{"id":"F2006B11200","name":"AD/LYC/108 - Crankshaft Material Inspection","slug":"ad-lyc-108-crankshaft-material-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56910,"registerId":"commonwealth-F2006B11200-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 CAR 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\nLycoming Piston Engines\n\nAD/LYC/108 Crankshaft Material Inspection 12/2002","sortOrder":0},{"sectionNumber":"DM","sectionType":"part","heading":"DM","content":"# DM\n\nApplicability: 1. Textron Lycoming TIO-540 and LTIO-540 series engines with a rated take-off power of 300 horsepower or greater; and\n\n    2. Textron Lycoming IO-540 series engines modified by a Supplemental Type Certificate (STC) listed in Table 1 of this directive, regardless of the rated horsepower\n\nNote 1: Applicable IO-540 powered aircraft include the Ted Smith/Piper PA-60 601 and 601P models.\n\nNote 2: FAA Airworthiness Directive 2002-19-03 Amdt 39-12883 refers.\n\nRequirement: 1. Textron Lycoming TIO-540 and LTIO-540 series engines with a rated take-off power of 300 horsepower or greater and listed by serial number in Table 2 of this directive:\n\n    A CAR 42ZC (6) authorised representative of Textron Lycoming to obtain a sample of the crankshaft material for the purpose of metallurgical evaluation in accordance with Textron Lycoming Mandatory Service Bulletin (MSB) 553; and\n    Following compliance with Requirement 1a of this Directive; applicable engines may only be returned to service following receipt of Textron Lycoming documented evidence that confirms the material sample was found not to exhibit any metallurgical anomalies; and\n\n    c. The Textron Lycoming notification of the result of the metallurgical evaluation is to be retained in the engine logbook as an engine record.\n\n2. Textron Lycoming TIO-540 and LTIO-540 series engines with a rated take-off power of 300 horsepower or greater and listed by serial number in Table 3 of this directive:\n\nA sample of the crankshaft material is to be taken in accordance with Requirement 1 (a), (b) and (c) of this directive.","sortOrder":1},{"sectionNumber":"AD/LYC/108","sectionType":"part","heading":"AD/LYC/108","content":"# AD/LYC/108\n\nAppendix A\n\n  \nCrankshaft Material Inspection\n\n\\- Tables\n\n  \n12/2002\n\nDM","sortOrder":2}],"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":6,"scope_assessment":{"changed":false,"description":"The directive confines its scope to particular Textron Lycoming TIO‑540 and LTIO‑540 engines ≥300 hp and to IO‑540 engines modified by STCs listed in the directive (Applicability 1–2). It cross-references FAA AD 2002-19-03 but the text shows no explicit expansion beyond those serial-number and STC-based limits. Implementation requires applying the serial-number Tables referenced in the AD; no textual indication here that the scope was broadened beyond the stated applicability."},"complexity_factors":["Applicability limited to specific engine models and to engines listed by serial number in Table 2 and Table 3 — requires checking serial-number lists to determine if an engine is affected (Applicability; Requirement 1 and 2).","Involves engines modified by particular Supplemental Type Certificates (STCs), expanding scope beyond factory production models and requiring cross-check of STC lists (Applicability 2; Note 1).","Sampling and testing must be performed by a CAR 42ZC(6) authorised representative of Textron Lycoming, creating dependency on manufacturer-authorised personnel for execution (Requirement 1a).","Procedural dependence on Textron Lycoming Mandatory Service Bulletin (MSB) 553 means technical steps are governed by manufacturer instructions rather than the AD's text (Requirement 1a).","Return-to-service conditional on receipt of documented evidence that the sample showed no anomalies, creating a hard documentary compliance step and potential grounding until results are received (Requirement 1b, 1c).","Recordkeeping requirement to retain Textron Lycoming’s notification in the engine logbook adds an ongoing administrative compliance burden (Requirement 1c).","Reference to FAA AD 2002-19-03 and cross-jurisdictional materials increases interpretive complexity and may require aligning procedures with external documents (Note 2).","The AD text supplied does not include the actual Tables or the compliance timing text here, producing implementation ambiguity about which serial numbers, exact sampling deadlines, and frequency apply (Tables; compliance timing referenced but not included).","Technical complexity of metallurgical evaluation (laboratory testing, interpretation) raises costs and specialised service requirements for operators (Requirement 1a)."],"plain_english_summary":"This Airworthiness Directive requires metallurgical sampling and inspection of crankshaft material for specified Textron Lycoming engines (certain TIO‑540 and LTIO‑540 engines ≥300 hp, and IO‑540 engines modified by listed STCs). Operators must have an authorised Textron Lycoming representative take samples per the manufacturer’s service bulletin, obtain written confirmation that no metallurgical anomalies were found before returning the engine to service, and retain that notification in the engine logbook. It affects owners/operators and their maintenance providers of the listed engines."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This appears to be the original scope of the directive. The document is a specific safety directive targeting a known metallurgical defect in particular engine models. There is no evidence of scope creep; the applicability is tightly constrained to specific engine series, horsepower ratings, and serial number ranges."},"complexity_factors":["Multiple applicability categories requiring cross-referencing to external tables (Tables 1, 2, and 3 not provided in this extract)","Nested conditional requirements: Requirement 2 incorporates Requirement 1(a), (b), and (c) by reference rather than restating them","Specific regulatory cross-references: subregulation 39.1(1) of CAR 1998 and CAR 42ZC(6)","External document dependencies: Requires compliance with Textron Lycoming Mandatory Service Bulletin 553 and references FAA AD 2002-19-03","Dual-path compliance structure based on serial number listings in separate tables","Logbook retention requirement creates ongoing record-keeping obligation"],"plain_english_summary":"This CASA Airworthiness Directive requires removal and metallurgical testing of a crankshaft sample from certain Lycoming piston engines (TIO‑540 and LTIO‑540 300+ hp, and IO‑540 engines modified by specified STCs), including Ted Smith/Piper PA‑60 601/601P aircraft. A CASA‑authorised Lycoming representative must perform the sampling and testing per Service Bulletin 553, and the engine cannot return to service until documented defect-free results are in the logbook.\n\nIt addresses the risk of catastrophic in‑flight crankshaft failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-lyc-108-crankshaft-material-inspection","history":"/api/acts/ad-lyc-108-crankshaft-material-inspection/history","analysis":"/api/acts/ad-lyc-108-crankshaft-material-inspection/analysis","conflicts":"/api/acts/ad-lyc-108-crankshaft-material-inspection/conflicts","importantCases":"/api/acts/ad-lyc-108-crankshaft-material-inspection/important-cases","documents":"/api/acts/ad-lyc-108-crankshaft-material-inspection/documents"}}