{"id":"F2006B06200","name":"AD/PHS/6 - Model 23e-50, Barrel Bolt Boss - Modification","slug":"ad-phs-6-model-23e-50-barrel-bolt-boss-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47076,"registerId":"commonwealth-F2006B06200-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHS/6 - Model 23e-50, Barrel Bolt Boss - 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/6 Model 23e-50, Barrel Bolt Boss - Modification NK\n\nApplicability: All model 23E-50 propellers.\n\n \n\nDocument: 1. Hamilton Standard SB No. 122 (Ref. 555); or 2. ANO 107.1.5.3.5.1.\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 \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1470},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive remains tightly focused on its original purpose: addressing a specific airworthiness issue with the barrel bolt boss on model 23E-50 propellers. No expansion of scope is evident."},"complexity_factors":["Extremely short single-purpose directive with no interpretation section","Only one substantive requirement (modification before installation)","External technical references require engineering expertise to interpret but do not complicate the legal obligation"],"plain_english_summary":"**What this does:** This directive mandates a safety modification to a specific type of aircraft propeller before it can legally be installed on any aircraft.\n\n**Who it affects:** Anyone who owns, maintains, or installs Hamilton Standard model 23E-50 variable pitch propellers.\n\n**What must be done:** Before fitting one of these propellers to an aircraft, the \"barrel bolt boss\" (a structural component of the propeller) must be modified according to specific technical instructions set out in Hamilton Standard Service Bulletin No. 122 or Airworthiness Notice 107.1.5.3.5.1.\n\n**Why it matters:** This ensures the propeller meets current safety standards and prevents potential mechanical failures that could endanger the aircraft and passengers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phs-6-model-23e-50-barrel-bolt-boss-modification","history":"/api/acts/ad-phs-6-model-23e-50-barrel-bolt-boss-modification/history","analysis":"/api/acts/ad-phs-6-model-23e-50-barrel-bolt-boss-modification/analysis","conflicts":"/api/acts/ad-phs-6-model-23e-50-barrel-bolt-boss-modification/conflicts","importantCases":"/api/acts/ad-phs-6-model-23e-50-barrel-bolt-boss-modification/important-cases","documents":"/api/acts/ad-phs-6-model-23e-50-barrel-bolt-boss-modification/documents"}}