{"id":"F2006B06389","name":"AD/PW200/1 - Low Cycle Fatigue Count","slug":"ad-pw200-1-low-cycle-fatigue-count","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47688,"registerId":"commonwealth-F2006B06389-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nPratt and Whitney Canada Turbine Engines - PW200 Series","sortOrder":0},{"sectionNumber":"AD/PW200/1 Low Cycle Fatigue Count 9/200","sectionType":"part","heading":"AD/PW200/1 Low Cycle Fatigue Count 9/2004 DM","content":"# AD/PW200/1 Low Cycle Fatigue Count 9/2004 DM\n\nApplicability: All Pratt & Whitney Canada (P&WC) PW206B engines that have incorporated Service Bulletin (SB) 28119 or its later revisions;\n\nAll PW206C engines that have incorporated SB 28151 or SB 28165 or their later revisions;\n\nAll PW206E engines;\n\nAll PW207D engines; and All PW207E engines.\n\nNote 1: The above engines are installed on, but not limited to, Augusta 109E, Bell 427, Eurocopter EC135, and MD Explorer helicopters.\n\nRequirement: 1. For installed engines \\- Confirm that the data stored in the Data Collection Unit (DCU) is correct and that data recorded in the engine log books is correct, perform a Comparison Check and a Consistency Check as follows:\n\nComparison Check: Perform a comparison check of the data stored by the DCU as per the Accomplishment Instructions identified in ASB A28252, Revision 2, paragraph 3.C. Interpret the results of the comparison check as per ASB A28252, Revision 2, paragraphs 3.C.9.a. and 3.C.9.b. If necessary, restore the baseline LCF life of components using manual counting as indicated in ASB A28252, Revision 2, paragraph 3.E.\n\nConsistency Check: Perform a consistency check by reviewing the engine log books to confirm the Impeller, CT, and PT disks Low Cycle Fatigue (LCF) counts are correct in accordance with ASB A28252, Revision 2, Accomplishment Instructions, paragraph 3.D. Interpret the results as per paragraphs 3.D.5. and 3.D.6. If necessary, restore the baseline LCF life of components using manual counting as indicated in ASB A28252, Revision 2, paragraph 3.E.\n\n    2. If, during the Requirement 1 checks, any LCF critical component is found\n\nexceeding its published life replace the component.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The AD applies to the engines and service-bulletin configurations listed in the Applicability and mandates checks and replacement consistent with the stated purpose. The text gives no indication it expands scope beyond those listed engines or the referenced ASB; it prescribes corrective actions (checks, manual restore, replacement) rather than extending applicability."},"complexity_factors":["Technical task: low-cycle fatigue counting and interpretation require specialist engineering judgement and access to engine records (Requirement 1; ASB A28252 Rev 2, paras 3.C & 3.D).","Normative references: compliance depends on following a separate service instruction (ASB A28252 Revision 2) and specific paragraphs (3.C, 3.D, 3.E), creating dependency on an external document.","Multiple variants: the AD covers several engine models and engines modified by different service bulletins (Applicability), increasing variation in procedures and parts.","Data access: operators must extract and compare DCU-stored data with log books, requiring tools, trained staff, and possible data-restoration (Requirement 1 Comparison & Consistency Checks).","Manual baseline restore: restoring baseline LCF life by manual counting is time-consuming and technically demanding (ASB A28252 Rev 2, para 3.E).","Replacement obligation: any LCF-critical component exceeding published life must be removed and replaced, creating potential high parts and downtime costs (Requirement 2).","Partial excerpt: the compliance timing/detail (the compliance section) is referenced but not included in the provided text, increasing operational uncertainty."],"plain_english_summary":"This Airworthiness Directive requires operators of the listed Pratt & Whitney PW200-series engines to verify low-cycle fatigue (LCF) counts recorded in the engine Data Collection Unit and engine log books by performing a comparison and consistency check per ASB A28252 Revision 2, and to restore baseline LCF life by manual counting where needed. If any LCF‑critical part is found beyond its published life it must be replaced. The AD is issued under CASR subreg 39.1(1); operators carry the compliance costs (data checks, manual counting, possible part replacements) and must follow ASB paragraphs 3.C, 3.D and 3.E."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific unsafe condition in PW200 series engines related to Low Cycle Fatigue data accuracy. It has not expanded beyond its original safety purpose."},"complexity_factors":["Multiple applicability conditions based on engine model and service bulletin incorporation history","Requires cross-referencing to external technical document (ASB A28252, Revision 2) for detailed procedures","Nested procedural requirements (comparison check → interpretation → potential manual restoration → replacement if exceeded)","Technical aviation terminology requiring specialised knowledge (DCU, LCF, CT/PT disks, impeller)","Conditional logic: 'If necessary' triggers for manual counting, and mandatory replacement trigger for exceeded life limits"],"plain_english_summary":"This CASA Airworthiness Directive requires owners, operators and maintenance organisations of certain Pratt & Whitney Canada PW200-series helicopter engines to verify Low Cycle Fatigue (LCF) life counts for critical rotating parts. It mandates checking data in the engine Data Collection Unit against records and confirming logbook consistency, then recalculating or replacing any component that has exceeded its safe life.\n\nThe AD prevents catastrophic failure by ensuring fatigue-limited parts are retired before unsafe degradation occurs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pw200-1-low-cycle-fatigue-count","history":"/api/acts/ad-pw200-1-low-cycle-fatigue-count/history","analysis":"/api/acts/ad-pw200-1-low-cycle-fatigue-count/analysis","conflicts":"/api/acts/ad-pw200-1-low-cycle-fatigue-count/conflicts","importantCases":"/api/acts/ad-pw200-1-low-cycle-fatigue-count/important-cases","documents":"/api/acts/ad-pw200-1-low-cycle-fatigue-count/documents"}}