{"id":"F2006B06193","name":"AD/PHS/16 - Blade Retaining Rings","slug":"ad-phs-16-blade-retaining-rings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47060,"registerId":"commonwealth-F2006B06193-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHS/16 - Blade Retaining Rings","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/16 Blade Retaining Rings 6/94\n\nApplicability: All 14RF-9 and 14RF-21 propellers fitted to Embraer 120 or CASA CN-235 aircraft. Requirement:               Unless previously carried out action in accordance with Hamilton Standard Service\n\nBulletin 14RF-9-61-25 Revision 3 or 14RF-21-61-34 Revision 2, as applicable.\n\nCompliance: At next propeller removal or by 31 December 1994, whichever occurs first. Background:              Advice has been received that during extreme inflight conditions blade separation,\n\ndue to failure of a plastic (Rynite) blade retaining ring, has occurred.\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":2496},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is the original 1994 issuance of the directive. The scope remains tightly focused on the specific safety defect of plastic blade retaining ring failures in the identified propeller models, with no expansion beyond the original technical safety concern."},"complexity_factors":["Single mandatory action referencing external technical standards (manufacturer service bulletins)","Clear, narrow applicability limited to specific aircraft and propeller models","Simple binary compliance deadline (next maintenance event or fixed calendar date)","No nested exceptions, conditional clauses, or extensive defined terms"],"plain_english_summary":"This Airworthiness Directive required operators of Embraer 120 and CASA CN-235 aircraft fitted with Hamilton Standard 14RF-9 or 14RF-21 propellers to carry out mandated repairs/inspections per the manufacturer’s service instructions to replace or correct plastic (Rynite) blade retaining rings. The rings can crack and allow blade separation, risking loss of control; work was due by the next propeller removal or 31 December 1994."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phs-16-blade-retaining-rings","history":"/api/acts/ad-phs-16-blade-retaining-rings/history","analysis":"/api/acts/ad-phs-16-blade-retaining-rings/analysis","conflicts":"/api/acts/ad-phs-16-blade-retaining-rings/conflicts","importantCases":"/api/acts/ad-phs-16-blade-retaining-rings/important-cases","documents":"/api/acts/ad-phs-16-blade-retaining-rings/documents"}}