{"id":"F2006B11266","name":"AD/MAKILA/5 - Exhaust Pipe Cracks","slug":"ad-makila-5-exhaust-pipe-cracks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57057,"registerId":"commonwealth-F2006B11266-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/5 Exhaust Pipe Cracks 5/2002","sectionType":"part","heading":"AD/MAKILA/5 Exhaust Pipe Cracks 5/2002","content":"# AD/MAKILA/5 Exhaust Pipe Cracks 5/2002\n\nApplicability: Makila 1A, 1A1 and 1A2 engines incorporating a TU200 modified exhaust pipe. Requirement: In accordance with the applicable Turbomeca Makila Maintenance Manual:\n\n    Inspect the exhaust pipe for cracks, in particular the attachment tabs connecting the ejector to the primary exhaust.\n\n    2. Verify the correct position and attachment of the exhaust pipe.\n\n    3. Verify that the ejector is not in contact with the engine cowling.\n\n    4. Perform a vibration check in transient conditions.\n\nNote: DGAC Airworthiness Directive 2001-301(A) refers.\n\nCompliance: Effective 16 May 2002:\n\n    Following the last flight of the day.\n\n    2. Prior to flight following each installation of an exhaust pipe.\n\n    3. Prior to flight following each installation of an exhaust pipe.\n\n    4. Prior to flight following each installation of an exhaust pipe. This Airworthiness Directive becomes effective on 16 May 2002.\n\nBackground: This Directive has been issued to address reports of cracks in exhaust pipe attachment tabs. Should the cracks result in the exhaust pipe becoming detached, the pipe may collide with the main rotor or the tail rotor.\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 25 March 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 24 April 2002.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive, as written, limits applicability to Makila 1A/1A1/1A2 engines with the TU200 modified exhaust pipe and prescribes inspection actions and timing. The text provides no indication that the scope was expanded or narrowed relative to an earlier intent; it explicitly references the DGAC AD but does not show any deviation from that referenced measure."},"complexity_factors":["Narrow technical applicability: only Makila 1A, 1A1 and 1A2 engines with a TU200 modified exhaust pipe (Applicability).","Multiple discrete inspection actions required (inspect for cracks, verify position/attachment, check ejector contact, perform transient vibration check) rather than a single task (Requirement).","Multiple compliance triggers: after the last flight of the day, and prior to flight following each installation of an exhaust pipe (Compliance).","Reference to an external document for procedural detail: actions must be performed in accordance with the Turbomeca Makila Maintenance Manual (Requirement) — introduces delegated procedural judgment to operators/maintenance personnel.","Operational burden falls on aircraft operators/maintainers who must perform frequent inspections and a transient-condition vibration check; costs are routine maintenance time and possible parts/repairs (Requirement/Compliance).","Safety consequence stated in the background: cracking could lead to pipe detachment and collision with main or tail rotor — explains urgency but does not prescribe repair thresholds or intervals beyond inspection triggers (Background).","Cross-reference to foreign authority: DGAC Airworthiness Directive 2001-301(A) is noted (Note), which may affect interpretation or harmonisation with other directives.","Effective date specified (becomes effective 16 May 2002) which creates immediate compliance timing obligations (Compliance/Effective date)."],"plain_english_summary":"Requires operators of Turbomeca Makila 1A, 1A1 and 1A2 engines fitted with a TU200 modified exhaust pipe to inspect the exhaust pipe (attachment tabs, position and contact with cowling), verify attachment and perform a vibration check, following the Turbomeca Makila Maintenance Manual. Inspections must be done after the last flight of the day and before any flight after installing an exhaust pipe. The measure addresses reported cracks that could allow the pipe to detach and strike the main or tail rotor."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific mechanical defect (exhaust pipe cracks) in specific engine models with a specific modification. There is no evidence of scope creep; the directive remains tightly focused on the unsafe condition identified in the background section."},"complexity_factors":["Very short document (approximately 300 words)","Only 3 defined applicability criteria (specific engine models with TU200 modification)","4 straightforward mechanical inspection requirements with no conditional logic or exceptions","Simple compliance timeline (effective date plus recurring inspections)","No cross-references to other legislation beyond a single note referencing the French aviation authority's equivalent directive","Single background rationale with clear safety justification"],"plain_english_summary":"This CASA safety order requires operators and licensed engineers to perform four safety checks on Turbomeca Makila 1A/1A1/1A2 engines fitted with the TU200 exhaust modification: inspect for cracks in exhaust-ejector attachment tabs, verify pipe positioning and security, ensure the ejector doesn't contact the cowling, and run a vibration check during power changes. \n\nChecks: crack inspection after the last flight daily; the other three before flight each time an exhaust pipe is installed. Effective 16 May 2002."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-makila-5-exhaust-pipe-cracks","history":"/api/acts/ad-makila-5-exhaust-pipe-cracks/history","analysis":"/api/acts/ad-makila-5-exhaust-pipe-cracks/analysis","conflicts":"/api/acts/ad-makila-5-exhaust-pipe-cracks/conflicts","importantCases":"/api/acts/ad-makila-5-exhaust-pipe-cracks/important-cases","documents":"/api/acts/ad-makila-5-exhaust-pipe-cracks/documents"}}