{"id":"F2006B06197","name":"AD/PHS/22 - Propeller Control System Components","slug":"ad-phs-22-propeller-control-system-components","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47069,"registerId":"commonwealth-F2006B06197-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHS/22 - Propeller Control System Components","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPropellers \\- Variable Pitch \\- Hamilton Standard\n\nAD/PHS/22 Propeller Control System Components 7/97\n\nApplicability: All 14-RF-9, \\-19, \\-21, 14-SF-5, \\-7, \\-11, \\-11L, \\-15, \\-17, \\-19, \\-23 and 6/5500/F\n\npropellers.\n\nNote: These propellers may be installed on, but are not limited to, Embraer EMB- 120, -120RT, SAAB SF340B, Aerospatiale ATR42-100, -300, -320, ATR72,\n\nDeHavilland DHC8-100, 200, \\-300, CASA CN235 series, Canadair CL-215T, CL-415 and BAe ATP series aircraft.\n\nRequirement: 1. Inspect transfer tube assemblies and propeller control units (PCU) for wear in accordance with the applicable manufacturer’s service bulletins as listed in paragraphs (c) and (g) of FAA AD 96-25-20 Amdt 39-9863.\n\n2. Inspect actuator assemblies for wear in accordance with the applicable manufacturer’s service bulletins as listed in paragraphs (c) and (g) of FAA AD 96- 25-20 Amdt 39-9863.\n\nCompliance: 1. Unless previously carried out, inspect transfer tube assemblies and PCU assemblies within 6000 hours or 3 years time in service (TIS), whichever occurs first, from the effective date of this Directive. Thereafter, re-inspect at intervals not exceeding 10,500 hours TIS from last inspection.\n\nNote: PCU’s that have been fitted with a secondary drive quill (SDQ) in accordance AD/PHS/15 Amdt 5 do not require the initial 6000 hour inspection.\n\n2. Unless previously carried out, inspect actuator assemblies for wear prior to 10,500 hours TIS after the effective date of this Directive, or at the next propeller shop visit where affected parts are accessible, whichever occurs first. Thereafter, re- inspect at intervals not exceeding 10,500 hours TIS since last inspection.\n\nThis Airworthiness Directive becomes effective on 19 June 1997.\n\nBackground: The propeller manufacturer has introduce mandatory inspection intervals for all critical components within the propeller assembly. This Directive being raised to mandate compliance with the manufacturers requirements.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The Directive converts the propeller manufacturer's inspection intervals into a mandatory regulatory requirement covering the listed propeller models and their installations (Background; Applicability; Requirement). Operators and maintenance organisations are therefore legally obliged to perform and fund the inspections on the schedule set out in the Directive (Compliance)."},"complexity_factors":["Broad range of affected propeller models and example aircraft installations creates wide operational applicability (Applicability).","Procedures and affected parts are defined by cross‑reference to manufacturer service bulletins and FAA AD 96‑25‑20 rather than spelled out in the Directive itself, requiring users to consult external documents (Requirement).","Staggered timing rules: initial PCU/transfer tube inspection at 6,000 hours or 3 years, actuator inspection by 10,500 hours or next shop visit, and recurring inspections at 10,500‑hour intervals—multiple temporal metrics to track (Compliance).","Limited exception for PCUs fitted with a secondary drive quill under AD/PHS/15 Amdt 5 adds an eligibility test for exemption (Compliance: Note).","Operational burden: inspections may require propeller removal or shop access and technical maintenance resources, shifting costs and scheduling onto operators (Compliance).","Legal immediacy from an explicit effective date creates an enforceable compliance deadline (Compliance; Background)."],"plain_english_summary":"This Airworthiness Directive obliges operators of the listed Hamilton Standard variable‑pitch propellers to inspect transfer tubes, propeller control units (PCUs) and actuators for wear, following the manufacturer’s service bulletins and FAA AD 96‑25‑20 (Requirement; Applicability). It sets mandatory initial and recurring inspection intervals (hours/years), includes a limited exemption for PCUs fitted with a secondary drive quill, and places the compliance and cost burden on aircraft operators and maintenance organisations (Compliance; Note; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive implementing manufacturer-mandated safety inspections. The scope remains tightly focused on the original purpose: ensuring wear inspections of specific propeller control components. No scope creep is evident."},"complexity_factors":["Short, single-purpose document focused on one specific maintenance requirement","Only 7 defined component references (propeller models and aircraft types)","Clear, sequential compliance requirements with specific hour/time thresholds","Single exception clause (for PCUs with secondary drive quill modification)","Minimal cross-referencing — only refers to one FAA AD (96-25-20) for technical procedures","No nested conditions or complex logical structures"],"plain_english_summary":"This AD mandates inspections of specified Hamilton Standard variable-pitch propeller components (transfer tube assemblies, propeller control units, and actuator assemblies) on a range of regional aircraft types. Affected operators must perform initial and recurring inspections at set flight-hour intervals (with one exception for PCUs already modified), to catch wear that could lead to propeller failure. It makes the manufacturer’s safety requirement legally compulsory in Australia."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phs-22-propeller-control-system-components","history":"/api/acts/ad-phs-22-propeller-control-system-components/history","analysis":"/api/acts/ad-phs-22-propeller-control-system-components/analysis","conflicts":"/api/acts/ad-phs-22-propeller-control-system-components/conflicts","importantCases":"/api/acts/ad-phs-22-propeller-control-system-components/important-cases","documents":"/api/acts/ad-phs-22-propeller-control-system-components/documents"}}