{"id":"F2006B06212","name":"AD/PHZL/42 Amdt 5 - Propeller Feather Assist Spring Kit","slug":"ad-phzl-42-amdt-5-propeller-feather-assist-spring-kit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47104,"registerId":"commonwealth-F2006B06212-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHZL/42 Amdt 5 - Propeller Feather Assist Spring Kit","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 - Hartzell\n\n \n\nAD/PHZL/42\n\nAmdt 5\n\n\nPropeller Feather Assist Spring Kit 1/86\n\n \n\nApplicability: 1. All model HC-E ( ) Y ( ) -2 ( ) ( ) counterweight propellers.\n\n \n\n2. All model ( ) HC- (*) (2,3) Y ( ) -2 ( ) ( ) counterweight propellers on all model aircraft. (*) except “E” extension.\n\n \n\nRequirement: 1. Hartzell Service Letter No 101.\n\n \n\n2. Hartzell Service Bulletin No 114D.\n\n \n\nCompliance: 1. Before installation in an aircraft following next reconditioning after 30 September 1977.\n\n \n\n2. At next overhaul, recondition or repair necessitating disassembly, whichever is the sooner.\n\n \n\nBackground: This Directive is amended to include the requirement for incorporation of the Feather Assist Spring Kit to the “C” type (compact hub) propellers.\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":1954},"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"This amendment explicitly expands the directive's applicability to include 'C' type (compact hub) propellers, adding new aircraft to the safety mandate beyond the original scope."},"complexity_factors":["Technical model number patterns with wildcard placeholders (e.g., '( )', '(*)') that are difficult to interpret without aviation engineering knowledge","Incorporation by reference of external technical documents (Hartzell Service Letter 101 and Bulletin 114D) which contain the actual installation procedures","Dual compliance deadlines with a 'whichever is sooner' conditional logic","Specialized aviation terminology (feathering, counterweight propellers, reconditioning) requiring domain expertise to understand operational impact"],"plain_english_summary":"This mandatory Airworthiness Directive requires operators of certain Hartzell counterweight propellers — now explicitly including compact-hub \"C\" types — to install a Feather Assist Spring Kit to ensure reliable feathering after engine failure. Without it, a propeller may not feather properly, increasing drag and control/damage risk.\n\nInstall per Hartzell Service Letter No. 101 and Service Bulletin No. 114D, by the earlier of the next reconditioning after 30 Sept 1977 or the next overhaul/repair that disassembles the propeller."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-42-amdt-5-propeller-feather-assist-spring-kit","history":"/api/acts/ad-phzl-42-amdt-5-propeller-feather-assist-spring-kit/history","analysis":"/api/acts/ad-phzl-42-amdt-5-propeller-feather-assist-spring-kit/analysis","conflicts":"/api/acts/ad-phzl-42-amdt-5-propeller-feather-assist-spring-kit/conflicts","importantCases":"/api/acts/ad-phzl-42-amdt-5-propeller-feather-assist-spring-kit/important-cases","documents":"/api/acts/ad-phzl-42-amdt-5-propeller-feather-assist-spring-kit/documents"}}