{"id":"F2006B11265","name":"AD/MAKILA/4 - Electronic Control Unit","slug":"ad-makila-4-electronic-control-unit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57055,"registerId":"commonwealth-F2006B11265-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\n![](image.001.png)  \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\nTurbomeca Turbine Engines \\- Makila Series","sortOrder":0},{"sectionNumber":"AD/MAKILA/4 Electronic Control Unit 2/20","sectionType":"part","heading":"AD/MAKILA/4 Electronic Control Unit 2/2002","content":"# AD/MAKILA/4 Electronic Control Unit 2/2002\n\nApplicability: Makila 1A and 1A1 engines, with Electronic Control Unit (ECU) modification TU 203 embodied in accordance with Turbomeca Service Bulletin (SB) 298 73 0146, installed on AS 332 ‘Super Puma’ C, C1, L and L1 helicopters.\n\nRequirement: Modify the ECUs by incorporating Turbomeca Modification TU 215 in accordance with SB 298 73 0166 dated 5 October 2001.\n\nNote: DGAC AD 2001-546(A) refers.\n\nCompliance: Before 30 June 2002.\n\nThis Airworthiness Directive becomes effective on 21 February 2002.\n\nBackground: Analysis of an accident by the Direction Générale de l’Aviation Civile of France revealed that existing failure detection laws may not prevent the power turbine from overspeeding. This Directive, together with AD/MAKILA/3, introduces modifications to the engine ECU designed to correct this deficiency.\n\n![Signature of Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 14 January 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 30 January 2002.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific identified defect in specific engine models. It has not expanded beyond its original purpose of correcting the overspeed detection deficiency."},"complexity_factors":["Single, specific applicability criterion (one engine series with one specific modification)","Single requirement (one specific modification to install)","Single compliance deadline (hard date, no conditional triggers)","No defined terms section — all technical terms reference external manufacturer documents","No nested exceptions or conditional logic","Short document (approximately 250 words)","Cross-references only to external manufacturer documents (Service Bulletin) and related French directive, not to other legislation"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of AS332 Super Puma helicopters fitted with Makila 1A/1A1 engines (with ECU mod TU 203) to install Turbomeca modification TU 215 (per SB 298 73 0166) to prevent a hazardous power turbine overspeed.  \n\nThe fix is mandatory, effective 21 Feb 2002, must be done by 30 June 2002, and aircraft cannot legally fly in Australia without it."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The directive extends previous ECU modification work: it targets Makila 1A/1A1 engines that already have TU 203 and mandates an additional ECU change (TU 215) to alter failure-detection logic and prevent power‑turbine overspeed. This shifts the operational scope from relying on existing detection laws to requiring a specific hardware/software modification (Requirement; Background; Applicability)."},"complexity_factors":["Narrow technical applicability — applies only to Makila 1A and 1A1 engines with ECU mod TU 203 installed on AS 332 C/C1/L/L1 helicopters (Applicability).","Mandated technical work specified by an external Service Bulletin — requires embodiment of Turbomeca Modification TU 215 per SB 298 73 0166 dated 5 October 2001 (Requirement).","Hard compliance deadline — work must be completed before 30 June 2002, creating scheduling and operational time-pressure for operators (Compliance).","Interdependence with prior modifications and other directives — references engines that have TU 203 and cross-references AD/MAKILA/3 and DGAC AD 2001-546(A), increasing coordination needs (Applicability; Note; Background).","Operator bears implementation costs and operational disruption — owners/operators must arrange, fund and perform the ECU modification during maintenance windows (Requirement; Compliance).","Safety‑mechanism change — modification alters ECU failure-detection logic to prevent power-turbine overspeed, a technical change that may require specialized maintenance resources (Background; Requirement)."],"plain_english_summary":"Requires operators of AS 332 “Super Puma” helicopters fitted with Makila 1A/1A1 engines (already modified by TU 203) to upgrade the engine Electronic Control Unit (ECU) by installing Turbomeca Modification TU 215 in accordance with Service Bulletin SB 298 73 0166. \n\nThe change is mandated to address a DGAC finding that existing failure‑detection logic can allow power‑turbine overspeed; compliance was required by 30 June 2002, so affected owners/operators must schedule and pay for the ECU modification."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-makila-4-electronic-control-unit","history":"/api/acts/ad-makila-4-electronic-control-unit/history","analysis":"/api/acts/ad-makila-4-electronic-control-unit/analysis","conflicts":"/api/acts/ad-makila-4-electronic-control-unit/conflicts","importantCases":"/api/acts/ad-makila-4-electronic-control-unit/important-cases","documents":"/api/acts/ad-makila-4-electronic-control-unit/documents"}}