If you don't comply, you cannot legally install or use these propellers. The directive exists because the original Low Pitch Stop Assembly design was found to be unsafe — likely prone to failure or inadequate protection against propeller overspeed, which could lead to catastrophic engine damage or loss of aircraft control.\n\n**Who needs to know:**\n- Aircraft maintenance engineers and organisations\n- Aircraft owners and operators with these propeller models\n- Parts suppliers and distributors"}},"importantCases":[],"_links":{"self":"/api/acts/ad-phs-1-model-23260-and-43e-60-low-pitch-stop-assembly-modification","history":"/api/acts/ad-phs-1-model-23260-and-43e-60-low-pitch-stop-assembly-modification/history","analysis":"/api/acts/ad-phs-1-model-23260-and-43e-60-low-pitch-stop-assembly-modification/analysis","conflicts":"/api/acts/ad-phs-1-model-23260-and-43e-60-low-pitch-stop-assembly-modification/conflicts","importantCases":"/api/acts/ad-phs-1-model-23260-and-43e-60-low-pitch-stop-assembly-modification/important-cases","documents":"/api/acts/ad-phs-1-model-23260-and-43e-60-low-pitch-stop-assembly-modification/documents"}}