{"id":"F2006B06191","name":"AD/PHS/14 Amdt 2 - Titanium Nitrided Transfer Tube","slug":"ad-phs-14-amdt-2-titanium-nitrided-transfer-tube","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47055,"registerId":"commonwealth-F2006B06191-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHS/14 Amdt 2 - Titanium Nitrided Transfer Tube","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/14\n\nAmdt 2\n\n  \nTitanium Nitrided Transfer Tube 10/93 DM\n\nApplicability: All model 14RF-9, \\-19 and \\-21 and 14SF-5, \\-7, \\-11, \\-15, \\-17, \\-19 and \\-23 propellers and Hamilton Standard-British Aerospace Model 6/5500/F-1 propeller.\n\nNote: Subject propellers may be installed on but not limited to EMB-120 Series, SAAB-340B, ATR42-100, \\-300, \\-320, ATR72-101, \\-201, DHC-8-100, \\-300, \\-314,\n\nCASA CN-235, \\-235-100, Canadair CL215T and BAe ATP aircraft.\n\nRequirement: Unless previously carried out action in accordance with the Technical Requirements of FAA AD 93-06-06 amdt 39-8531 which supersedes FAA AD T91-11-51.\n\nNote: Hamilton Standard ASB 14RF-21-61-A39 applicable to 14RF-21 propellers, ASB 14RF-9-61-A57 applicable to 14RF-9 propellers, ASB 14RF-19-61-A26 applicable to 14RF-19 propellers, ASB 14SF-61-A61 applicable to 14SF series propellers and ASB 6/5500/F-61-A21 applicable to Hamilton Standard-British Aerospace 6/5500/F-1 propellers.\n\nCompliance: As specified in the requirement document with revised effective date of 9 August 1993.\n\nBackground: During investigation of a previously removed quill worn to its wear limits, it was discovered that the quill would not engage with the propeller transfer tube. The previous amendment reduced the allowable wear in the quill, reduced the hours between inspections and detailed terminating action.\n\nThis amendment requires any PCU ballscrew quill, that has either been mated to a titanium nitrided transfer tube or that have no records showing to which transfer tube type the PCU ballscrew quill was mated, must be replaced with a new quill or a quill that has never been mated with a titanium nitrided transfer tube.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment expands scope from earlier measures that reduced allowable quill wear and increased inspection frequency to now require outright replacement of quills mated to titanium‑nitrided transfer tubes or with unknown mating history. This converts a maintenance/inspection regime into a mandatory replacement (Background; Requirement) and increases direct compliance costs and record‑checking obligations for operators."},"complexity_factors":["Applicability covers multiple propeller models and an additional propeller type (Applicability).","Mandates replacement based on mating history or lack of records, creating a records‑verification burden (Requirement; Background).","Relies on an external FAA AD as the technical compliance document (Requirement: FAA AD 93-06-06).","References multiple Hamilton Standard service bulletins for model‑specific actions (Note: ASBs listed).","Imposes a terminating action rather than continued inspection, shifting cost to operators (Background: terminating action).","Revised effective date requirement adds a specific compliance timeline (Compliance: revised effective date of 9 August 1993)."],"plain_english_summary":"This airworthiness directive requires replacement of any PCU ballscrew quill that was mated to a titanium‑nitrided transfer tube, or any quill whose transfer‑tube history is unknown. It applies to specified Hamilton Standard 14RF and 14SF propellers and the Hamilton Standard‑British Aerospace 6/5500/F‑1 commonly fitted to a range of regional aircraft.\n\nOperators must fit a new quill or one never mated to a titanium‑nitrided transfer tube, following FAA AD 93‑06‑06 and the referenced Hamilton Standard service bulletins; operators bear the compliance and cost obligations."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This appears to be a targeted safety amendment within the established scope of airworthiness directives. The amendment tightens requirements for a specific mechanical issue but does not represent scope creep beyond the original purpose of ensuring propeller airworthiness."},"complexity_factors":["Multiple cross-references to FAA directives (AD 93-06-06, T91-11-51) and manufacturer service bulletins (5 different ASB numbers)","Technical aviation terminology requiring specialised knowledge (quills, transfer tubes, PCU ballscrew, titanium nitriding)","Nested applicability covering 10+ propeller models across 8+ aircraft types","Conditional logic: applies to quills with no records OR known mating with titanium nitrided tubes","Amendment structure requires understanding of previous amendments (references 'previous amendment' and 'terminating action' without full context)"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires replacement of Hamilton Standard propeller quills that have ever been mated to titanium‑nitrided transfer tubes — or, if provenance cannot be proven, replacement regardless. It affects operators and maintenance organisations of several regional turboprops fitted with 14RF/14SF and 6/5500/F‑1 propellers.\n\nThe change closes a record‑gap after findings that worn quills can fail to engage these tubes, risking propeller control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phs-14-amdt-2-titanium-nitrided-transfer-tube","history":"/api/acts/ad-phs-14-amdt-2-titanium-nitrided-transfer-tube/history","analysis":"/api/acts/ad-phs-14-amdt-2-titanium-nitrided-transfer-tube/analysis","conflicts":"/api/acts/ad-phs-14-amdt-2-titanium-nitrided-transfer-tube/conflicts","importantCases":"/api/acts/ad-phs-14-amdt-2-titanium-nitrided-transfer-tube/important-cases","documents":"/api/acts/ad-phs-14-amdt-2-titanium-nitrided-transfer-tube/documents"}}