{"id":"F2006B11262","name":"AD/M601/2 - Combustion Chamber Inner Liner","slug":"ad-m601-2-combustion-chamber-inner-liner","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57048,"registerId":"commonwealth-F2006B11262-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\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\nWalter Turbine Engines \\- M601 Series","sortOrder":0},{"sectionNumber":"AD/M601/2 Combustion Chamber Inner Liner","sectionType":"part","heading":"AD/M601/2 Combustion Chamber Inner Liner 7/2003","content":"# AD/M601/2 Combustion Chamber Inner Liner 7/2003\n\nApplicability: Walter M601 series engines as listed in Appendix 1 of Walter a.s Service Bulletins (S/B) A M601D/33a, A M601D-1/7a, A M601D-11NZ/7a, A M601E/29a, A M601E-\n\n21/7a.\n\nRequirement: Replace the engine combustion chamber inner liner part number M601-264.7 in accordance with Walter a.s Service Bulletins (S/B) A M601D/33a, A M601D-1/7a, A M601D-11NZ/7a, A M601E/29a, A M601E-21/7a.\n\nNote: Czech AD CAA-AD-T-031/2003 refers.\n\nCompliance: Prior to 31 December 2003.\n\nThis Airworthiness Directive becomes effective on 10 July 2003.\n\nBackground: During manufacture certain welding procedures were not adhered to. This could lead to failure of the liner.\n\n![Signature of Jim Coyne Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nJim Coyne\n\nDelegate of the Civil Aviation Safety Authority 28 May 2003\n\n![](image.001.png)","sortOrder":1}],"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific manufacturing defect in specific engine models. The scope remains precisely limited to the identified unsafe condition and affected products, with no expansion beyond the original safety purpose."},"complexity_factors":["Single, unambiguous requirement (replace one specific part)","Only 4 defined elements: applicability (engine models), requirement (replacement action), compliance deadline, and background (manufacturing defect)","No nested conditions or exceptions","No cross-references to other legislation beyond a single note referencing a Czech aviation authority directive","Total length: approximately 250 words","Straightforward temporal compliance (single hard deadline)"],"plain_english_summary":"This is a **safety order for aircraft engines**. The Civil Aviation Safety Authority (CASA) has discovered a manufacturing defect in certain Walter M601 turbine engines — specifically, faulty welding in the combustion chamber inner liner (a critical part that contains the burning fuel inside the engine). If this liner fails, it could cause catastrophic engine damage or failure.\n\n**Who it affects:** Owners and operators of specific Walter M601 series engines, commonly used in small turboprop aircraft.\n\n**What they must do:** Replace the defective combustion chamber inner liner with a corrected part, following the manufacturer's service instructions.\n\n**When:** Before 31 December 2003.\n\n**Why it matters:** This is an emergency safety measure. The welding defect creates an \"unsafe condition\" that could lead to engine failure in flight, endangering passengers and crew."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive’s scope matches its stated purpose: it mandates replacement of combustion chamber inner liner part M601-264.7 on the listed Walter M601 series engines per the referenced service bulletins. It does not expand obligations beyond that part-specific replacement and the stated compliance deadline."},"complexity_factors":["Narrow technical scope: single part-numbered replacement (part M601-264.7) tied to specific Walter M601 engines (Applicability & Requirement).","Cross-references multiple Walter a.s service bulletins, creating dependency on manufacturer instructions and possible variations between bulletins (Requirement).","Fixed compliance deadline — must be completed prior to 31 December 2003 — compresses scheduling and parts procurement for operators (Compliance).","Safety justification rests on a manufacturing welding non‑conformance (Background), which leaves little room for alternative mitigations beyond replacement.","Costs and operational downtime fall on operators/owners who must procure and install the liner; administrative enforcement rests with the CASA delegate (Authority declaration).","International coordination implied by reference to Czech AD (Note) — may affect documentation and acceptance of compliance actions across jurisdictions."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Walter M601 turboprop engines to replace the combustion chamber inner liner (part M601-264.7) in accordance with Walter a.s service bulletins. CASA’s delegate says certain welding procedures were not followed in manufacture, creating a risk of liner failure.\n\nOperators must pay for and schedule the replacement, comply before 31 December 2003, and follow the manufacturer’s instructions; the directive is issued under CASA’s regulatory authority and is binding on affected engine owners."}},"importantCases":[],"_links":{"self":"/api/acts/ad-m601-2-combustion-chamber-inner-liner","history":"/api/acts/ad-m601-2-combustion-chamber-inner-liner/history","analysis":"/api/acts/ad-m601-2-combustion-chamber-inner-liner/analysis","conflicts":"/api/acts/ad-m601-2-combustion-chamber-inner-liner/conflicts","importantCases":"/api/acts/ad-m601-2-combustion-chamber-inner-liner/important-cases","documents":"/api/acts/ad-m601-2-combustion-chamber-inner-liner/documents"}}